The method of receiving multi-beam broadband signal and device for its implementation

 

The group of inventions relates to the field of radio engineering and can be used in the receiving device, for example, in the communication system with code division multiplexing. The invention allows to compensate for the interfering influence of information flow signals rays that are used for other subscriber stations; to consider the impact on the received signal of the communication channel, devices, transmission and reception and to avoid significant errors in the estimation of the mutual influence of the signals of information flows of signals rays on each other due to the smoothing of the generated estimates of the signal of each information stream of each beam, to reduce the implementation complexity due to the use of subtracting the estimates of the interfering influence on the information symbol stream; significantly improve the estimation accuracy of the information symbols of the data streams. The technical result is to increase noise immunity and quality of received data in a communication system. 2 S. and 9 C.p. f-crystals, 7 Il.

The group of inventions relates to the field of radio engineering, in particular to a method of receiving multi-beam broadband signal in the communication system and device for its implementation, and can be ispolzovaniem mobile channels signal propagation between the transmitter and receiver data are multipath and non-stationary (fedorowski).

Megalocephaly occurs in natural conditions, in the reflection of the transmitted signal from the roughness of the landscape (the ravines, hills, mountains, and so on), and in communities - from buildings, vehicles and other man-made structures.

The effectiveness of radio communication systems is largely determined by their ability to provide in nonstationary multipath channels necessary quality and speed of information transfer.

In modern mobile communication systems, for example, 3GPP2 [1] Physical Layer Standard for cdma 2000 Spread Spectrum Systems, July 13, 2001], HDR [2] HDR Air Interface Specification (HAI), X4 Revision, January 28, 2000, IS95-B [3] Mobile Station-Base Station Compatibility Standard for Dual-Mode Spread Spectrum Systems, Default, Ballot Version, July 17, 1998, an information signal transmitted to subscriber stations, contains several mutually orthogonal information flows. The information flows in this case means the streams of information symbols of the wideband signal. This approach in General can improve the data rate and improve the quality of communication. Mutual orthogonality in the information flow is ensured by the properties of the code sequences used in each information flow.

In one of the radio channels, the orthogonality condition p is of the demodulation of each information flow is deteriorating almost from the availability of other information streams.

In real multipath channels radio correlation between the temporary provisions of the signal beams random, unknown in advance. Therefore, the flow signals of different rays are not strictly orthogonal, therefore have a disturbing influence on each other. The absence of strict orthogonality causes along with the noise component interference (interfering effect of signals of the beams to each other), for example, for a CDMA radio system - multitool interference. This leads to decreased immunity receiving information flows broadband signal. The most sensitive to the presence of mutual interference are relatively more complex modulation schemes with a large alphabet size. The power of interference increases with the number of information flows. For example, at approximately the same power of the signal beams, the interference power can be close to the power of the useful signal. In this case, the reception quality may be poor even at low noise level.

So in a real multipath channels for all of the above-mentioned mobile communication systems[1], [2], [3] this issue is relevant.

Currently known technical is the al radio.

There is a method of receiving signals in a communication system with code division multiplexing and compensation impacts, described in the patent [4] US Patent 5872776: Lin Yang Land: Signal detection and interference cancellation based on simplified matrix inversion for CDMA applications. Feb. 16, 1999, Int. Cl.6H 04 1/69, H 04 J 13/00. The essence of this method lies in the use of matrix inversion cross-correlation, which is calculated on the basis of the known expanding pseudo-random sequences (SRP) based on the known phases of the received signals of each user. To reduce computational costs, a simpler method for computing the inverse of a matrix-based representation of its sum of two matrices is diagonal and off-diagonal.

Method [4] has the following major drawbacks. Algorithms for the inversion of the matrix of cross-correlations computationally expensive when a large number of information flows of signals, which determines the dimension of the matrix of cross-correlations. Additional challenges with cases of poor conditioning of the matrix of cross-correlations. In addition, the above method does not take into account megalocephaly distribution of signals, and the calculation of the interfering signals of the users on each other, the imp is in the process of transmission and reception.

Know another solution, described in [5] US Patent 2 6014373: Schilling, et al. : Spread spectrum CDMA interference canceller system. January 11, 2000, Int. Cl.7H 04 1/707. This solution consist in the gradual assessment of the interfering effect of signals of the beams at each other and its correction. Adjusted evaluation of the interfering effect of signals of the beams to each other is subtracted from the input signal. Phased evaluation of the interfering effect of signals of the beams to each other is implemented in this solution using a standard iterative procedure of noise reduction, which is described in detail in [6] M. Varanasi, Aazhang Century Multistage detection in Asynchronous Code - Division Multiple - Access Communications // IEEE Transactions on Communications. April 1990. - Vl.38 - 4 - P 509-519.

You know the invention [7] US Patent 3 5553062: Schilling, et al.: Spread spectrum CDMA interference canceller system and method. Sept. 3, 1996, Int. Cl.6H 04 1/707, in which similarly to the previous technical solution is proposed in phases to estimate the interfering effect of signals of rays at each other, correct it and adjusted the estimate of the interfering effect of signals of rays on each other to subtract from the input signal of the receiver.

Lack of invention [5] , [7], based on the regeneration of the interfering effect of signals of the beams at each other and its subtraction from the input signal, is the sustained fashion costs can be obtained by compensation of the interfering effect of signals of the beams at each other after demodulation.

Known technical solution according to the patent [8] US Patent 5432754: Brady, et. al. : Receiver for receiving a plurality of asynchronously transmitted signals. Jul. 11, 1995, Int. Cl.6H 04 11/00, which describes a method asynchronously transmitted signals in underwater communication system with code division multiplexing. Although this solution does not relate directly to themes of the cellular radio communication systems, the described method is of particular interest, as does the evaluation and compensation of the interfering effect of signals of several users on each other using the evaluation matrix cross-correlation after demodulation. As noted in the book [9] had Soured j. Digital communication, ed. Radio and Communications, 2000, page 414, the signal after demodulation is called soft decision.

The compensation of the interfering effect in the technical solution [8] is carried out iteratively with successive refinement of the estimates of the interfering effect of signals of the users on each other.

This method has the following disadvantages. Evaluation matrix cross-correlation is performed on the basis scramblers SRP code channels excluding filtering of the received signal, which leads to significant errors in the estimation of the mutual influence of signals polzovatelya.nachinaem solution is a way of reception of multipath signals and device for its implementation described in the patent [10] US 6201799 B1: Horward S. , Huand, Chlh-Lin: Partial decorrelation for a coherent using a code division multiple access receiver. Mar. 13, 2001, EP 0876001 A2, 21.04.1998, Int. Cl.6H 04 1/707).

The way of reception of multipath signals is as follows: search signal rays; form an estimate of the complex envelope of pilot symbols detected signals rays, calculating the correlation of the detected signals rays with the SRP pilot signal beams corresponding to the temporary position of the pilot symbol signal rays; form an estimate of the complex envelope of information symbols of the detected signals of the beams formed by the estimates of complex envelopes of pilot symbols detected signals rays; form evaluation of the pilot signals of the detected light; generate signals rays, purified from the interfering influence of pilot signals from other rays, subtracting from the signal of each beam evaluation of the pilot signals of all other rays; form of the correlation responses of information symbols J flows of each beam, calculating the correlation of the signal beam, free from the interfering influence of pilot signals from other rays, with a SRP of information symbols corresponding threads of the signal beam; form soft decision information symbols J flows of each beam, Pern evaluation of complex envelopes of the respective information symbols signal beam; form a combined soft-decision information symbols of each of the J streams, summing over all rays of soft decisions corresponding information symbols signal-flow-rays; forming a correlation matrix of information symbols J flows of all rays, consisting of corresponding to each beam of Podiatric, with elements of each of the pieces and uses represent the correlation of the signal beam, free from the interfering influence of pilot signals from other rays, with a SRP of information symbols signal streams beam;
form a combined correlation matrix for information symbols J flows by summing the product of Podiatric rays in the evaluation of complex envelopes of information symbols rays,
form a matrix, inverse of the joint correlation matrix;
form soft decision information symbols J threads purged from interfering effect of signals of rays at each other, performing a partial decorrelation by multiplying the combined soft decision information symbols J flows in a matrix, inverse of the joint correlation matrix.

The device on which the prototype method is shown in Fig.1. The device is a prototype Inesta (gpsa) 3, L vychitala the interfering influence of the pilot signal beam 41-4LL blocks of data of the signal beam 51-5LL blocks evaluation of the pilot signal beam 61-6Lthe driver interfering influence of pilot signals rays 7, the control unit 8, J blocks combining soft decisions flow 91-9J; and block with decorrelation of data streams 10, with the first inputs of the receiver for signals rays 1 and the selector signal beams 2 are combined, forming the input of the second input receiver for signals rays 1 and the selector signal beams 2 are connected respectively with the first and second outputs of the control unit 8, the third receiver input search signal beams 1, the first inputs of L blocks of data of the signal beam 51-5Lthe first inputs units estimates the pilot signal beam 61-6Land the first input of the block of decorrelation of data streams 10 is connected to the output of the gpsa 3, an input connected to the third output of the control unit 8, an input connected to the output of the receiver for signals rays 1, each of the L outputs of the selector signal beams 2 connected to the first input of the corresponding vicites the interfering influence of the pilot signal beam (respectively 41-4L), the second inputs L bicigo impact of the pilot signals of the beams 7, the output of each of the L vicites the interfering influence of the pilot signal beam 41-4Lconnected with the second input of the corresponding data processing unit of the signal beam 51-5Lthe first outputs of the processing units of the data signal beam 51-5Lconnected with the inputs of the J blocks combining soft decisions flow 91-9Jthe outputs are connected with the second inputs of the block of decorrelation of data streams 10, the second output of each of the L blocks of data of the signal beam 51-5Lconnected with the second input sootvetstvuyuschego him of the evaluation unit, the pilot-signal beam (respectively 61-6Land the third input unit of decorrelation of data streams, the outputs of the L blocks evaluation of the pilot signal beam 61-6Lconnected with the first inputs of the former (the interfering influence of pilot signals rays 7, a second input connected to the fourth output of the control unit 8, the fifth output of which is connected to the fourth input of the unit of decorrelation of data streams 10 whose outputs are the outputs of the device.

The method of receiving multi-beam broadband signal is carried out on the prototype device (Fig.1) as follows.

Preliminarily it should be noted that the standard operahouse signal is made. The complex amplitude of the signal in the radio channel remains constant during one symbol interval, but in General varies from symbol to symbol. Processing of the received digital multibeam signal is performed character by character. The signal of each beam contains a pilot signal and an information signal consisting of J independent streams of information symbols.

The input digital multi-beam signal is supplied to the first inputs of the receiver for signals rays 1 and the first input of the selector signals rays 2.

The pseudo-random sequence generator (gpsa) 3 on the control signal received at its input from the third output of the control unit 8 generates copies of the SRP pilot signal. Output gpsa 3 copies of the SRP pilot signal received at the third receiver input search signal beams 1.

To the second input of the receiver for signals rays 1 from the first output control unit 8 receives a control signal search. On this signal the receiver for signals rays 1 scans the time interval, determines the pilot-signal temporal position of the signal beams and transmits them to the control unit 8.

The control unit 8 estimated temporary provisions found signal is of 8 go respectively to the second input of the selector signals rays 2, input gpsa 3, to the second input of the shaper interfering influence of pilot signals of the beams 7 and the fourth input of the unit of decorrelation of data streams 10.

Gpsa 3 according to the control signal received at its input from the third output unit 8 generates a copy of the SRP pilot signal L is detected rays and copies of the SRP J information flows. A copy of the SRP pilot signal beams are fed to respective first inputs of the processing units of the data signal beam 51-5Land the corresponding first inputs units estimates the pilot signal beam 61-6L. Copies of the SRP J information flows rays are received at the respective first inputs of the processing units of the data signal beam 51-5Land the third input unit of decorrelation of data streams 10.

The selector signals rays 2 through the control signal from the control unit 8 carries out the separation of the input digital multi-beam signal L is detected signals rays. The output signals of the selector signals rays 2 are received at the first inputs of the respective vychitala the interfering influence of the pilot signal beam 41-4Lon the second inputs of which the output unit 7 receives signals interfering influence the pilot-signal beam from the other pilot signals rays.

The weekend is tion of the signal beam signal interfering influence the pilot-signal beam from the other pilot signals rays. The output signals of each of vychitala the interfering influence of the pilot signal beam 41-4Lcoming to the second inputs of the corresponding blocks of the data signal beam 51-5L.

In L blocks of data of the signal beam 51-5Laccording to the results of correlation processing of the pilot signal is formed by the evaluation of the complex envelope of the pilot symbols and information symbols signal streams each beam. It is assumed that the pilot signal has a continuous structure, the complex envelope corresponding time pilot and information symbols signal beams coincide. Formed of assessing the complex envelope of the pilot symbols from the second outputs of the blocks 51-5Lsupplied to the corresponding second input blocks of the evaluation, the pilot signal beam 61-6Land evaluation of complex envelope information symbols flows of signals rays are received at the third input of the block 10.

In each of the L blocks evaluation of the pilot signal beam 61-6Lform evaluation of the pilot signals rays by multiplying received at the inputs of these blocks evaluations of complex envelope of the pilot symbols of the signal beam on the corresponding copy of the SRP pilot signal beam.

In parallel for each signal beam into L blocks of data of the signal beam 51-5Lform soft decision information symbols J flows of each beam by multiplying the correlation response information symbols and the complex conjugate of the estimate of the complex envelope of information symbols of the signal beam.

Soft solutions J of information flows of each of the beams from the first outputs of the processing units of the data signal beam 51-5Lgo to corresponding inputs of J blocks combining soft decisions flow 91-9Jfor example, the inputs of the k-th block are served soft solutions rays of the k-th stream.

In blocks 91-9Jsoft solutions J information flows each beam are summed over all beams and form a combined soft-decision information symbols of each of the J streams. Thus carry out the Rake processing of information flows. The term "Rake processing" is used in the standard IS-95 [3] . Under Rake processing means combining soft decision information symbols signal beams. Combined soft decision outputs of J blocks combining soft decisions flow 91-9Jarrive at the second input unit of decorrelation party input from the fifth output control unit 8, form the joint correlation matrix of information symbols J flows, using copies of the SRP information symbol streams received at its first input, and evaluation of complex envelopes of information symbols signal rays received at its third input. Formed joint correlation matrix of information symbols J flows pay.

In block 10 performs the operation of decorrelation by multiplication of the signals combined soft decision information symbols J flows received on the second input unit 10, the sensor information symbols J flows, inverse correlation matrix information symbols J threads.

The operation of decorrelation provides suppression of the interfering influence on the flow of information caused by other traffic. The output signal of the block of decorrelation of data streams 10 represents the final soft decision information symbols J flows and is used for subsequent decoding.

The described method and apparatus have the following major drawbacks.

First, the dimension of the matrix of cross-correlations is usually great, as determined by the number of threads and the information is slideline costs.

Secondly, the evaluation of the matrix cross-correlation is performed without regard to the filtering of the received signal, which leads to significant errors in the estimation of the mutual influence of the signals of information flow signal beams at each other.

Third, this solution does not allow to fully compensate for the interfering influence of information flow signal beams at each other, because the input signal can be a variety of information streams intended for other subscriber stations interfering effect of which is not evaluated and is not adjusted.

The objective of the proposed method of reception multibeam broadband signal and device for its implementation is the increased robustness and quality of received data in a communication system.

The problem is solved in that in the method of wideband multipath signal at the subscriber station, wherein the signal of each beam contains a pilot signal and an information signal, consisting in General of independent streams of information symbols, J of which are given subscriber stations, namely, that
search signals rays,
formerum signals rays with SRP, the corresponding temporary regulations, the pilot signal of these rays,
form of assessing the complex envelope of information symbols detected signals rays generated estimates of the complex envelope of the pilot symbols detected signals rays,
form evaluation of the pilot signals detected rays,
form signals rays, purified from the interfering influence of pilot signals from other rays, subtracting from the signal of each beam evaluation of the pilot signals of all other rays,
form of the correlation responses of information symbols J flows for each of the detected beam, calculating the correlation of the signal beam, free from the interfering influence of pilot signals from other rays, with a SRP of information symbols corresponding threads of the signal beam,
form soft decision information symbols J flows of each beam, multiply the generated correlation feedback information symbols flows beam on the complex-conjugate of the evaluation of complex envelopes of the respective information symbols signal beam,
form a combined soft-decision information symbols of each of the J streams, summing over all rays of soft decisions corresponding information symbol streams lalah rays, purified from the interfering influence of pilot signals from other rays, search streams of information symbols intended for other subscriber stations,
form of the correlation responses of the information symbol streams intended for other subscriber stations, calculating the correlation of the signal beam, free from the interfering influence of pilot signals from other rays, with a SRP of information symbols corresponding threads of the signal beam,
form soft decision information symbols of all the threads devoted to other subscriber stations, multiply the generated correlation feedback information symbols flows beam meant for other subscriber stations on the complex-conjugate of the evaluation of complex envelopes of the respective information symbols signal beam,
form a combined soft-decision information symbols of each stream that is destined to other subscriber stations, summing over all rays of soft decisions corresponding information symbol streams rays,
formed combined soft decision information symbols of all detected To flow and evaluation of complex envelope information symbols signale soft decision information symbols J threads designed this subscriber stations, in P stages by suppressing the interfering effect of signals of rays at each other, with each stage
create hard decision information symbols To flow, and the first step is stored on the combined soft decision information symbols threads block in the subsequent steps according to the verified soft decision information symbols To the threads of the block of the previous stage;
form the signal of each information stream of each beam on the unit interval formed by the hard decision information symbols To the threads of the block and the estimated complex envelope information symbols signal beams;
perform smoothing of the generated estimates of the signal of each information stream of each beam on the interval block;
form the estimate of the interfering influence on the information symbols of each stream of each beam unit from each information stream of each of the other beam block;
form the estimate of the interfering influence on the information symbols of each stream of each beam unit from each information stream block;
form the estimate of the interfering influence on the information symbols of each stream of each Lu is Loka;
form updated soft decisions for each information symbol To the threads of the block in the current stage;
formed clarified soft decision information symbols J threads devoted to this subscriber stations, each information block of the P-th stage are output values.

Moreover, for example:
when searching for streams of information symbols intended for other subscriber stations, for each beam form of the correlation responses of the information symbol streams intended for other subscriber stations, calculating the correlation of the signal beam, free from the interfering influence of pilot signals from other rays, with the SRP information symbol streams intended for other subscriber stations, for each beam form soft decision information symbol streams intended for other subscriber stations by multiplying the generated correlation feedback information symbol streams intended for other subscriber stations, the estimates of complex envelopes of the respective characters, form soft decision information symbol streams intended for other subscriber stations, summarize the modules soft solutions Q information with the second threshold to make a decision about the presence or absence of information flows, designed to other subscriber stations in a received multipath signal;
when forming the hard decision information symbols To streams advanced use of the evaluation of complex envelope information symbols signal beams;
the signal of each thread of each beam on the interval block is formed by multiplying the SRP each information symbol stream of the beam formed by the hard decision information symbol and the generated estimate of the complex envelope of this information symbol signal beam on the interval length of each information symbol block;
smoothing of the generated estimates of the signal of each information stream of each beam on the interval block is performed by cubic interpolation;
the estimate of the interfering influence on the information symbols of each stream of each beam unit from each information stream of each of the other beam block is formed by multiplying the SRP information symbols flows rays on the smoothed estimate of the signal of each thread of each of the other beam;
the estimate of the interfering influence on the information symbols of each stream of each beam unit from each information stream block formermarine thread every other beam block;
the estimate of the interfering influence on the information symbols of each stream of each beam unit is formed by summing the estimates of the interfering influence on the information symbols flux beam block from each information stream block;
the estimate of the interfering influence of the soft decisions about the information symbols of each thread block is formed by weighted summation of the estimates of the interfering influence on the information symbols of the stream of rays block with weights equal to the complex conjugate of the estimated complex envelope information symbols signal beams;
refined soft decisions for each information symbol To the threads of the block in the current stage is formed by subtracting the estimation of the interfering influence on the information symbols of the flow block of the combined soft decision information symbols of the thread block.

The problem is solved also by the fact that in the device of wideband multipath signal containing a receiver for signals rays, the selector signals rays, the generator of pseudorandom sequences gpsa, L vychitala the interfering influence of the pilot signal of the beam, L blocks of data signal beam, L blocks evaluation of the pilot signal beam shaper unwanted vliyanie search signals rays and selector signals rays combined forming the input of the second input receiver for signals rays and the selector signal beams are connected respectively with the first and second outputs of the control unit that generates the first output control signal search, and the second output control signal by dividing the input signal by the signal beams, the third receiver input search signal beams, the first inputs of L blocks of data of the signal beam and the first inputs units estimates the pilot signal beam is connected to the output of the gpsa, an input connected to the third output control unit that generates the third output signal to control the temporary regulations copies of the SRP, the first control unit is connected to the output of the receiver for signals rays, each of the L outputs of the selector signal beams connected to the first input of the corresponding vicites the interfering influence of the pilot signal beam, the second inputs L vychitala the interfering influence of pilot signals of the beams are connected to the outputs of the shaper interfering influence of pilot signals rays, the output of each of the L vicites the interfering influence of the pilot signal beam is connected to a second input of the corresponding data processing unit of the signal beam, the first outputs of the processing units of the data signal beam soudaine beam is connected with the second input sootvetstvuyuschego him of the evaluation unit, the pilot-signal beam the outputs of the L blocks evaluation of the pilot signal beam is connected with the first inputs of the former (the interfering influence of pilot signals rays, a second input connected to the fourth output control unit that generates the fourth output signal to control the formation of the interfering influence of pilot signals rays, according to the invention in the device you entered:
K-J blocks combining soft decisions of the thread, the search block of information symbols of the data streams, block the formation of the interfering effect of signals of rays at each other,
memory block,
To vychitala the interfering influence of the information symbol stream,
switch
thus the inputs K-J blocks combining soft decisions of the stream connected to the outputs of the L blocks of data of the signal beam, the outputs To blocks combining soft decisions flow connected with the first inputs of the memory block, the first input unit search information symbols data flow and block the formation of the interfering effect of signals of the beams to each other is connected to the output of the gpsa, the second input of the search block of information symbols of the data streams connected to the outputs of the L vychitala the interfering influence of the pilot signal beam, the third input of the search block of information symbols of the data streams and vtok search of information symbols of the data streams connected to the fifth output control unit, forming on the fifth output signal to control the retrieval of information symbols of the data streams, the output of a search block of information symbols of the data streams is connected with the second input of the control unit, the sixth output control unit forming on the sixth output signal to control a write to memory, connected to the third input of the memory block, the outputs of the memory block connected to the first inputs To vychitala the interfering influence of the information symbol stream and a second input unit of the formation of the interfering effect of signals of rays at each other, the second inputs To vychitala the interfering influence of the information symbols of the stream connected to the output of the block forming the interfering effect of signals of rays at each other, a third input connected to the seventh output control unit forming on the seventh output signal to control the formation of the interfering effect of signals of rays at each other, the fourth input of the unit forming the interfering effect of signals of the beams to each other is connected to the first output switch, the first input connected to the outputs of vychitala the interfering influence of the information symbol stream, the second input switch connected to the eighth output control unit forming on woody switch are the outputs of the device.

Comparative analysis of the proposed method in comparison with the prototype shows that the inventive method is significantly different from the prototype, which is confirmed by a set of distinctive features in the claims.

The proposed set of distinctive features in comparison with the prototype allows you to:
first, to suppress (to compensate for the interfering effect of information flows of signals rays, intended not only for this subscriber stations, but also for other subscriber stations;
secondly, to consider the impact on the received signal of the communication channel, devices, transmission and reception and to avoid significant errors in the estimation of the mutual influence of the signals of information flows of signals rays on each other due to smoothing (filtering) generated estimates of the signal of each information stream of each beam;
thirdly, reduces the implementation complexity due to the use of subtracting the estimates of the interfering influence on the information symbols of the stream instead of complex operations with matrices.

Thus, introduces a new set of distinctive features in the inventive method allows to solve the task to improve the noise immunity and quality brinley analysis of the claimed device of wideband multipath signal with the prototype shows that the proposed device is substantially different from the prototype, namely entered:
K-J blocks combining soft decisions streams intended for other subscriber stations, to account for the interfering effects of these flows on the given subscriber station;
the search block of information symbols of the data streams intended for search of information symbols of the data streams of other subscriber stations that can detect the flow of information symbols intended for other subscriber stations and providing hindering the impact of this subscriber stations;
block the formation of the interfering effect of signals of rays at each other, which allows you to generate the interfering effect of signals of the beams at each other all detected flows at each other;
the memory block that stores the grouped blocks combined soft decision information symbols To flows and estimates of complex envelopes of information symbols signal beams;
To vychitala the interfering influence of the information symbol streams, each of which performs the subtraction of the combined soft decision information symbols flow estimation block the interfering influence on the information samolyotov flows To block received or output device, or block the formation of the interfering effect of signals of the beams at each other;
consequently entered new relationships between these units and the control unit, which unlike the prototype additionally generates four output signals:
on the fifth output control signal search information symbols of the data streams;
on the sixth output signal control record in the memory;
on the seventh output signal to control the formation of the interfering effect of signals of the beams at each other;
on the eighth output control signal switching sophisticated soft decision information symbols To streams.

New features of the claimed device allow to fully implement the inventive method, to improve the noise immunity and the quality of the received information in the communication system when the reception multibeam broadband signal.

Comparative analysis of the proposed method of wideband multipath signal and device for its implementation with other technical solutions known in the art, did not allow to detect the signs stated in the characterizing part of the formula, Isaia "novelty", significant differences", "non-obviousness" and meet the inventive step.

The inventive method of wideband multipath signal and device for its implementation are interconnected so that they form a single inventive concept. The inventive method allows to solve the task to improve the noise immunity and the quality of the received information in the communication system when the reception multibeam broadband signal, and the proposed device allows to implement all the features of the proposed method and thus provides the required technical result. Therefore, the claimed invention to satisfy the requirement of unity of invention.

Description of the invention are explained with examples and graphics.

In Fig.1 shows a block diagram of the prototype for the inventive device.

In Fig. 2 is a block diagram of the inventive device of wideband multipath signal.

In Fig. 3 - data processing unit of the signal beam 5 to the claimed device, shown as an example of the execution.

In Fig. 4 - block the formation of the interfering effect of signals of the beams at each other 12, shown as an example of the execution.

In Fig. 5 - shaper assessment>/p>In Fig.6 - control unit, provided as an example implementation.

In Fig. 7 shows the dependence of the probability of bit error (BER) using the proposed procedure and the standard algorithm demodulation on the signal to noise ratio per bit Eb/N0.

The proposed device of wideband multipath signal (Fig. 2) contains a receiver for signals rays 1, the selector signal beams 2, the generator of pseudorandom sequences gpsa 3, L vychitala the interfering influence of the pilot signal beam 41-4LL blocks of data of the signal beam 51-5LL blocks evaluation of the pilot signal beam 61-6Lthe driver interfering influence of pilot signals rays 7, the control unit 8, J blocks combining soft decisions flow 91-9Jthe first inputs of the receiver for signals rays 1 and the selector signal beams 2 are combined, forming the input of the second input receiver for signals rays 1 and the selector signal beams 2 are connected respectively with the first and second outputs of the control unit 8, the third receiver input search signal beams 1, the first inputs of L blocks of data of the signal beam 51-5Land the first inputs units estimates the pilot signal, the first input of the control unit 8 is connected to the output of the receiver for signals rays 1, each of the L outputs of the selector signal beams 2 connected to the first input of the corresponding vicites the interfering influence of the pilot signal beam 41-4Lsecond inputs L vychitala the interfering influence of pilot signals of beams 41-4Lconnected to the outputs of the shaper interfering influence of pilot signals rays 7, the output of each of the L vicites the interfering influence of the pilot signal beam 41-4Lconnected with the second input of the corresponding data processing unit of the signal beam 51-5Lthe first outputs of the processing units of the data signal beam 51-5Lconnected with the inputs of the J blocks combining soft decisions flow 91-9Jthe second output of each of the L blocks of data of the signal beam 51-5Lconnected with the second input sootvetstvuyuschego him of the evaluation unit, the pilot-signal beam 61-6Lthe outputs of the L blocks evaluation of the pilot signal beam 61-6Lconnected with the first inputs of the former (the interfering influence of pilot signals rays 7, a second input connected to the fourth output of the control unit 8, according to the invention additionally contains K-J blocks Obyedinennaya interfering effect of signals of the beams at each other 12, the memory unit 13, To vychitala the interfering influence of the information symbol stream 141-14Kthe switch 15, and the input K-J blocks combining soft decisions flow 9J+1-9Kconnected to the outputs of the L blocks of data of the signal beam 51-5Loutputs To blocks combining soft decisions flow 91-9Kconnected with the first inputs of the memory unit 13, the input unit search information symbols of the data streams 11 and block the formation of the interfering effect of signals of the beams at each other 12 connected to the output of the gpsa 3, the second input unit search information symbols data flow 11 is connected to the outputs of the L vychitala the interfering influence of the pilot signal beam1-4Lthe third input of the search block of information symbols of the data streams 11 and the second input of the memory unit 13 is connected to the second outputs of the L blocks of data of the signal beam 51-5Lthe fourth input of the unit search information symbols data flow 11 is connected to the fifth output control unit 8, the output unit search information symbols data flow 11 is connected with the second input of the control unit 8, the sixth output control unit 8 is connected to the third input of the memory unit 13, the outputs of the memory block 13 with the and a second input unit of the formation of the interfering effect of signals of the beams at each other 12, the second inputs To vychitala the interfering influence of the information symbol stream 141-14Lconnected to the output of the block forming the interfering effect of signals of the beams at each other 12, a third input connected to the seventh output control unit 8, the fourth input of the unit forming the interfering effect of signals of the beams at each other 12 is connected with the first output switch 15, the first input connected to the outputs of vychitala the interfering influence of the information symbol stream 141-14Kthe second input of the switch 15 is connected to the eighth output control unit 8, the outputs of the switch 15 are the outputs of the device.

L blocks of data of the signal beam for the proposed device is identical to the example implementation shown in Fig.3. The data processing unit of the signal beam (Fig.3) contains a node of assessing the complex envelope of the pilot symbols and information symbols 16 To correlators 171-17Kand shaper soft decision information flows 18, the first input node of assessing the complex envelope of the pilot symbols and information symbols 16 and correlators 171-17KUnited, forming the first input of the data processing unit of the signal beam, the second inputs connected with the corresponding first inputs of the former (soft decision information flows 18, the outputs of which are the first outputs of the data processing unit of the signal beam, the output node of assessing the complex envelope of the pilot symbols and information symbols 16 is connected with the second input of the shaper soft decision information flows 18 and the second output data processing unit of the signal beam.

Block the formation of the interfering effect of signals of the beams at each other for 12 of the inventive device shown in Fig.4 as an example of the execution and contains shaper crucial statistics 19, shaper tough decisions 20 To sites of formation evaluation interfering influence of the information symbols of all rays threads 211-21Kand shaper interfering influence the character information flows 22 and the first inputs To the nodes forming assess the interfering influence of the information symbols of all rays threads 211-21KUnited, forming the first input of the block forming the interfering effect of signals of the beams at each other 12, the second inputs To the nodes forming assess the interfering influence of the information symbols of all rays threads 211-21Kthe first input of the shaper crucial statistics 19 and shaper interfering influence the character information flows 22 United, obrady shaper crucial statistics 19 is connected to the input of the shaper tough decisions 20, To outputs of which are connected with the corresponding third inputs To the nodes forming assess the interfering influence of the information symbols of all rays threads 211-21Kthe outputs are connected with the second inputs of the former (the interfering influence the character information flows 22, a third input which is the third input of the block forming the interfering effect of signals of the beams at each other 12, the outputs of the shaper interfering influence the character information flows 22 are outputs of the block 12.

To sites of formation evaluation interfering influence of the information symbols of all rays threads 211-21Kmade the same way and shown in Fig.4 as an example implementation. Each node formation evaluation interfering influence of the information symbols of all rays threads 211-21Kcontains L shapers estimate the interfering influence of information symbols rays threads 231J-23LJthe first, second and third inputs are combined and are the first, second and third inputs of node formation evaluation interfering influence of the information symbols of all rays stream 211-21Kand their outputs are the outputs of node formation evaluation mecause the impact of information symbols rays threads 231J-23LJmade the same way and is shown as an example in Fig. 5. Thus, for example, the driver estimates the interfering influence of information symbols k-th ray j-flow 23kjcontains the first 24 and second 25 multiplier products, the element smoothing signal 26 and the third multiplier 27, the first inputs of the first multiplier 24 and the third multiplier 27 are combined, forming the first input of the shaper estimate the interfering influence of information symbols k-th beam of the j-th stream 23kjthe second input of the first multiplier 24 is the second input of the shaper estimate the interfering influence of information symbols k-th beam of the j-th stream 23kjthe output of the first multiplier 24 is connected to the second input of the second multiplier 25, the first input of which is the third input of the shaper estimate the interfering influence of information symbols k-th beam of the j-th stream 23kjthe output of the second multiplier 25 is connected to the input element of the smoothing signal 26, the output of which is connected to a second input of the third multiplier 27, the outputs of which are outputs of the shaper estimate the interfering influence of information symbols k-th beam of the j-th stream 23kj. The control unit 8 may be made of various obronie clock 29, the divider 30 and the delay line 31, the output of the divider is connected to the first input of the microcomputer 28, the first, second, third, fourth and fifth outputs of the delay lines 31 are connected respectively with the second, third, fourth, fifth and sixth inputs of the microcomputer 28, the seventh and eighth inputs of the microcomputer 28 are respectively the first and second inputs of the control unit 8, the first, second, third, fourth, fifth, sixth, seventh and eighth outputs of the microcomputer 28 are respectively first, second, third, fourth, fifth, sixth, the seventh and eighth outputs of the control unit 8.

Fig. 6 illustrates the algorithm of the control unit 8 and including the algorithm of the microcomputer 28, which includes the formation of eight control signals:
32 - forming control signals for signals rays,
33 - the formation of the control signal by dividing the input signal into signals rays,
34 - forming control signal temporal position of copies of the SRP,
35 - the formation of the control signal forming the interfering influence of pilot signals rays,
36 - forming control signal search information symbols data flow,
37 - the formation of the control signal is a write to memory,
38 - the formation of si the Board switched refined soft decision information symbols of the stream.

Implement the inventive method of reception multibeam broadband signal in the communication system on the device, the block diagram of which is shown in Fig.2.

Preliminarily it should be noted that the standard transfer operation frequency of the input high-frequency signal videocasette and forming the input digital multi-beam signal is made. The complex amplitude of the signal in the radio channel remains constant during one symbol interval, but in General varies from symbol to symbol. Processing of the received digital multibeam signal is performed character by character. The signal of each beam contains a pilot signal and an information signal consisting of independent streams of information symbols, J of which are intended for the subscriber station, and the rest flows - other subscriber stations.

The input digital multi-beam signal is supplied to the first inputs of the receiver for signals rays 1 and the first input of the selector signals rays 2.

The pseudo-random sequence generator (gpsa) 3 on the control signal received at its input from the third output of the control unit 8 generates copies of the SRP pilot signal. Output gpsa 3 copies of the SRP pilot signal postupayeva output control unit 8 receives a control signal search. On this signal the receiver for signals rays 1 scans the time interval, determines the pilot-signal temporal position of the signal beams and transmits them to the first input of the control unit 8.

Gpsa 3 for L found temporary rays on the control signal received at its input from the third output of the control unit 8 generates a copy of the SRP pilot signals and a copy of the SRP To information flows. A copy of the SRP pilot signal beams are fed to respective first inputs of the processing units of the data signal beam 51-5Land the corresponding first inputs units estimates the pilot signal beam 61-6L.

Copies of the SRP K-J information flows rays intended for other subscriber stations, proceed to the first input of the search block of information symbols of the data streams 11.

The selector signals rays 2 through the control signal received at its second input from the second output control unit 8 that performs the separation of the input digital multi-beam signal L is detected signals rays. The selector signal beams 2 may be performed, for example, on the basis of the standard L outlet controlled delay line. The delay time for each signal beam L of the soil in which the times of arrival of the detected signals rays. The output signals of the selector signals rays 2 are received at the first inputs of the corresponding L vychitala the interfering influence of the pilot signal beam 41-4Lon the second input of which receives signals interfering influence the pilot-signal beam from the other pilot signals rays from the output unit 7.

The output signals of each of vychitala the interfering influence of the pilot signal beam 41-4Lformed by subtracting from the signal beam signal interfering influence the pilot-signal beam from the other pilot signals rays. The output signals of each of vychitala the interfering influence of the pilot signal beam 41-4Lfree from the interfering influence of pilot signals from other rays arrive at the second input of the corresponding block data signal beam 51-5Land to the second input of the search block of information symbols of the data streams 11.

In L blocks of data of the signal beam 51-5Laccording to the results of correlation processing of the pilot signal form the evaluation of the complex envelope of the pilot symbols and information symbols signal streams each beam. If the pilot signal has a continuous structure, evaluation of the complex envelope corresponding time pilot and information Hsieh envelope information symbols according to the estimates of the complex envelope of the pilot symbol signal is complicated and is, for example, with respect to one or more pilot symbols by averaging their estimates, for example, as described [11] H. Andoh, M. Sawahashi, and F. Adachi, Channel Estimation Filter Using Time-Multiplexed Pilot Channel for Coherent RAKE Combining in DS-CDMA mobile radio // IEICE Trans. Commun - July 1998 - Vol.E81-B - 7. - P. 1517-1526, or as described [12] S. Abeta, M. Sawahashi, and F. Adachi Performance comparison between time-multiplexed pilot channel and parallel pilot channel for coherent rake combining is DS-CDMA mobile radio // IEICE Trans. Commun. - July 1998 - Vol. E81-B - 7. - R. 1417-1425, or as described [13] Algorithms quasicoherent receiving phase-shift keyed signals in a channel with fast fading / A. Century of FSH, Y. E. Karpatsky, C. N. Manelis, A. Y. Savinkov // M: Digital signal processing, 2001, - 3, S. 2-8.

Formed of assessing the complex envelope of the pilot symbols from the second outputs of the blocks 51-5Larrive at their respective second inputs units estimates the pilot signal beam 61-6Land evaluation of complex envelope information symbols flows of signals rays arrive at the third entrance of the search block of information symbols of the data streams 11 and the second input of the memory block 13.

In each of the L blocks evaluation of the pilot signal beam 61-6Lform evaluation of the pilot signals rays by multiplying received at the inputs of these blocks evaluations of complex envelope of the pilot symbols of the signal beam by the input unit 7.

In block 7 of the form signals interfering influence the pilot-signal rays from the pilot signals of other rays by summing estimates of the pilot signals of the other beams.

The control signal search information symbols data flow, which is supplied to the fourth input of the unit search information symbols 11 from the fifth output control unit 8, unit 11 searches the information symbols of the data streams intended for other subscriber stations.

In block 11 search streams of information symbols intended for other subscriber stations can be performed in different ways. For example, for each beam form of the correlation responses of the information symbol streams intended for other subscriber stations, calculating the correlation of the signal beam, free from the interfering influence of pilot signals from other rays, with a SRP of information symbols threads devoted to other subscriber stations. For each beam form soft decision information symbol streams intended for other subscriber stations by multiplying the generated correlation feedback information symbol streams intended for other subscriber stations, to assess kompleksnihkh other subscriber stations, summarize the modules soft decision information symbols Q flow available to other subscriber stations. The results of the summation is compared with a given threshold and make a decision about the presence or absence of information flow available to other subscriber stations.

At the same time form a signal about the search results information flows destined to other subscriber stations, which output unit 11 is supplied to the second input of the control unit 8. On this signal the control unit 8 generates a control signal temporal position of copies of the SRP, which comes from the third output unit 8 to the input of gpsa 3.

This control signal copies SRP characters all To the detected information flows coming from the output gpsa 3 on the input blocks of data of the signal beam 51-5L
For each signal beam in the corresponding data processing unit of the signal beam 51-5Lform soft decision information symbols To the information flow of each beam by multiplying the correlation of responses and the complex conjugate of the estimate of the complex envelope of information symbols of the signal beam. Correlation feedback information sitates the interfering influence of the pilot signal beam 41-4Land counts copies SRP symbols.

Soft decision information symbols To threads rays from the first outputs of the processing units of the data signal beam 51-5Lproceed to the appropriate inputs To the block combining soft decisions flow 91-9Kfor example, the inputs of the k-th block 9kserved soft solutions rays of the k-th information flow.

In blocks combining soft decisions flow 91-9Kfor each information flow summed soft decision flow-rays on all rays, forming the combined soft decision information symbols of each of the K streams.

The signals combined soft decision symbol stream from the outputs of blocks combining soft decisions flow 91-9Kcome to the first inputs of the memory block 13.

The control signal is a write to memory, which is supplied to the third input of the memory block 13 from the sixth output control unit 8, a memory unit 13 groups combined soft decision symbols flows and assessing the complex envelope of information symbols signal rays in blocks of intervals of duration T and remembers them. Signal processing is carried out block by block. The processing of each block undertake the keys in blocks 12, 141-14Kand 15.

Output signals from the memory unit 13 character received at the first inputs of the respective vychitala the interfering influence of the information symbol stream 141-14Kand on the second inputs of the block forming the interfering effect of signals of the beams at each other 12.

The control signal forming the interfering effect of signals of rays at each other, which is supplied to the third input of the block 12 from the seventh output control unit 8, block 12 form the estimate of the interfering influence of the soft decisions about the information symbols of each thread block. Formed evaluation output unit 12 is supplied to the second inputs of the respective vychitala the interfering influence of the information symbol stream 141-14K.

In blocks 141-14Kform updated soft decisions for each information symbol To the threads of the block by subtracting from the combined soft decision information symbols threads block corresponding estimates of the interfering effect of the soft decision information symbols threads of the block. Formed clarified soft decisions for each information symbol To the threads of the block in the current stage arrives at the first input of the switch 15.

The signal UPRAVLENIE soft decisions for each information symbol flows To block all stages, except the last, from the first output of the switch 15 are received on the fourth input of the unit forming the interfering effect of signals of the beams at each other 12. For the last P-th stage of the adjusted soft decisions for each information symbol J threads devoted to this subscriber station, proceed to the second output of the switch 15, which is the output device.

The switch 15 may be implemented, for example, on the basis of K managed keys with one input and two outputs each. At all stages except the last updated soft decisions To the threads go through the appropriate keys to the first output of the switch 15. On the last R stage refined soft solutions J of threads dedicated to this subscriber station, proceed to the second output of the switch 15.

Let us consider the work of one of the blocks of data of the signal beam 51-5L, an example of which is shown in Fig.3.

Output gpsa 3 copies SRP symbols of pilot signals received at the first input node of assessing the complex envelope of the pilot symbols and information symbols 16 and to the first inputs of correlators 171-17K- the relevant copy of the SRP information symbols of the data streams. On the about vicites the interfering influence of the pilot signal beam, cleared from the interfering influence of pilot signals from other beams.

Node 16 is formed of assessing the complex envelope of the pilot symbols and information symbols. Evaluation of the complex envelope of the pilot symbols is formed by summing the products of samples of the output signal of vicites the interfering influence of the pilot signal beam and counts copies SRP respective pilot symbols. Estimates of the complex envelope of the pilot symbols form of assessing the complex envelope of information symbols flows beam. The output signals of the block 16 are received at the second input of the shaper soft decision information flows 18 and to the second output of the data processing unit of the signal beam.

In the correlators 171-17Kform of the correlation responses of information symbols of the signal beam by summing the products of samples of the output signal of the corresponding vicites the interfering influence of the pilot signal beam and counts copies SRP relevant information symbols. The generated correlation responses of characters To information flows beam received at the first input of the shaper soft decision information flows 18.

In block 18 to form soft decision information symbols To sweat the second evaluation of the complex envelope of the information symbol stream signal beam, which receives the first output data processing unit of the signal beam.

Let us consider the operation of the unit forming the interfering effect of signals of the beams at each other 12, an example of which is shown in Fig.4.

The output signal from the switch 15 is supplied with the first output to the fourth input unit 12, which is formed by the first inputs of the former (the crucial statistics 19.

From the memory unit 13 estimates the complex envelope of information symbols signal rays are received at the second input unit 12, which is formed joint second input of the shaper crucial statistics 19, the second input nodes of formation evaluation interfering influence of the information symbols of all rays stream 211-21Kand the first input of the shaper interfering influence the character information flows 22.

In the shaper crucial statistics 19 for K symbols of information flows block form a crucial statistics, which goes to the input of the shaper tough decisions 20. View the crucial statistics depends on the type of modulation of the input signal. In the General case, the critical statistics for the k-th information symbol stream at arbitrary modulation can be written in the following form
evaluation of the sum of the squares of the complex envelope information of symbol signals of all rays.

For some types of modulation procedure of formation of the critical statistics can be simplified. For example, for signals with a phase modulation (PSK) [9] had Soured J., Digital communication, Radio and Communications, 2000, in the expression for the crucial statistics b2k+and2k= 1, and the last term is negligible. For the formation of the crucial statistics sum of squares of the estimated complex envelope information symbol signal rays in this case is not required.

The formation of the crucial statistic in the first stage is carried out with the memorized in the memory unit 13 combined soft decision information symbols K threads in the subsequent steps according to the verified soft decision information symbols To the threads of the block of the previous stage.

In the General case, the shaper crucial statistics 19 form a crucial statistic for all possible values of the information symbol that p is s symbol streams block in the node 20 are formed of a hard decision information symbols of each of the flows To block.

The complexity of the procedure of forming the hard decision information symbols To each of the threads depends on the type of modulation. In the General case it is necessary to determine the value of the information symbol corresponding to the maximum value of the crucial statistics, However, for specific types of modulation procedure of forming hard decisions can be simplified.

For example, for BPSK binary phase modulation it is enough to compare the values of the real part of the combined soft decision Withkwith a zero threshold. When the threshold is exceeded, the hard decision is one, when that does not exceed minus one. For QPSK modulation with a zero threshold is enough to compare the values of the real and imaginary part of the combined soft-decision CkDk.

The more complex modulation scheme, the less distinct possible values of information symbols. Therefore, in this invention, if the value of the winning statistics close to each other, the hard decision information symbol put equal to zero.

Formed a hard decision on the information symbol streams unit output node 20 receives at the third input of the corresponding nodes forming the interfering influence of the information symbols of all the first input unit 12, formed by the first inputs of the nodes forming the estimation of the interfering influence of the information symbols of all rays stream 211-21K.

Each node 211-21Kcontains L shapers estimate the interfering influence of information symbols beam flux 231-23Leach of them contribute to the assessment of the interfering influence of information symbols beam of this thread.

The nodes 211-21kform of assessment the interfering influence of information symbols for all rays of threads that outputs of these nodes are received at respective second inputs of the former (the interfering influence the character information flows 22, a third input which receives a control signal from the seventh output unit 8.

Shaper interfering influence the character information flows of all beams all the threads 22 may be performed, for example, on the basis of the adder. The control signal forming the interfering effect of signals of the beams at each other in the unit 22 sequentially form:
the estimate of the interfering influence on the information symbols of each stream of each beam unit from each information stream block by summing the estimates of the interfering influence on the information symbol stream locazione characters each thread of each beam block by summing the estimates of the interfering influence on the information symbols flux beam block from each information stream block;
the estimate of the interfering influence of the soft decisions about the information symbols of each stream block by weighted summation of the estimates of the interfering influence on the information symbols of the stream of rays block with weights equal to the complex conjugate of the estimated complex envelope information symbols signal rays.

Evaluation of the preventing effect of the soft decision information symbols threads of a block are received at the output node 22, which form the output of block 12.

Let us consider the Builder estimates the interfering influence of information symbols k-th beam of the j-th stream 23jkthe example implementation shown in Fig.5.

Formed the hard decision information symbols of the thread block and the estimates of the complex envelope of information symbols signal beams connected in series multiplier products 24 and 25 form the signal of the j-th information flow the k-th beam block.

The first inputs of the multiplier 24 and the multiplier 27 forming the first input of the shaper estimate the interfering influence of information symbols beam flux 23jk, signal from gpsa 3, and to the first input of multiplier 24 receives a copy of the SRP of the j-th information flow the k-th beam block, and the second input of the multiplier 24, forming the second input of the shaper 23jkfrom the memory unit 13 receives the evaluation of the complex envelope of the signal of the k-th beam block.

At the first input of the multiplier 25, which forms the third input of the shaper 23jkwith shaper tough decisions do 20 evaluation of the hard decision information symbols of the j-th stream of the block.

To the second input of the multiplier 25 receives the signal from the output of the multiplier 24. Out of the received signals in the multiplier 25 form the signal of the j-th information flow the k-th beam unit, which is fed to the input element of the smoothing signal 26.

In item 26 carry out the smoothing of the evaluation signal j-th information flow the k-th beam, for example, by cubic interpolation using values generated evaluation signal.

The signal evaluation of the j-th information flow the k-th beam in the interval block discretizing with sampling period equal to the duration of the chip. Under the chip SRP understand the duration of one time elementary interval of the SRP. Signal values at these points are used for procedures cubic interpolation (smoothing), which is performed, for example, as described in the book [12] L. I. Turchak. Fundamentals of numerical methods. Moscow, Nauka the spacing block can be performed in various ways, for example, by digital filtering. However, from the point of view of practical implementation and the amount of computing cost proposed in the invention approach the cubic interpolation is preferred.

The output signal of the block smoothing signal 26 is supplied to the second input of the multiplier 27. In the multiplier 27 smoothed estimation of the signal of the j-th information flow the k-th beam block Peremohy with copies of the SRP of the j-th information flow other rays of the block.

The output signals of the multiplier 27, which estimates the interfering influence from the j-th information flow the k-th beam block to the j-th information flow other rays block, form the output of the shaper 23jk.

The control unit 8 may be performed in various ways. In Fig.6 shows an example of executing a control unit 8, which can be implemented on modern microprocessors digital signal processing (DSP), for example TMS 320Cxx, Motorola 56xxx, Intel, etc.

Consider the algorithm of the control unit 8 (Fig.6).

The sequence of control signals generated in the control unit 8, the synchronized signals of the divider 30 and the multi-tap delay line 31. Clock signals are generated by the generator t according to the proposed method. The sequence of control signals from a control unit 8 for each R-step procedure of signal processing is formed in the following order.

On the output signal of the divider 30, which receives at the first input of the microcomputer 28 are formed:
The control signal search (item 32), which is supplied to the first output control unit 8. The control signal search, such as searching for parallel processing mode of the signal is a digital signal with a period equal to the time of analysis at each time position. At each period of the signal to perform switching on the next cycle of the search mode in the receiver the signals of beams 1 and read temporary position signals rays that were detected in the previous search cycle. Information on the temporal position of the signal beams is supplied to the seventh input of the microcomputer 28.

The control signal temporal position of copies of the SRP (34), which is supplied to the third output of the control unit 8 contains information about the possible temporal positions of the pilot signals rays. After the end of each cycle of the search in the microcomputer 28 is formed a control signal temporal position of copies of the SRP (34) estimated temporal position of the detected signals rays and whitefish the period, equal to the cycle time of the search and delayed in delay line 31 on the cycle time of the search.

The generated control signal temporal position of copies of the SRP contains information about the possible temporal positions of copies of the SRP pilot signals rays for subsequent iterations of the search, found temporary positions copies of the SRP pilot signals rays previous search cycle, on the temporal positions of copies of the SRP for the flow of information symbols intended for this subscriber stations and temporary positions copies of the SRP information flows symbols intended for other subscriber stations.

At the same time in the microcomputer 28 (33, 35 and 36) on a signal from the first output of the delay line 31 form:
the control signal by dividing the input signal by the signal beams (33),
the control signal forming the interfering influence of pilot signals rays (35),
the control signal search information symbols data flow (36).

The control signal by dividing the input signal by the signal beams of the selector signals rays 2 contains estimates of the relative time positions of each detected signal beam.

The control signal shaper interfering influence of pilot signals rays, for example, can PGO form the estimate of the interfering influence, is zero, while for all other signals rays is one.

The control signal search information symbols of the data streams (36) is designed to control the retrieval information data streams that are intended for other subscriber stations. The control signal search information symbols data flow contains information about copies of the SRP information symbols of the data streams that are intended for other subscriber stations.

In the microcomputer 28 to form the control signal temporal position of copies of the SRP (34) estimated temporal position of the detected signals rays, estimated time positions detected streams of symbols intended for other subscriber stations, and the signal from the second output of the delay line 31, which represents, for example, a digital signal, delayed in time cycles of the search in block 1 and in block 11.

The control signal temporal position of copies of the SRP contains information about the possible temporal positions of copies of the SRP pilot signals rays for subsequent iterations of the search, found temporary positions copies of the SRP pilot signals rays previous search cycle, on the temporal positions of copies of the SRP for this subscriber stations and on the temporal position of the implement further control signals in the delay lines 31 take into account time delays, occurs during the processing of the signal.

In the microcomputer 28 to the signal from the third output of the delay line 31, which is a digital signal whose period is equal to, for example, the duration of the unit interval, T, to form the control signal memory write (37), which provide unit record in the memory unit 13 combined soft decision information symbols and estimates the complex envelope of the character signals rays and reading from the memory block 13.

In the microcomputer 28 to the signal from the fourth output of the delay line 31, which represents, for example, when character-by-character processing digital signal whose period is equal to the length of the information symbol stream, to form the control signal forming the interfering effect of signals of the beams to each other (38).

In the microcomputer 28 to the signal from the fifth output of the delay line 31 to form the control signal switching sophisticated soft decision information symbol streams (39), which is a digital signal whose period is equal to, for example, the duration of the unit interval, So

For the proposed method was carried out computer simulation. In terms of Rayleigh fading corresponding to the Jakes model [13] communication with the cargo the BA compared with the known method according to the standard IS-95 [3].

In Fig. 7 shows the dependence of the probability of bit error (BER) when using the proposed method and the method according to the standard IS-95 [3] from the signal-to-noise ratio per bit Eb/N0where
Ebthe energy of the signal in the interval a bit,
N0- power spectral density of the noise.

Curves of Fig. 7 provides for a two-beam federowski channel. The temporal distance between signals rays - 2 ISS, fading signals rays relied independent, the average power of the signal beams are the same. The modulation scheme is QPSK, the number of information flows - 16, the duration of the symbol - 13 ISS.

When modeling the observed rapid convergence characteristics of the proposed method. Already after 2-3 stages of processing characteristics almost reached their limits.

It is evident from Fig. 7 shows that the gain in probability of bit error (BER) of the proposed method in comparison with the known algorithm for BER level=20% is 6 dB. Level BER=19% and less well-known algorithm loses efficiency, while the inventive method provides acceptable performance.

The evaluation of the computational complexity of the proposed multistep method increases with the number of rays to take the ri the number of information flows K=16 and the number of rays p=2, the required number of elementary operations in the evaluation of the information parameters To all flows of approximately 104that allows you to implement the invention on modern element base.

Significant gain in accuracy demodulation broadband multibeam signal allows to make a conclusion about the prospects of using a multi-stage procedure in the communication equipment when receiving a multipath signal that contains a lot of information flows.

Thus, the claimed group of inventions, a method of receiving multi-beam broadband signal and device for its implementation created in a single inventive concept, allows you to:
first, to suppress (to compensate for the interfering effect of information flows of signals rays, intended not only for this subscriber stations, but also for other subscriber stations;
secondly, to consider the impact on the received signal of the communication channel, devices, transmission and reception and to avoid significant errors in the estimation of the mutual influence of the signals of information flows of signals rays on each other due to smoothing (filtering) generated estimates of the signal of each information stream of each beam;
thirdly, to reduce the implementation complexity due to the use of subtracting the estimates of the interfering influence on the information symbols flux the symbols of the data streams.


Claims

1. The method of receiving multi-beam broadband signal at the subscriber station, wherein the signal of each beam contains a pilot signal and an information signal, consisting in General of independent streams of information symbols, J of which are given subscriber stations, which consists in the fact that search signals rays form of assessing the complex envelope of the pilot symbols detected signals rays, calculating the correlation of the detected signals rays with a pseudorandom sequence of the SRP, the corresponding temporary regulations, the pilot signal of these rays, form of assessing the complex envelope of information symbols detected signals rays generated estimates of the complex envelope of the pilot symbols detected signals rays form evaluation of pilot signals detected rays form the signals rays, purified from the interfering influence of pilot signals from other rays, subtracting from the signal of each beam evaluation of the pilot signals of all other rays form of the correlation responses of information symbols J flows for each of the detected beam, calculating the correlation of the signal beam, free from the interfering influence of PI is the cue decision information symbols J flows of each beam, multiply the generated correlation feedback information symbols flows beam on the complex conjugate of the evaluation of complex envelopes of the respective information symbols signal beam, form a combined soft-decision information symbols of each of the J streams, summing over all rays of soft decisions corresponding information symbol streams rays, characterized in that the detected signals rays without interfering influence of pilot signals from other rays, search streams of information symbols intended for other subscriber stations, the form of the correlation responses of the information symbol streams intended for other subscriber stations, calculating the correlation of the signal beam, free from the interfering influence of pilot signals from other rays, with the SRP information symbols corresponding flow signal beam form soft decision information symbols of all the threads devoted to other subscriber stations, multiply the generated correlation feedback information symbols flows beam meant for other subscriber stations, a complex conjugate of the evaluation of complex envelopes of the respective infoteka, designed to other subscriber stations, summing over all rays of soft decisions corresponding information symbol streams of rays formed by the combined soft-decision information symbols are all found To be independent threads devoted to this and other subscriber stations, and evaluation of complex envelope information symbols signal beams are grouped in blocks of intervals of duration T and remember, for each block in revised form soft decision information symbols J threads devoted to this subscriber stations, in P stages by suppressing the interfering effect of signals of rays at each other, with each stage form a hard decision information symbols To threads and the first step is stored on the combined soft decision information symbols threads block in the subsequent steps according to the verified soft decision information symbols To the threads of the block of the previous stage, form the signal of each information stream of each beam on the unit interval formed by the hard decision information symbols To the threads of the block and the estimated complex envelope information symbols signal beam of the shaft unit, form the estimate of the interfering influence on the information symbols of each stream of each beam unit from each information stream of each of the other beam of the unit, using the smoothed estimate of the signal to every thread of every other beam, to form estimates interfering influence on the information symbols of each stream of each beam unit from each information stream block using assessment interfering influence on the information symbols of each stream of each beam unit from each information stream of each of the other beam block, form the estimate of the interfering influence on the information symbols of each stream of each beam unit, using assessment interfering influence on the information symbols of each stream of each beam unit from each information stream block form the estimate of the interfering influence of the soft decisions about the information symbols of each thread block using assessment interfering influence on the information symbols of each stream of each beam unit create sophisticated soft decisions for each information symbol To the threads of the block in the current stage, using assessment interfering influence on the information symbols of the flow block, the generated refined soft decision informazioa are output values.

2. The method according to p. 1, characterized in that when searching for streams of information symbols intended for other subscriber stations, for each beam form of the correlation responses of the information symbol streams intended for other subscriber stations, calculating the correlation of the signal beam, free from the interfering influence of pilot signals from other rays, with the SRP information symbol streams intended for other subscriber stations, for each beam form soft decision information symbol streams intended for other subscriber stations by multiplying the generated correlation feedback information symbol streams intended for other subscriber stations, the estimates of complex envelopes of the respective characters, form soft decision information symbol streams intended for other subscriber stations, summarize the modules soft decision information symbols Q streams intended for other subscriber stations, comparing the sum with a predetermined threshold to decide about the presence or absence of information flow available to other subscriber stations in a received multipath signal.

3. The method according to p. 1, on isout evaluation of complex envelope information symbols signal rays.

4. The method according to p. 1, characterized in that the signal of each thread of each beam on the interval block is formed by multiplying the SRP each information symbol stream of the beam formed by the hard decision information symbol and the generated estimate of the complex envelope of this information symbol signal beam on the interval length of each information symbol block.

5. The method according to p. 1, characterized in that the smoothing of the generated estimates of the signal of each information stream of each beam on the interval block is performed by cubic interpolation.

6. The method according to p. 1, characterized in that the estimation of the interfering influence on the information symbols of each stream of each beam unit from each information stream of each of the other beam block is formed by multiplying the SRP information symbols flows rays on the smoothed estimate of the signal to every thread of every other beam.

7. The method according to p. 1, characterized in that the estimation of the interfering influence on the information symbols of each stream of each beam unit from each information stream block is formed by summing the estimates of the interfering influence on the information symbols flux beam block from kazdego impact on the information symbols of each stream of each beam unit is formed by summing the estimates of the interfering influence on the information symbols flux beam block from each information stream block.

9. The method according to p. 1, characterized in that the estimation of the interfering influence of the soft decisions about the information symbols of each thread block is formed by weighted summation of the estimates of the interfering influence on the information symbols of the stream of rays block with weights equal to the complex conjugate of the estimated complex envelope information symbols signal rays.

10. The method according to p. 1, characterized in that the revised soft decisions for each information symbol To the threads of the block in the current stage is formed by subtracting the estimation of the interfering influence on the information symbols of the flow block of the combined soft decision information symbols of the thread block.

11. The device of wideband multipath signal containing a receiver for signals rays, the selector signals rays, the generator of pseudorandom sequences gpsa, L vychitala the interfering influence of the pilot signal of the beam, L blocks of data signal beam, L blocks evaluation of the pilot signal beam, where L corresponds to the number of detected rays, shaper interfering influence of pilot signals rays, the control unit, J blocks combining soft decisions of the stream, where J corresponds to the number of threads devoted to this subscriber I input device, the second inputs of the receiver for signals rays and the selector signal beams are connected respectively with the first and second outputs of the control unit that generates the first output control signal search, and the second output control signal by dividing the input signal by the signal beams, the third receiver input search signal beams, the first inputs of L blocks of data of the signal beam and the first inputs units estimates the pilot signal beam are connected to the outputs of the gpsa, an input connected to the third output control unit that generates the third output signal to control the temporary regulations copies of the SRP, the first control unit is connected to the output of the receiver for signals rays, each of the L outputs of the selector signal beams connected to the first input of the corresponding vicites the interfering influence of the pilot signal beam, the second inputs L vychitala the interfering influence of pilot signals of the beams are connected to the outputs of the shaper interfering influence of pilot signals rays, the output of each of the L vicites the interfering influence of the pilot signal beam is connected to a second input of the corresponding data processing unit of the signal beam, the first outputs of the processing units of the data signal of the beam are connected with the inputs of the J blocks of the second input corresponding evaluation unit, the pilot-signal beam the outputs of the L blocks evaluation of the pilot signal beam is connected with the first inputs of the former (the interfering influence of pilot signals rays, a second input connected to the fourth output control unit that generates the fourth output signal to control the formation of the interfering influence of pilot signals rays, characterized in that the input-J block combining soft decisions of the stream, where K corresponds to the number of independent streams of information symbols intended for this and other subscriber stations, the search block of information symbols of the data streams, block the formation of the interfering effect of signals of rays at each other, the memory block, To vychitala the interfering influence of information symbols, flow, switch, while the inputs To the J blocks combining soft decisions of the stream connected to the additional first outputs L blocks of data of the signal beam, the outputs To blocks combining soft decisions flow connected with the first inputs of the memory block, the first input unit search information symbols data flow and block the formation of the interfering effect of signals of the beams to each other are connected to the outputs of the gpsa, the second input of the search block of information symbols of the data streams connected with wyhtumov data and the second input of the memory block connected to the second outputs of the L blocks of data signal beam, the fourth input of the search block of information symbols of the data streams connected to the fifth output control unit that generates the fifth output signal to control the retrieval of information symbols of the data streams, the output of a search block of information symbols of the data streams is connected with the second input of the control unit, the sixth output control unit forming on the sixth output signal to control a write to memory, connected to the third input of the memory block, the outputs of the memory block connected to the first inputs To vychitala the interfering influence of the information symbol stream and a second input unit of the formation of the interfering effect of signals of rays at each other, the second inputs To vychitala the interfering influence of the information symbols of the stream connected to the output of the block forming the interfering effect of signals of rays at each other, a third input connected to the seventh output control unit forming on the seventh output signal to control the formation of the interfering effect of signals of rays at each other, the fourth input of the unit forming the interfering effect of signals of the beams to each other is connected to the first output switch, the first input connected to the outputs of vychitala interfering influence informationsome the output signal to control switching of the adjusted soft decision information symbol stream, the outputs of the switch are the outputs of the device.

 

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