The method of parallel multi-frequency composite signal and device for its implementation

 

The invention relates to the field of digital information and can be used to implement multi-channel modems with parallel multi-frequency composite orthogonal signals. The technical result - the reduction of the degree of influence of selective noise immunity of digital information in modems with parallel multi-frequency composite orthogonal signals. The technical result is achieved by pre-storing signals corresponding to the nominal level of each of the i-th subcarriers U0ithe calculations for each of the subcarriers at the end of the signal elements in assessing the level Uithe corresponding i-th subcarrier, averaging the calculated estimate of the level Uifor each i-th subcarrier on the number of sequentially received information symbols to change the amplitude of the inphase and quadrature components of the reference signals corresponding to each of the subcarriers, which are used to receive the next signal elements. In the device for this purpose, each of the N processing units of the received signal introduced two block squaring, the first transmitter, the block averaging, the second transmitter, the first and the are getting ready for the delivery of digital information and can be used to implement multi-channel modems with parallel multi-frequency composite orthogonal signals.

The known method of reception of parallel multi-frequency composite signal representing the sum of N mutually orthogonal harmonic subcarriers, the transmission of information each of which is synchronous method relative phase modulation, which consists in forming N pairs (the number of subcarriers consisting of parallel multi-frequency composite signal) in-phase and quadrature components of the reference channel are mutually orthogonal signals with frequencies equal to the frequencies of the respective subcarriers parallel multi-frequency composite signal, in the definition of the expectation of the provisions of the bounds of the elements of the signals transmitted on subcarriers in the calculation of the inside of these boundaries on the length of the interval of orthogonality of subcarriers (T exceeds the duration of the signal elements) N pairs of correlation functions Xi(t), Yi(t) taken parallel multi-frequency composite signal with said N pairs of in-phase and quadrature components of the reference channel are mutually orthogonal signals, the values of Xi,ieach of these pairs of correlation functions obtained at the end of the signal elements, the end of the previous elements of the signal, on the same subcarrier to the decision passed on this subcarrier information symbol, the Association of information symbols received on each of the subcarriers in one common thread, and the issue of information flow to the recipient.

Closest to the claimed device (prototype) is the unit receiving the parallel multi-frequency composite signal representing the sum of N mutually orthogonal harmonic subcarriers, the transmission of information each of which is synchronous method relative phase modulation [1] , containing N blocks processing of the received signal (one for each subcarriers consisting of parallel multi-frequency composite signal), the conversion unit code, the synchronization unit, and the information inputs of the N processing units of the received signal are connected together and serve as the input of the receiver, the outputs of the N processing units of the received signal are connected with the corresponding information unit code conversion, the output of which serves as the output device, the input of the synchronization unit is connected to the input device and the output of the synchronization unit connected to connected together clock inputs of the N blocks obrabot of generator-phase and quadrature components of the reference channel signal with the frequency the corresponding subcarrier frequency, which is the block processing of the received signal, two identical correlators, a casting device that provides the decision adopted on this subcarrier information symbol, and each of the N processing units of the received signal, the first information inputs of the correlators are connected together and serve as the information input unit of processing of the received signal, the second information input of the first correlator connected to the output common-mode component of the generator phase and quadrature components of the reference channel signal, the second information input of the second correlator is connected to the output of the quadrature component generator in-phase and quadrature components of the reference channel signal, the outputs of correlators connected to the corresponding information to the inputs of a casting device, the reset inputs of both correlators and the clock input of a casting device are connected together and connected to the clock input of the processing unit of the received signal, the output of a casting device serves as the output of the block processing of the received signal.

The known device receiving the parallel multi-SOS multi-frequency composite signal S(t), represent the sum of N mutually orthogonal harmonic subcarriers, the transmission of information each of which is synchronous method relative phase of the modulationwhere N is the number of orthogonal subcarriers constituting a parallel multi-frequency composite signal; U0ithe amplitude of the i-th subcarrier;i- frequency of the i-th subcarrier;i- the initial phase of the i-th subcarrier.

Subcarriers constituting the parallel multi-frequency composite signal are mutually orthogonal on the interval of time T, the duration of which does not exceed the duration of signal elements transmitted on subcarriers; for them true equalitywhere j and k are the numbers of subcarriers.

The values of the amplitudes of each of the subcarriers (nominal level) U0iset on the transmission side based on conditions provide the required noise immunity receiving information [2].

The synchronization unit is the definition of the expectation of the provisions of the bounds of the elements of the signals transmitted on the subcarriers. At the output of the synchronization unit are formed corresponding significately on subcarriers. The corresponding output signals of the synchronization unit are received at the clock inputs of the N processing units of the received signal and the transform block of code.

Parallel multi-frequency composite signal (1) is delivered to put together the information inputs of the N processing units of the received signal, in each of which the first and second correlators is the calculation of the pair correlation functions Xi(t), Yi(t) input parallel multi-frequency composite signal with in-phase uc(t) = Acosit and quadrature us(t) = Asinit components of the reference channel signals whose frequencyjcorresponds to the frequency of the subcarrier, which is the block processing of the received signal.

At the end of the signal elements Xi, Yithese correlation functions are served to the information inputs of a casting device.

Due to the orthogonality of subcarriers [1]


In the final device X

The disadvantage of the prototype-method and prototype devices are limited functionality associated with insufficient immunity receiving information, which is caused by impact on parallel multi-frequency composite signal in the communication channel selective fading [2]. As a result of their actions the level of the individual subcarriers parallel multi-frequency composite signal received at the receiver input, is reduced and as a consequence decreases the signal-to-noise ratio for the respective subcarriers, resulting in snizheniya parallel multi-frequency composite signal S(t) (1), and in the communications channel has a multiplicative disturbance K(i), which causes selective fading signal, the input receiving unit receives the signal of channel z(t)

Suppose also that in the channel on the signal in addition to the multiplicative interference effect of the additive disturbance type white noise with spectral density N0[2]. Then the signal-to-noise hiin the frequency bandioccupied by the i-th orthogonal subcarrier, estimated at

According to [2], the average error probability POshwhen transmitting binary signals by the method of relative phase modulation is approximately equal to

where f(t) - function cramp (the integral of the probability) [2].

The decrease in the i-th subcarrier of the signal-to-noise ratio of hieffects of selective fading increases the probability of errors in transmission of discrete information.

The aim of the invention is to reduce the impact of selective noise immunity of digital information in modems with parallel meema parallel multi-frequency composite signal, represent the sum of N mutually orthogonal harmonic subcarriers, the transmission of information each of which is synchronous method relative phase modulation, which consists in forming N pairs (the number of subcarriers consisting of parallel multi-frequency composite signal) in-phase and quadrature components of the reference channel are mutually orthogonal signals with frequencies equal to the frequencies of the respective subcarriers parallel multi-frequency composite signal, in the definition of the expectation of the provisions of the bounds of the elements of the signals transmitted on subcarriers in the calculation of the inside of these boundaries on the length of the interval of orthogonality of subcarriers T (T exceeds the duration of the signal elements) N pairs of correlation functions Xi(t), Yi(t) taken parallel multi-frequency composite signal with said N pairs of in-phase and quadrature components of the reference channel are mutually orthogonal signals, the values of Xi, Yieach of these pairs of correlation functions obtained at the end of the signal elements corresponding to each subcarrier, together with the values of these pairs of correlate the adoption of the decision passed on this subcarrier information symbol, the Association of information symbols received on each of the subcarriers in one common thread, and the issue of information flow to the recipient, pre-memorize the signals corresponding to the nominal level of each of the i-th subcarriers U0icalculate at the end of the signal elements using the specified values of Xi, Yieach of these pairs of correlation functions assessedthe corresponding i-th subcarrier, calculated average assessment level Uifor each i-th subcarrier on the number of sequentially received information symbols, using the obtained average level assessmentto change toonce the amplitudes of the inphase and quadrature components of the reference signals corresponding to each of the i-th subcarriers, using these new values of the amplitudes of the inphase and quadrature components of the reference signals corresponding to each of the i-th subcarriers, to accept the following signal elements.

In the pickup device of a parallel multi-frequency composite signal representing the sum of N mutually orthogonal harmonic subcarriers containing N blocks processing of the received signal (one for each subcarriers consisting of parallel multi-frequency composite signal), unit conversion code, the synchronization unit, and the information inputs of the N processing units of the received signal are connected together and serve as the input of the receiver, the outputs of the N processing units of the received signal are connected with the corresponding information unit code conversion, the output of which serves as the output device, the input of the synchronization unit is connected to the input device and the output of the synchronization unit connected to connected together clock inputs of the N processing units of the received signal and the transform block code, each of the N processing units of the received signal consists of a generator in-phase and quadrature components of the reference channel signal with a frequency corresponding to the subcarrier frequency, for the reception which is the block processing of the received signal, two identical correlators, a casting device that provides the decision adopted on this subcarrier information symbol, and each of the N processing units of the received signal, the first information inputs of the correlators are connected together and are information input unit of processing of the received signal, the outputs of correlators connected to the corresponding Informationen together and connected to the clock input of the processing unit of the received signal, the output of a casting device serves as the output of the block processing of the received signal entered into the composition of each of the N processing units of the received signal two block squaring, connected in series, the first transmitter, the block averaging, the second transmitter, the first memory block and two block multiplication, the second memory block; and clock inputs of blocks squaring the first and second calculators, block averaging and the first memory block are connected together and connected to the clock input of the processing unit of the received signal, the first inputs of multiplier units are connected together and connected to the output of the first memory block, the second input of the first block multiplication is connected to the output common-mode component of the generator phase and quadrature components of the reference channel signal, the output of the first block multiplication is connected to the second information input of the first correlator, a second input of the second block multiplication is connected to the output of the quadrature component generator in-phase and quadrature components of the reference channel signal, the output of the second block multiplication is connected to the second information input of the second correlator, the output of the second memory block is connected to the second and the first correlator, the information input of the second block squaring connected to the output of the second correlator, the first and second information inputs of the first transmitter connected respectively to the outputs of the first and second blocks squaring.

So, after defining the mathematical expectation of the provisions of the bounds of the elements of the signals transmitted on subcarriers within these bounds on the duration of the interval of orthogonality of subcarriers T (T exceeds the duration of the signal elements) is calculated as N pairs of correlation functionsi(t), Yi(t) taken parallel multi-frequency composite signal z(f) with said N pairs of in-phase and quadrature components of the reference channel are mutually orthogonal signals. At the end of the signal elements is read the value of Xi, Yieach of these pairs of correlation functions


where uc(t) = Acosit and us(t) = Asinit - respectively in-phase and quadrature components of the reference signal corresponding to the i-th subcarrier.

Due to the orthogonality of subcarriers [1]
icorresponding to the i-th subcarrier received from the channel to the input of the receiver.


Perform averaging calculated in accordance with (10) estimates of the level Uifor each i-th subcarrier on the number of sequentially received information symbols used the average level assessmentto change toonce the amplitudes of the inphase and quadrature components of the reference signals corresponding to each of the i-th subcarriers, using these new values of the amplitudes of the inphase and quadrature components of the reference signals corresponding to each of the i-th subcarriers, to accept the following signal elements. Parameters averaging estimates of the level Uisubcarriers is determined by the duration of the signal elements, p is the following recommendations for their selection is given in [2].

So, let's assume that due to selective fading i-th subcarrier parallel multi-frequency composite signal in a number of successively received signal elements level of this subcarrier remains unchanged and is estimated by the value calculated according to the formula (10). Averaging these estimates, we get the value ofequal

The specified average rating level of the i-th subcarrieris used to modify the amplitudes of the inphase and quadrature components of the reference signals corresponding to a given i-th subcarrier intimes

At the subsequent reception of the signal elements using new, changed toonce the values of the amplitudes of the inphase and quadrature components of the reference signals corresponding to each of the i-th subcarriers. By substituting the corresponding values of the amplitudes of the reference signals in the expression (8A, 8b), we get:


therefore, there is a compensation action selective interference, the values of Xi, Yieach and every one of the mentioned N pairs of in-phase and quadrature components of the reference channel are mutually orthogonal signals, received end of the signal elements are not dependent on the gain channel K(i); therefore, increases the immunity of the reception parallel multi-frequency composite signal under selective interference.

The change of the amplitudes referred to in-phase and quadrature components of the reference channel are mutually orthogonal signals, it is advisable to realize in moments of time corresponding to the expected position of the boundaries of the elements of the signal transmitted on subcarriers.

Thus, the claimed technical solution has the following distinctive features.

1. Pre-memorize the signals corresponding to the nominal level of each of the i-th subcarriers U0icalculate for each of the subcarriers at the end of the signal elements, using the specified values of Xi, Yieach of these pairs of correlation functions assessedthe corresponding i-th subcarrier. This feature allows you to identify the difference of the levels of signals received from the nominal value.

2. Average calculated evaluation level Uifor each i-th subcarrier on the number of D/img_data/61/614994.gif">to change toonce the amplitude of the inphase and quadrature components of the reference signals corresponding to each of the subcarriers using these new values of the amplitudes of the inphase and quadrature components of the reference signals corresponding to each of the i-th subcarriers, to accept the following signal elements. This characteristic reveals a strong tendency of distinction of the level of the received subcarrier from the nominal, which is the consequence of selective interference; allows changing amplitudes of the reference signals so that when you receive the following signal elements was used to compensate for the action of selective interference, which increases the robustness of reception of the information in terms of the selective interference.

3. Each of the N processing units of the received signal, comprising the device receiving the parallel multi-frequency composite signal, introduced two block squaring, connected in series, the first transmitter, the block averaging, the second transmitter, the first memory block and two block multiplication, the second memory block that in the above combination and interrelation allows to compensate geomech.

Based on the above it is clear that the claimed technical solution has significant differences.

In Fig.1 is a diagram of the device receiving the parallel multi-frequency composite signal consisting of N processing units of the received signal 1.1. . . 1.N (one for each of subcarriers comprising signal 1.1...1.N (one for each subcarriers consisting of parallel multi-frequency composite signal), the conversion unit code 2, the synchronization unit 3, and the information inputs of the N processing units of the received signal 1.1...1.N are connected together and serve as the input of the receiver 4, the outputs of the N processing units of the received signal 1.1. . .1.N connected to respective information input conversion unit code 2, the output of which serves as the output device 5, the input of the synchronization unit 3 is connected to the input device 4, and the output of the synchronization unit 3 are connected together to the United clock inputs of the N processing units of the received signal 1.1...1.N and conversion unit code 2. In Fig. 2 presents the scheme of the i-th block processing of the received signal intended for reception of the i-th sub-carrier, consisting of a generator in-phase and quadrature components of the reference channel signal i.6, but two United first transmitter i. 12, block averaging i.13, the second transmitter i.14, the first memory block i. 15, and two multiplier units i.16, i.17 the second memory block i. 18, with the first informational inputs of correlators i.7, i.8 are connected together and serve as the information input unit of processing of the received signal, the output of the correlator i.7 is connected to the coupled together first information input of a casting device i.9 and the input of the first block squaring i. 10, the output of the correlator i.8, connected to connected together to the second information input of a casting device i.9 and the input of the second block squaring i. 11, the reset inputs of both correlators i.7, i.8, the clock inputs of a casting device i. 9, the first block squaring i.10, the second block squaring i.11, the first transmitter i.12, block averaging i. 13, the second transmitter i.14 and the first memory block i.15 are connected together and connected to the clock input of the processing unit of the received signal, the output of a casting device i.9 is the output of the block processing of the received signal, the first inputs of both multiplier units i.16 and i.17 are connected together and connected to the output of the first memory block i.15, the second input of the first block multiplication i. 16 is connected to the output common-mode component of the i gene.16 is connected to the second information input of the first correlator i. 7, the second input of the second block multiplication i.17 is connected to the output of the quadrature component generator in-phase and quadrature components of the reference channel signal i.6, the output of the second block multiplication i.17 is connected to the second information input of the second correlator i.8, the output of the second memory block i.18 is connected to the second information input of the second transmitter i.14. The device of the remaining (N-1) blocks the processing of the received signal, comprising the device receiving the parallel multi-frequency composite signal, in the same way.

The work of the proposed method lies in the consistent implementation of the inventive device the following operations:
1. Previously, on the basis of the desired noise transfer information, determines necessary to ensure that such noise is signal-to-noise ratio at the receiving end and, accordingly, the nominal value U0ilevels of subcarriers constituting a parallel multi-frequency composite signal. The appropriate method of determining the required values of the signal-to-noise ratio at the point of reception and the nominal values U0ilevels of subcarriers is given in [2].

Values U0ithe nominal levels of the subcarriers in the signal processing, numbers that match the numbers of the respective subcarriers in parallel composite signal.

2. Form N pairs (the number of subcarriers consisting of parallel multi-frequency composite signal) in-phase and quadrature components of the reference channel are mutually orthogonal signals with frequencies equal to the frequencies of the respective subcarriers parallel multi-frequency composite signal.

These operations are performed in each of the signal processing units using a generator in-phase and quadrature components of the reference channel signal i.6. The generators of i.6 is formed at its outputs in-phase uc(t) = Acosit and quadrature us(t) = Asinit components of the reference channel signal with a frequency ofirespectively. Frequencyiin-phase and quadrature components of the reference channel signal generated by the generator i. 6, corresponds to the frequency of the subcarrier, which is the i-th block of the signal processing.

3. Determine the expectation of the provisions of the bounds of the elements of the signals transmitted on subcarriers.

This operation in the fishing, ensuring the functioning of the device components.

4. Calculate inside of these boundaries on the length of the interval of orthogonality of subcarriers (T exceeds the duration of the signal elements) N pairs of correlation functions Xi(t), Yi(t) taken parallel multi-frequency composite signal with said N pairs of in-phase and quadrature components of the reference channel are mutually orthogonal signals.

These operations are performed in each of the signal processing units, respectively, the first i.7 and the second i.8 correlators.

5. Use the value of Xi, Yieach of these pairs of correlation functions obtained at the end of the signal elements corresponding to each subcarrier, together with the values of each of these pairs of correlation functions, obtained on the same subcarrier in the moments of the completion of a number of previous elements of the signal, for deciding passed on this subcarrier information symbol.

These operations are performed in each of the blocks of the signal processing deciding unit i.9, the first i.7 and the second i.8 correlators. The corresponding signal arriving at the clock input of a casting device i.9 of block C is mwale by joint processing of these values of Xi, Yicorrelation functions entering the first and second information inputs casting device i.9 from the first i.7 and the second i.8 correlators; and corresponding to the first i.7 and the second i.8 correlators; and the corresponding values of the correlation functions calculated in the previous elements of the signal. The decision is made by one of the known methods, for example by the method of comparing phases or method of comparing the polarities [2] . Adopted information symbol from the output of a casting device i.9 is output corresponding to the i-th signal processing unit and further to the corresponding information input unit conversion code 2. After actuation of a casting device 1.9 the corresponding signal from the synchronization unit 3 is input to the reset input of the first i.7 and the second i.8 correlators each of the signal processing units, to reset these correlators. Then the correlators i.7 and i.8 ready to process the next element in the signal.

6. Combine information symbols received on each of the subcarriers in one common thread and give this information flow to the recipient.

This operation is performed in the conversion unit code 2 on the corresponding signal, the settlement of the TCI signals in parallel form are placed on the relevant information input conversion unit code 2, converted it into a serial type, and served on the output device 5.

7. Calculate at the end of the signal elements using the specified values of Xi, Yieach of these pairs of correlation functions assessedthe corresponding i-th subcarrier, calculated average assessment level Uifor each i-th subcarrier on the number of sequentially received information symbols used the average level assessmentto change toonce the amplitude of the inphase and quadrature components of the reference signals, corresponding to each i-th subcarrier, using these new values of the amplitudes of the inphase and quadrature components of the reference signals, corresponding to each i-th subcarrier, to accept the following signal elements.

These operations are performed in each of the channels signal processing using two blocks squaring i.10, i.11, the first transmitter i.12, block averaging i.13, the second transmitter i.14, the first memory block i.15, two multiplier units i.16, i.17, the second memory block i.18. The corresponding signal received from the synchronization unit 3 in square i. 10, i.11, the first transmitter i.12, block averaging, the second transmitter i.14, the first memory block i.15, simultaneously with the decision passed on this subcarrier information symbol in the first and second blocks squaring i.10, i.11 carry out the calculation of the squares of Xi2, Yi2these values of Xi, Yieach of these pairs of correlation functions, of which the first transmitter i.12 estimation of levelthe i-th subcarrier. Formed in the first computer i.12 on the number of sequentially received information symbols assess the level Uithe i-th sub-carrier averaging unit averaging i.13. The length of the interval on which to perform the averaging of estimates of level, is determined by the duration of signal elements transmitted on subcarriers, and the rate of change of channel parameters during selective fading; appropriate recommendations for their selection is given in [2]. The result of the averaging of estimatesfrom the output of block averaging i.13 is served on the first information input of the second transmitter i. 14, the second information input of the second transmitter i. 14 from the second memory block i.18 bodyvette with formula (12) is calculated correction factor for changes inonce the amplitude of the inphase and quadrature components of the reference signals corresponding to the i-th subcarriers. Values of the correction coefficientwith the release of the second transmitter i.14 is written into the first memory block i.15, the output of which values of the correction coefficientserved on United together second input of the first i.16 and the second i.17 multiplier units. At the first input of the first block multiplication i.16 from the output of the generator i. 6 in-phase and quadrature components of the reference channel signal are in-phase uc(t) = Acosit component of the reference channel signal with a frequency ofi. To the first input of the second block multiplication i.17 from the output of the generator i. 6 in-phase and quadrature components of the reference channel signal is quadrature us(t) = Asinit component of the reference channel signal with a frequency ofi. Frequencyiin-phase and quadrature components of the reference channel signal generated by the generator i.6, corresponds to the frequency of the subcarrier, which is designed Diya formed in-phase and quadrature components of the reference channel signal, amplitude of which is equal to. In-phase component of the reference channel signal output from the first block multiplication i.16 is supplied to the second information input of the first correlator i. 7; a quadrature component of the reference channel signal output from the second block multiplication i.17 is supplied to the second information input of the second correlator i. 8 and used in the processing of the following elements of the signal. If, as a result of selective fading, there is a change of level of the corresponding subcarrier, that is his compensation as a result of executing the sequence of operations described above. In this case, the correction of the amplitude of these in-phase and quadrature components of the reference channel signal, it is advisable to realize in time that coincides with the mathematical expectation of the position of boundaries of elements of the received signal.

Similarly, the processed signals in the remaining (N-1) blocks the processing of the received signal, comprising the device receiving the parallel multi-frequency composite signal.

The blocks included in the inventive device, known in the art. For its realization can be ispolzovanie square i.10, i.11, the first transmitter i.12, the block averaging i.13, the second transmitter i.14 can be performed on the basis of the arithmetical and logical unit (ALU). Examples of the construction of these blocks on the basis of the ALU is shown in [3]. The first memory block i.15 may be implemented as a parallel case, examples of the implementation of the parallel registers is given in [3].

For the implementation of the multiplier units i.16, i.17 you can use the multiplied digital to analog converters. Examples are multiplied digital to analog converters and implementation based on them are multiplied blocks is shown in [3].

The second memory block i.18 may be performed based on a persistent storage device, examples of construction of devices of this type are described in [3] .

There are other possible execution of these blocks. If the signal processing device receiving the parallel multi-frequency composite signal is in analog form, with examples of execution blocks squaring i.10, i.11, the first transmitter i.12, block averaging i.13, the second transmitter i.14, the first memory block i.15, blocks the multiplication i.16, i.17, and the second memory block i.18 on the basis of the analog elements can be found in [3].

Sources of information
RIA telecommunications: Textbook for universities / A., Zuko, D. D. Klovsky, V. I. Korzhik, M. C. Nazarov. Ed. by D. D. Klovsky.-M.: Radio and communication, 1998.

3. Titze U. , Schenk, K. Semiconductor circuitry. The reference manual. / Lane. with it. - M.: Mir, 1982.


Claims

1. The method of parallel multi-frequency composite signal representing the sum of N mutually orthogonal harmonic subcarriers, the transmission of information each of which is synchronous method relative phase modulation, which consists in forming N pairs (the number of subcarriers consisting of parallel multi-frequency composite signal) in-phase and quadrature components of the reference channel are mutually orthogonal signals with frequencies equal to the frequencies of the respective subcarriers parallel multi-frequency composite signal, in the definition of the expectation of the provisions of the bounds of the elements of the signals transmitted on subcarriers in the calculation of the inside of these boundaries on the length of the interval of orthogonality of subcarriers (T exceeds the duration of the signal elements) N pairs of correlation functions Xi(t), Yi(t) taken parallel multi-frequency composite signal with said N pari values of Xi, Yieach of these pairs of correlation functions obtained at the end of the signal elements corresponding to each subcarrier, together with the values of these pairs of correlation functions obtained at the end of the previous elements of the signal on the same subcarrier to the decision passed on this subcarrier information symbol, the Association of information symbols received on each of the subcarriers in one common thread, and the issue of information flow to the recipient, wherein the pre-memorize the signals corresponding to the nominal level of each of the i-th subcarriers U0icalculate at the end of the signal elements using the specified values of Xi, Yieach of these pairs of correlation functions assessment of the level

the corresponding i-th subcarrier, calculated average assessment level Uifor each i-th subcarrier on the number of sequentially received information symbols used the average level assessmentto change toonce the amplitudes of the inphase and quadrature components of the Oh and quadrature components of the reference signals, corresponding to each i-th subcarrier, to accept the following signal elements.

2. The method of parallel multi-frequency composite signal under item 1, characterized in that the change of the amplitudes of the inphase and quadrature components of the reference signals is carried out in the moments of time corresponding to the expected position of the boundaries of the elements of the signals transmitted on subcarriers.

3. The device receiving the parallel multi-frequency composite signal representing the sum of N mutually orthogonal harmonic subcarriers, the transmission of information each of which is synchronous method relative phase modulation containing the N processing units of the received signal (one for each subcarriers consisting of parallel multi-frequency composite signal), the conversion unit code, the synchronization unit, and the information inputs of the N processing units of the received signal are connected together and serve as the input of the receiver, the outputs of the N processing units of the received signal are connected with the corresponding information unit code conversion, the output of which serves as the output device, the input of the synchronization unit, connected to the input device, and Vala and conversion unit code each of the N processing units of the received signal consists of a generator in-phase and quadrature components of the reference channel signal with a frequency corresponding to the subcarrier frequency, which is the block processing of the received signal, two identical correlators, a casting device that provides the decision adopted on this subcarrier information symbol, and each of the N processing units of the received signal, the first information inputs of the correlators are connected together and serve as the information input unit of processing of the received signal, the outputs of correlators connected to the corresponding information to the inputs of a casting device, the reset inputs of both correlators and the clock input of a casting device are connected together and connected to the clock input of the processing unit of the received signal, the output of a casting device serves as the output of the block processing of the received signal, characterized in that the composition of each of the N processing units of the received signal introduced two block squaring, connected in series, the first transmitter, the block averaging, the second transmitter, the first memory block and two block multiplication, the second the Deposit and the first memory block are connected together and connected to the clock input of the processing unit of the received signal, the first inputs of both multiplier units are connected together and connected to the output of the first memory block, the second input of the first block multiplication is connected to the output common-mode component of the generator phase and quadrature components of the reference channel signal, the output of the first block multiplication is connected to the second information input of the first correlator, a second input of the second block multiplication is connected to the output of the quadrature component generator in-phase and quadrature components of the reference channel signal, the output of the second block multiplication is connected to the second information input of the second correlator, the output of the second memory block is connected to the second information input of the second transmitter, the information input of the first block squaring connected to the output of the first correlator, the information input of the second block squaring connected to the output of the second correlator, the first and second information inputs of the first transmitter connected respectively to the outputs of the first and second blocks squaring.

 

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The invention relates to a receiving device and method for communication systems

The invention relates to a device and method of coding for mobile communications and more particularly to a device and method for producing the Quaternary complex quasiorthogonal codes and further use of these developed Quaternary complex quasiorthogonal codes to generate signals channel expansion

The invention relates to the field of radio and may find application in communication systems

FIELD: radio engineering.

SUBSTANCE: suggested algorithm for quasi-coherent receipt of multi-beam signal with continuous pilot signal is based on algorithm, adaptive to freeze frequencies, for estimation of complex skirting curve, which uses both pilot and information signal. Use of information symbols for estimation of complex skirting curve allows, with weak pilot signal, to substantially increase precision of estimation of said curve and, as a result, significantly decrease possible error of information parameters estimation.

EFFECT: higher interference resistance.

2 cl, 10 dwg

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