Improved method and apparatus for performing search occurrences in the communication system with mdr

 

The invention relates to spread spectrum communications, and relates to a method and device to perform the search entry in the system spread spectrum communications. The way to view large window hypotheses of bias item pseudotumor (PN) signal, and hypotheses offset generated by the generator PN sequence under the control of the controller search device. This is the energy of the compressed sequence, which is compressed by the sphincter, and finding determine the presence of the pilot signal to a threshold device having one of the displacements at the element signal of the large search window, then under the control of the controller, the search device searches for the subset of hypotheses bias or small window. The technical result achieved by the invention is to reduce the time required for the search entry in the communication in the mobile communication system. 3 S. and 17 C.p. f-crystals, 5 Il.

The present invention relates to spread spectrum communications. More specifically the present invention relates to a new and improved method and device for joining [link] in the communication environment with the advanced spectate one of several methods to facilitate communications, in which there are a large number of system users. The prior art and other methods for communication systems, multiple access, such as multiple access with time division (mdvr) (CDMA) and multiple access frequency division (FDMA equipment) (FDMA). However, the method of modulation mdcr spread spectrum has significant advantages over other methods of modulation for communication systems with multiple access. The use of the method mdcr in communication systems, multiple access is described in U.S. patent 4901307, issued February 13, 1990, entitled "communication System with multiple access spread spectrum using satellite or terrestrial repeaters", owned by the applicant of the present invention, the disclosure of which is incorporated here by reference.

Mdcr, being inherently broadband signal, offers frequency diversity by spreading the signal energy over a wide band of frequencies. Therefore, frequency selective fading affect only a small proportion of the bandwidth of the signal mdcr.

Separation in space or on the paths obtained by providing multiple signal paths through simultaneous linity using mnogotraslevoe environment through processing spread spectrum, allowing to separately receive and process signals with different propagation delays. Examples of usage explode on paths are illustrated by U.S. patent 5101501, issued may 31, 1992, entitled "Soft transfer [link] in the cellular telephone system mdcr", and U.S. patent 5109390, issued April 28, 1992, entitled "Receiver with diversity in a cellular telephone system mdcr", both of these patents are owned by the applicant of the present invention and is incorporated here by reference.

Harmful effects of fading can to some extent be controlled in the system mdcr by controlling the transmit power. System for power control cell site and mobile unit is seen in U.S. patent 5056109, issued October 8, 1991, entitled "Method and apparatus for controlling transmit power in a cellular mobile telephone system mdcr", on the application 07/433031, filed November 7, 1989, also owned by the applicant of the present invention. The use of the method mdcr in the communication system with multiple access is considered further in U.S. patent 5103459, issued April 7, 1992, entitled "System and method for generating waveforms in a cellular telephone system mdcr", etc is mentioned patents describe the use of the pilot signal, used for entry. Using the pilot signal allows the mobile station in a timely manner to enter the local communication system base station. The mobile station receives the timing information and information about the relative signal strength of a received pilot signal.

In an ideal system, where the setup time of the equipment is zero, the ideal would be a search box, consisting of a single hypothesis. However, due to the fact that it takes time to adjust equipment to conduct the search, hypotheses are tested. The longer the time required to configure the equipment, the greater the required size of the window. In complex systems requires a search device for searching the Windows of many hypotheses, and when appropriate synchronized sequence it will repeat the search in this window a predetermined number of times to confirm synchronization. This process requires an unacceptably long time occurrences. The present invention provides a method and apparatus for reducing the time required for occurrence of the pilot signal in a mobile communication system.

The present invention represents a new and improved method and apparatus that reduce the time of entering the time of entry by accelerating search methodologies without imposing excessive penalties for improper entry.

The present invention provides a method of determining synchronization of the PN sequence in the communication system with the extended scope and sequence for direct modulation of the carrier containing operations: computing the first set of energy values of the correlation signal for the first set shifting in time PN sequences; comparison mentioned in the first set of energy values of the correlation signal with the first threshold value; selecting a second set of PN sequences in accordance with said first set of energy values of the correlation signal; computing a second set of energy values of the correlation signal for the said second set of PN sequences, and mentioned a second set of PN sequences is a subset of the aforementioned first set of PN sequences; and selection mentioned synchronized PN sequence of the said second set of PN sequences in accordance with said second set of energy values of the correlation signal.

The method also further comprises the comparison operation mentioned second set of energy values of the correlation signal with the second threshold value.

Ostroda to receive the first control signal for outputting the set of all sequences demodulation in response to the aforementioned control signal; a demodulator for receiving the aforementioned received signal and for demodulating a received signal in accordance with the set of all sequences demodulation for the issuing of multiple compressed signals; a correlator for receiving the said set of compressed signals and for calculating energy values of the correlation signal for the said set of compressed signals; a controller search device for receiving the above-mentioned energy values of the correlation signal, and for issuing the mentioned first control signal and for issuing a second control signal in accordance with said energy values of the correlation signal; in which the said generator is further for receiving the mentioned second control signal and for issuing a second set of demodulation sequences in response to the mentioned second control signal, while the aforementioned second set of sequences demodulation is a subset of the first mentioned set of sequences demodulation.

System to select the synchronized sequence demodulation containing
the generator sequences to the input for receiving the first control signal and output;
the demodulator to the input pluciennik referred to the output of the demodulator, and with the release; and
the search controller devices with input connected to said output of the correlator.

Brief description of drawings
The features, objectives and advantages of the present invention will become clearer from the detailed following description, taken together with the drawings in which the same reference position mean one and the same on all drawings.

Fig.1 is a block diagram of the present invention.

Fig.2 is an illustration of the sweep energy offsets in time for the element signal for a fixed window.

Fig. 3 is a block diagram of the algorithm, representing an embodiment of the search algorithm with a fixed window size.

Fig.4 is an illustration of the sweep energy offsets in time for the element signal for a scalable window according to the present invention.

Fig. 5 is a block diagram of the algorithm, representing an embodiment of a scalable window according to the present invention.

In the system of spread spectrum communications to synchronize the phase and frequency of the mobile station to the transmission base station uses the pilot signal. In an exemplary implementation of a system of spread spectrum communications is a communication system with advanced spectre USA 5056109 and U.S. patent 5103459. In the communication system with extended range and sequence for direct modulation of the carrier wave transmitted signals are distributed over the frequency range greater than the band necessary for transmission of information through the modulation of the carrier wave signal data, then re-modulation of the resulting signal, distributed in a wide band of frequencies. In the pilot-signal data can be considered as a sequence of all ones.

Advanced signal is usually generated by a shift register with linear feedback, the implementation of which is described in detail in the aforementioned patents. Advanced signal can be considered as a rotating vector on the complex plane in the form:
s(t) = Ae-t+f. (1)
For entry into the communication mobile station must be synchronized for the adopted from the base station signals as phase f and the frequency. The purpose of the work of the search device to find the phase f of the received signal. After finding phase f distributed signal frequency is using demodulateur element that has the equipment the signal, is the test set of phase hypotheses, called the window, and in determining whether the right is one of the prospective phase of hypotheses, called the hypothesis offset.

Refer now to the drawings. Fig.1 represents a device according to the present invention. At power-up signal with the spread spectrum is received by the antenna 2. The purpose of the device is increased synchronization between pseudocumene (PN) sequences generated by the generator 20 PN sequence and the received signal spread spectrum, which is extended identical PN sequences of unknown phase.

In an exemplary implementation and modulator, which extends the pilot signal and the PN generator 20 are shift registers maximum length, which generates a PN code sequence, respectively, for expansion and contraction of the pilot signal. Thus, the operation of achieving synchronization between the codes used to compress the received pilot signal, and PSH extended code of the received pilot signal includes determining the time offset shift register.

The signal spread spectrum is served by the antenna 2 to the receiver 4. The receiver 4 lowers the frequency of the signal which has been created PSH generator 20. Due to similarity of the PN codes with random noise piece PN code and the received signal should be almost zero, except for the synchronization point.

However, due to the lack of synchronization item-level signal and made noise this is not the case that gives the increase situation of false alarm, when the mobile station may assume that it has successfully captured the pilot signal, but actually it is not. In order to give greater certainty to the specified condition for successful capture, the check is repeated several times. The number of repetitions of the test is determined by the controller 18 of the search device. The controller 16 search device may be performed in hardware using a microprocessor or microcontroller, or in contrast programmatically.

The controller 18 search device delivers the hypothesis bias on the PN generator 20. In an exemplary implementation of a received signal modulated by quadrature phase shift keying (Kfmn) (QPSK), so that PN generator delivers on the pressure element 6 PN sequence for the component in-phase (I) modulation and a separate sequence for component quadrature (Q) modulation. Compressive element 6 penuh components into a coherent drives 8 and 10.

Coherent drives 8 and 10 summarize the work on the length of the sequence works. Coherent drives 8 and 10 respond to signals from the controller 18 search device to reset, fixing and installation period summation. The amount of pieces served with adders 8 and 10 on the Quad splitter 12. The squarer 12 squares each of the sums and sums the squares between them.

The sum of squares is served by Quad 12 on the non-coherent accumulator 14. Non-coherent accumulator 14 determines the value of the energy output Quad 12. Non-coherent accumulator 14 serves to counteract the effects of differences in frequency between the transmitted clock signals of the base station and the received clock signal of the mobile station and helps in statistics detections in an environment with fading, if it is known that the frequency of the two clock signals are the same and that deep fading no, the ideal approach would be to integrate the sequence throughout the period of accumulation in the form:

where PNI(n) and PNQ(n) can be equal to1.

If, however, there is a probability of the frequency mismatch or fading, then the correlator donates part statistics>
The controller 18 search device takes the value m on the non-coherent accumulator 14.

Incoherent drive 14 sends a signal energy to the tool 16 comparisons. The tool 16 comparison compares the energy value with a preset threshold, filed by the controller 18 of the search device. The results of each comparison are served then back to the controller 18 of the search device. The controller 18 search device checks the comparison and determines whether the window probable candidates for the correct offset, then the window is visible again in accordance with the method used in a scalable window.

To illustrate benefits from use of the method scalable Windows, is an example of a method of using a fixed window size. Fig.2 represents a graph of scan energy values for the hypotheses temporary position element signal. In an exemplary implementation, the box contains 56 hypotheses of the position of the signal. The box represents the use of the test with a two-level threshold. The observed thresholds are the detection threshold and the threshold confirmation.

Fig. 3 is a conventional method used to view Windows with a fixed number of Giotto comparison, shown on Fig.2. If the window is "viewed" and there is no energy hypothesis does not exceed the detection threshold (TNM) unit 42, the controller 18 search device will see the next window unit 47 and the block 40.

However, if the calculated energy curve are points that exceed the detection threshold (TNM), the algorithm proceeds to the stage of confirmation in block 44. In block 44 the same large window visible again and this time the calculated energy is compared with a lower threshold value, the verification threshold (THV). If in block 42 detected maximum energy does not exceed the threshold, then in block 47 and 40 is viewed following a large window. The algorithm then proceeds to block 48, which determines whether there was a confirmation for twenty consecutive Windows. If held less than N checks confirm, where N is for example equal to twenty, then the algorithm proceeds to block 44, and a large window visible again. However, after N consecutive successful tests confirm it is determined that the pilot signal is captured.

Refer now to Fig.4, where curve calculated energy and demonstrates the use of a scalable window on the tests hypotheses in a smaller set near hypotheses, which gave rise to the detected peak.

In Fig.5 shows the block diagram of the algorithm of the method in the search device according to the present invention. In an improved method according to the present invention uses the three-step method of entry. In block 80 is viewed by a large window. The controller 18 search device checks for the results of the comparison to determine whether the peak is greater than the detection threshold (TNM). If not detected peak is higher than TNM, the algorithm returns to block 80, and is viewed in a new window.

When a large window is the peak of more than TNM, the algorithm proceeds to block 84. At this point, you only view on a smaller set of hypotheses around the detected peak. This smaller set of hypotheses is shown in Fig. 4 as a small window. Using a small window for the second test is intended to reduce the time of occurrence by a significant reduction in time to check for a false alarm, i.e., the state in which the movable block is confident that it has entered into a phase, whereas in fact it is not. The time spent to perform this second check is reduced in proportion to the ratio between the number of hypotheses in a smaller window and the number of the ISU is the claim are non-coherent accumulation.

Then, in block 86, if the energy is greater than the detection threshold 2 (TM), the search is in the stage of confirmation. If there is no power greater than the threshold TNM, the algorithm returns to block 80 and searches in a new larger window.

If in block 86 is determined that there is a calculated energy value is greater than the threshold 2 (TM), the algorithm proceeds to block 88. There are three conditions under which stops the confirmation: (1) failure to view the Vftimes, (2) estimation of the frequency twice gives the same value from one 100-millisecond countdown to the next, or (3) determined that the pilot signal is captured. When the confirmation signal at the peak of the demodulated. In block 88 the received signal is demodulated in accordance with the hypothesis of the peak. The results of the demodulated signal is analyzed to determine recorded whether they, and if so, the entry is made. If the demodulated results indicate that the signal is not recorded, the algorithm proceeds to block 92.

In block 92 the calculated energy values for a small window is compared with a threshold value confirmation (THV). If in block 92 in a small box are the calculated values of energy, which offset is m, the algorithm proceeds back to block 88 and is repeated as described previously.

If in block 92 in a small box no calculated energy values that exceed the threshold, the algorithm proceeds to block 96, where the account is increased by 1 and the algorithm then returns to block 98, which checks whether the failed twice in a row validation confirmation. If the assertion check failed Vftimes in a row, the algorithm proceeds to block 80, and is viewed a new large window. If the validation confirm successful twice in a row, the algorithm proceeds to block 88, and the operation continues as described previously.

The description of the preferred executions are intended to enable any person to make or use the present invention. Various modifications of these executions will be immediately clear to the specialists, as defined here, the original principles can be applied to other executions without using the invention. Thus, the present invention is not intended to limit shown here runs, but is consistent with the widest extent consistent with these principles and new features.


Claims

1. The way vapour values of the energy correlation of the received signal in accordance with the first set pseudotumour (PN) sequences; comparing the first set of energy values of the correlation signal with the first threshold value and selecting a second set of PN sequences in accordance with the first set of energy values of the correlation signal exceeds a first threshold value; calculating a second set of energy values of the correlation signal for a received signal in accordance with a second set of PN sequences, while the second set of PN sequences is a subset of the first set of PN sequences and the selection of the synchronized PN sequence from the second set of PN sequences in accordance with said second set of energy values of the correlation signal.

2. The method according to p. 1, characterized in that it includes a step of comparing the second set of energy values of the correlation signal with the second threshold value.

3. The method according to p. 1, characterized in that it includes a step of receiving and lowering the frequency of the broadcast signal, for receiving a received signal.

4. The method according to p. 3, characterized in that the step of calculating the first set of energy values of the correlation of a received signal includes the steps of: compressing a received signal in accordance with each PN sequence of the first set is ASCII signal for each of the compressed signal of the first set of compressed signals.

5. The method according to p. 1, characterized in that it includes a step of forming a first set of PN sequences.

6. The method according to p. 5, characterized in that the step of forming the first set of PN sequences contains the following phases: phase supply control signal and forming a PN sequence of the first set of PN sequences in accordance with the control signal.

7. The method according to p. 6, characterized in that the control signal is a temporary shift and the step of forming the PN sequence includes the removal PX sequence of the shift register in accordance with a time shift.

8. The method according to p. 1, wherein the first set of PN sequences contains quadrature PN sequenceIand PNQ.

9. The method according to p. 8, characterized in that the step of calculating the first set of energy values of the correlation of a received signal contains the following stages: compression component I and component Q of the received signal by PNIand PNQsequences to ensure proper compressed components I and Q of the received signal; a coherent accumulation of compressed I components of the received signal to provide the accumulated faced the square of each of the accumulated component I and Q accumulated component and the sum of the squares of the components of accumulated and incoherent addition of the sum of the squares of the accumulated I and Q components.

10. The method according to p. 1, characterized in that the received signal is a pilot signal.

11. Device for the search entry in the communication in the communication system with mdcr containing the generator sequences for receiving the first control signal and for issuing a first set of demodulation sequences in response to the control signal; a demodulator for receiving a received signal, demodulation in accordance with the set of all sequences demodulation and for the issuing of multiple compressed demodulated signals; a correlator for receiving multiple compressed demodulated signal and calculating energy values of the correlation signal for a variety of compressed demodulated signals; the search controller device for receiving energy values of the correlation signal and for issuing a first control signal and for issuing a second control signal in accordance with the energy values of the correlation signal, and the generator sequence is designed to receive the second control signal and for issuing a second set of demodulation sequences in response to the second control signal, while the second set of sequences demodulation is a subset of the first set is the drive to receive multiple compressed demodulated signals and combining the compressed demodulated signals for a predetermined duration.

13. The device according to p. 11, characterized in that the received signal contains the first component and the second component, while the demodulator is designed for reception and demodulation of the first component of the received signal in accordance with the first set of sequences demodulation to obtain a first set of compressed demodulated signals and demodulating the second component of the received signal in accordance with the second set of sequences demodulation to obtain a second set of compressed demodulated signals, the generator sequence demodulation is designed to generate first and second sets of sequences demodulation.

14. The device according to p. 13, wherein the correlator includes a first memory for receiving the first set of compressed demodulated signals and for summing each compressed demodulated signal from the first set of compressed demodulated signals along the length of the sequence demodulation to obtain a first set of amounts of compressed demodulated signals; a second memory for receiving the second set of compressed demodulated signals and for summing each compressed demodula is ulali to obtain a second set of values of sums of compressed demodulated signals; an adder for receiving and adding the first and second sets of values compressed demodulated signals to obtain the energy values of the correlation signal.

15. The device according to p. 14, characterized in that the adder includes a squarer for demodulated signals and for squaring each value of the first set of values of the compressed demodulated signals and for squaring each value from the second set of values of sums of compressed demodulated signals and for adding each squared values of the first set of squared values with a corresponding one squared value from the second set of squared values to obtain the energy values of correlation and non-coherent accumulator for receiving multiple values of the energy correlation and calculation of the energy values of the correlation signal in accordance with the set values of the correlation energy.

16. The device according to p. 15, wherein the search controller device is designed to generate a total signal responds to non-coherent accumulator.

17. System for selecting synchronized posledovatelnostyu with the controller output search device, and output; a demodulator having an input connected to the generator output sequences and output; correlator having an input connected to the output of the demodulator, and the output, and the controller retrieval device having the input connected to the output of the correlator.

18. The system under item 17, wherein the correlator is coherent drive.

19. The system under item 17, characterized in that the generator sequence has a second output and the demodulator has a second input connected to a second generator output sequence.

20. The system under item 17, characterized in that the demodulator has a second output, and the correlator contains the first coherent memory having input connected to a second output of the demodulator, and an output; a second coherent memory having input connected to a second output of the demodulator, and the output, the transmitter is the sum of the squares of the components of accumulated received signal, having a first input connected to the output of the first coherent memory, a second input connected to the output of the second coherent memory, and the output and the non-coherent memory having input connected to the output of the transmitter is the sum of the squares of the accumulated components of the received signal.

 

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