CN111446984A - Single carrier phase rapid correction method and device - Google Patents

Single carrier phase rapid correction method and device Download PDF

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CN111446984A
CN111446984A CN202010146264.3A CN202010146264A CN111446984A CN 111446984 A CN111446984 A CN 111446984A CN 202010146264 A CN202010146264 A CN 202010146264A CN 111446984 A CN111446984 A CN 111446984A
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frequency offset
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CN111446984B (en
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熊军
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XI'AN YUFEI ELECTRONIC TECHNOLOGY Co.,Ltd.
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/69—Spread spectrum techniques
    • H04B1/707—Spread spectrum techniques using direct sequence modulation
    • H04B1/7073—Synchronisation aspects
    • H04B1/7087—Carrier synchronisation aspects
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/69—Spread spectrum techniques
    • H04B1/707—Spread spectrum techniques using direct sequence modulation
    • H04B1/7073—Synchronisation aspects
    • H04B1/7075—Synchronisation aspects with code phase acquisition
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/0014—Carrier regulation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2647—Arrangements specific to the receiver only
    • H04L27/2655—Synchronisation arrangements
    • H04L27/2657—Carrier synchronisation
    • H04L27/266—Fine or fractional frequency offset determination and synchronisation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/0014—Carrier regulation
    • H04L2027/0024—Carrier regulation at the receiver end
    • H04L2027/0026—Correction of carrier offset

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Abstract

The application discloses a single carrier phase rapid correction method and a single carrier phase rapid correction device. The method comprises the steps of carrying out matched filtering on data obtained by ADC sampling; after filtering is finished, carrying out burst coarse capture on the repeated synchronous head; performing initial carrier synchronization by using a preamble and a unique synchronization word to obtain an initial frequency offset and an initial phase offset; and determining the initial position of the data according to the initial frequency offset and the initial phase offset, carrying out carrier synchronization tracking on the data, carrying out tracking estimation on the frequency offset and the phase offset, compensating the data, and then carrying out despreading demodulation output. By adopting the single carrier phase rapid correction method and the single carrier phase rapid correction device, synchronous tracking under spread spectrum signals can be realized, and the problems of frequency offset correction and signal demodulation are solved.

Description

Single carrier phase rapid correction method and device
Technical Field
The present application relates to the field of communications technologies, and in particular, to a method and an apparatus for quickly correcting a single carrier phase.
Background
Modern Communication increasingly requires high efficiency and reliability, and spread spectrum Communication (spread spectrum Communication) is called spread spectrum Communication for short, and is characterized in that the bandwidth used for transmitting information is far larger than the bandwidth of the information. The spread spectrum communication technology uses spread spectrum coding to perform spread spectrum modulation at a transmitting end and uses related demodulation technology to receive information at a receiving end, and the process makes the communication technology have a plurality of excellent characteristics. Spread spectrum communication technology is an information transmission mode, and the frequency bandwidth occupied by signals is far larger than the minimum bandwidth necessary for the transmitted information; the frequency band is spread by an independent code sequence, and the spreading is realized by a coding and modulation method and is independent of the information data; at the receiving end, the same code is used for carrying out related synchronous receiving, despreading and recovering the transmitted information data.
How to implement synchronous tracking under spread spectrum signals to solve the problems of frequency offset correction and signal demodulation is now an urgent problem to be solved.
Disclosure of Invention
The application provides a single carrier phase rapid correction method, which comprises the following steps:
performing matched filtering on data obtained by ADC sampling;
after filtering is finished, carrying out burst coarse capture on the repeated synchronous head;
performing initial carrier synchronization by using a preamble and a unique synchronization word to obtain an initial frequency offset and an initial phase offset;
and determining the initial position of the data according to the initial frequency offset and the initial phase offset, carrying out carrier synchronization tracking on the data, carrying out tracking estimation on the frequency offset and the phase offset, compensating the data, and then carrying out despreading demodulation output.
The single-carrier phase fast correction method as described above, wherein the data sampled by the ADC is matched filtered by a matched filter, and the form of the matched filter depends on the form of the transmit-end shaping filter.
The single carrier phase fast correction method described above, wherein the burst coarse acquisition is performed on the duplicate synchronization header, specifically:
utilizing a repeated synchronization head to perform initial coarse synchronization;
and carrying out quick initial synchronization by using repeated spreading code periods.
The single carrier phase fast correction method described above, wherein the initial carrier synchronization is performed by using the preamble and the unique synchronization word, specifically includes:
carrying out burst fine capture by using the unique synchronous word, and finding out the accurate initial position of the unique synchronous word;
and carrying out initial carrier synchronization by using the preamble and the unique synchronization word after the accurate initial position to obtain initial frequency offset and initial phase offset.
The single carrier phase fast correction method described above, wherein the burst fine acquisition is performed by using the unique synchronization word, specifically includes the following sub-steps:
according to the found position of burst coarse capture, each preset code bias is correlated with a unique synchronous word by utilizing received data, and when a correlation peak value exceeds a threshold value, the initial position of the unique synchronous word is found;
before and after finding the initial position of the unique synchronous word, a preset number of sampling points are found as initial zone numbers, 2P +1 correlation values are calculated, the position with the maximum 2P +1 correlation value is taken as the final initial position, and fine capture is completed.
The single carrier phase rapid correction method comprises the steps of estimating the frequency offset by adopting a carrier synchronization algorithm based on frequency offset estimation and compensation, and then compensating an original signal;
calculating a frequency offset estimate by
Figure RE-GDA0002524021500000021
Comprises the following steps:
Figure RE-GDA0002524021500000022
where arg is the set and L is the total number of samples to be counted, where L is 16, r iskFor data used for estimation, f is the frequency point of the search, Tb＝1/156.25kHz；
The initial phase offset is then calculated:
Figure RE-GDA0002524021500000023
the single carrier phase fast correction method as described above, wherein the tracking estimation is performed on the frequency offset and the phase offset, specifically, the tracking estimation is performed by using unknown data during tracking, a segmented manner is adopted, when a full segment of data is received and stored, the frequency offset and the initial phase offset of the segment of data are estimated again, and the frequency offset of the segment of data is corrected according to the estimated value; when the next segment of data is full, the process is repeated until the burst is over.
The single-carrier phase fast correction method as described above, wherein the phase offset correction is further performed after the data segmentation.
The application also provides a single carrier phase rapid correction device, and the device executes any one of the single carrier phase rapid correction methods.
The beneficial effect that this application realized is as follows: by adopting the single carrier phase rapid correction method and the single carrier phase rapid correction device, synchronous tracking under spread spectrum signals can be realized, and the problems of frequency offset correction and signal demodulation are solved.
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In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments described in the present invention, and other drawings can be obtained by those skilled in the art according to the drawings.
Fig. 1 is a flowchart of a single carrier phase fast correction method according to an embodiment of the present application;
FIG. 2 is a diagram of a burst spread spectrum communication frame structure;
FIG. 3 is a schematic diagram of an initial synchronization structure of a repeating synchronization header;
FIG. 4 is a schematic flow chart of a process after burst fine acquisition is completed;
FIG. 5 is a schematic diagram illustrating phase offset correction after data segmentation;
fig. 6 shows the demodulation error rate statistics after phase adjustment by the single carrier phase fast correction method of the present application.
Detailed Description
The technical solutions in the embodiments of the present invention are clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example one
An embodiment of the present application provides a method for quickly correcting a single carrier phase, as shown in fig. 1, including:
step 110, performing matched filtering on data obtained by ADC sampling;
specifically, matched filtering is performed on data obtained by sampling of the ADC through a matched filter to filter out-of-band noise and maximize signal energy, the form of the matched filter depends on the form of a sending-end shaping filter, if the sending end is rectangular shaped, the matched filter is also a rectangular filter, and if the sending end is root-raised cosine shaped, the matched filter is also a root-raised cosine filter.
Step 120, after the filtering is completed, performing burst coarse capture on the repeated synchronization head of the burst spread spectrum communication frame structure;
fig. 2 shows a burst spread spectrum communication frame structure, where each burst is preceded by a preamble of 32 × 64 (L) ═ 2048 chips, whose content is 32 known pseudo codes repeated 64 times, followed by a known unique sync word of 512 chips, and finally data, spread by 64 times, with 1280 symbols, where the chip rate is 10Mcps and the doppler frequency offset is ± 5kHz at maximum.
After filtering by a matched filter, carrying out burst coarse acquisition, wherein the coarse acquisition is carried out by using a preamble, and the initial position of a pseudo code with the length of 32 bits can be found through the coarse acquisition, but the accurate position of the pseudo code cannot be obtained (128 sections of the same pseudo code are used as the preamble);
fig. 3 shows a repeated sync head initial sync structure. The spreading pseudo code period SP is 32, the time for searching SP is 32 pseudo code phases at most during acquisition, preferably, the search is carried out by a data segmentation method, the time for correlation each time is 16 pseudo code periods, namely 16 pseudo code periods, 16 is 32 chips, 17.5 chips are searched for each data segment, after the search of one data segment is completed, the data segment enters a waiting state, and after the next data segment is fully received, the search is restarted until the correlation peak value exceeds a threshold and the acquisition is completed;
wherein each piece of data is searched for a time of 17.5 chips, and T is used in each chipcThe correlation is carried out at a time interval of 4, so that 17.5T needs to be calculated for each section of datac÷Tc(ii)/4 ═ 70 time point correlation values; for each correlation, it can be realized by only one accumulator, the accumulator accumulates the received data according to the known pseudo code in chip intervals, after accumulation, it calculates the module value as the correlation value, it needs 32 × 16 to 512 clock cycles to complete one correlation, under the 80MHz processing clock frequency, a segment of data has 32 × 16 to 8 to 4096 clock cycles available, considering the processing overhead, one correlator can complete 7 correlation calculations in the time, therefore it needs 70/7 to 10 correlators to search in parallel;
since the frequency deviation is only +/-5 kHz at most, the phase rotation generated in the correlation time is only 2 pi 32 x 16 x 5kHz/10Mz 0.512 pi, the loss of the correlation value is about 1dB and is very small, and therefore, the frequency deviation domain can not be searched any more.
Step 130, carrying out burst fine capture by using the unique word, finding out an accurate initial position of the unique word, and carrying out initial carrier synchronization by using a preamble and the unique word to obtain an initial frequency offset and an initial phase offset;
after finding the initial position of the pseudo code through the burst coarse capture in step 120, performing burst fine capture by using the unique synchronization word of the frame structure, finding the accurate initial position of the unique word, and then performing initial carrier synchronization by using the preamble and the unique word after the accurate initial position to obtain an initial frequency offset and an initial phase offset;
specifically, burst fine acquisition is performed by using a unique word of L M ═ 512 chips, the initial position of a 32-bit long pseudo code is found through coarse acquisition, correlation is performed with the unique word by using received data every SP ═ 32 chips according to the position found through coarse acquisition, the correlation time length is 512 chips, and when the correlation peak value exceeds a threshold value, the initial position of the unique word is considered to be found;
in order to obtain a more accurate initial position, SP (SP ═ 5) sampling points before and after the current position on the capture are used as initial points, then 2P +1 correlation values are calculated, the position with the maximum 2P +1 correlation value is used as the final initial position, and the fine capture is completed;
in the embodiment of the present application, the data portion has only 64 × 1280 — 81920 chips (the spreading code length of the data is SPD — 64, and the data symbol length is SYMB — 1280), the maximum speed does not exceed mach 1, and therefore, the chip offset caused by doppler does not exceed 81920 × 340/c — 0.093 chips, which is very small, and thus, the chips may not be tracked in the data phase.
After finishing the burst fine capture, as shown in fig. 4, a carrier synchronization algorithm based on frequency offset estimation and compensation is adopted, the algorithm firstly estimates the frequency offset and then compensates the original signal, and the operation is always performed in the demodulation process;
the frequency offset estimation adopts a maximum likelihood estimation algorithm, and the data length for estimation is 64 × 16 to 1024 chips, and the estimated data length comprises 512 unique codes and 512 leading heads adjacent to the codes. In order to reduce the amount of calculation, data is despread and integrated according to a period of 64 chips, the number of sampling points is reduced to 16 points, and the sampling rate is reduced to 10 Mcps/64-156.25 kHz.
The initial frequency offset estimation adopts a maximum likelihood M L algorithm, in the searching process, the searched frequency offset range is +/-5 kHz, linear search is adopted, the searching step is 0.2kHz, the searching is carried out for 50 times, and the frequency offset estimation value is calculated
Figure RE-GDA0002524021500000051
Comprises the following steps:
Figure RE-GDA0002524021500000052
in the above formula, arg is set, L is total number of sampling points for calculation, where L is 16, rkFor data used for estimation, f is the frequency point of the search, Tb＝1/156.25kHz；
At this time, the maximum frequency offset estimation error is 0.2 kHz/2-0.1 kHz, the maximum phase offset generated in the data of the segment is 2 pi 16-0.1 kHz/1/156.25 kHz-0.02048 pi-3.68 °, and the influence on demodulation is very small and can be ignored;
after the initial frequency offset is estimated, the initial phase offset can be obtained
Figure RE-GDA0002524021500000053
Figure RE-GDA0002524021500000054
After obtaining the initial frequency offset and the phase offset estimation value, performing frequency offset correction on the segment of data by adopting the following formula:
Figure RE-GDA0002524021500000055
wherein, s'kIs a frequency deviation correction value, skIs the value of the initial frequency offset,
Figure RE-GDA0002524021500000056
is the frequency deviation estimated value, k is the number of sampling points, Tb＝1/156.25kHz，
Figure RE-GDA0002524021500000057
Is the initial phase offset.
Step 140, determining a data initial position according to the initial frequency offset and the initial phase offset, performing carrier synchronization tracking on the data, performing tracking estimation on the frequency offset and the phase offset, compensating the data, and then performing despreading demodulation output;
in the subsequent data demodulation process, the frequency offset and the phase offset also need to be tracked and estimated, unknown data is used for tracking, a segmented mode is adopted, when a section of data is received and stored, the frequency offset and the initial phase offset of the section of data are estimated, and the frequency offset of the section of data is corrected according to the estimated value; when the next section of data is full, repeating the process until the burst is finished;
in the embodiment of the application, because the burst time is short and the Doppler dynamic is small, the frequency offset can be tracked only without tracking the frequency offset;
when the initial carrier synchronization of the length of the data segment is the same, the length is still 64 × 64 ═ 4096 chips, and before phase offset tracking, despreading and integration are performed according to the spreading code and the spreading ratio to reduce the number of sampling points, so that the sampling rate is reduced to the symbol rate before spreading, for example, if the spreading ratio is 64, the number of sampling points after integration is 64;
the process of frequency deviation estimation algorithm is explained by taking the first section of data as an example, firstly, the phase deviation of the initial symbol of the first section of data is calculated according to the initially estimated frequency deviation and the initial phase deviation
Figure RE-GDA0002524021500000061
Figure RE-GDA0002524021500000062
Wherein the content of the first and second substances,
Figure RE-GDA0002524021500000063
for initial phase offset, Δ T is the length of the data segment at initial carrier synchronization, i.e., 4096 chips in time. Then, still using a maximum likelihood estimation algorithm similar to that used in the initial estimation, the initial phase offset of the first segment of data is estimated, and the initial phase offset of the data portion needs to remove the modulation information of the signal, but the modulation information of the signal is unknown, so that the obtained modulation phase needs to be multiplied by a modulation mode M (BPSK M is 2, QPSK M is 4, 8PSK M is 8):
Figure RE-GDA0002524021500000064
θk＝angle(rthek),k＝0,...L-1
rthk＝|rthek|*exp(i*θk*M),k＝0,...L-1
Figure RE-GDA0002524021500000065
l is the post-despreading integrated data symbol length used for estimation, TbIs a data symbol period after despreading and integration; the processing method of the second and third segments is the same, and is not described herein.
Fig. 5 specifically shows a schematic diagram of phase offset correction after data segmentation. Each segment of data corrects a phase, the length of the data segment is too long, so that the phase change cannot be tracked by channel change, the phase adjustment time is too short, and the noise after integration is high to influence the evaluation accuracy, so that the length of the data segment is generally set to be 1024-4096 chips. The final signal modification is as follows:
Figure RE-GDA0002524021500000066
fig. 6 shows the demodulation error rate statistics after phase adjustment by the single carrier phase fast correction method of the present application.
The above-mentioned embodiments are only specific embodiments of the present application, and are used for illustrating the technical solutions of the present application, but not limiting the same, and the scope of the present application is not limited thereto, and although the present application is described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: any person skilled in the art can modify or easily conceive the technical solutions described in the foregoing embodiments or equivalent substitutes for some technical features within the technical scope disclosed in the present application; such modifications, changes or substitutions do not depart from the spirit and scope of the present disclosure, which should be construed in light of the above teachings. Are intended to be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims (10)

1. A single carrier phase fast correction method is characterized by comprising the following steps:
performing matched filtering on data obtained by ADC sampling;
after filtering is finished, carrying out burst coarse capture on the repeated synchronous head;
performing initial carrier synchronization by using a preamble and a unique synchronization word to obtain an initial frequency offset and an initial phase offset;
and determining the initial position of the data according to the initial frequency offset and the initial phase offset, carrying out carrier synchronization tracking on the data, carrying out tracking estimation on the frequency offset and the phase offset, compensating the data, and then carrying out despreading demodulation output.
2. The method for single-carrier phase fast correction according to claim 1, wherein the data sampled by the ADC is matched filtered by a matched filter, and the form of the matched filter depends on the form of the transmit-side shaping filter.
3. The single-carrier phase fast correction method according to claim 1, wherein the burst coarse acquisition is performed on the duplicate synchronization header, specifically:
utilizing a repeated synchronization head to perform initial coarse synchronization;
and carrying out quick initial synchronization by using repeated spreading code periods.
4. The single-carrier phase fast correction method according to claim 1, wherein the initial carrier synchronization is performed by using a preamble and a unique synchronization word, and specifically comprises:
carrying out burst fine capture by using the unique synchronous word, and finding out the accurate initial position of the unique synchronous word;
and carrying out initial carrier synchronization by using the preamble and the unique synchronization word after the accurate initial position to obtain initial frequency offset and initial phase offset.
5. The single-carrier phase fast correction method according to claim 4, wherein the burst fine acquisition is performed by using a unique synchronization word, and specifically includes the following sub-steps:
according to the found position of burst coarse capture, each preset code bias is correlated with a unique synchronous word by utilizing received data, and when a correlation peak value exceeds a threshold value, the initial position of the unique synchronous word is found;
before and after finding the initial position of the unique synchronous word, a preset number of sampling points are found as initial zone numbers, 2P +1 correlation values are calculated, the position with the maximum 2P +1 correlation value is taken as the final initial position, and fine capture is completed.
6. The single-carrier phase fast correction method of claim 1, wherein a carrier synchronization algorithm based on frequency offset estimation and compensation is used to estimate frequency offset and then compensate the original signal;
calculating a frequency offset estimate by
Figure FDA0002400840590000011
Comprises the following steps:
Figure FDA0002400840590000012
where arg is the set and L is the total number of samples to be counted, where L is 16, r iskFor data used for estimation, f is the frequency point of the search, Tb＝1/156.25kHz；
The initial phase offset is then calculated:
Figure FDA0002400840590000021
7. the single-carrier phase fast correction method of claim 6, wherein after obtaining the initial frequency offset and the phase offset estimation value, the frequency offset correction is performed on the segment of data by using the following formula:
Figure FDA0002400840590000022
wherein, s'kIs a frequency deviation correction value, skIs the value of the initial frequency offset,
Figure FDA0002400840590000023
is the frequency deviation estimated value, k is the number of sampling points, Tb＝1/156.25kHz，
Figure FDA0002400840590000024
Is the initial phase offset.
8. The single-carrier phase fast correction method of claim 1, wherein the tracking estimation is performed on the frequency offset and the phase offset, specifically, unknown data is used during tracking, a segmented manner is adopted, when a full segment of data is received and stored, the frequency offset and the initial phase offset of the segment of data are estimated again, and the frequency offset of the segment of data is corrected according to the estimated value; when the next segment of data is full, the process is repeated until the burst is over.
9. The method for single-carrier phase fast correction according to claim 8, further comprising performing phase offset correction after segmenting the data.
10. A single-carrier phase fast correction apparatus, characterized in that the apparatus performs the single-carrier phase fast correction method according to any one of claims 1 to 9.
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CN113630359A (en) * 2021-06-22 2021-11-09 武汉高德红外股份有限公司 Phase tracking method, storage medium and computer
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