CN105007139A - Time-delay-inequality coding communication system communication method - Google Patents
Time-delay-inequality coding communication system communication method Download PDFInfo
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- CN105007139A CN105007139A CN201510470677.6A CN201510470677A CN105007139A CN 105007139 A CN105007139 A CN 105007139A CN 201510470677 A CN201510470677 A CN 201510470677A CN 105007139 A CN105007139 A CN 105007139A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
- H04L1/0056—Systems characterized by the type of code used
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/0014—Carrier regulation
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- 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 invention belongs to the field of underwater communication. The invention provides an improvement method for the traditional time-delay-inequality coding communication system, and solves the problem that the time estimation accuracy of a synchronous code cannot be compensated after being influenced by an underwater acoustic channel, improves the accuracy of the synchronous code serving as the reference of subsequent communication decoding time, enhances decoding performance of the whole communication system, and reduces the communication error rate. Therefore, the technical scheme adopted by the invention is the improvement method for the traditional time-delay-inequality coding communication system, comprising the following steps of: sending a communication code string which comprises frequency measurement codes, correcting codes, synchronous codes and information codes in sequence, wherein the correcting codes are the code bases of the synchronous codes and the information codes, namely any synchronous code and information code belong to the correcting codes, and meanwhile the correcting codes are sent before the synchronous codes; performing frequency measurement code detection, initial correcting code detection, initial synchronous code detection and initial information code detection in received code streams; and outputting a decoding result. The time-delay-inequality coding communication system communication method is mainly applied to underwater communication.
Description
Technical field
The invention belongs to subsurface communication field, particularly pattern time-delay coding communication system communication means.
Background technology
In traditional pattern time-delay coding communication system, communication digital information is modulated in the delay inequality of code element window, and therefore, it requires higher to the estimated accuracy of delay inequality.When delay inequality evaluated error is larger, just easily produces error code, affect communication quality, therefore, the estimated accuracy of delay inequality should be improved as far as possible.
In traditional pattern time-delay coding communication system, communications codes shooting sequence is generally frequency measurement code → synchronous code → correcting code → information code string; Wherein correcting code is the code base of information code, and namely any one information code all belongs to correcting code, and arranging of correcting code at compensation water Acoustic channel on very large program on the impact of information code, thus can improve the estimated accuracy of delay inequality.In traditional pattern time-delay coding communication system, synchronous code is the time reference that all information codes carry out accurate decoding, if the time Estimate of synchronous code is inaccurate, the time delay estimation precision of follow-up all information codes will be affected, thus the error rate of communication is raised greatly.But, in traditional pattern time-delay coding communication system, after correcting code is arranged at synchronous code, that is, correcting code does not comprise synchronous code, and be the code base of information code, therefore, after synchronous code is subject to the impact of underwater acoustic channel, correcting code does not have the effect of compensation water Acoustic channel impact, this will cause the time Estimate error of synchronous code to become large, and by this error accumulation in follow-up information code time delay estimation, thus cause communication bit error rates greatly to raise.
Summary of the invention
For overcoming the deficiency of technology, the present invention is intended to propose a kind of pattern time-delay coding communication system communication means, solve the problem that can not get after synchronous code time Estimate precision affects by underwater acoustic channel compensating, improve the precision of synchronous code as subsequent communications decoding time benchmark, promote the decoding performance of whole communication system, reduce communication bit error rates.For this reason, the technical scheme that the present invention takes is, pattern time-delay coding communication system communication means, comprise the following steps: that the sending order of communications codes is frequency measurement code → correcting code → synchronous code → information code string, correcting code is the code base of synchronous code and information code, namely any one synchronous code and information code all belong to correcting code, and meanwhile, correcting code is sent out prior to synchronous code;
The detection of frequency measurement code, the detection of initial calibration code, the detection of initial synchronisation code and the detection of initial information code is carried out in the code stream received;
Then, the frequency deviation that communications reception platform realizes causing because of relative motion between communications platform according to frequency measurement code result of detection is estimated;
Further, according to frequency offset estimation result, carry out frequency offset correction to the detection of initial calibration code, the detection of initial synchronisation code and the detection of initial information code, compensating for frequency offset, on the impact of beginning correcting code, beginning synchronous code and beginning information code, obtains correction of a final proof code, final synchronous code and final information code;
Then, with correction of a final proof code for reference code, copy related operation is carried out to obtain decode results to final synchronous code and final information code, and decode results is exported.
Frequency measurement code is for measuring the frequency shift (FS) produced because of relative motion between two communications platforms, and the compensation offset for subsequent frequencies provides foundation; Synchronous code is the time reference carrying out pattern time-delay coding; Information code string comprises many information codes of carrying the communication information, and the time interval size between information code string also contains the communication information.
Compared with the prior art, technical characterstic of the present invention and effect:
(1) synchronous code is added in correcting code, and first send correcting code, rear transmission synchronous code and information code string, can simultaneously compensation water Acoustic channel on the impact of synchronous code and information code string, improve the decoding precision of synchronous code and information code string, reduce the error rate of communication;
(2) devise the interpretation method adapted with the pattern time-delay coding communication system improved, first by frequency measurement code, frequency deviation is estimated, then, based on frequency offset estimation result, correcting code, synchronous code and information code are compensated; And using the correcting code after compensation as with reference to code, high-precision decoding is realized to synchronous code and information code, reduce the error rate of communication.
Accompanying drawing explanation
Fig. 1 illustrates the communication system principle block diagram described in the present invention.
Fig. 2 to show in the present invention the pattern time-delay coding communication system of improvement.
Fig. 3 shows the correcting code described in the present invention.
Fig. 4 shows the decoding scheme of the improvement pattern time-delay coding communication system described in the present invention.
Embodiment
For the problem enjoyed in technology, the present invention proposes improving one's methods of a kind of traditional pattern time-delay coding communication system; Synchronous code is inserted in correcting code by it, and by first sending correcting code, the mode of rear transmission synchronous code, solve the problem that can not get after synchronous code time Estimate precision affects by underwater acoustic channel compensating, improve the precision of synchronous code as subsequent communications decoding time benchmark, promote the decoding performance of whole communication system, reduce communication bit error rates.
Tool of the present invention has the following advantages: synchronous code adds in correcting code by (1), and first send correcting code, rear transmission synchronous code and information code string, can simultaneously compensation water Acoustic channel on the impact of synchronous code and information code string, improve the decoding precision of synchronous code and information code string, reduce the error rate of communication; (2) devise the interpretation method adapted with the pattern time-delay coding communication system improved, first by frequency measurement code, frequency deviation is estimated, then, based on frequency offset estimation result, correcting code, synchronous code and information code are compensated; And using the correcting code after compensation as with reference to code, high-precision decoding is realized to synchronous code and information code, reduce the error rate of communication.
The technical scheme that the present invention takes is:
The first step: communication system principle block diagram.
Communication system principle block diagram as shown in Figure 1.Communications transmit platform launches communications codes pulse train with the improvement pattern time-delay coding communication system (referring to following second step) provided in the present invention, communications codes pulse train is after underwater acoustic channel, be sent to communications reception platform, communications reception platform carries out decoding by the decoding scheme (referring to following second step) of the improvement pattern time-delay coding communication system provided in the present invention to communications codes pulse train
Second step: the improvement of traditional pattern time-delay coding communication system.
As shown in Figure 2, the sending order of communications codes is frequency measurement code → correcting code → synchronous code → information code string to the pattern time-delay coding communication system improved, and completes in the process of transmitting of communications codes communications transmit platform in FIG; The feature that the pattern time-delay coding communication system of improvement is maximum is: correcting code is the code base (as shown in Figure 3) of synchronous code and information code, and namely any one synchronous code and information code all belong to correcting code, and meanwhile, correcting code is sent out prior to synchronous code;
Further, frequency measurement code is for measuring the frequency shift (FS) produced because of relative motion between two communications platforms, and the compensation offset for subsequent frequencies provides foundation;
Further, synchronous code is the time reference carrying out pattern time-delay coding;
Further, information code string comprises many information codes of carrying the communication information, and the time interval size between information code string also contains the communication information;
Further, correcting code contains the code base of synchronous code and information code, simultaneously, correcting code and synchronous code thereafter and information code string owing to all receiving the impact of almost identical underwater acoustic channel, so, when using correcting code as with reference to signal, and when carrying out copy related operation to received signal, can the impact of compensation water Acoustic channel to a great extent, thus obtain the time delay estimation result of more accurate synchronous code and information code, reduce communication bit error rates;
3rd step: the decoding scheme improving pattern time-delay coding communication system.
Improve the decoding scheme of pattern time-delay coding communication system as shown in Figure 4, the decode procedure of whole signal of communication completes on the communications reception platform shown in Fig. 1;
First, communications reception platform carries out the detection of frequency measurement code, correcting code detection (just), synchronous code detection (just) and information code detection (just) from the code stream received;
Then, the frequency deviation that communications reception platform realizes causing because of relative motion between communications platform according to frequency measurement code result of detection is estimated;
Further, according to frequency offset estimation result, frequency offset correction is carried out to correcting code detection (just), synchronous code detection (just) and information code detection (just), compensating for frequency offset, on the impact of correcting code, synchronous code and information code, obtains correcting code (end), synchronous code (end) and information code (end);
Then, with correcting code (end) for reference code, copy related operation is carried out to obtain decode results to synchronous code (end) and information code (end), and decode results is exported.
The present invention is further described below in conjunction with specific embodiment.
The invention provides improving one's methods and device of a kind of traditional pattern time-delay coding communication system.
Tool of the present invention has the following advantages: synchronous code adds in correcting code by (1), and first send correcting code, rear transmission synchronous code and information code string, can simultaneously compensation water Acoustic channel on the impact of synchronous code and information code string, improve the decoding precision of synchronous code and information code string, reduce the error rate of communication; (2) devise the interpretation method adapted with the pattern time-delay coding communication system improved, first by frequency measurement code, frequency deviation is estimated, then, based on frequency offset estimation result, correcting code, synchronous code and information code are compensated; And using the correcting code after compensation as with reference to code, high-precision decoding is realized to synchronous code and information code, reduce the error rate of communication.
The technical scheme that the present invention takes is:
The first step: communication system principle block diagram.
Communication system principle block diagram as shown in Figure 1.Communications transmit platform launches communications codes pulse train with the improvement pattern time-delay coding communication system (referring to following second step) provided in the present invention, communications codes pulse train is after underwater acoustic channel, be sent to communications reception platform, communications reception platform carries out decoding by the decoding scheme (referring to following second step) of the improvement pattern time-delay coding communication system provided in the present invention to communications codes pulse train
Second step: the improvement of traditional pattern time-delay coding communication system.
As shown in Figure 2, the sending order of communications codes is frequency measurement code → correcting code → synchronous code → information code string to the pattern time-delay coding communication system improved, and completes in the process of transmitting of communications codes communications transmit platform in FIG; The feature that the pattern time-delay coding communication system of improvement is maximum is: correcting code is the code base (as shown in Figure 3) of synchronous code and information code, and namely any one synchronous code and information code all belong to correcting code, and meanwhile, correcting code is sent out prior to synchronous code;
Further, frequency measurement code is for measuring the frequency shift (FS) produced because of relative motion between two communications platforms, and the compensation offset for subsequent frequencies provides foundation;
Further, synchronous code is the time reference carrying out pattern time-delay coding;
Further, information code string comprises many information codes of carrying the communication information, and the time interval size between information code string also contains the communication information;
Further, correcting code contains the code base of synchronous code and information code, simultaneously, correcting code and synchronous code thereafter and information code string owing to all receiving the impact of almost identical underwater acoustic channel, so, when using correcting code as with reference to signal, and when carrying out copy related operation to received signal, can the impact of compensation water Acoustic channel to a great extent, thus obtain the time delay estimation result of more accurate synchronous code and information code, reduce communication bit error rates;
3rd step: the decoding scheme improving pattern time-delay coding communication system.
Improve the decoding scheme of pattern time-delay coding communication system as shown in Figure 4, the decode procedure of whole signal of communication completes on the communications reception platform shown in Fig. 1;
First, communications reception platform carries out the detection of frequency measurement code, correcting code detection (just), synchronous code detection (just) and information code detection (just) from the code stream received;
Then, the frequency deviation that communications reception platform realizes causing because of relative motion between communications platform according to frequency measurement code result of detection is estimated;
Further, according to frequency offset estimation result, frequency offset correction is carried out to correcting code detection (just), synchronous code detection (just) and information code detection (just), compensating for frequency offset, on the impact of correcting code, synchronous code and information code, obtains correcting code (end), synchronous code (end) and information code (end);
Then, with correcting code (end) for reference code, copy related operation is carried out to obtain decode results to synchronous code (end) and information code (end), and decode results is exported.
Claims (2)
1. a pattern time-delay coding communication system communication means, it is characterized in that, comprise the following steps: that the sending order of communications codes is frequency measurement code → correcting code → synchronous code → information code string, correcting code is the code base of synchronous code and information code, namely any one synchronous code and information code all belong to correcting code, meanwhile, correcting code is sent out prior to synchronous code;
The detection of frequency measurement code, the detection of initial calibration code, the detection of initial synchronisation code and the detection of initial information code is carried out in the code stream received;
Then, the frequency deviation that communications reception platform realizes causing because of relative motion between communications platform according to frequency measurement code result of detection is estimated;
Further, according to frequency offset estimation result, carry out frequency offset correction to the detection of initial calibration code, the detection of initial synchronisation code and the detection of initial information code, compensating for frequency offset, on the impact of beginning correcting code, beginning synchronous code and beginning information code, obtains correction of a final proof code, final synchronous code and final information code;
Then, with correction of a final proof code for reference code, copy related operation is carried out to obtain decode results to final synchronous code and final information code, and decode results is exported.
2. pattern time-delay coding communication system communication means as claimed in claim 1, is characterized in that, frequency measurement code is for measuring the frequency shift (FS) produced because of relative motion between two communications platforms, and the compensation offset for subsequent frequencies provides foundation; Synchronous code is the time reference carrying out pattern time-delay coding; Information code string comprises many information codes of carrying the communication information, and the time interval size between information code string also contains the communication information.
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Cited By (1)
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| CN105790855A (en) * | 2016-04-29 | 2016-07-20 | 天津大学 | Acoustic signal emission method based on delay inequality coding principle and apparatus thereof |
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| CN103197318A (en) * | 2013-03-18 | 2013-07-10 | 中国科学院声学研究所 | Time delay estimation method based on the Pattern delay coding underwater acoustic positioning |
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| CN105790855A (en) * | 2016-04-29 | 2016-07-20 | 天津大学 | Acoustic signal emission method based on delay inequality coding principle and apparatus thereof |
| CN105790855B (en) * | 2016-04-29 | 2018-10-19 | 天津大学 | Acoustical signal launching technique and device based on pattern time-delay coding principle |
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Application publication date: 20151028 |