CN102281076B - RS (Reed-Solomon) cascade code design method based on increase of frequency hopping radio station anti-interference capabilities - Google Patents
RS (Reed-Solomon) cascade code design method based on increase of frequency hopping radio station anti-interference capabilities Download PDFInfo
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- CN102281076B CN102281076B CN201110075922.5A CN201110075922A CN102281076B CN 102281076 B CN102281076 B CN 102281076B CN 201110075922 A CN201110075922 A CN 201110075922A CN 102281076 B CN102281076 B CN 102281076B
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Abstract
The invention provides an RS (Reed-Solomon) cascade code design method based on increase of frequency hopping radio station anti-interference capabilities. The method comprises an RS cascade code forming way, a sending path coding processing method and a receiving path decoding processing method. The RS cascade code comprises the following three parts: an outer code which is an RS code; an inner code which is formed through combination of an error-detecting code, an error hopping statistical detection method and a modulation-demodulation error hopping detection method; an interlacement. A frequency hopping radio station integration business unit is taken as a hardware platform, a channel characteristic and a data transmission characteristic of the frequency hopping radio station are taken into comprehensive consideration, based on a hopping effective transmission byte length and a data transmission frame structure, an inner code parameter and an RS code parameter are determined, erasure performance of the RS code is fully fulfilled, and coding and decoding processing methods are accomplished. According to the invention, a physical structure, a geometric dimension and weight of a frequency hopping radio station are not changed; it is ensured that the frequency hopping radio station has capabilities of random interference resistance, emergent interference resistance and mixing interference resistance, and even has a capability of 70% emergent interference resistance; the method of the invention has the characteristics of a reasonable design, a stable operation, reliable working, strong practicality and the like.
Description
Technical field
The invention provides a kind of RS cascaded code method for designing based on improving the anti-channel disturbance ability of frequency hopping radio set, particularly in order to improve frequency hopping radio set in anti-random disturbances, bursty interference and to mix the error correcting capability under disturbed condition.
Background technology
Nowadays, in the flourish epoch of present information, the application of Radio Transmission Technology is more and more extensive.And the wireless Internet data communication that appears as of frequency hopping radio set set up strong basis, be used to various communications platforms that jamproof data communication and digital voice are provided, transmit in real time or closely in real time various information.This just requires transmission, processing, the distribution of the communication information will accomplish reliably, in time, effectively, so the effect therein of channel coding/decoding technology just seems particularly important.
We know that the error rate in Wireless Data Transmission is to weigh the direct indicator of data transmission quality.In actual applications, we often characterize the error rate of the channel before actual error correction decoding with channel bit error rate, with residual BER, characterize channel error rate after error correction decoding, also can adopt these two data to weigh the error correcting capability of the error correction coding/decoding method of use.Along with the development of channel coding technology, there is the decoding method that various error correcting capabilities are pretty good.These code decode algorithms have all obtained practical application according to performance characteristics separately, and especially cascaded code obtains application the most widely in radio communication.
The employing wireless channel of frequency hopping radio set own, transmission condition is not fine, exists rapid fading and the slow fading of various natural disturbance and transmission itself, causes transmission generation mistake, random disturbances that Here it is.In addition, frequency hopping radio set itself is for jamproof, inevitably will be subject to artificial disturbance, improper when the selection of frequency hopping Frequency point, can make the interruption of communication quality, channel condition further worsens, channel bit error rate sharply increases, and the mistake that this interference causes is called bursty interference.It is exactly the channel disturbance condition of frequency hopping radio set that random disturbances and bursty interference and their mixing are disturbed.
At present, under the certain message transmission rate of requirement of part frequency hopping radio set antagonism bursty interference, guarantee the correct transmission of 70% wrong frequency.For guaranteeing the transmission reliability of frequency hopping radio set, just must adopt a kind of error correction coding/decoding algorithm can meet the ability of correcting random error and burst error simultaneously.Conventionally general error correction coding/decoding method only has the ability of correcting random error, and RS code (Reed-Solomon codes) is in finite field
the cyclic code of upper structure, has the ability of correcting burst error and random error in theory, but to bursty interference and mixing, disturbs wrong error correcting capability to need further raising in actual applications, could meet the requirement of frequency hopping radio set.
The method that adopts now RS cascaded code normally outer code is selected RS code, and ISN is selected convolution code, finally adds interleaver.ISN is corrected random error, and interleaver and RS code are corrected burst error.Here needing the problem solving is exactly to realize the error correcting capability of RS code maximum, just must obtain the position of decoding error code word.In theory when RS code is when knowing errors present, the error correcting capability when not knowing errors present will double.And ISN only adopts error correcting code just can not complete definite function of errors present.Yet, in existing frequency hopping radio set, only with a kind of ISN, complete determining of errors present, so just easily produce false retrieval and undetected, thereby reduced the RS error-correcting performance of allocation really, therefore insider special expect to have a kind ofly can, in conjunction with the Cascading Methods of the RS code of frequency hopping radio set transmission feature, complete the error correction of the maximum performance under the actual channel of radio station.
Summary of the invention
Object of the present invention is exactly not enough in order to overcome above-mentioned existing methods, provides a kind of reasonable in design, the RS cascaded code method for designing based on improving frequency hopping radio set antijamming capability of reliable operation.
In order to achieve the above object, the technical solution used in the present invention is:
A RS code cascaded code method for designing that improves frequency hopping radio set antijamming capability, comprises RS cascaded code constituted mode, transmission path code processing method and receiving path decoding processing method.
Described RS cascaded code constituted mode is comprised of outer code, ISN and 3 parts that interweave, wherein: outer code is RS code;
ISN is that error detection code, wrong jumping statistics detection method and the triplicity of the wrong jumping of modulation /demodulation detection method form;
Interweave for interleaver output interleaving data structure.
And the error detection code in ISN adopts parity code or the constant ratio code of high code check, complete the error detection of a RS symbol;
It is by the wrong symbol numbers occurring in each jumping is added up that mistake in ISN is jumped statistics detection method, carries out mistake jumping detection judge according to predetermined threshold values;
The wrong detection method of jumping of modulation /demodulation in ISN is to judge by adding the wrong jumping of redundant information realization to detect.
In sum, provide following 3 forms and shown its corresponding contents:
Table 1 is RS cascaded code constituted mode of the present invention
Table 2 is RS cascaded code data structures of the present invention
Table 3 is interleaving data structures in RS cascaded code of the present invention
Described transmission path code processing method, is completed by 5 steps altogether, wherein:
Described receiving path decoding processing method, is completed by individual 7 steps altogether, wherein:
The present invention is based on software realization replacement hardware and be embodied as global design thought, in whole design process, strict reservation under the constant prerequisite of frequency hopping radio set physical structure, make full use of frequency hopping radio set integrated service unit as hardware platform, MAC layer by frequency hopping radio set transmission path obtains data to be encoded, then encodes and the modulating layer of delivering to transmission path is processed; And obtain data to be decoded by the demodulation layer of the receiving path of frequency hopping radio set, then decode and the MAC layer of delivering to receiving path is processed.Also consider channel characteristics and the Data Transmission Feature of frequency hopping radio set simultaneously, by jumping effectively transmission byte length, data transmission frame structure and related hardware platform resource, determined ISN, RS code parameters.
Present invention focuses on to give full play to entangling of RS code and delete performance, after right-on acquisition mismark detects, make RS code there is the ability of correcting a check length mismark.
The present invention wrong is jumped detection method, ISN error detection, is wrongly jumped the errors present that 3 modes of statistics detection method obtain RS code sign by modulation /demodulation, and can play complementary effect during their comprehensive functions.First be the wrong detection method of jumping of modulation /demodulation, it is to every jumping figure according to adding certain redundant information, and whether by the accuracy of comparison redundant information, carry out this jumping is the judgement of disturbed jumping.During operation, the threshold values of judgement can be got lower, thereby guarantee not false retrieval.Next is ISN error detection, the part mistake that when it can detect random disturbances, RS code sign occurs, thus guarantee few undetected.Be finally the wrong statistics detection method of jumping, in Ta Yiyitiao radio station transmission data, mismark number is carried out mistake jumping judgement.When the mismark number detecting when ISN is greater than certain threshold values, carry out, judge that this jumping jumps for wrong, again avoid undetected.This threshold values effectively transmits data length calculative determination by the every jumping in radio station.
In sum, remarkable advantage of the present invention is: the physical structure, physical dimension and the weight that do not change frequency hopping radio set completely; Fully guarantee that frequency hopping radio set has anti-random disturbances, 70% bursty interference or mixes the ability of disturbing; Also there is reasonable in design, stable, reliable operation, the feature such as practical simultaneously.
Accompanying drawing explanation
The hardware platform of Fig. 1 the present invention operation is the integrated service unit electricity theory diagram based on frequency hopping radio set
Fig. 2 code processing method of the present invention belongs to the transmission path view of frequency hopping radio set
Fig. 3 decoding processing method of the present invention belongs to the receiving path view of frequency hopping radio set
Fig. 4 transmission path code processing method of the present invention flow chart
Fig. 5 receiving path decoding processing method of the present invention flow chart
Symbol description in figure:
1 is ARM embedded microprocessor (S3C2410)
2 is FPGA field programmable gate array (XC3S1200E)
3 is intermediate frequency DSP digital signal processor (C5510)
4 is audio frequency DSP digital signal processor (C5416)
1.1 is Ethernet interface
1.2 are and panel communication serial port
1.3 is universal asynchronous serial
1.4 is PRAM
1.5 is real-time clock (RTC)
1.6 is FLASH
4.1 is audio signal processor (TLV320AC14)
Embodiment
Referring to Fig. 1 to Fig. 5 and table 1 to shown in table 3, is the specific embodiment of the invention.
As can be seen from Figure 1: the hardware platform of work of the present invention is the integrated service unit by means of frequency hopping radio set, it includes an ARM embedded microprocessor 1, a FPGA (field programmable gate array) 2, an intermediate frequency DSP digital signal processor 3, an audio frequency DSP digital signal processor 4, and each the corresponding interface.The code processing method of transmission path and the decoding processing method of receiving path all complete on same intermediate frequency DSP digital signal processor.
As can be seen from Figure 2: the code processing method of transmission path is to carry out on the transmission path of frequency hopping radio set, data to be encoded can be speech or data.The speech of peripheral hardware input is by audio treatment unit collection, processing, by main control unit forwards, MAC layer is encoded processing after controlling, according to sequence control, send to modulating layer, pass through radio frequency unit and deliver to channel.The data of PC input by main control unit forwards, MAC layer is encoded processing after controlling, according to sequence control, send to modulating layer, pass through radio frequency unit and deliver to channel.
As can be seen from Figure 3: the decoding processing method of receiving path is to carry out in the receiving path of frequency hopping radio set, and decoded data can be speech or data, by sequence control, are distinguished.After the signal of the demodulation layer acquisition radio frequency unit in reception radio station, carry out demodulation, the redundant information of demodulating data and demodulation is submitted to codec processing unit, codec processing unit is decoded according to the inventive method, by the data that decoding is correct, according to receiving slot differentiation speech or data, give respectively MAC layer, finally by main control unit, be transferred to peripheral hardware.
As can be seen from Table 1: RS cascaded code constituted mode of the present invention, it is by outer code, ISN and interweave and form.Wherein:
Outer code is RS code;
ISN is that error detection code, wrong jumping statistics detection method and the triplicity of the wrong jumping of modulation /demodulation detection method form;
Interweave for interleaver output interleaving data structure.
And the error detection code in ISN adopts parity code or the constant ratio code of high code check, complete the error detection of a RS symbol;
Mistake in ISN is jumped statistics detection method and is added up by the symbol numbers that each jumping ISN is made a mistake, and carries out mistake jumping detection judge according to predetermined threshold values;
The wrong detection method of jumping of modulation /demodulation in ISN is judged by adding redundant information to complete wrong jumping detection.
As can be seen from Table 2: the data structure of RS cascaded code of the present invention.RS code is according to the mode processing of encoding of row, and the length of the final row of formation is a complete RS code code word size, and ISN error detection code is processed separately the symbol of each RS code, forms independently ISN code word.Every data line is exactly a complete jumping secured transmission of payload data, comprises k ISN code word and the modulation redundant information adding.
As can be seen from Table 3: interleaving data structure in RS cascaded code of the present invention.A line that during transmission, table 2 is got in every jumping sends, and after part frequency hopping point is wherein disturbed, also only has influence on according to a part of symbol of the RS code of row coding, as long as wrong frequency hopping point in error-correcting performance, just can obtain correct decoding, exports.
As can be seen from Figure 4: the code processing method of transmission path is completed by 5 steps altogether, wherein:
Step 401 is data preliminary treatment, completes the length judgement of data to be encoded, and data stuffing and data byte, to the conversion of RS symbol, for meeting the work of interleaver, also need data to store according to two-dimensional matrix mode simultaneously.
Step 402 is RS codings, in two-dimensional matrix, according to the mode of row, carry out RS coding, get a column information symbol, according to the RS encryption algorithm of standard at every turn, by obtaining check information, according to the mode of row, be stored in the rear two-dimensional matrix of coding space, all k row are all carried out to RS coding one time.
Step 403 is ISN cataloged procedures, and data after RS coding are carried out to ISN coding (checksum coding or constant ratio code coding) according to the structure of independent symbol, and the code word of obtaining is still stored in the rear space of matrices of coding in the mode of symbol.
Step 404 has been to add modulation redundant information, adds redundant information, the length of information need to consider the defeated effective word joint number of jump set and the wrong validity of jumping of error detection the two-dimensional matrix after coding according to row.
Step 405 has been the work that interweaves, and according to every jump set, send the structure that data are got table 2 data structure space a line that the data after coding are sent to modulating layer, completes the work of interleaver.
As can be seen from Figure 5: the decoding processing method of receiving path is completed by 7 steps altogether, wherein:
Step 501 is data preliminary treatment to be decoded, mainly completes the symbol transition of data, and the structure of receiving the code word that data are ISN according to each symbol is changed.
Step 502 is that wrong jumping of the demodulation of data detected, and the redundant data after demodulation is carried out to error statistics and according to threshold values, carry out mistake jumping judgement, mistake is jumped to indication and preserve.The mistake is here jumped judgement and can be failed to judge, and avoids misjudgement as far as possible.
Step 503 has been deinterleavings, and the demodulating data of input is saved in to two-dimensional matrix to be decoded space according to the mode of receiving a jumping storing one row.With this work that interweaves that completes data by row encoding and decoding, the mode that send to receive with row.This mode has just guaranteed in a decoding two-dimensional matrix space, while there is the mistake jumping of several frequencies simultaneously, each is had to identical impact by the RS code of row decoding, only impact mistake is jumped a symbol of correspondence position, as long as within the decoding capability of every row RS code, just can there is not some RS codes failed situation of decoding.
Step 504 has been inner decoding processes.The check information of ISN is removed, and stored the sign that in each, whether code sign makes a mistake.
Step 505 has been that the wrong statistics of jumping detects.According to the error flag of ISN, according to row, add up, when the ISN symbol error number of every row is greater than certain threshold values, can be similar to the data that are defined as this row is wrong jumping figure certificate, giving makes mistake jumps sign, then and jump sign with the mistake of demodulation together with as final mistake, jump sign.The main cause of doing is like this: current parity code can only detected symbol in the mistake of 1 bit, constant ratio code also can only the inner minute mistake of detected symbol, if only use the error flag of ISN, serious undetected by causing.When a jumping figure certificate mismark number detected when more, this jumping figure is a maximum according to completely wrong probability.
Step 506 and 807 has been RS decoding work, wherein:
Step 506 is that the mode that is listed as reads the error flag of symbol and the mistake of this symbol row of living in is jumped sign, two values is carried out or process the symbol indicated value that just obtains finally can being updated to RS decoder.
Step 507 is that the data of decoding two-dimensional matrix are decoded according to row, and the mistake of at every turn getting a row symbol and this symbol is carried out RS together with indicating and entangled and delete decoding, and with entangling the RS code of deleting, decoding capability can reach allows that the symbol of check digit number makes a mistake.
Above embodiment, is preferred embodiment of the present invention, in order to technical characterictic of the present invention and exploitativeness to be described, not in order to limit the right of applying for a patent of the present invention; Above description, should understand and be implemented for knowing those skilled in the art simultaneously, and therefore, other are not departing from equivalent change or the modification completing under disclosed prerequisite, within all should being included in described claim.
The present invention is a rare RS cascaded code method for designing that has raising frequency hopping radio set antijamming capability.It takes full advantage of RS code, error detection code and statistics feature, and creative, novelty, practicality and progressive, meet application for a patent for invention important document, completely therefore file an application according to Patent Law.
Claims (6)
1. the RS cascaded code method for designing based on improving frequency hopping radio set antijamming capability, comprises RS cascaded code constituted mode, transmission path code processing method and receiving path decoding processing method, it is characterized in that:
Described RS cascaded code constituted mode is comprised of outer code, ISN and 3 parts that interweave, wherein:
Outer code is RS code;
ISN is that error detection code, wrong jumping statistics detection method and the triplicity of the wrong jumping of modulation /demodulation detection method form;
Interweave for interleaver output interleaving data structure.
2. the RS cascaded code method for designing based on improving frequency hopping radio set antijamming capability as claimed in claim 1, is characterized in that:
Described transmission path code processing method, is completed by 5 steps altogether, wherein:
Step 401 is data preliminary treatment, completes the length judgement of data to be encoded, and data stuffing and data byte, to the conversion of RS symbol, for meeting the work of interleaver, also need data to store according to two-dimensional matrix mode simultaneously;
Step 402 is RS codings, in two-dimensional matrix, according to the mode of row, carry out RS coding, get a column information symbol, according to the RS encryption algorithm of standard at every turn, by obtaining check information, according to the mode of row, be stored in the rear two-dimensional matrix of coding space, all k row are all carried out to RS coding one time;
Step 403 is ISN cataloged procedures, and data after RS coding are carried out to ISN coding according to the structure of independent symbol, and the code word of obtaining is still stored in the rear space of matrices of coding in the mode of symbol;
Step 404 has been to add modulation redundant information, and the two-dimensional matrix after coding is added to redundant information according to row;
Step 405 has been the work that interweaves, and according to every jump set, send the structure that data are got space of matrices a line that the data after coding are sent to modulating layer, completes the work of interleaver.
3. the RS cascaded code method for designing based on improving frequency hopping radio set antijamming capability as claimed in claim 1, is characterized in that:
Described receiving path decoding processing method, is completed by individual 7 steps altogether, wherein:
Step 501 is data preliminary treatment to be decoded, completes the symbol transition of data, and the structure of receiving the code word that data are ISN according to each symbol is changed;
Step 502 is that wrong jumping of the demodulation of data detected, and the redundant data after demodulation is carried out to error statistics and according to threshold values, carry out mistake jumping judgement, mistake is jumped to indication and preserve;
Step 503 has been deinterleavings, and the demodulating data of input is saved in to two-dimensional matrix to be decoded space according to the mode of receiving a jumping storing one row;
Step 504 has been inner decoding processes; The check information of ISN is removed, and stored the sign that in each, whether code sign makes a mistake;
Step 505 has been that the wrong statistics of jumping detects; According to the error flag of ISN, according to row, add up, when the ISN symbol error number of every row is greater than certain threshold values, can be similar to the data that are defined as this row is wrong jumping figure certificate, giving makes mistake jumps sign, then and jump sign with the mistake of demodulation together with as final mistake, jump sign;
Step 506 is that the mode being listed as reads the error flag of symbol and the mistake of this symbol row of living in jumping sign, and two values are carried out to exclusive disjunction, obtains the symbol error value of statistical indicant of RS code;
Step 507 is that the data of decoding two-dimensional matrix are decoded according to row, and the mistake of at every turn getting a row symbol and this symbol is carried out RS together with indicating and entangled and delete decoding.
4. the RS cascaded code method for designing based on improving frequency hopping radio set antijamming capability as claimed in claim 1, is characterized in that:
Described error detection code is parity code or the constant ratio code of high code check, completes the error detection of a RS symbol.
5. the RS cascaded code method for designing based on improving frequency hopping radio set antijamming capability as claimed in claim 1, is characterized in that:
Described wrong jumping is added up detection method for adding up one by one by the symbol numbers making a mistake in each is jumped, and carries out mistake jump detection judgement according to predetermined threshold values.
6. the RS cascaded code method for designing based on improving frequency hopping radio set antijamming capability as claimed in claim 1, is characterized in that:
The wrong detection method of jumping of described modulation /demodulation is for judging by adding redundant information realization mistake to jump to detect.
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| CN109802760A (en) * | 2018-12-29 | 2019-05-24 | 北京行易道科技有限公司 | The storage method and device of data, the coding/decoding method of data |
| CN110138415B (en) * | 2019-06-21 | 2020-11-03 | 西安电子科技大学 | Frequency point interference judging method for frequency hopping communication |
| CN113890687A (en) * | 2021-11-15 | 2022-01-04 | 杭州叙简未兰电子有限公司 | High-reliability audio transmission method and device based on mixing of error correction codes and erasure codes |
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| US6134694A (en) * | 1996-02-29 | 2000-10-17 | Ntt Mobile Communications Network, Inc. | Error control method and error control device for digital communication |
| CN1277494A (en) * | 1999-06-11 | 2000-12-20 | 阿尔卡塔尔公司 | Method of coding for information element using product code in application of satellite |
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| US6134694A (en) * | 1996-02-29 | 2000-10-17 | Ntt Mobile Communications Network, Inc. | Error control method and error control device for digital communication |
| CN1277494A (en) * | 1999-06-11 | 2000-12-20 | 阿尔卡塔尔公司 | Method of coding for information element using product code in application of satellite |
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