CN103532663B - A kind of frequency hopping fountain code system and transmission method thereof - Google Patents
A kind of frequency hopping fountain code system and transmission method thereof Download PDFInfo
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Abstract
The present invention relates to a kind of frequency hopping fountain code system and transmission method thereof, particularly relate to the transmission method of the frequency hopping fountain code system that a kind of novel interleaving technology introduces, belong to the correlative technology fields such as wireless communication system, signal of communication process and channel decoding。In the present invention, frequency hopping fountain code system can be interfered at a part of frequency and transmission data when total blockage, enhances communication system reliability under poor channel environments。The present invention, by adopting Bit Interleaved Coded Modulation technology, improves the bit error rate performance of system。Simultaneously because do not increase redundancy, the speed of information transmission is unaffected。The present invention have employed bit-level interleaver, when enemy cannot obtain interlacing rule, it is possible to play the effect of encryption, improve the degree of safety of information transmission。
Description
Technical field
The present invention relates to a kind of frequency hopping fountain code system and transmission method thereof, particularly relate to the transmission method of the frequency hopping fountain code system that a kind of novel interleaving technology introduces, belong to the correlative technology fields such as wireless communication system, signal of communication process and channel decoding。
Background technology
Among current day by day fierce Electronic Warfare Environment, how under the channel circumstance that the complexity being subject to enemy's interference is severe, safely and effectively to transmit data, be one of the focus of current military communication research。Frequency-hopping Communication Technology makes radio transmission frequency carry out saltus step by random order and speed, when enemy cannot grasp saltus step rule, it is possible to effectively avoid the information transmitted to be trapped。For block type broadband interference, part frequency is disturbed and cannot transmit information, and now frequency-hopping system generally adopts the reliability that long Forward Error Correction code (FEC) technology interweaved with High redundancy communicates with guarantee。And along with the development of communication technology Yu information transfer demands, in the transmission of image, video and data file, require that communication system has higher transfer rate and the less bit error rate, meanwhile, the channel width being interfered in transmission also can be continuously increased。Now, adopt conventional long intertexture and highly redundant FEC technology to be relatively difficult to ensure card communication quality, more cannot effectively utilize the channel capacity under interference environment。Therefore in the urgent need to studying new technological means to ensure the communication quality of frequency-hopping communication system under strong interference environment。
Fountain coding technology can obtain good performance under erasure channel, and the frequency-hopping communication system under strong jamming has typical erasure channel feature, so occurring in that the Frequency-hopping Communication Technology adopting fountain codes in recent years。In frequency-hopping communication link, it is interfered if there is some different frequency sub-band in whole communications band and information cannot be transmitted, then these frequency ranges are when being utilized by communication system, and its channel can be analyzed as erasure channel。By fountain codes encoder, transmitting terminal can generate a unlimited coded identification and constantly send, and decoder need be only limited by arbitrarily abundant coded identification just energy restoring data。Therefore, no matter the probability of erasure of erasure channel is much, constantly produces signal such as through encoder and enables decoder to be subject to abundant coded identification, and then restores transmission data。
But, frequency hopping fountain codes technology still has incomplete place。Except part frequency owing to blocking except being interfered can regard erasure channel as, the channel on other frequencies still can be subject to the impact of noise and decline。Having certain error correcting capability although with low code rate LDPC code as the Raptor fountain codes of precoding, the system transfers bit error rate cannot practical requirement in any case。Can reduce the bit error rate of system according to error correcting codes such as convolutional codes, but the complexity of System build code will be strengthened, simultaneously because it can bring new redundancy, the transfer rate of information will certainly be reduced。
For this, herein in connection with Bit Interleaved Coded Modulation (Bit-interleavedCodedModulation, BICM) technology, improve frequency hopping fountain code system, and explore Novel Delivery method。BICM technology is applied to improve communication system performance in fading channel the earliest, also has good performance in awgn channel simultaneously。BICM technology, by introducing bit interleaver between channel encoder output and manipulator, improves the coded diversity degree of system。And redundancy is not increased due to it, it is possible in the performance improving system when not reducing the rate of information throughput。
Summary of the invention
It is an object of the invention to improve further the anti-strong jamming performance of frequency-hopping communication system, by Bit Interleaved Coded Modulation Technology application in based in the frequency-hopping communication system of fountain coding, propose a kind of novel frequency hopping fountain code system and transmission method thereof, do not reduce the situation decline low transmission bit error rate of system information transmissions speed, only bring less system complexity to increase simultaneously。
The present invention is achieved by the following technical solutions。
A kind of frequency hopping fountain code system of the present invention and transmission method thereof include " a kind of frequency hopping fountain code system " and " a kind of frequency hopping fountain codes transmission method " two aspects。
A kind of frequency hopping fountain code system of the present invention, including transmitter, channel and receiver three part；
Wherein, transmitter includes signal source, fountain channel coding module, interleaving block, modulation module and frequency hopper module；
Channel is continuous/random erasure channel；
Receiver includes dehop module, information demodulation module, de-interleaving block, fountain channel decoding module and decision statistic module；
Its annexation is: transmitter is connected with channel, and channel is connected with receiver；In transmitter, fountain channel coding module is passed in the output of signal source, and interleaving block is passed in the output of fountain channel coding module, and modulation module is passed in the output of interleaving block, and frequency hopper module is passed in the output of modulation module；In receiver, demodulation module is passed in the output of dehop module, and de-interleaving block is passed in the output of demodulation module, and decoding fountain codes module is passed in the output of de-interleaving block。
A kind of transmission method of the frequency hopping fountain codes of the present invention, its step is as follows:
In step one, transmitter, information bit to be sent is formed the frames of information bits that several length are N-bit by signal source。
The frames of information bits generated in step one is carried out fountain coding by step 2, fountain codes encoder, and the fountain coding frame length of generation is K bit。Current information bit frame is constantly carried out fountain coding and produces fountain coding frame by encoder, until receiving what receiving terminal was sent feedback information, starts the fountain coding to next frames of information bits；
Wherein, the fountain coding described in step 2 adopts LT code or Raptor code；
The fountain coding frame produced after being encoded in step 2 is delivered in bit interleaver by step 3, fountain codes encoder, carries out bit-level intertexture in units of a frame of fountain codes coding。Coded frame through Bit Interleave being generated according to the planisphere of MQAM modulation type subsequently and send symbolic frame, wherein M represents the exponent number of QAM modulation。The symbolic frame length generated after MQAM modulates is K/M symbol。
Step 4, symbolic frame will be generated in step 3 by frequency hopping modulation device, and according to Hopping frequencies table data symbol be delivered to and different Frequency points sends out, arrive receiving terminal through wireless channel；
Step 5, receiving terminal realize reaching consistent with transmitting terminal clock by correcting local clock, it is achieved synchronizing process, make the jump frequency sequence of receiving terminal and bound-time all identical with transmitting terminal, obtain the frequency hopping pattern consistent with transmitting terminal；
Step 6, receiving terminal, by arriving the signal generation receiving symbol frame of receiving terminal in step 4 through wireless channel, are multiplied with the frequency hopping pattern generated in step 4, complete the Frequency Hopping Signal solution received is jumped, obtain the symbolic frame that length is K/M；
The symbolic frame generated in step 6 is demodulated by step 7, receiving terminal, obtains receiving bit information frame, and the length of frame is K bit。Receiving bit information frame and enter the deinterleaver corresponding with transmitting terminal, bit information is deinterleaved, deinterleaving length is K bit。
Step 8, gained in step 7 is made friends with after bit information frame carry out fountain codes decoding, and to detect be wherein whether also have uncertain bit: if still having uncertain bit, then continues the fountain decoding of this frame；If there is no uncertain bit after detection, then send feedback information to information source, it is desirable to information source sends next frames of information bits。
Namely the transmission work of one frame of fountain codes frequency-hopping communication system is completed through above-mentioned eight steps。
Beneficial effect
1, in the present invention, frequency hopping fountain code system can be interfered at a part of frequency and transmission data when total blockage, enhances communication system reliability under poor channel environments。
2, the present invention is by adopting Bit Interleaved Coded Modulation technology, improves the bit error rate performance of system。Simultaneously because do not increase redundancy, the speed of information transmission is unaffected。
3, the present invention have employed bit-level interleaver, when enemy cannot obtain interlacing rule, it is possible to play the effect of encryption, improve the degree of safety of information transmission。
Accompanying drawing explanation
Fig. 1 be the present invention a kind of frequency hopping fountain code system in the composition schematic diagram of transmitter part；
Fig. 2 be the present invention a kind of frequency hopping fountain code system in the composition schematic diagram of receiver section；
Fig. 3 is the signal to noise ratio simulation result figure transmitted in strong jamming channel in the embodiment of the present invention, and wherein abscissa is signal to noise ratio, and disturbed frequency accounts for the 30% of total frequency number；
Fig. 4 is in the embodiment of the present invention, it is possible to when being correctly decoded, required fountain codes code character sends the comparison of number。
Detailed description of the invention
Below in conjunction with drawings and Examples, the present invention will be further described and detailed description。
Embodiment
Fig. 1 and Fig. 2 is the structural representation of a kind of frequency hopping fountain code system, and from Fig. 1 and Fig. 2, first the bit information sent from information source carries out fountain codes coding。In the present embodiment, fountain codes type is Raptor code, and adopts LDPC code to carry out precoding。Subsequently, being interleaved through bit interleaver by the signal after coding, the bit information after intertexture is sent into manipulator and is generated transmission modulation symbol, carries out rf modulations then through frequency hopping modulation device and sends to wireless channel。In the process carrying out frequency hopping modulation, first have to the carrier wave according to predetermined Hopping frequencies table synthesis corresponding frequencies, afterwards again by modulates information on carrier wave。At receiving terminal, receiver, firstly the need of carrying out frequency-hopping synchronization, synthesizes corresponding frequencies further according to Hopping frequencies table, adopts correlation demodulation method to demodulate signal code, then passes through information demodulator and demodulate information bit。Information bit sequence, after deinterleaver deinterleaves, is sent into fountain decoder and is decoded。The present embodiment adopts Raptor Global B P decoded mode, carries out the decoding of fountain codes and the decoding of LDPC simultaneously。After decoding, namely system has recovered transmission information。
If a part of frequency is interfered and cannot transmit data in channel, the part code character that transmitting terminal sends will be regarded as being deleted by channel or send imperfect, this makes the fountain coder of transmitting terminal need to be continuously generated code character transmitting, until receiving terminal receive abundant code character with reduce raw information time, sending feedback information to transmitting terminal, transmitting terminal carries out the transmission of next frame again。
In strong jamming wireless channel, the process of information is transmitted for novel frequency hopping fountain code system。Assuming that wireless channel receives broadband barrage jamming, cannot transmit information jamming bandwidth is α, and the frequency receiving interference will be unable to transmit normally information, processes with erasure channel model, and it is uncertain for looking closely the data of transmission on this frequency in reception。There is white Gaussian noise in channel, signal to noise ratio is SNR simultaneously。
It is as follows that a kind of frequency hopping fountain codes transmission method in the present embodiment implements step:
The frames of information bits that in step one, transmitter, group of information bits to be sent is become length to be N=4250 by signal source。
The precoding of step 2, Raptor coding adopts LDPC code, and code check is 0.85, owing to information frame code length is 4250 bits, therefore the code length K=5000 bit of each frame after coding。The degree distribution function of LT code adopts the Shokrollahi distribution after weakening, as shown in table 1, parameter k=65535, the meansigma methods a=5.87 of output symbol node degree。
The Raptor code output symbol node degree distribution that table 1 optimizes
| k | 65535 |
| Ω1 | 0.007969 |
| Ω2 | 0.493570 |
| Ω3 | 0.166220 |
| Ω4 | 0.072646 |
| Ω5 | 0.082558 |
| Ω8 | 0.056058 |
| Ω9 | 0.037229 |
| Ω19 | 0.055590 |
| Ω65 | 0.025023 |
| Ω66 | 0.003135 |
| ε | 0.038 |
| α | 5.87 |
In an encoding process, in order to ensure information after making an uproar through the deletion and adding of channel, receiving terminal can receive abundant code character to recover raw information, it is necessary to same code character is constantly encoded by fountain codes encoder, until can normal decoder beam back feedback information。
Step 3, the information bit sequence through fountain coding is carried out Bit Interleaved Coded Modulation。Bit interleaver adopts pseudo-random sequence formula to interweave。Modulates information mode is 4QAM。Length be the information frame of 5000 bits after Bit Interleaved Coded Modulation, therefore symbolic frame length is 1250 symbols, M=4；
Step 4, through ovennodulation information symbol frame enter frequency hopping modulation device carry out rf modulations。After modulation, signal becomes I, Q two-way。Generate intermediate-freuqncy signal through interpolation filter, wherein first to carry out base band interpolation, underway frequency interpolation。Intermediate frequency nominal frequency is 1MHz。Then carry out frequency hopping。Frequency hopping rate is 8kbps, and totally 64 frequencies randomly choose。Frequency hopping frequency is that 400MHz starts, and 1MHz is interval, until 500MHz, altogether 100 frequencies。Sample rate is 6MHz, and baseband data samples rate is 800kHz。Frequency hopping modulation device carries out frequency synthesis according to Hopping frequencies table, generates carrier frequency, intermediate-freuqncy signal is modulated on carrier wave。Wherein Hopping frequencies table is what prestore。
Radiofrequency signal is then transmitted in wireless channel。Assuming that the frequency being interfered is continuous print, namely on a certain Continuous Band, the signal of transmission is deleted。
Step 5, receiving terminal realize consistent with transmitting terminal clock by correcting local clock, namely realize synchronizing, make receiving terminal frequency hopping pattern, jump frequency sequence and bound-time all identical with transmitting terminal, and also realize the Pseudorandom code sequencer of interleaver synchronizing simultaneously。
Step 6, the Hopping frequencies table synthesis corresponding frequencies exported according to step 5, it is achieved frequency hopping demodulates, and obtains modulation symbol frame。
Step 7, modulation symbol sequence is inputted in demodulator and carry out 4QAM demodulation, obtain frames of information bits。According to the pseudo-random sequence Tong Bu with transmitting terminal, frames of information bits is deinterleaved。
Step 8, the frames of information bits of gained in step 7 being carried out fountain codes decoding, decoded mode adopts the decoding of BP overall situation fountain codes, the check-node information of LDPC is dissolved in the decoding process of LT。It specifically comprises the following steps that
A) zero padding before the code word that Raptor decoder receives, the number of zero is equal to the LDPC check information length produced；
B) by the position of 1 in the row weight of LDPC check matrix H and matrix, and the degree in conjunction with LT code is distributed, and sets up joint degree distribution mapping table；
C) utilize this joint degree distribution mapping table, adopt the BP of LT to decode process, translate intermediate sequence Xi, and remove check information therein and obtain source information symbol Si。
After sufficient number of fountain decodes, accept information frame and eliminate all uncertain bits, then send feedback information to information source, it is desirable to information source sends next frames of information bits。
Repeat said process, namely complete the transmission of message file。
The simulation result figure of the Bit Interleave frequency hopping fountain code system in the embodiment of the present invention is as shown in Figure 3 and Figure 4。In wireless channel, 430MHz to 460MHz frequency range is disturbed, jamming bandwidth α=0.3。SNR ranges 8～12dB。Numerical value in emulation be all through 20 times, each 106The data volume of bit carries out emulating and on average obtain。
Fig. 3 is the comparison of two kinds of system bit error rates, there it can be seen that adopt the frequency hopping fountain codes technology of novel interleaving technology to be better than the system of the novel interleaving technology not adopted on bit error rate。Owing to adopting novel interleaving technology not reduce the speed of information transmission, the lifting in this bit error rate is considerable。
Fig. 4 is the comparison being successfully decoded required fountain code character transmission times when signal to noise ratio is 10dB。It can be seen that can reduce the number of times that fountain code character sends after adopting novel interleaving technology, this improves the speed of information transmission another angle。
Summary two point, adopts the frequency hopping more former algorithm of fountain codes technology of novel interleaving technology to have bigger lifting in bit error rate and the rate of information throughput, only increases less complexity simultaneously, with the obvious advantage compared with former algorithm。
The above is presently preferred embodiments of the present invention, and the present invention should not be limited to this embodiment and accompanying drawing disclosure of that。Every without departing from the equivalence completed under spirit disclosed in this invention or amendment, both fall within the scope of protection of the invention。
Claims (1)
1. a frequency hopping fountain code system, including transmitter, channel and receiver three part:
Wherein, transmitter includes signal source, fountain channel coding module, interleaving block, modulation module and frequency hopper module；
Channel is continuous/random erasure channel；
Receiver includes dehop module, information demodulation module, de-interleaving block, fountain channel decoding module and decision statistic module；
Transmitter is connected with channel, and channel is connected with receiver；In transmitter, fountain channel coding module is passed in the output of signal source, and interleaving block is passed in the output of fountain channel coding module, and modulation module is passed in the output of interleaving block, and frequency hopper module is passed in the output of modulation module；In receiver, demodulation module is passed in the output of dehop module, and de-interleaving block is passed in the output of demodulation module, and fountain channel decoding module is passed in the output of de-interleaving block, it is characterised in that the step of its transmission method is as follows:
In step one, transmitter, information bit to be sent is formed the frames of information bits that several length are N-bit by signal source；
The frames of information bits generated in step one is carried out fountain coding by step 2, fountain channel coding module, and the fountain coding frame length of generation is K bit；Current information bit frame is constantly carried out fountain coding and produces fountain coding frame by encoder, until receiving what receiving terminal was sent feedback information, starts the fountain coding to next frames of information bits；
Wherein, the fountain coding described in step 2 adopts LT code or Raptor code；
The fountain coding frame produced after being encoded in step 2 is delivered in Bit interleaving block by step 3, fountain channel coding module, carries out Bit Interleave in units of a frame of fountain codes coding；Coded frame through Bit Interleave being generated according to the planisphere of MQAM modulation type subsequently and send symbolic frame, wherein M represents the exponent number of QAM modulation；The symbolic frame length generated after MQAM modulates is K/M symbol；
Step 4, by the symbolic frame that generates in step 3 by frequency hopping modulation device, according to Hopping frequencies table data symbol delivered to and different Frequency points sends out, arrive receiving terminal through wireless channel；
Step 5, receiving terminal realize reaching consistent with transmitting terminal clock by correcting local clock, it is achieved synchronizing process, make the jump frequency sequence of receiving terminal and bound-time all identical with transmitting terminal, obtain the frequency hopping pattern consistent with transmitting terminal；
Step 6, receiving terminal, by arriving the signal generation receiving symbol frame of receiving terminal in step 4 through wireless channel, are multiplied with the frequency hopping pattern generated in step 4, complete the Frequency Hopping Signal solution received is jumped, obtain the symbolic frame that length is K/M；
The symbolic frame generated in step 6 is demodulated by step 7, receiving terminal, obtains receiving bit information frame, and the length of frame is K bit；Receiving bit information frame and enter the de-interleaving block corresponding with transmitting terminal, bit information is deinterleaved, deinterleaving length is K bit；
Step 8, gained in step 7 is deinterleaved after bit information frame carry out fountain codes decoding, and detect wherein whether also have uncertain bit: if still having uncertain bit, then continue the fountain decoding of this frame；If there is no uncertain bit after detection, then send feedback information to signal source, it is desirable to signal source sends next frames of information bits；
Namely the transmission work of one frame of fountain codes frequency-hopping communication system is completed through above-mentioned eight steps。
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| US10873941B2 (en) | 2014-05-16 | 2020-12-22 | Huawei Technologies Co., Ltd. | System and method for joint transmission over licensed and unlicensed bands using fountain codes |
| US10536386B2 (en) | 2014-05-16 | 2020-01-14 | Huawei Technologies Co., Ltd. | System and method for dynamic resource allocation over licensed and unlicensed spectrums |
| CN104993905B (en) * | 2015-05-19 | 2018-02-13 | 南京航空航天大学 | The degree distribution optimization method and coding and decoding method of system LT code under erasure channel |
| CN106211143B (en) * | 2016-07-13 | 2019-07-23 | 西安交通大学 | A kind of safe transmission discrete power control method based on fountain codes |
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| CN107947804A (en) * | 2017-12-14 | 2018-04-20 | 厦门理工学院 | A kind of interpretation method and its device of LT codes |
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| CN109039538B (en) * | 2018-08-01 | 2020-04-21 | 北京理工大学 | Prime number family joint interleaving method for coherent fast frequency hopping system |
| CN109088699B (en) * | 2018-08-29 | 2020-11-27 | 同济大学 | Matching method for Raptor code degree distribution and high-order modulation mapping mode |
| CN109547060B (en) * | 2018-11-22 | 2021-03-19 | 北京睿信丰科技有限公司 | Frequency hopping spread spectrum signal transmitting device, frequency hopping spread spectrum signal receiving device, frequency hopping spread spectrum communication system and frequency hopping spread spectrum communication method |
| CN109547119B (en) * | 2018-12-15 | 2021-08-24 | 华南理工大学 | Anti-interference information transmission method based on inaudible audio hidden channel |
| CN109412647A (en) * | 2019-01-08 | 2019-03-01 | 北京慧清科技有限公司 | A kind of frequency-hopping method suitable for scatter communication system |
| CN109819438B (en) * | 2019-03-18 | 2021-10-15 | 中北大学 | Fountain coding wireless data secure transmission method based on AES encryption |
| CN112073086B (en) * | 2019-05-22 | 2021-06-04 | 电信科学技术研究院有限公司 | Method and system for determining frequency hopping pattern |
| CN111225360B (en) * | 2020-04-17 | 2020-09-08 | 北京全路通信信号研究设计院集团有限公司 | Narrow-band wireless communication system and method |
| CN111934714B (en) * | 2020-07-21 | 2022-04-12 | 桂林理工大学 | Anti-interference communication method and device |
| CN113612586B (en) * | 2021-08-24 | 2022-05-13 | 北京理工大学 | Low-delay channel coding method combining LT code and multiple connections |
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