CN104243084B - Error correction coding/decoding method and its device applied to human body communication channel - Google Patents

Error correction coding/decoding method and its device applied to human body communication channel Download PDF

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CN104243084B
CN104243084B CN201310226302.6A CN201310226302A CN104243084B CN 104243084 B CN104243084 B CN 104243084B CN 201310226302 A CN201310226302 A CN 201310226302A CN 104243084 B CN104243084 B CN 104243084B
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data flow
human body
body communication
chaudhuri
bose
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CN201310226302.6A
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CN104243084A (en
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聂泽东
戴荣新
胡必祥
陈弘
罗德军
段长江
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中国科学院深圳先进技术研究院
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Abstract

The present invention relates to a kind of error correction coding/decoding methods applied to human body communication channel, in turn include the following steps:Bose-Chaudhuri-Hocquenghem Code is carried out to input traffic;Data flow after Bose-Chaudhuri-Hocquenghem Code is carried out to be inserted into synchronous regime word processing;Random block interleaved coding is carried out to the data flow after being inserted into synchronous regime word processing;Data flow after random block interleaved coding is modulated;Human body communication transmission will be passed through by modulated data flow;It receives the data flow by human body communication transmission and is demodulated;Detect it is demodulated after data flow synchronous regime word;Data flow after synchronous regime word detection process is deinterleaved;BCH decodings are carried out to the data flow after deinterleaving and are exported.The error correction coding/decoding method for being applied to human body communication channel meets the requirement corrected to random error and burst error.In addition, additionally providing a kind of error correction encoding/decoding device applied to human body communication channel, random error and burst error can be corrected.

Description

Error correction coding/decoding method and its device applied to human body communication channel

Technical field

The present invention relates to wireless body area network fields, more particularly to a kind of error correction coding/decoding applied to human body communication channel Method and its device.

Background technology

With the fast development of modern science and technology, digital communication has been deep into the every aspect of human society life.It is full Foot miscellaneous application requirement, various Novel Communication modes emerge one after another.Human body communication is exactly a kind of novel with human body Communication as signal communication media.No matter living in medical treatment & health field or routine work, human body communication is all Have broad application prospects.But due to the variation of the movement of people and application environment, signal is transmitted across human body communication channel Random error is not only had in journey, but also is also likely to be present burst error, and the mistake in these transmission processes can seriously affect people The communication quality of body communication.The baseband system for thus how designing suitable human body communication, ensures validity, the reliability of information As urgent problem to be solved.

Wireless body area network(Body Area Network, BAN)It is a kind of sensor network in human body proximal end, by one A little sensing nodes and a body main website with communication function(Or BAN coordinators)Composition.In 2012, wireless body area network Codes and standards IEEE(Institute of Electrical and Electronics Engineers, electric electronic engineering Shi Xiehui)802.15.6 promulgating.Human body communication(Human Body Communication, HBC)Technology is as wireless body area network One of physical-layer techniques be increasingly valued by people.The human body communication system of early stage is fairly simple, some even without Code correcting capacity.And being more increasingly taken seriously with complexity, the related work of channel error correction coding extensively with application. The coding of mainstream has BCH code in being encoded at present to channel error correction(BCH code be derived from Bose, Ray-Chaudhuri with The abbreviation of Hocquenghem is that a kind of more coding method is studied to obtain in coding theory especially error correcting code), RS codes (Reed-solomon codes, inner institute's code), convolutional code, Turbo code(It is logical in outer space satellite that Turbo code is that one kind is applied Letter and designer, which find completion maximum information, transmits through a limitation bandwidth communications link in face of the noise of data corruption The high-performance error correction code of other wireless communications application programs)And LDPC code(Low Density Parity Check Code are low Density parity check code)Deng.It is various to encode the application scenario for having its different.And the channel coding of body area network physical layer mostly uses Common BCH code.BCH code is a kind of good linear block codes.However the existing Bose-Chaudhuri-Hocquenghem Code skill for human body communication channel Art is only capable of having good error correcting capability to random error, and it is impossible to meet the requirements to burst error correction.

Invention content

Based on this, it is necessary to provide a kind of application that can meet the requirement corrected to random error and burst error simultaneously In the error correction coding/decoding method and its device of human body communication channel.

A kind of error correction coding/decoding method applied to human body communication channel in turn includes the following steps:

Bose-Chaudhuri-Hocquenghem Code is carried out to input traffic;

Data flow after Bose-Chaudhuri-Hocquenghem Code is carried out to be inserted into synchronous regime word processing;

Random block interleaved coding is carried out to the data flow after being inserted into synchronous regime word processing;

Data flow after random block interleaved coding is modulated;

Human body communication transmission will be passed through by modulated data flow;

It receives the data flow by human body communication transmission and is demodulated;

Detect it is demodulated after data flow synchronous regime word;

Data flow after synchronous regime word detection process is deinterleaved;

BCH decodings are carried out to the data flow after deinterleaving and are exported.

In one of the embodiments, in described the step of carrying out Bose-Chaudhuri-Hocquenghem Code to input traffic, using parallel synchronous Coding mode encodes input data.

Further include as follows in one of the embodiments, before described the step of carrying out Bose-Chaudhuri-Hocquenghem Code to input traffic Step:

It receives input traffic and input traffic is stored in buffer.

The step being modulated in one of the embodiments, in the described pair of data flow after random block interleaved coding In rapid, the data flow after random block interleaved coding is modulated using BPSK modulation methods;In the reception by human body The data flow of traffic channel and the step of demodulated in, using BPSK demodulation methods to the number by human body communication transmission It is demodulated according to stream.

The data flow at described pair after deinterleaving carries out the step of BCH decodings and output in one of the embodiments, In rapid, the data flow decoded by BCH is exported according to the rule of first in, first out.

A kind of error correction encoding/decoding device applied to human body communication channel, including be linked in sequence successively Bose-Chaudhuri-Hocquenghem Code device, insert Enter synchronous regime word modules, Radom block interleaver, modulator, demodulator, synchronous regime word detector, deinterleaver and BCH decoders, the Bose-Chaudhuri-Hocquenghem Code device carry out Bose-Chaudhuri-Hocquenghem Code to input traffic, and the insertion synchronous regime word modules are to passing through Data flow after Bose-Chaudhuri-Hocquenghem Code carries out being inserted into synchronous regime word processing, and the Radom block interleaver is to by being inserted into synchronous regime Data flow after word processing carries out random block interleaved coding, and the modulator is to the data after random block interleaved coding Stream is modulated, and by modulated data flow by human body communication transmission, the demodulator reception is believed by human body communication Road transmission data flow simultaneously demodulated, the synchronous regime word detector detect it is demodulated after data flow synchronous regime Word, the deinterleaver are deinterleaved the data flow after synchronous regime word detection process, and the BCH decoders are to warp The data flow crossed after deinterleaving carries out BCH decodings.

The error correction encoding/decoding device applied to human body communication channel further includes control in one of the embodiments, Device, the Bose-Chaudhuri-Hocquenghem Code device include 32 Bose-Chaudhuri-Hocquenghem Code branches, and 32 Bose-Chaudhuri-Hocquenghem Code branches are connected with parallel way, the control Device processed is respectively connected to 32 Bose-Chaudhuri-Hocquenghem Code branches, and under the control of the controller, 32 Bose-Chaudhuri-Hocquenghem Code branches use same One clock and reset signal, 32 Bose-Chaudhuri-Hocquenghem Code branches are independently serially connected with the insertion synchronous regime word modules, institute The insertion synchronous regime word modules that controller is respectively connected to 32 Bose-Chaudhuri-Hocquenghem Code branch road concatenations are stated, in the control of the controller Under system, the synchronous regime word modules that are inserted into are to be inserted into synchronous regime word per the data flow of the output of Bose-Chaudhuri-Hocquenghem Code branch all the way.

The error correction encoding/decoding device applied to human body communication channel further includes caching in one of the embodiments, Device, the buffer are connected with the Bose-Chaudhuri-Hocquenghem Code device input terminal, and the buffer is for receiving input data and being stored.

The modulator and demodulator is respectively BPSK modulators and BPSK demodulators, institute in one of the embodiments, It states BPSK modulators and BPSK modulation is carried out to the data flow after random block interleaved coding, the BPSK demodulators are to by people The data flow of body communication transmission simultaneously carries out BPSK demodulation.

The output end of the BCH decoders is connected with data fifo buffer, the FIFO in one of the embodiments, The sequencing that data buffer is inputted according to data in an orderly manner exports output data.

Above application carries out Bose-Chaudhuri-Hocquenghem Code and random point in the error correction coding/decoding method of human body communication channel to input traffic Group interweaving encoding, later decodes data stream accordingly, has to random error wherein carrying out Bose-Chaudhuri-Hocquenghem Code to input traffic There is good error correcting capability, and random block interleaved coding has good error correcting capability, therefore above application to burst error The requirement corrected to random error and burst error is met in the error correction coding/decoding method of human body communication channel simultaneously.In addition, A kind of error correction encoding/decoding device applied to human body communication channel is additionally provided, random error can be not only corrected, can also entangle Positive burst error.

Description of the drawings

Fig. 1 is the flow chart of the error correction coding/decoding method applied to human body communication channel of one embodiment;

Fig. 2 is the structural schematic diagram of the error correction encoding/decoding device applied to human body communication channel of one embodiment;

Fig. 3 is the structural schematic diagram of the Bose-Chaudhuri-Hocquenghem Code device of one embodiment.

Specific implementation mode

In order to which the Bose-Chaudhuri-Hocquenghem Code technology for solving currently used for human body communication channel is only capable of having good error correction to random error Ability the problem of but cannot effectively be corrected to burst error, being applied to human body communication present embodiments provide for one kind and believes The error correction coding/decoding method in road.With reference to specific embodiment, to the error correction coding/decoding method applied to human body communication channel It is specifically described.

Referring to FIG. 1, the error correction coding/decoding method applied to human body communication channel that present embodiment provides includes as follows Step:

Step S100:It receives input traffic and input traffic is stored in buffer.Buffer is for temporarily storing Input traffic can be according to actual needs delay process input traffic without being handled in real time input traffic.

Step S110:Bose-Chaudhuri-Hocquenghem Code is carried out to input traffic.In present embodiment, in step s 110, using parallel same Step coding mode encodes input traffic.The period of coding and decoding can be reduced using parallel synchronous coding mode, improved The efficiency of coding.

Step S120:Data flow after Bose-Chaudhuri-Hocquenghem Code is carried out to be inserted into synchronous regime word processing.It is inserted into synchronous regime word Effect be to maintain the synchronization of data flow, avoid data flow from losing.

Step S130:Random block interleaved coding is carried out to the data flow after being inserted into synchronous regime word processing.Logical During letter, since human body communication channel may be will produce longer error burst by external interference or channel fading etc., adopt Error code discretization, receiving terminal can be made to eliminate random difference with the coding techniques for correcting random error with random block interleaved coding Mistake can improve the transmission quality of signal.

Step S140:Data flow after random block interleaved coding is modulated.In general, the letter of signal source Breath(Also referred to as information source)Contain DC component and the lower frequency component of frequency, referred to as baseband signal.Baseband signal tends not to It is directly transmitted in the channel as transmission signal, it is therefore necessary to which baseband signal is changed into one with respect to frequency for baseband frequency Very high signal is to be suitable for transmitting in channel.In the present embodiment, using BPSK(Binary Phase Shift Keying, binary phase shift keying)Modulation method carries out BPSK modulation to the data flow after random block interleaved coding, from And the data flow after random block interleaved coding is made to be suitble to transmit in human body communication channel.

Step S150:Human body communication transmission will be passed through by modulated data flow.

Step S160:It receives the data flow by human body communication transmission and is demodulated.In the present embodiment, by people The data flow of body communication transmission is BPSK data flows, therefore is demodulated to BPSK data flows using BPSK demodulation methods.

Step S170:Detect it is demodulated after data flow synchronous regime word.

Step S180:Data flow after synchronous regime word detection process is deinterleaved.

Step S190:BCH decodings are carried out to the data flow after deinterleaving and are exported.

Above application carries out Bose-Chaudhuri-Hocquenghem Code and random point in the error correction coding/decoding method of human body communication channel to input traffic Group interweaving encoding, later decodes data stream accordingly, has to random error wherein carrying out Bose-Chaudhuri-Hocquenghem Code to input traffic There is good error correcting capability, and random block interleaved coding has good error correcting capability, therefore above application to burst error The requirement corrected to random error and burst error is met in the error correction coding/decoding method of human body communication channel simultaneously.

With above application in the error correction coding/decoding method of human body communication channel, present embodiment additionally provides a kind of application In the error correction encoding/decoding device of human body communication channel.Referring to FIG. 2, the error correction encoding/decoding device packet applied to human body communication channel It includes buffer 210, Bose-Chaudhuri-Hocquenghem Code device 220, be inserted into synchronous regime word modules 230, Radom block interleaver 240, BPSK modulators 250, BPSK demodulators 260, synchronous regime word detector 270, deinterleaver 280 and BCH decoders 290.

Buffer 210, Bose-Chaudhuri-Hocquenghem Code device 220, be inserted into synchronous regime word modules 230, Radom block interleaver 240 and BPSK modulators 250 are sequentially connected in series.250 output end of BPSK modulators is connected to human body communication channel.Input data is from buffer 210 inputs pass through Bose-Chaudhuri-Hocquenghem Code device 220, are inserted into synchronous regime word modules 230, Radom block interleaver 240 and BPSK successively Modulator 250 simultaneously enters human body communication channel.Wherein, buffer 210 is for receiving input traffic and being stored.BCH is compiled Code device 220 carries out Bose-Chaudhuri-Hocquenghem Code to input traffic.Synchronous regime word modules 230 are inserted into flow into the data after Bose-Chaudhuri-Hocquenghem Code Row is inserted into synchronous regime word processing, and the synchronization for keeping data flow avoids data flow from losing.Radom block interleaver 240 is right Data flow after being inserted into synchronous regime word processing carries out random block interleaved coding.After random block interleaved coding Data flow is modulated using BPSK modulators 250, is obtained BPSK data flows and is entered human body communication channel.

Referring to FIG. 3, the error correction encoding/decoding device applied to human body communication channel further includes controller 300.Bose-Chaudhuri-Hocquenghem Code device 220 include 32 Bose-Chaudhuri-Hocquenghem Code branches.32 Bose-Chaudhuri-Hocquenghem Code branches are connected with parallel way.Controller 300 is respectively connected to 32 Bose-Chaudhuri-Hocquenghem Code branch, under the control of controller 300,32 Bose-Chaudhuri-Hocquenghem Code branches use the same clock and reset signal, to The period for reducing coding and decoding improves the efficiency of coding.In addition, 32 Bose-Chaudhuri-Hocquenghem Code branches are serially connected with insertion synchronous regime Word modules 230.Controller 300 is respectively connected to the insertion synchronous regime word modules 230 of 32 Bose-Chaudhuri-Hocquenghem Code branch road concatenations, Under the control of the controller 300, synchronous regime word modules 230 are inserted into be inserted per the data flow of the output of Bose-Chaudhuri-Hocquenghem Code branch all the way Enter synchronous regime word.

BPSK demodulators 260, synchronous regime word detector 270, deinterleaver 280 and BCH decoders 290 are gone here and there successively It connects.260 input terminal of BPSK demodulators is connected to human body communication channel.It is passed through successively by the BPSK data flows of human body communication transmission Cross BPSK demodulators 260, synchronous regime word detector 270, deinterleaver 280 and BCH decoders 290.Wherein, BPSK is demodulated Device 260, synchronous regime word detector 270, deinterleaver 280 and BCH decoders 290 are for obtaining BPSK data streams Output data.In the present embodiment, the output end of BCH decoders 290 is connected with FIFO(First Input First Output, first in, first out)Data buffer.Data fifo buffer exports number in an orderly manner according to the sequencing that data input According to.

BCH decoders 290 are briefly described below, the decoded processes of BCH are carried out to the data flow after deinterleaving. The data flow for defining 290 input terminal of BCH decoders is receiverd polynomial r(x).Decoding step of the BCH decoders 290 to data flow For by receiverd polynomial r(x)Calculate syndrome S=(S1,S2…,S2t), if S=0, shows to receive information and send information one Sample, inerrancy need not iteratively solve error location polynomial.If S ≠ 0, then by correcting subcomponent S1,S2…,S2tIt determines Error location polynomial σ (X).The root of σ (X) is solved, that is, determines errors present number β12…βv, and correct r(X) mistake in. If transmission code is v (x), e (x) is error pattern, then r (x)=v (x)+e (x).Because of α12,…,α2tIt is generator polynomial Root.

Si=r (α)=r0+r1αi+r2α2i+…+rn-1α(n-1)i=(... ((rn-1αi+rn-2i+rn-3i+…)αi+r0(1)

By formula(1)The then readily available hardware circuit for calculating syndrome S.

BCH code decoding key is to determine error location polynomial σ (X).The BCH of this secondary design is decoded using common Solve the riBM algorithms optimized on error polynomial BM (Boyer-Moore) algorithm.Without inverting, hardware configuration is simplified, together Shi Suoxu iteration is the half of primal algorithm.Pseudocode after optimization is as follows:

Wherein, B(j)For interim error location polynomial register, and l (j+1) indicates σ(j+1)(x) highest term coefficient.

In present embodiment, in Bose-Chaudhuri-Hocquenghem Code step, code fetch a length of 31, the BCH that information bit is 19(31,19,2)Code, BCH(31,19,2)Code is basis BCH(63,51,2)Shortening code.It is 32 to shorten length, that is, needs to increase in front 32 0 It can become BCH(63,51,2)Code.So should be since the 32nd when finding errors present, when search, only need to be by αiIt is substituted for αi+32.When original state, by σ032σ1(32*2)%63σ2, i.e. σ032σ11σ2It is loaded into register.The result finally obtained c(x)Data after as correcting.

Above application is in the error correction encoding/decoding device of human body communication channel, by Bose-Chaudhuri-Hocquenghem Code device 220 and Radom block interleaver 240 priorities carry out Bose-Chaudhuri-Hocquenghem Code to input data and random block interleaved encodes, then pass through deinterleaver 280 and BCH decoders 290 pairs of signals are decoded, and can not only correct random error, can also correct burst error.

The riBM algorithms in addition, improved nothing is inverted, compared with original BM algorithms, required iterations are reduced, algorithm speed Degree is faster.And since using random block interleaved technology, the random number generated every time is different from.In human body communication channel Middle transmission, which is equivalent to, to be played the role of encrypted, substantially increases the safety of information.

Several embodiments of the invention above described embodiment only expresses, the description thereof is more specific and detailed, but simultaneously Cannot the limitation to the scope of the claims of the present invention therefore be interpreted as.It should be pointed out that for those of ordinary skill in the art For, without departing from the inventive concept of the premise, various modifications and improvements can be made, these belong to the guarantor of the present invention Protect range.Therefore, the protection domain of patent of the present invention should be determined by the appended claims.

Claims (8)

1. a kind of error correction coding/decoding method applied to human body communication channel, which is characterized in that in turn include the following steps:
Bose-Chaudhuri-Hocquenghem Code is carried out to input traffic;
Data flow after Bose-Chaudhuri-Hocquenghem Code is carried out to be inserted into synchronous regime word processing;
Random block interleaved coding is carried out to the data flow after being inserted into synchronous regime word processing;
Data flow after random block interleaved coding is modulated;
Human body communication transmission will be passed through by modulated data flow;
It receives the data flow by human body communication transmission and is demodulated;
Detect it is demodulated after data flow synchronous regime word;
Data flow after synchronous regime word detection process is deinterleaved;
BCH decodings are carried out to the data flow after deinterleaving and are exported;
Further include following steps before described the step of carrying out Bose-Chaudhuri-Hocquenghem Code to input traffic:
It receives input traffic and input traffic is stored in buffer and carry out BCH to obtain input traffic from buffer Coding;
The BCH decodings are using to commonly solving the riBM algorithms after error polynomial BM algorithms optimize.
2. the error correction coding/decoding method according to claim 1 applied to human body communication channel, which is characterized in that described In the step of carrying out Bose-Chaudhuri-Hocquenghem Code to input traffic, input data is encoded using parallel synchronous coding mode.
3. the error correction coding/decoding method according to claim 1 applied to human body communication channel, which is characterized in that described In the step of being modulated to the data flow after random block interleaved coding, using BPSK modulation methods to by random grouping Data flow after interweaving encoding is modulated;In the step for receiving the data flow by human body communication transmission and being demodulated In rapid, the data flow by human body communication transmission is demodulated using BPSK demodulation methods.
4. the error correction coding/decoding method according to claim 1 applied to human body communication channel, which is characterized in that described In the step of carrying out BCH decodings to the data flow after deinterleaving and exporting, the data flow decoded by BCH is according to elder generation Enter the rule output first gone out.
5. a kind of error correction encoding/decoding device applied to human body communication channel, which is characterized in that including the BCH being linked in sequence successively Encoder is inserted into synchronous regime word modules, Radom block interleaver, modulator, demodulator, synchronous regime word detector, solution friendship Device and BCH decoders are knitted, the Bose-Chaudhuri-Hocquenghem Code device carries out Bose-Chaudhuri-Hocquenghem Code, the insertion synchronous regime word modules to input traffic Data flow after Bose-Chaudhuri-Hocquenghem Code is carried out to be inserted into synchronous regime word processing, the Radom block interleaver is to same by being inserted into It walks status word treated data flow and carries out random block interleaved coding, the modulator is to after random block interleaved coding Data flow be modulated, by modulated data flow by human body communication transmission, the demodulator is received by human body The data flow of traffic channel is simultaneously demodulated, the synchronous regime word detector detect it is demodulated after data flow it is same Status word is walked, the deinterleaver is deinterleaved the data flow after synchronous regime word detection process, the BCH decodings Device carries out BCH decodings to the data flow after deinterleaving;The error correction encoding/decoding device applied to human body communication channel is also Including buffer, the buffer is connected with the Bose-Chaudhuri-Hocquenghem Code device input terminal, and the buffer is for receiving input traffic simultaneously It is stored, Bose-Chaudhuri-Hocquenghem Code is carried out to obtain input traffic from buffer;
The BCH decodings are using to commonly solving the riBM algorithms after error polynomial BM algorithms optimize.
6. the error correction encoding/decoding device according to claim 5 applied to human body communication channel, which is characterized in that described to answer Error correction encoding/decoding device for human body communication channel further includes controller, and the Bose-Chaudhuri-Hocquenghem Code device includes 32 Bose-Chaudhuri-Hocquenghem Code branch Road, 32 Bose-Chaudhuri-Hocquenghem Code branches are connected with parallel way, and the controller is respectively connected to 32 Bose-Chaudhuri-Hocquenghem Code branches, in institute Under the control for stating controller, 32 Bose-Chaudhuri-Hocquenghem Code branches use the same clock and reset signal, 32 Bose-Chaudhuri-Hocquenghem Codes Branch is independently serially connected with the insertion synchronous regime word modules, and the controller is respectively connected to 32 Bose-Chaudhuri-Hocquenghem Code branches The insertion synchronous regime word modules of upper concatenation, under the control of the controller, the insertion synchronous regime word modules are each The data flow of road Bose-Chaudhuri-Hocquenghem Code branch output is inserted into synchronous regime word.
7. the error correction encoding/decoding device according to claim 5 applied to human body communication channel, which is characterized in that the tune Device and demodulator processed are respectively BPSK modulators and BPSK demodulators, and the BPSK modulators by random block interleaved to encoding Data flow afterwards carries out BPSK modulation, and the BPSK demodulators are to the data flow by human body communication transmission and carry out BPSK solutions It adjusts.
8. the error correction encoding/decoding device according to claim 5 applied to human body communication channel, which is characterized in that described The output end of BCH decoders is connected with data fifo buffer, and the priority that the data fifo buffer is inputted according to data is suitable Sequence in an orderly manner exports output data.
CN201310226302.6A 2013-06-07 2013-06-07 Error correction coding/decoding method and its device applied to human body communication channel CN104243084B (en)

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