CN101399633A - Interference resisting method combining Reed-Solomon code with grid coding modulation technique - Google Patents

Interference resisting method combining Reed-Solomon code with grid coding modulation technique Download PDF

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CN101399633A
CN101399633A CNA2008101217602A CN200810121760A CN101399633A CN 101399633 A CN101399633 A CN 101399633A CN A2008101217602 A CNA2008101217602 A CN A2008101217602A CN 200810121760 A CN200810121760 A CN 200810121760A CN 101399633 A CN101399633 A CN 101399633A
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data
solomon code
modulation technique
signal
interference
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CN101399633B (en
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杨丽萍
赵民建
王志雄
王培雅
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Zhejiang University ZJU
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Zhejiang University ZJU
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Abstract

The invention discloses an anti-interference method combining the Reed-Solomon (RS) code with the Trellis Coded Modulation (TCM) technique. The method comprises the following steps: (1) obtaining source data from a data source; (2) encoding the source data by an RS product encoder and a TCM encoder at a transmitting end; (3) Modulating the encoded data into a Phase Shift Keying (PSK) signal; (4) transmitting two modulation signals including an isodirectional component (I) and a quadrature component (Q) of the PSK on a communication channel; (5) receiving the transmitted signals, and carrying out Viterbi decoding, TCM recoding and comparative decision on the two signals including the I and the Q; and (6) transmitting the Viterbi decoding data and the decision information to the RS decoder for decoding, and recovering the transmitted source data. In a frequency hopping transmission system, the method better distinguishes random bit interference and burst hopping interference, improves the system error correction capability, and solves the conflict between the channel encoding efficiency and the communication reliability of the frequency hopping transmission system.

Description

In-Solomon code is in conjunction with the anti-interference method of grid coding modulation technique
Technical field
The present invention relates to the field of digital communication, more particularly, relate in a kind of-Solomon code is in conjunction with the anti-interference method of grid coding modulation technique.
Background technology
Frequency hopping is a type in the spread spectrum communication system, and it has good interference free performance, has obtained extensive use in the military communication field.The operation principle of frequency hopping is to constitute the carrier frequency that frequency hopping pattern is controlled each moment with pseudo-code sequence, makes its saltus step fast in the good frequency of the predefine of one group of fixed number, thereby hides interference, reaches the purpose of signal reliable transmission.In the frequency hopping communications process, except meeting is subjected to white Gaussian noise (AWGN) influence, more can be subjected to the influence of jam signal, especially all the more so in the particular surroundings of battlefield communication.
The channel error correction coding can effectively be corrected in the frequency hopping transmission system by disturbing the mistake of being introduced, but existing anti-interference method is applicable to the antagonism white Gauss noise more, for the artificial disturbance of burst, its error correcting capability is subjected to certain limitation, does not often reach the successful preferably probability of acceptance.
Problem-Error is jumped in the anti-random bit mistake and the anti-burst that the present invention is directed to frequency-hopping system, has proposed the anti-interference method of a kind of RS sign indicating number in conjunction with the TCM technology, preferably resolves the problems referred to above, and has simply widely applicable advantage.
Summary of the invention
The objective of the invention is to overcome the deficiencies in the prior art, provide in a kind of-Solomon code is in conjunction with the anti-interference method of grid coding modulation technique.
In-Solomon code may further comprise the steps in conjunction with the anti-interference method of grid coding modulation technique:
1) obtains source data from data source;
2) with source data, through in the transmitting terminal-the product coding device of Solomon code and the encoder encodes of grid coding modulation technique;
3) will compile the sign indicating number data-modulated become phase shift keyed signal;
4) component in the same way, the quadrature component two-way modulation signal of transmission phase shift keyed signal on communication port;
5) receive the signal sent and the component in the same way that will receive, the quadrature component two paths of signals carries out the recodification of Viterbi decoding, grid coding modulation technique and relatively judgement;
6) in Viterbi decoding data and discriminative information are given-decoder for decoding of Solomon code, thereby recover the source data of transmission.
Described with source data, through getting in the transmitting terminal-the product coding device of Solomon code and the encoder encodes step of grid coding modulation technique:
1) in adopting two-Solomon code respectively to data block carry out vertical and horizontal in-the Solomon code coding, form the bidimensional product code, it is P that wrong probability of interference is jumped in the burst of supposing channel, the frequency hopping transmission system is a frame with the n jumping, in-error correcting capability of Solomon code is x, when being jumped the wrong jumping figure that disturbs smaller or equal to x by burst in the frame, receiving terminal is the energy correct decoding just so, in designing according to y-Solomon code, the correct probability y that receives is expressed as:
y = F ( x | n , p )
= n 0 p 0 ( 1 - p ) n + n 1 p 1 ( 1 - p ) ( n - 1 ) + · · · + n x p x ( 1 - p ) ( n - x )
= Σ i = 0 x n i p i ( 1 - p ) ( n - i ) I ( 0,1 , . . . , n ) ( i )
2) lining is got-data of sending of Solomon code coding carry out the grid coding modulation technique coding.
Signal that described reception sent and the component in the same way that will receive, quadrature component two paths of signals carry out the recodification and the comparison decision steps of Viterbi decoding, grid coding modulation technique:
Component in the same way, the quadrature component two paths of signals that 1) will receive are mapped on the planisphere, declare firmly by the zone to obtain data bit Z k 1
2) component in the same way, the quadrature component two paths of signals that receives carried out Viterbi decoding and obtain decoding data bit S k';
3) to S k' coding of grid coding modulation technique obtains data bit Z again k 2
4) Z of each jumping of comparison k 1And Z k 2, judge the number of errors of each jumping figure certificate, if number of errors surpasses certain thresholding M, just can equivalence think that a whole jumping figure disturbs according to all being jumped by burst, produces one by the expression signal p of burst jumping interference k=1, wherein k jumps number, on the contrary p k=0.
Described in Viterbi decoding data and discriminative information are given-decoder for decoding of Solomon code, thereby recover the source data step of transmission: with Viterbi decoding data S k' and a frame in the disturbed condition id signal P={p of each jumping 1, p 2, p 3In giving-decoder for decoding of Solomon code, thus recover the source data of transmission.
Described thresholding M is: the data that probability of occurrence=number of errors/one of number of errors jumps under the statistics random bit disturbs under a certain signal to noise ratio; The data that probability of occurrence=number of errors/one of number of errors jumped under the statistics burst was jumped and disturbed, two probability are drawn on same the statistical chart, article two, the focus of curve is exactly threshold value M, each individual character is made an uproar than corresponding statistical charts all, signal to noise ratio is high more, article two, the peak value of curve is just from must be far away more, and final M value selected is to choose under the successful probability of acceptance is 0.5 o'clock signal to noise ratio.
The present invention has distinguished random bit interference and burst preferably and has jumped interference in the frequency hopping transmission system, has strengthened the error correcting capability of system, has solved the chnnel coding efficient of frequency hopping transmission system and the contradiction of communication reliability; Because of the universality of this scheme, can apply to the frequency-hopping system of each speed simultaneously.
Description of drawings
Fig. 1 is the system block diagram according to embodiment of the present invention;
Fig. 2 is according to transmitting terminal RS coding schematic block diagram of the present invention;
Fig. 3 is according to receiving terminal decoding flow diagram of the present invention;
Fig. 4 is according to the TCM in embodiment of the present invention-8PSK encoder model;
Fig. 5 is according to declaring zoning plan firmly in embodiment of the present invention;
Fig. 6 is according to the error thresholds statistical chart in embodiment of the present invention;
Fig. 7 is according to the ber curve of embodiment of the present invention under random bit interference (awgn channel) condition;
Fig. 8 is according to the successful probability of acceptance performance curve of embodiment of the present invention under random bit interference (awgn channel) and burst jumping interference (10%) condition;
Fig. 9 is according to the successful probability of acceptance performance curve of embodiment of the present invention under random bit interference (awgn channel) and burst jumping interference (20%) condition;
Figure 10 is according to the successful probability of acceptance performance curve of embodiment of the present invention under random bit interference (awgn channel) and burst jumping interference (30%) condition;
Embodiment
The RS sign indicating number is (BCH) sign indicating number of the very strong multi-system of a class error correcting capability rich this (Bose), Cha Dehuli (Chaudhuri) and Huo Kun lattice nurse (Hocquenghem).TCM is a kind of will the coding and the technology of chopping phase combination.
The RS sign indicating number may further comprise the steps in conjunction with the anti-interference method of TCM technology:
1) obtains source data from data source;
2) with source data, through the RS product coding device and the TCM encoder encodes of transmitting terminal;
3) will compile the sign indicating number data-modulated become psk signal;
4) I, the Q two-way modulation signal of transmission PSK on communication port;
5) receive the signal sent and with I, the Q two paths of signals that receives carry out Viterbi decoding, TCM recodes and relatively judgement;
6) give RS decoder for decoding with Viterbi decoding data and discriminative information, thereby recover the source data of transmission.
Described with source data, the RS product coding device and the TCM encoder encodes step of process transmitting terminal:
1) adopt two RS sign indicating numbers respectively data block to be carried out vertical and horizontal RS coding, inserted the serial concatenation of codes of row-column interleaver in the middle of regarding as, form the bidimensional product code, the sign indicating number type design of RS must be considered channel circumstance, the interference of channel mainly contains the random bit interference and the burst jumping is disturbed, especially at the channel that has under the wrong interference of burst jumping.It is P that wrong probability of interference is jumped in the burst of supposing channel, and the frequency hopping transmission system is a frame with the n jumping, and the error correcting capability of RS sign indicating number is x, when being jumped the wrong jumping figure that disturbs smaller or equal to x when happening suddenly in the frame so, receiving terminal is the energy correct decoding just, designs the RS sign indicating number according to y, and the correct probability y that receives is expressed as:
y = F ( x | n , p )
= n 0 p 0 ( 1 - p ) n + n 1 p 1 ( 1 - p ) ( n - 1 ) + · · · + n x p x ( 1 - p ) ( n - x )
= Σ i = 0 x n i p i ( 1 - p ) ( n - i ) I ( 0,1 , . . . , n ) ( i )
2) data of sending of RS coding are carried out the TCM coding.
The signal that described reception sent and I, the Q two paths of signals that receives carried out that Viterbi decoding, TCM are recoded and decision steps relatively:
1) I, the Q two paths of signals that receives is mapped on the planisphere, declares firmly by the zone and obtain data bit Z k 1
2) I, the Q two paths of signals that receives carried out Viterbi decoding and obtain decoding data bit S k';
3) to S k' the TCM coding obtains data bit Z again k 2
4) Z of each jumping of comparison k 1And Z k 2, judge the number of errors of each jumping figure certificate, if number of errors surpasses certain thresholding M, just can equivalence think that a whole jumping figure disturbs according to all being jumped by burst, produces one by the expression signal p of burst jumping interference k=1, wherein k jumps number, on the contrary p k=0.
Describedly give RS decoder for decoding, thereby recover the source data step of transmission: with Viterbi decoding data S Viterbi decoding data and discriminative information k' and a frame in the disturbed condition id signal P={p of each jumping 1, p 2, p 3Give RS decoder for decoding, thus recover the source data of transmission.
Described thresholding M is: the data that probability of occurrence=number of errors/one of number of errors jumps under the statistics random bit disturbs under a certain signal to noise ratio; The data that probability of occurrence=number of errors/one of number of errors jumped under the statistics burst was jumped and disturbed, two probability are drawn on same the statistical chart, article two, the focus of curve is exactly threshold value M, each individual character is made an uproar than corresponding statistical charts all, signal to noise ratio is high more, article two, the peak value of curve is just from must be far away more, and final M value selected is to choose under the successful probability of acceptance is 0.5 o'clock signal to noise ratio.
The present invention realizes the high error correcting capability of frequency hopping transmission system under random bit interference and burst jumping interference environment, and obtains implementing checking on the hardware platform of XILINX VIRTEX-4 XC4VLX60.
As shown in Figure 1, a kind of system block diagram of the present invention.Data source module 101 is joined with RS product coding module 102, coder module 102 is joined with TCM coding module 103 again, the data of having compiled sign indicating number send to channel module 105 by modulator block 104, the signal that receiving terminal receives is finished demodulation in demodulator module 106, send into Viterbi decoding module 107, Viterbi decoding module 107 and the TCM judging module 108 of recoding is relatively joined, and gives RS decoding module 109 with data and errors present information at last and finishes decoding, recovers data source.
As shown in Figure 2, provided the RS coding schematic block diagram of transmitting terminal.Earlier data block is carried out vertical RS coding 201, carry out horizontal RS coding 202 again.
As shown in Figure 3, provided the decoding flow diagram of receiving terminal.The I, the Q two paths of signals that receive are mapped on the planisphere, declare module 301 firmly by the zone and obtain data bit Z k 1Simultaneously I, the Q two paths of signals that receives carried out Viterbi decoding 302 and obtain decoding data bit S k'; To S k' TCM coding 303 obtains data bit Z again k 2By comparing the relatively Z of each jumping of judging module 304 k 1And Z k 2, judge the number of errors of each jumping figure certificate, if number of errors surpasses certain certain threshold M, just can equivalence think that a whole jumping figure disturbs according to all being jumped by burst, produces one by the expression signal p of burst jumping interference k=1, wherein k jumps number, on the contrary p k=0; With Viterbi decoding data S k' and a frame in the disturbed condition id signal P={p of each jumping 1, p 2, p 3Give the RS decoder 305 decodings, recover initial data.
In an embodiment, at the frequency hopping transmission system of 128kbps speed, carry out the anti-interference conceptual design of cascade RS sign indicating number in conjunction with the TCM technology.
At first to the design of the sign indicating number type of RS, according to principle as can be known, it is p that wrong probability of interference is jumped in the burst of supposing channel, and the frequency hopping transmission system is a frame with the n jumping, and the error correcting capability of RS sign indicating number is x.When being jumped the wrong jumping figure that disturbs smaller or equal to x when happening suddenly in the frame so, receiving terminal is the energy correct decoding just.The correct probability y that receives is expressed as:
y = F ( x | n , p )
= n 0 p 0 ( 1 - p ) n + n 1 p 1 ( 1 - p ) ( n - 1 ) + · · · + n x p x ( 1 - p ) ( n - x )
= Σ i = 0 x n i p i ( 1 - p ) ( n - i ) I ( 0,1 , . . . , n ) ( i )
In an embodiment, n=26, p=0.3, (x|n p), obtains table 1 according to y=F.Find that the probability of success of anti-30% burst mistake can reach more than 95% when x 〉=12.
The correspondence table of x and y in table 1 example
X y X y
1 2 3 4 5 0.0011 0.0067 0.0260 0.0733 0.1626 10 11 12 13 14 0.8747 0.9397 0.9745 0.9906 0.9970
6 7 8 9 0.2965 0.4605 0.6274 0.7705 15 16 17 18-26 0.9991 0.9998 1.0000 1.0000
The TCM coded portion adopts TCM-8PSK systematic code, as shown in Figure 4.
The I, the Q two paths of signals that are modulated into 8PSK arrive receiving terminal by channel.
As shown in Figure 5, be to declare used zoning plan among the embodiment firmly, when the point of I, Q two paths of signals correspondence dropped on the zoning plan a certain zone, territory conduct that just should the zone was declared the result firmly and is exported.As shown in Figure 6, be the statistical chart of simulation result among the embodiment, abscissa is represented Z in the jumping k 1And Z k 2Different numbers are relatively promptly thought a number of errors in jumping, and ordinate is represented the probability that number of errors occurs, and the M value just is chosen to be error thresholds.Final M value selected is to compromise to choose under the successful probability of acceptance is signal to noise ratio snr=6.5dB of 0.5 o'clock.
As shown in Figure 7, provided the ber curve of above-mentioned specific embodiments of the present invention under random bit interference (awgn channel) condition.As shown in Figure 8, having provided above-mentioned specific embodiments of the present invention disturbs (awgn channel) and 10% burst to jump the successful probability of acceptance performance curve that disturbs under the condition concurrent at random bit.Referring to Fig. 9, provided above-mentioned specific embodiments of the present invention and disturbed (awgn channel) and 20% burst to jump the successful probability of acceptance performance curve that disturbs under the condition concurrent at random bit.As shown in figure 10, having provided above-mentioned specific embodiments of the present invention disturbs (awgn channel) and 30% burst to jump the successful probability of acceptance performance curve that disturbs under the condition concurrent at random bit.Method of the present invention as can be seen is very effective.
The present invention is the anti-interference method of a kind of RS sign indicating number in conjunction with the TCM technology.Method described here and circuit, single component separated from one another can be traditional fully, we require their combination is protected as invention.The above only is the embodiment of certain applications, but true spirit of the present invention and scope are not limited to this, any those of ordinary skill in the art can revise the concrete grammar of single component, realize the anti-interference conceptual design of the RS sign indicating number of different application occasion in conjunction with the TCM technology.The present invention is only limited by appended claim book and equivalence techniques scheme thereof, and we require these are protected as the present invention.

Claims (5)

  1. In one kind-Solomon code is in conjunction with the anti-interference method of grid coding modulation technique, it is characterized in that may further comprise the steps:
    1) obtains source data from data source;
    2) with source data, through in the transmitting terminal-the product coding device of Solomon code and the encoder encodes of grid coding modulation technique;
    3) will compile the sign indicating number data-modulated become phase shift keyed signal;
    4) component in the same way, the quadrature component two-way modulation signal of transmission phase shift keyed signal on communication port;
    5) receive the signal sent and the component in the same way that will receive, the quadrature component two paths of signals carries out the recodification of Viterbi decoding, grid coding modulation technique and relatively judgement;
    6) in Viterbi decoding data and discriminative information are given-decoder for decoding of Solomon code, thereby recover the source data of transmission.
  2. 2. according to claim 1 in a kind of-Solomon code is in conjunction with the anti-interference method of grid coding modulation technique, it is characterized in that described with source data, through transmitting terminal in-the product coding device of Solomon code and the encoder encodes step of grid coding modulation technique:
    1) in adopting two-Solomon code respectively to data block carry out vertical and horizontal in-the Solomon code coding, form the bidimensional product code, it is P that wrong probability of interference is jumped in the burst of supposing channel, the frequency hopping transmission system is a frame with the n jumping, in-error correcting capability of Solomon code is x, when being jumped the wrong jumping figure that disturbs smaller or equal to x by burst in the frame, receiving terminal is the energy correct decoding just so, in designing according to y-Solomon code, the correct probability y that receives is expressed as:
    y = F ( x | n , p )
    = n 0 p 0 ( 1 - p ) n + n 1 p 1 ( 1 - p ) ( n - 1 ) + · · · + n x p x ( 1 - p ) ( n - x )
    = Σ i = 0 x n i p i ( 1 - p ) ( n - i ) I ( 0,1 , . . . , n ) ( i )
    2) lining is got-data of sending of Solomon code coding carry out the grid coding modulation technique coding.
  3. 3. according to claim 1 in a kind of-Solomon code is in conjunction with the anti-interference method of grid coding modulation technique, it is characterized in that signal that described reception sends and the component in the same way that will receive, quadrature component two paths of signals carry out the recodification and the comparison decision steps of Viterbi decoding, grid coding modulation technique:
    Component in the same way, the quadrature component two paths of signals that 1) will receive are mapped on the planisphere, declare firmly by the zone to obtain data bit Z k 1
    2) component in the same way, the quadrature component two paths of signals that receives carried out Viterbi decoding and obtain decoding data bit S k';
    3) to S k' coding of grid coding modulation technique obtains data bit Z again k 2
    4) Z of each jumping of comparison k 1And Z k 2, judge the number of errors of each jumping figure certificate, if number of errors surpasses certain thresholding M, just can equivalence think that a whole jumping figure disturbs according to all being jumped by burst, produces one by the expression signal p of burst jumping interference k=1, wherein k jumps number, on the contrary p k=0.
  4. 4. according to claim 1 in a kind of-Solomon code is in conjunction with the anti-interference method of grid coding modulation technique, it is characterized in that described in Viterbi decoding data and discriminative information are given-decoder for decoding of Solomon code, thereby recover the source data step of transmission: with Viterbi decoding data S k' and a frame in the disturbed condition id signal P={p of each jumping 1, p 2, p 3In giving-decoder for decoding of Solomon code, thus recover the source data of transmission.
  5. 5. according to claim 3 in a kind of-Solomon code is in conjunction with the anti-interference method of grid coding modulation technique, it is characterized in that described thresholding M is: the data that probability of occurrence=number of errors/one of number of errors jumps under the statistics random bit disturbs under a certain signal to noise ratio; The data that probability of occurrence=number of errors/one of number of errors jumped under the statistics burst was jumped and disturbed, two probability are drawn on same the statistical chart, article two, the focus of curve is exactly threshold value M, each individual character is made an uproar than corresponding statistical charts all, signal to noise ratio is high more, article two, the peak value of curve is just from must be far away more, and final M value selected is to choose under the successful probability of acceptance is 0.5 o'clock signal to noise ratio.
CN200810121760A 2008-10-17 2008-10-17 Interference resisting method combining Reed-Solomon code with grid coding modulation technique Expired - Fee Related CN101399633B (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105429729A (en) * 2015-11-03 2016-03-23 西安烽火电子科技有限责任公司 Ultrashort wave CPTCM (Continuous Phase Trellis Coded Modulation) coherent demodulation method
CN108052828A (en) * 2017-12-26 2018-05-18 广东欧珀移动通信有限公司 Generation method, device, terminal and the storage medium of record screen file
CN115276906A (en) * 2022-07-25 2022-11-01 哲库科技(上海)有限公司 Data frame transmission method, device, chip, storage medium and Bluetooth equipment

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA2228714A1 (en) * 1997-04-03 1998-10-03 At&T Corp. Method and apparatus for spectral efficient transmission of cdma modulated signals

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105429729A (en) * 2015-11-03 2016-03-23 西安烽火电子科技有限责任公司 Ultrashort wave CPTCM (Continuous Phase Trellis Coded Modulation) coherent demodulation method
CN105429729B (en) * 2015-11-03 2018-11-09 西安烽火电子科技有限责任公司 A kind of ultrashort continuous phase Trellis-coded modulation coherent demodulation method
CN108052828A (en) * 2017-12-26 2018-05-18 广东欧珀移动通信有限公司 Generation method, device, terminal and the storage medium of record screen file
CN115276906A (en) * 2022-07-25 2022-11-01 哲库科技(上海)有限公司 Data frame transmission method, device, chip, storage medium and Bluetooth equipment
CN115276906B (en) * 2022-07-25 2024-04-05 哲库科技(上海)有限公司 Data frame transmission method, device, chip, storage medium and Bluetooth equipment

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