CN108667556A - Bit Interleaved Coded Modulation method and its deinterleaving decoding demodulation method - Google Patents

Bit Interleaved Coded Modulation method and its deinterleaving decoding demodulation method Download PDF

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CN108667556A
CN108667556A CN201710200896.1A CN201710200896A CN108667556A CN 108667556 A CN108667556 A CN 108667556A CN 201710200896 A CN201710200896 A CN 201710200896A CN 108667556 A CN108667556 A CN 108667556A
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bit
code word
interception
ldpc code
check
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CN108667556B (en
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张文军
徐胤
何大治
洪含绛
张根宁
王延峰
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Shanghai Jiaotong University
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
    • H04L1/0056—Systems characterized by the type of code used
    • H04L1/0057—Block codes
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
    • H04L1/0056—Systems characterized by the type of code used
    • H04L1/0071—Use of interleaving
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/32—Carrier systems characterised by combinations of two or more of the types covered by groups H04L27/02, H04L27/10, H04L27/18 or H04L27/26
    • H04L27/34—Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems
    • H04L27/36—Modulator circuits; Transmitter circuits
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/32—Carrier systems characterised by combinations of two or more of the types covered by groups H04L27/02, H04L27/10, H04L27/18 or H04L27/26
    • H04L27/34—Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems
    • H04L27/38—Demodulator circuits; Receiver circuits

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  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Error Detection And Correction (AREA)

Abstract

The present invention provides a kind of Bit Interleaved Coded Modulation methods for communication system, include that mother's LDPC code after coding interweaves by check bit, code word is intercepted, interweave to the code word procession after interception, according to bit permutation pattern into line replacement, constellation mapping is then carried out to obtain symbol stream.A kind of corresponding deinterleaving decoding demodulation method is provided simultaneously, and demapping processing is carried out to obtain bit data according to corresponding planisphere to symbol stream；The bit data is subjected to solution bit permutation according to corresponding bit permutation pattern, then carries out solution ranks and interweaves, and to the position zero padding of code word interception, then carries out solution even-odd check and interweaves with the bit data flow after being deinterleaved；LDPC decoding processing is carried out to obtain decoded bitstream data to the bit data flow.The present invention selects bit permutation pattern, system performance is made preferably to be promoted for specific interception code word and constellation mapping scheme.

Description

Bit Interleaved Coded Modulation method and its deinterleaving decoding demodulation method
Technical field
The present invention relates to communication code technical field, more particularly to a kind of bit-interleaved coded-modulation tune for communication system Method processed and its deinterleaving decoding demodulation method.
Background technology
In existing broadcast communication standard, LDPC codings, Bit Interleave and constellation mapping are most commonly seen coding tune Mode processed, in European second generation digital broadcast television transmission standard (DVB-T2), U.S.'s new-generation digital television standard (ATSC3.0) etc. such code modulation mode is all taken in communication systems.In different emission systems, LDPC codings, Bit Interleave and constellation mapping are required for carrying out individually designed, combined debugging, to obtain best channel performance.Therefore, how Pass through spy for the constellation mapping mode of the specific LDPC code word and selection of specific application scenarios and application demand design Fixed Bit Interleave mode obtains best channel performance, is a technical barrier of this field.
Currently without the explanation or report for finding technology similar to the present invention, it is also not yet collected into money similar both at home and abroad Material.
Invention content
Aiming at the above shortcomings existing in the prior art, the object of the present invention is to provide the bits in a kind of communication system Interleaved Coded Modulation method and its deinterleaving decoding demodulation method, the LDPC code for specific code check and specific constellation mapping Method selects corresponding bit permutation pattern in bit interleaving process, and the promotion of system performance is obtained in combined debugging.
To achieve the above object, the present invention is achieved by the following technical solutions.
According to an aspect of the invention, there is provided a kind of Bit Interleaved Coded Modulation method, includes the following steps：
First LDPC codings will be carried out for the code word of communication, obtains LDPC code word；
LDPC code word is subjected to Bit Interleave again, obtains the LDPC code word after Bit Interleave；
Constellation mapping is carried out according to corresponding planisphere to the LDPC code word after Bit Interleave, obtains symbol stream.
Preferably, LDPC code word is subjected to Bit Interleave, specifically comprised the following steps：
LDPC code word is subjected to parity check bit intertexture, obtains the LDPC code word after parity check bit interweaves；
LDPC code word after interweaving to parity check bit carries out code word interception, the LDPC code word after being intercepted；
The ranks that traveling is listed are carried out to the LDPC code word after interception to interweave, and obtain the LDPC code word after ranks interweave；
LDPC code word after interweaving to ranks carries out bit permutation, obtains the LDPC code word after Bit Interleave；
Wherein, bit permutation pattern is corresponding with the LDPC code of specific code check and specific constellation mapping method.
Preferably, in interception a length of 69120 bit of former code, code check is the LDPC code word after the parity check bit interweaves 1/4 or 1/2；The code check of LDPC code word includes 1/4,1/3,2/5,1/2,3/5,2/3,3/4 and 6/7 after interception, wherein after interception The LDPC code word that code check is 1/4 and 1/2 does not intercept any bit during interception, and code check is 1/3,2/5,3/ after intercepting 5,2/3,3/4 and 6/7 LDPC code word includes two kinds of interception ways, respectively standard code words and mutual-complementing code during interception Word；Constellation mapping method includes 8PSK, 16APSK and 32APSK.
Preferably, when the constellation mapping method uses 8PSK, bit permutation pattern corresponding with code check after each interception For：
Preferably, when the constellation mapping method uses 16APSK, bit permutation mould corresponding with code check after each interception Formula is：
Preferably, when the constellation mapping method uses 32APSK, bit permutation mould corresponding with code check after each interception Formula is：
According to another aspect of the present invention, a kind of deinterleaving decoding demodulation method is provided, is included the following steps：
Demapping processing is carried out according to corresponding planisphere to symbol stream, obtains bit data；
Bit data is first subjected to solution bit permutation according to corresponding bit permutation pattern, then carries out solution ranks and interweaves, and The position zero padding of LDPC code word interception after interweaving to solution ranks, then carry out solution even-odd check and interweave, the ratio after being deinterleaved Special data flow；
LDPC decoding processing is carried out to the bit data flow after deinterleaving, obtains decoded bitstream data.
Compared with prior art, technical solution of the present invention has the following advantages：
1, the present invention is directed to the LDPC code and particular constellation mapping method of specific code check, is selected in bit interleaving process Corresponding bit permutation pattern so that system performance is preferably promoted.
2, the selection that the present invention passes through different bit permutation patterns so that system obtains preferable property in combined debugging Can, and it is relatively simple during realization, it is suitable for different application scenarios and application demand.
Description of the drawings
Upon reading the detailed description of non-limiting embodiments with reference to the following drawings, other feature of the invention, Objects and advantages will become more apparent upon：
Fig. 1 is the specific implementation mode flow diagram of Bit Interleaved Coded Modulation method in the present invention；
Fig. 2 is the specific implementation mode flow diagram of Bit Interleave method in the present invention；
Fig. 3 is the read/write operation schematic diagram that ranks interweave in the present invention；
Fig. 4 is the flow diagram of bit permutation in the present invention；
Fig. 5 is the specific implementation mode flow diagram that decoding demodulation method is deinterleaved in the present invention.
Specific implementation mode
It elaborates below to the embodiment of the present invention：The present embodiment under based on the technical solution of the present invention into Row is implemented, and detailed embodiment and specific operating process are given.It should be pointed out that the ordinary skill of this field For personnel, without departing from the inventive concept of the premise, various modifications and improvements can be made, these belong to this hair Bright protection domain.
Embodiment 1
A kind of Bit Interleaved Coded Modulation method for communication system is present embodiments provided, is included the following steps：
LDPC codings will be first carried out for the code word of communication, obtains LDPC code word；
LDPC code word is subjected to Bit Interleave again, obtains the LDPC code word after Bit Interleave；
Constellation mapping is carried out according to corresponding planisphere to the LDPC code word after the Bit Interleave, obtains symbol stream.
Further, the method for the Bit Interleave, includes the following steps：LDPC code word is subjected to parity check bit friendship It knits, obtains the LDPC code word after parity check bit interweaves；LDPC code words after interweaving to the parity check bit carry out code word and cut It takes, the LDPC code word after being intercepted；The ranks that traveling is listed are carried out to the LDPC code word after interception to interweave, and obtain ranks friendship LDPC code word after knitting；After LDPC code word after interweaving to the ranks carries out bit permutation to obtain Bit Interleave LDPC code word, wherein the pattern of the bit permutation is opposite with the LDPC code of specific code check and specific constellation mapping method It answers.
Embodiment 2
Present embodiments provide a kind of deinterleaving decoding demodulation method for communication system corresponding with embodiment 1, packet Include following steps：
Demapping processing is carried out to obtain bit data according to corresponding planisphere to symbol stream；
The bit data is subjected to solution bit permutation according to corresponding bit permutation pattern, then carries out solution ranks and interweaves, And to solution ranks interweave after LDPC code word interception position zero padding, then carry out solution even-odd check interweave to obtain deinterleaving after Bit data flow；
LDPC decoding processing is carried out to obtain decoded bitstream data to the bit data flow after the deinterleaving.
It is understandable to enable objects, features and advantages of the present invention to become apparent, below in conjunction with the accompanying drawings to the upper of the present invention Two embodiments are stated to be further described.
Embodiment 1 provide a kind of communication system Bit Interleaved Coded Modulation method, for specific code check LDPC codes with Specific constellation mapping method selects corresponding bit permutation pattern, and the promotion of system performance is obtained in combined debugging.
Embodiment 1 is further described with reference to specific example.
On the basis of the technical solution of embodiment 1, transmitting terminal is：First by the bit stream after message sink coding, Bose-Chaudhuri-Hocquenghem Code The coding for being input to the LDPC code word that LDPC encoder carries out specific code check code length obtains female code, wherein female code is for code length 69120 1/4 standard code or 1/2 standard code of code length 69120；Input bit interleaver later carries out parity check bit friendship Knit, code word interception, ranks interweave and bit permutation, wherein for code check after interception be less than 1/2 code word, be by code check It is obtained by corresponding interception for 1/4 standard code, the LDPC code code check after interception is respectively 1/3 and 2/5, has the interception to be Two kinds of interception ways of standard code words and complementary code word, corresponding interception code table are shown in annex I, for code check after interception higher than 1/2 Code word is by being obtained by corresponding interception for 1/2 standard code to code check, and the LDPC code code check after interception is respectively 3/5,2/3,3/4 and 6/7, it is two kinds of interception ways of standard code words and complementary code word to have interception, and corresponding interception code table is shown in attached Record II；Bit Interleave treated data are then subjected to constellation mapping, are emitted later, channel is undergone.For different Code check and constellation mapping method, selected bit permutation method are shown in annex IV.
The flow chart of the embodiment of the Bit Interleaved Coded Modulation method of embodiment 1 as shown in Fig. 1, shown in Fig. 2 Be embodiment 1 Bit Interleave method embodiment flow chart.
One, the Bit Interleaved Coded Modulation process of code word of the final code check less than 1/2 includes the following steps：
Step S1：By the bit stream after message sink coding, Bose-Chaudhuri-Hocquenghem Code, is encoded by certain LDPC and obtain code check For 1/4 standard code words (i0, i1... i17279, p0, p1... p51839), wherein (i0, i1... i17279) representative information position, (p0, p1... p51839) represent check bit.
Step S2：It is less than 1/2 code word for final code check, interweaves without parity check bit.
Step S3：Intercept code word, obtain 1/4 rate codewords without interception and the 1/3 code check standard code words through interception, 1/3 code check complementation code word, 2/5 code check standard code words, 2/5 code check complementation code word.Corresponding interception code table is shown in annex I.
Step S4：Advance the ranks intertexture listed, and ranks weaving diagram is as shown in figure 3, U=(u0, u1... ul-1) represent the input code word that ranks interweave, V=(v0, v1... vl-1) output codons that ranks interweave are represented, wherein l is interception Code word size afterwards.Each column is divided into two parts, hereinafter referred to as part one and part two, two parts in ranks interleaving process By intertexture columns NcBit number Q=360 with each piece determines that two-part line number uses N respectivelyr1And Nr2To indicate.l、Nr1、 Nr2And NcSee annex III.Ranks interleaving process is：For 0≤i ＜ Nc×Nr1Input uiIt is written into r in part oneiRow ciRow Position：
ri=(i mod Nr1)
For Nc×Nr1The input u of≤i ＜ liThe r being written into part twoiRow ciThe position of row：
The output bit v of 0≤j ＜ ljFrom rjRow cjIt reads, has in row：
cj=(j mod Nc)。
Step S5：Bit permutation is carried out, bit permutation flow diagram is as shown in Figure 4.The bit that ranks are interweaved Flow V=(v0, v1... vl-1) input by demultplexer is assigned as NsA sub- bit stream, is answered after displacement, then by multichannel With device output bit flow W=(w0, w1..., wl-1), wherein NsWith aforementioned NcIt is equal, can be by bit permutation procedural representation：
Wherein, s numbers for sub- bit stream, esTo replace sub- bit flow table, corresponding displacement patterns are shown in annex IV.
Step S6：To code word W after bit permutation=(w0, w1..., wl-1) according to corresponding planisphere carry out constellation mapping, Obtain symbol stream.
Two, the Bit Interleaved Coded Modulation process of code word of the final code check more than or equal to 1/2 includes the following steps：
Step s1：Bit stream after message sink coding, Bose-Chaudhuri-Hocquenghem Code is encoded by certain LDPC, and it is 1/2 to obtain code check Standard code words (i0, i1... i34559, p0, p1... p34559), (i0, i1... i34559) representative information position, (p0, p1... p34559) Represent check bit.
Step s2：Parity check bit intertexture is carried out to code word
p360*t+s=p96*s_t, 0≤s ＜ 360,0≤t ＜ 96
Obtain the code word after final parity check bit interweaves.
Step s3：Intercept code word, obtain 1/2 rate codewords without interception and the 3/5 code check standard code words through interception, 3/5 code check complementation code word, 2/3 code check standard code words, 2/3 code check complementation code word, 3/4 code check standard code words, 3/4 code check are complementary Code word, 6/7 code check standard code words or 6/7 code check complementation code word.Corresponding interception code table is shown in annex II.
Step s4：Advance the ranks intertexture listed, and ranks weaving diagram is as shown in figure 3, U=(u0, u1... ul-1) represent the input code word that ranks interweave, V=(v0, v1... vl-1) output codons that ranks interweave are represented, wherein l is interception Code word size afterwards.Each column is divided into two parts, hereinafter referred to as part one and part two during ranks interweave, and two parts have friendship Knit columns NcBit number Q=360 with each piece determines that two-part line number uses N respectivelyr1And Nr2To indicate.l、Nr1、Nr2With NcSee annex III.Ranks interleaving process is：For 0≤i ＜ Nc×Nr1Input uiIt is written into r in part oneiRow ciThe position of row It sets：
ri=(i mod Nr1)
For Nc×Nr1The input u of≤i ＜ liThe r being written into part twoiRow ciThe position of row：
The output bit v of 0≤j ＜ ljFrom rjRow cjIt reads, has in row：
cj=(j mod Nc)。
Step s5：Bit permutation is carried out, bit permutation flow diagram is as shown in Figure 4.The bit that ranks are interweaved Flow V=(v0, v1..., vl-1) input by demultplexer is assigned as NsA sub- bit stream, is answered after displacement, then by multichannel With device output bit flow W=(w0, w1..., wl-1), wherein NsWith aforementioned NcIt is equal, can be by bit permutation procedural representation：
Wherein, s numbers for sub- bit stream, esTo replace sub- bit flow table, corresponding displacement patterns are shown in annex IV.
Step s6：To code word W after bit permutation=(w0, w1..., wl-1) according to corresponding planisphere carry out constellation mapping, Obtain symbol stream.
Embodiment 2 provides a kind of corresponding deinterleaving decoding demodulation method.It is the deinterleaving of embodiment 2 as shown in Figure 5 Decode the flow diagram of the specific implementation mode of demodulation method.With reference to figure 5, it includes following step to deinterleave decoding demodulation method Suddenly：
Step a1：Demapping processing is carried out to obtain bit data according to corresponding planisphere to symbol stream；
Step a2：The bit data is subjected to solution bit permutation according to corresponding bit permutation pattern, then carries out solution row Column interleaving, and to the position zero padding of code word interception, then carry out solution even-odd check and interweave with the bit data after being deinterleaved Stream；
Step a3：LDPC decoding processing is carried out to obtain decoded bitstream data to the bit data flow.
Annex I：Intercept each interception code check that code check is greater than or equal to 1/2
Original code word after female code is encoded is (i0, i1... i17279, p0, p1... p51839), by information bit and check bit Bit carries out piecemeal as unit of 360 bits, then obtains 48 block message position blocks and 144 bit check position blocks, is expressed as (I0, I1... I47, P0, P1... P143)
When interception is 1/3 code check standard code words, reservation bit code block is：
m1∈ [0,47] and m1mod 4≠0；m2∈ [5,19]；m3∈ [20,143] and m3 mod 4≠0
When interception is 1/3 code check complementation code word, reservation bit code block is：
m1∈ [0,47] and m1mod 4≠2；m2∈ [5,19]；m3∈ [20,143] and m3 mod4≠1
When interception is 2/5 code check standard code words, reservation bit code block is：
m1∈ [0,47] and m1mod 4≠0；m2∈ [5,33]；m3∈ [34,143] and m3 mod 2≠0
When interception is 2/5 code check complementation code word, reservation bit code block is：
m1∈ [0,47] and m1mod 4≠2；m2∈ [5,33]；, m3∈ [34,143] and m3 mod 2≠1
Annex II：Intercept each interception code check that code check is less than 1/2
Original code word after female code is encoded is (i0, i1... i34559, p0, p1... p34559), by information bit and check bit Bit carries out piecemeal as unit of 360 bits, then obtains 96 block message position blocks and 96 bit check position blocks, is expressed as (I0, I1... I95, P0, P1... P95)
When interception is 3/5 code check standard code words, reservation bit code block is：
m1=0,1 ... 95；m2∈ [0,95] and m2 mod 3≠2
When interception is 3/5 code check complementation code word, reservation bit code block is：
m1=0,1 ... 95；m2∈ [0,95] and m2 mod3≠0
When interception is 2/3 code check standard code words, reservation bit code block is：
m1=0,1 ... 95；m2∈ [0,95] and m2Mod 2=1
When interception is 2/3 code check complementation code word, reservation bit code block is：
m1=0,1 ... 95；m2∈ [0,95] and m2Mod 2=0
When interception is 3/4 code check standard code words, reservation bit code block is：
m1=0,1 ... 95；m2∈ [0,95] and m2Mod3=0
When interception is 3/4 code check complementation code word, reservation bit code block is：
m1=0,1 ... 95；m2∈ [0,95] and m2Mod 3=2
When interception is 6/7 code check standard code words, reservation bit code block is：
m1=0,1 ... 95；m2∈ [0,95] and m2Mod 6=3
When interception is 6/7 code check complementation code word, reservation bit code block is：
m1=0,1 ... 95；m2∈ [0,95] and m2Mod6=2
Annex III：Ranks interleave parameter table
Annex IV：Bit permutation pattern table
Specific embodiments of the present invention are described above.It is to be appreciated that the invention is not limited in above-mentioned Particular implementation, those skilled in the art can make various deformations or amendments within the scope of the claims, this not shadow Ring the substantive content of the present invention.

Claims (7)

1. a kind of Bit Interleaved Coded Modulation method, which is characterized in that include the following steps：
First LDPC codings will be carried out for the code word of communication, obtains LDPC code word；
LDPC code word is subjected to Bit Interleave again, obtains the LDPC code word after Bit Interleave；
Constellation mapping is carried out according to corresponding planisphere to the LDPC code word after Bit Interleave, obtains symbol stream.
2. Bit Interleaved Coded Modulation method according to claim 1, which is characterized in that LDPC code word is carried out bit friendship It knits, specifically comprises the following steps：
LDPC code word is subjected to parity check bit intertexture, obtains the LDPC code word after parity check bit interweaves；
LDPC code word after interweaving to parity check bit carries out code word interception, the LDPC code word after being intercepted；
The ranks that traveling is listed are carried out to the LDPC code word after interception to interweave, and obtain the LDPC code word after ranks interweave；
LDPC code word after interweaving to ranks carries out bit permutation, obtains the LDPC code word after Bit Interleave；
Wherein, bit permutation pattern is corresponding with the LDPC code of specific code check and specific constellation mapping method.
3. Bit Interleaved Coded Modulation method according to claim 2, which is characterized in that after the parity check bit interweaves LDPC code word interception a length of 69120 bit of former code, code check be 1/4 or 1/2；After interception the code check of LDPC code word include 1/4, 1/3,2/5,1/2,3/5,2/3,3/4 and 6/7, wherein the LDPC code word that code check is 1/4 and 1/2 after interception is intercepting in the process not Any bit is intercepted, and the LDPC code word that code check is 1/3,2/5,3/5,2/3,3/4 and 6/7 after intercepting includes during interception Two kinds of interception ways, respectively standard code words and complementary code word；Constellation mapping method includes 8PSK, 16APSK and 32APSK.
4. Bit Interleaved Coded Modulation method according to claim 3, which is characterized in that the constellation mapping method uses When 8PSK, bit permutation pattern corresponding with code check after each interception is：
5. Bit Interleaved Coded Modulation method according to claim 3, which is characterized in that the constellation mapping method uses When 16APSK, bit permutation pattern corresponding with code check after each interception is：
6. Bit Interleaved Coded Modulation method according to claim 3, which is characterized in that the constellation mapping method uses When 32APSK, bit permutation pattern corresponding with code check after each interception is：
7. a kind of deinterleaving decodes demodulation method, which is characterized in that include the following steps：
Demapping processing is carried out according to corresponding planisphere to symbol stream, obtains bit data；
Bit data is subjected to solution bit permutation according to corresponding bit permutation pattern, then carries out solution ranks and interweaves, and is gone to solution The position zero padding of LDPC code word interception after column interleaving, then carry out solution even-odd check and interweave, the bit data after being deinterleaved Stream；
LDPC decoding processing is carried out to the bit data flow after deinterleaving, obtains decoded bitstream data.
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