CN104980251B - Code modulating method and decoding demodulation method - Google Patents
Code modulating method and decoding demodulation method Download PDFInfo
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Abstract
The invention discloses a kind of code modulating methods and decoding demodulation method, wherein code modulating method to include：Information bit is encoded to obtain the code word of the first code length；Use different processing and the Bit Interleaves of punchinging to obtain the code word of the second code length the code word of first code length based on different constellation mapping patterns；Constellation mapping is carried out to obtain symbol stream to the code word of second code length.The technical program can effectively improve the flexibility of bit interleaving design, reduce the threshold level of system, and improve system performance.
Description
Technical field
The present invention relates to coding digital information transmission field, more particularly to a kind of code modulating method and decoding demodulation side
Method.
Background technology
Low density parity check code (Low-density Parity-check, i.e. LDPC code) is defined by check matrix
A kind of liner code, to keep decoding feasible, needed when code length is longer check matrix meet " sparsity ", i.e., 1 in check matrix
Density it is relatively low（1 number is much smaller than 0 number i.e. in check matrix）, and code length is longer, and density is lower.LDPC code
It has a wide range of applications in the communications field, for example, in DTMB, DVB-S2, CMMB, DVB-T2, DVB-NGH and IEEE802.11n-
It is used in 2009 systems.
Transmitting terminal can also be mapped to bit sequence suitable for symbol sebolic addressing using constellation mapping, in order to support the number of high-speed
According to transmission.Usual transmitting terminal meeting high-order constellation map pattern, such as quadrature amplitude modulation（Quadrature Amplitude
Modulation, QAM）Constellation mapping（Abbreviation qam constellation maps）.QAM is a kind of combined modulation of amplitude and phase, also will
The amplitude and phase of modulated signal change with the variation of digital baseband signal.Using M（M>2）The QAM of system can be denoted as
MQAM（Such as 16QAM, 64QAM etc.）, M is bigger, and band efficiency is higher.And in DVB-T2 and DVB-NGH systems, in star
Bit Interleave processing is also provided with before seat mapping, to reduce the threshold level of system.
In recent years, it has also appeared after carrying out LDPC codings to information bit, after being encoded by the way of processing of punchinging
The removal of a part of bit, the bit of removal will be no longer participate in subsequent Bit Interleave and symbol mapping processing, will not transmit
To receiving terminal.Certainly, punching processing premise be removal partial bit have no effect on information transmission.But the prior art is used
Processing of punchinging be unfavorable for the flexibility of bit interleaving design, system performance is promoted limited.
Invention content
Problems solved by the invention is to improve existing treatment technology of punchinging, to improve the flexibility of bit interleaving design,
To reduce the threshold level of system, and improve system performance.
To solve the above problems, an embodiment of the present invention provides a kind of code modulating method, include the following steps：To information
Bit is encoded to obtain the code word of the first code length；The code word of first code length is used based on different constellation mapping patterns
Different processing and the Bit Interleaves of punchinging are to obtain the code word of the second code length；To the code word of second code length carry out constellation mapping with
Obtain symbol stream.
Optionally, described that different processing of punchinging is used to the code word of first code length based on different constellation mapping patterns
Include with the code word for obtaining the second code length with Bit Interleave：The code word of first code length is determined according to different constellation mapping patterns
In position where bit to be deleted and Bit Interleave mode；Delete in the code word of first code length it is all in this position
Bit to be deleted, and the code word for carrying out Bit Interleave according to the Bit Interleave mode to obtain the second code length.
Optionally, the bit to be deleted is information bit or check bit.
Optionally, for same code rate and the first code length but the different information bit of constellation mapping pattern, pass through place of punchinging
The bit number for managing removal is identical.
Optionally, the second code a length of 64800.
Optionally, the constellation mapping pattern includes regular constellation mapping pattern and irregular constellation mapping pattern.
Optionally, planisphere used by the constellation mapping pattern includes 4-QAM, 16-QAM, 64-QAM, 256-QAM
And any one of 1024-QAM planispheres.
The embodiment of the present invention additionally provides a kind of decoding demodulation method, includes the following steps：Receive symbol stream, the wherein symbol
Number stream is obtained after being handled information bit by above-mentioned code modulating method；According to the constellation mapping pattern of transmitting terminal to this
Symbol stream carries out demapping to obtain log-likelihood ratio stream；The log-likelihood ratio stream is carried out based on different constellation mapping patterns
Zero padding processing reconciliation interleaving treatment is with the log-likelihood ratio stream after being deinterleaved；Log-likelihood ratio after the deinterleaving is flowed into
Row decoding is to obtain information bit.
Optionally, described that zero padding processing and deinterleaving are carried out to the log-likelihood ratio stream based on different constellation mapping patterns
It handles with the log-likelihood ratio stream after being deinterleaved and includes：First yard of transmitting terminal pair is determined according to different constellation mapping patterns
Long code word, which punching, the location of bit deleted in processing procedure and deinterleaves mode；In the bit of all deletions
Zero padding on location, and processing is deinterleaved with the log-likelihood ratio after being deinterleaved according to the deinterleaving mode
Stream.
Compared with prior art, technical solution of the present invention has the advantages that：
The code modulating method provided according to embodiments of the present invention, to the code word after coding punching processing when, base
Different punching processing and Bit Interleave mode are used in different constellation mapping patterns, is set to effectively improve Bit Interleave
The flexibility of meter.
The decoding demodulation method provided according to embodiments of the present invention receives in this way since transmitting terminal have passed through processing of punchinging
It terminates the symbol stream received to reduce, further, the symbol stream received is solved using the constellation mapping pattern of transmitting terminal
Log-likelihood ratio stream is obtained after mapping, and zero padding processing reconciliation is carried out to the log-likelihood ratio stream based on different constellation mapping patterns
Then interleaving treatment flows into row decoding to demodulate information bit to the log-likelihood ratio after deinterleaving again.It can reduce in this way
The threshold level of system, and improve system performance.
Description of the drawings
Fig. 1 is a kind of flow diagram of the specific implementation mode of code modulating method of the present invention；
Fig. 2 is a kind of flow diagram of the specific implementation mode of decoding demodulation method of the present invention.
Specific implementation mode
Inventor has found the flexibility for handling and being unfavorable for bit interleaving design of punchinging used by the prior art, systematicness
It can be promoted limited.
In view of the above-mentioned problems, inventor provides a kind of code modulating method and decoding demodulation method, is sending out by research
Penetrate end to the code word after coding punching processing when, different processing of punchinging is used based on different constellation mapping patterns, from
And effectively improve the flexibility of bit interleaving design；And receiving terminal based on different constellation mapping patterns to demapping after
Log-likelihood ratio carries out zero padding processing, is then deinterleaved and decodes again to demodulate information bit, can reduce in this way and is
The threshold level of system, and improve system performance.
To make the above purposes, features and advantages of the invention more obvious and understandable, below in conjunction with the accompanying drawings to the present invention
Specific implementation mode be described in detail.
As shown in Fig. 1 the flow diagram of the specific implementation mode of a kind of code modulating method of the present invention.With reference to
Fig. 1, the code modulating method include the following steps：
Step S11：Information bit is encoded to obtain the code word of the first code length；
Step S12：Based on different constellation mapping patterns to the code word of first code length using it is different punching processing and
Bit Interleave is to obtain the code word of the second code length；
Step S13：Constellation mapping is carried out to obtain symbol stream to the code word of second code length.
In the present embodiment, for communication system, what it is in transmitting terminal input is information bit, such as can be transmitting
The digital information bits that the analog signals such as voice, the image received are obtained by digitlization and message sink coding are terminated, can also be
Digital information bits etc. of the transmitting terminal received from digital devices such as computers.
As described in step S11, information bit is encoded.Transmitting terminal will be according to preset code check（Such as 1/3,
2/3 etc.）, code length（It is first code length in the present embodiment）Information bit is encoded, the mode of coding may be used
LDPC code word is encoded.In other embodiment, information bit can also be encoded using other existing coding modes,
Such as outer code（BCH code）LDPC code etc. is cascaded, it is numerous to list herein.
Specifically, the check bit of each block message bit is calculated, and by information bit and the check bit being calculated
It is stitched together, to obtain the code word of the first code length.Can be that information bit exists in preceding, check bit in splicing
Afterwards；Can also be check bit in preceding, information bit rear.
For example, setting the n-th block message bit as [bn,0,bn,1,…,bn,K-1], the check bit being calculated is [pn,0,
pn,1,…,pn,N-K-1], wherein K is the number of specified code check and the information bit under code length, and N is the code under specified code length and code check
Word length.It is N that information bit and check bit, which are finally combined into a length,（I.e. described first code length）Code word [b 'n,0,
b′n,1,…,b′n,N-1],
As described in step S12, punchinged using different to the code word of first code length based on different constellation mapping patterns
Processing and Bit Interleave are to obtain the code word of the second code length.
Unlike the prior art, in the present embodiment, punching processing and bit friendship are carried out to the code word of first code length
When knitting, it is contemplated that this factor of constellation mapping pattern used by follow-up mapping processing, in identical coding mode（It is i.e. identical
Code check and code length）Under, use different processing modes of punchinging for different constellation mapping patterns.
The constellation mapping pattern includes regular constellation mapping pattern or irregular constellation mapping pattern.Wherein, described non-
Regular constellation mapping mode refers to completing bit data to constellation using a kind of planisphere and more than one constellation point mapping modes
The mapping process of symbol.The irregular constellation mapping mode may be used QAM constellation and be mapped, and can also use APSK
Planisphere is mapped.Shaping can be reduced using irregular constellation mapping to lose, principle is so that low energy in planisphere
The number of constellation points of amount is more and the number of constellation points of high-energy is few, so that output signal is closer in the case where equiprobability maps
Gaussian Profile.
Specifically, this step includes：
Step S121：It is determined according to different constellation mapping patterns in the code word of first code length where bit to be deleted
Position and Bit Interleave mode；
Step S122：It deletes in all bits to be deleted in this position in the code word of first code length, and according to this
Bit Interleave mode carries out Bit Interleave to obtain the code word of the second code length.
In the present embodiment, for identical code check and code length, but the code word of the first different code length of constellation mapping pattern
Punching processing when, the bit number dug is identical, but is specifically then not quite similar by the corresponding serial number of bit that chisel is gone.
In practice, the different argument sequences punchinged with Bit Interleave can be set, to right（Subsequently mould is mapped using various constellations
Formula）The code word of first code length carries out different processing and the Bit Interleaves of punchinging to obtain the code word of the second code length.
For example, the code word of the second code length set is [b "n,0,b″n,1,…,b″n,N-P-1], wherein P is in identical code length
And code check, but the bit number of removal is punctured under various constellations mapped mode.Sequence can be used with the parameter of Bit Interleave by punchinging
[k0,k1,…,kN-P-1] indicate, i.e., forWherein, [k0,k1,…,
kN-P-1] all it is integer in [0, N-1] range, and it is different two-by-two.Obviously, set K={ k0,k1,…,kN-P-1Be set I=0,
1 ..., N-1 } subset, the supplementary set for defining K is Including P element be exactly the bit dug serial number.
That is, for identical code check and code length（I.e. N is identical）, but the first different code length of constellation mapping pattern
Code word punching processing when, P is identical, but set K can difference, that is, identical coding mode is in different constellation mapping moulds
The position of the lower bit dug of formula can be different, and the parameter of the Bit Interleave used certainly is also different.
As described in step S13, constellation mapping is carried out to obtain symbol stream to the code word of second code length.
Specifically, according to different constellation mapping patterns, the code word of second code length is divided into multiple bit groups, and will be every
One bit group is mapped as a symbol, to obtain symbol stream.For example, for the constellation mapping mould using 4-QAM planispheres
Formula is grouped to obtain multiple bit groups according to 2 one group of bits, then these bit groups is respectively mapped to a plural number symbol
Number, to obtain symbol stream.
And for the constellation mapping pattern using planispheres such as 16-QAM, 64-QAM, 256-QAM and 1024-QAM, then
Correspondingly it is grouped to obtain multiple bit groups according to 4,6,8 and 10 one group of bits, then by these bit components
It is not mapped to a complex symbol, to obtain symbol stream.
The embodiment of the present invention additionally provides a kind of decoding demodulation method.As shown in Fig. 2 a kind of decoding solution of the invention
The flow diagram of the specific implementation mode of tune method.With reference to figure 2, the decoding demodulation method includes the following steps：
Step S21：Symbol stream is received, the wherein symbol stream is handled information bit by above-mentioned code modulating method
After obtain；
Step S22：Demapping is carried out to obtain log-likelihood ratio to the symbol stream according to the constellation mapping pattern of transmitting terminal
Stream；
Step S23：The log-likelihood ratio stream is carried out at zero padding processing and deinterleaving based on different constellation mapping patterns
Reason is with the log-likelihood ratio stream after being deinterleaved；
Step S24：Row decoding is flowed into obtain information bit to the log-likelihood ratio after the deinterleaving.
In the present embodiment, the prior art may be used to realize in the step S21 and step S22.It should be noted that
Receiving terminal can pass through signaling（It is carried when sending information by transmitting terminal）Or other modes obtain code length, code check and constellation mapping
The information such as pattern.
As described in the step S23, zero padding processing is carried out to the log-likelihood ratio stream based on different constellation mapping patterns
Reconciliation interleaving treatment is with the log-likelihood ratio stream after being deinterleaved.
Specifically, this step includes：
Step S231：Determine that the code word of the first code length of transmitting terminal pair carries out processing of punchinging according to different constellation mapping patterns
The location of bit deleted in the process and deinterleaving mode；
Step S232：The zero padding on the bit location of all deletions, and carry out solution friendship according to the deinterleaving mode
Processing is knitted with the log-likelihood ratio stream after being deinterleaved.
Correspond to the n-th block codewords [b " in symbol stream for example, settingn,0,b″n,1,…,b″n,N-P-1] log-likelihood ratio
（Loglikelihood Ratio, LLR）For [ln,0,ln,1,…,ln,N-P-1].According to different constellation mapping patterns, all
Zero padding on the bit location of deletion, and obtain [l ' after being deinterleaved processing according to corresponding deinterleaving moden,0,
l′n,1,…,l′n,N-1], wherein
Then, as described in step S24, row decoding is flowed into obtain information bit to the log-likelihood ratio after deinterleaving.
, can be according to information such as code length and code checks in practice, and pass through [l 'n,0,l′n,1,…,l′n,N-1] information bit is calculated.This
In embodiment, the specific algorithm of decoding is not limited, receiving terminal can be right according to the institute of coding method used by transmitting terminal
The decoded mode answered is handled into row decoding.
An example is set forth below and further describes technical scheme of the present invention.
Example 1：
In this example, system is by transmitting terminal and receiving terminal, and as shown in table 1, transmitting terminal and receiving terminal include 4 kinds of patterns.
Table 1：4 kinds of patterns of example 1
| Code check | Code length after punchinging | Constellation mapping pattern | |
| Pattern 1 | 1/3 | 64800 | 4-QAM |
| Pattern 2 | 1/3 | 64800 | 16-QAM |
| Pattern 3 | 2/3 | 64800 | 4-QAM |
| Pattern 4 | 2/3 | 64800 | 16-QAM |
In this example, since the processing procedure of receiving terminal is the inverse process of transmitting terminal, detailed description is sent out here
The processing procedure at end is penetrated, the specific implementation process of receiving terminal repeats no more.
In transmitting terminal, LDPC encoder is under pattern 1 and pattern 2, all according to check matrix H1, pass through 21600 information
48960 bit check bits are calculated in bit, then splice to obtain in such a way that information bit is posterior in preceding, check bit
The code word of 70560 bits, i.e. N=70560, K=21600.
LDPC encoder is under pattern 3 and pattern 4, all according to check matrix H2, calculated by 43200 information bits
To 23040 bit check bits, then splice to obtain the code of 66240 bits in such a way that information bit is posterior in preceding, check bit
Word, i.e. N=66240, K=43200.
The present embodiment is to H1With H2Detail be not described.
For pattern 1 and pattern 3, [the k that punchinges with Bit interleaving block0,k1,…,k64799] can pass through it is following public
Formula obtains：
Wherein, t is the integer in [0,360] range, and m is the integer in [0,89] range.
For pattern 2 and pattern 4, [the k that punchinges with Bit interleaving block0,k1,…,k64799] can pass through it is following public
Formula obtains：
Wherein, t is the integer in [0,360] range, and m is the integer in [0,44] range.
It punchinges and Bit Interleave parameter [π0,π1,…,π179] definition it is as shown in table 2.
Table 2：It punchinges in example 1 and Bit Interleave parameter
| [π0,π1,…,π179] | |
| Pattern 1 | [16,18,20,…,194,17,19,…,195] |
| Pattern 2 | [0,1,2,3,20,21,22,…,195] |
| Pattern 3 | [4,6,8,…,182,5,7,…,183] |
| Pattern 4 | [0,1,2,3,8,9,10,…,183] |
For pattern 1 and pattern 3, constellation point module will be by punchinging with the code word of Bit Interleave by two bits one
Group grouping, then by table 3 by it is each include that the bit groups of two bits is mapped to a complex symbol.
Table 3：4-QAM mapping modes in example 1
| Bit group | Symbol |
| 00 | 1+1i |
| 01 | 1-1i |
| 10 | -1+1i |
| 11 | -1-1i |
For pattern 2 and pattern 4, constellation point module will be by punchinging with the code word of Bit Interleave by four bits one
Group grouping, then by table 4 by it is each include that the bit groups of four bits is mapped to a complex symbol.
Table 4：16-QAM mapping modes in example 1
| Bit group | Symbol | Bit group | Symbol |
| 0000 | 3+3i | 1000 | -3+3i |
| 0001 | 3+1i | 1001 | -3+1i |
| 0010 | 1+3i | 1010 | -1+3i |
| 0011 | 1+1i | 1011 | -1+1i |
| 0100 | 3-3i | 1100 | -3-3i |
| 0101 | 3-1i | 1101 | -3-1i |
| 0110 | 1-3i | 1110 | -1-3i |
| 0111 | 1-1i | 1111 | -1-1i |
In receiving terminal, determine which kind of pattern is the symbol stream correspond to according to the signaling received first, then according to the mould
The information such as corresponding code length, code check and constellation mapping pattern demodulate symbol stream according to the decoding described in above-described embodiment under formula
Method carries out corresponding processing to obtain information bit, is not described in detail herein.
In conclusion the flexibility of bit interleaving design can be effectively improved using the technical program, system is reduced
Threshold level, and improve system performance.
Although the invention has been described by way of example and in terms of the preferred embodiments, but it is not for limiting the present invention, any this field
Technical staff without departing from the spirit and scope of the present invention, may be by the methods and technical content of the disclosure above to this hair
Bright technical solution makes possible variation and modification, therefore, every content without departing from technical solution of the present invention, and according to the present invention
Technical spirit to any simple modifications, equivalents, and modifications made by above example, belong to technical solution of the present invention
Protection domain.
Claims (7)
1. a kind of code modulating method, which is characterized in that include the following steps：
Information bit is encoded to obtain the code word of the first code length；
Based on different constellation mapping patterns to the code word of first code length use it is different punching processing and Bit Interleave with
To the code word of the second code length, including：Bit to be deleted in the code word of first code length is determined according to different constellation mapping patterns
The position at place and Bit Interleave mode；And it deletes in the code word of first code length in all ratios to be deleted in this position
Spy, and the code word for carrying out Bit Interleave according to the Bit Interleave mode to obtain the second code length, wherein for identical code check and
Code length, the code word of the first different code length of constellation mapping pattern punching processing when, the bit number dug is identical, and by
The corresponding serial number of bit gone is dug then to be not quite similar；
Constellation mapping is carried out to obtain symbol stream to the code word of second code length.
2. code modulating method as described in claim 1, which is characterized in that the bit to be deleted is information bit or verification
Bit.
3. code modulating method as described in claim 1, which is characterized in that same code rate and the first code length but constellation are reflected
The different information bit of emission mode, the bit number by processing removal of punchinging are identical.
4. code modulating method as described in claim 1, which is characterized in that the second code a length of 64800.
5. code modulating method as described in claim 1, which is characterized in that the constellation mapping pattern includes that regular constellation reflects
Emission mode and irregular constellation mapping pattern.
6. code modulating method as described in claim 1, which is characterized in that planisphere used by the constellation mapping pattern
Including any one of 4-QAM, 16-QAM, 64-QAM, 256-QAM and 1024-QAM planisphere.
7. a kind of decoding demodulation method, which is characterized in that include the following steps：
Symbol stream is received, the wherein symbol stream is handled information bit by code modulating method described in claim 1
After obtain；
Demapping is carried out to obtain log-likelihood ratio stream to the symbol stream according to the constellation mapping pattern of transmitting terminal；
Zero padding processing reconciliation interleaving treatment is carried out based on different constellation mapping patterns to the log-likelihood ratio stream to hand over to obtain solution
Log-likelihood ratio stream after knitting, including：Determine that the code word of the first code length of transmitting terminal pair carries out according to different constellation mapping patterns
The location of bit deleted in processing procedure of punchinging and deinterleaving mode；And the location of the bit in all deletions
Upper zero padding, and processing is deinterleaved with the log-likelihood ratio stream after being deinterleaved according to the deinterleaving mode, wherein for
Identical code check and code length, when the code word of the first different code length of constellation mapping pattern carries out zero padding processing, the bit of institute's zero padding
Number is identical, and is then not quite similar by the corresponding serial number of the bit of zero padding；
Row decoding is flowed into obtain information bit to the log-likelihood ratio after the deinterleaving.
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| CN114615124A (en) * | 2016-05-12 | 2022-06-10 | 交互数字专利控股公司 | Modulating a set of bits into two symbols and transmitting the symbols over different communication resources |
| CN110519018B (en) | 2017-01-09 | 2022-03-01 | 上海朗帛通信技术有限公司 | Method and equipment used for UE (user equipment) and base station for channel coding |
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