CN105337691A - LDPC codeword interleaving and mapping method and LDPC codeword de-interleaving and de-mapping method - Google Patents
LDPC codeword interleaving and mapping method and LDPC codeword de-interleaving and de-mapping method Download PDFInfo
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- CN105337691A CN105337691A CN201410392660.9A CN201410392660A CN105337691A CN 105337691 A CN105337691 A CN 105337691A CN 201410392660 A CN201410392660 A CN 201410392660A CN 105337691 A CN105337691 A CN 105337691A
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Abstract
The invention discloses an LDPC codeword interleaving and mapping method and an LDPC codeword de-interleaving and de-mapping method. The method comprises the following steps: performing bit interleaving of a coded LDPC codeword according to a certain bit interleaving method and an interleaving pattern; and performing constellation mapping of the bit interleaved LDPC codeword according to a constellation diagram so as to obtain a symbolic stream. According to the technical scheme provided by the invention, specific mapping and de-mapping methods are selected for an LDPC code having a specific code rate, such that the system performance is improved better.
Description
Technical field
The present invention relates to digital television techniques field, particularly a kind of intertexture of LDPC code word and mapping method and deinterleaving de-mapping method.
Background technology
In existing broadcast communication standard, LDPC coding, Bit Interleave and constellation mapping are code modulation modes the most common.In different emission systems, LDPC coding, Bit Interleave and constellation mapping all need independent design, and combined debugging, to obtain best channel performance.Therefore, the LDPC code word how for specific code check forms constellation mapping mode targetedly, is a technical barrier of this area.
Summary of the invention
The problem that the present invention solves cannot form constellation mapping mode targetedly for the LDPC code word of specific code check in prior art.
For solving the problem, embodiments providing a kind of interlace map method of LDPC code word, comprising the steps: that the LDPC code word after by described coding carries out Bit Interleave according to certain Bit Interleave method and interlacing pattern; Constellation mapping is carried out to obtain symbol stream according to specific planisphere to the LDPC code word after described Bit Interleave.
The embodiment of the present invention additionally provides a kind of deinterleaving de-mapping method of LDPC code word, comprises the steps: to carry out soft demapping process to obtain bit soft value data to symbol stream soft value data according to corresponding planisphere; Wherein said symbol stream soft value data are the symbol stream that interlace map method that receiving terminal receives LDPC code word described above obtains; Described bit soft value data are carried out deinterleaving according to certain de-interweaving method and interlacing pattern, obtains the bit soft value data flow after deinterleaving; LDPC decoding process is carried out to obtain decoded bitstream data to described bit soft value data flow.
Compared with prior art, technical solution of the present invention has the following advantages:
LDPC code for specific code check selects corresponding constellation mapping better to be promoted to make systematic function with de-mapping method.
Accompanying drawing explanation
Fig. 1 is the schematic flow sheet of the embodiment of the interlace map method of a kind of LDPC code word of the present invention;
Fig. 2 is the schematic flow sheet of the embodiment of the deinterleaving de-mapping method of a kind of LDPC code word of the present invention;
Embodiment
Inventor finds in prior art, cannot form specific aim constellation mapping mode for the LDPC code of specific code check.
For the problems referred to above, inventor, through research, provides a kind of interlace map method and deinterleaving de-mapping method of LDPC code word, and the LDPC code for specific code check selects specific mapping and de-mapping method better to be promoted to make systematic function.
For enabling above-mentioned purpose of the present invention, feature and advantage more become apparent, and are described in detail the specific embodiment of the present invention below in conjunction with accompanying drawing.
In embodiments of the present invention, transmitter terminal is: first the bit stream after message sink coding, Bose-Chaudhuri-Hocquenghem Code is input to the coding that LDPC encoder carries out the LDPC code word of specific code check code length, input bit interleaver afterwards, interleaving treatment is carried out according to certain Bit Interleave patterning method, subsequently the data after Bit Interleave process are carried out the 16QAM constellation mapping of corresponding code check, modulate afterwards, launch, experience channel.Receiver end is: the data after channel are carried out demodulation, and the data input De-mapping module then after demodulation, carries out 16QAM demapping.Afterwards the bit soft value information that De-mapping module exports is input to de-interleaving block and carries out deinterleaving, output to ldpc decoder afterwards, the decoding based on specific LDPC code word is carried out to it, output bit flow of finally decoding.
As shown in Figure 1 be the schematic flow sheet of the embodiment of the interlace map method of a kind of LDPC code word of the present invention.With reference to figure 1, the interlace map method of LDPC code word comprises the steps:
Step S11: described LDPC code word is carried out Bit Interleave according to certain deinterleaving method and interlacing pattern, obtains the LDPC code word after interweaving;
Step S12: carry out constellation mapping to obtain symbol stream to the LDPC code word after described Bit Interleave according to corresponding planisphere, wherein, described planisphere is corresponding with the LDPC code of specific code check.
Particularly, the code length of the LDPC code word in LDPC code table is 19200 or 57600, and the planisphere being 1/5 for code check is:
Constellation point | Constellation symbol |
0 | 0.4639+0.6317i |
1 | 0.6317+0.4639i |
2 | 0.6397+0.9882i |
3 | 0.9882+0.6397i |
4 | -0.4639+0.6317i |
5 | -0.6317+0.4639i |
6 | -0.6397+0.9882i |
7 | -0.9882+0.6397i |
8 | 0.4639-0.6317i |
9 | 0.6317-0.4639i |
10 | 0.6397-0.9882i |
11 | 0.9882-0.6397i |
12 | -0.4639-0.6317i |
13 | -0.6317-0.4639i |
14 | -0.6397-0.9882i |
15 | -0.9882-0.6397i |
Code check be 1/4 planisphere corresponding to LDPC code be:
Constellation point | Constellation symbol |
0 | 0.3793+0.5685i |
1 | 0.5685+0.3793i |
2 | 0.5940+1.0863i |
3 | 1.0863+0.5940i |
4 | -0.3793+0.5685i |
5 | -0.5685+0.3793i |
6 | -0.5940+1.0863i |
7 | -1.0863+0.5940i |
8 | 0.3793-0.5685i |
9 | 0.5685-0.3793i |
10 | 0.5940-1.0863i |
11 | 1.0863-0.5940i |
12 | -0.3793-0.5685i |
13 | -0.5685-0.3793i |
14 | -0.5940-1.0863i |
15 | -1.0863-0.5940i |
Code check be 1/3 planisphere corresponding to LDPC code be:
Constellation point | Constellation symbol |
0 | 0.3040+0.4974i |
1 | 0.4974+0.3040i |
2 | 0.5375+1.1710i |
3 | 1.1710+0.5375i |
4 | -0.3040+0.4974i |
5 | -0.4974+0.3040i |
6 | -0.5375+1.1710i |
7 | -1.1710+0.5375i |
8 | 0.3040-0.4974i |
9 | 0.4974-0.3040i |
10 | 0.5375-1.1710i |
11 | 1.1710-0.5375i |
12 | -0.3040-0.4974i |
13 | -0.4974-0.3040i |
14 | -0.5375-1.1710i |
15 | -1.1710-0.5375i |
Code check be 5/12 planisphere corresponding to LDPC code be:
Constellation point | Constellation symbol |
0 | 0.2712+0.4931i |
1 | 0.4931+0.2712i |
2 | 0.5068+1.1943i |
3 | 1.1943+0.5068i |
4 | -0.2712+0.4931i |
5 | -0.4931+0.2712i |
6 | -0.5068+1.1943i |
7 | -1.1943+0.5068i |
8 | 0.2712-0.4931i |
9 | 0.4931-0.2712i |
10 | 0.5068-1.1943i |
11 | 1.1943-0.5068i |
12 | -0.2712-0.4931i |
13 | -0.4931-0.2712i |
14 | -0.5068-1.1943i |
15 | -1.1943-0.5068i |
Code check be 1/2 planisphere corresponding to LDPC code be:
Constellation point | Constellation symbol |
0 | 0.2569+0.5002i |
1 | 0.5002+0.2569i |
2 | 0.4995+1.1977i |
3 | 1.1977+0.4995i |
4 | -0.2569+0.5002i |
5 | -0.5002+0.2569i |
6 | -0.4995+1.1977i |
7 | -1.1977+0.4995i |
8 | 0.2569-0.5002i |
9 | 0.5002-0.2569i |
10 | 0.4995-1.1977i |
11 | 1.1977-0.4995i |
12 | -0.2569-0.5002i |
13 | -0.5002-0.2569i |
14 | -0.4995-1.1977i |
15 | -1.1977-0.4995i |
Code check be 7/12 planisphere corresponding to LDPC code be:
Constellation point | Constellation symbol |
0 | 0.2480+0.5212i |
1 | 0.5212+0.2480i |
2 | 0.4920+1.1937i |
3 | 1.1937+0.4920i |
4 | -0.2480+0.5212i |
5 | -0.5212+0.2480i |
6 | -0.4920+1.1937i |
7 | -1.1937+0.4920i |
8 | 0.2480-0.5212i |
9 | 0.5212-0.2480i |
10 | 0.4920-1.1937i |
11 | 1.1937-0.4920i |
12 | -0.2480-0.5212i |
13 | -0.5212-0.2480i |
14 | -0.4920-1.1937i |
15 | -1.1937-0.4920i |
Code check be 2/3 planisphere corresponding to LDPC code be:
Constellation point | Constellation symbol |
0 | 0.2836+0.2836i |
1 | 0.9590+0.2836i |
2 | 0.2836+0.9590i |
3 | 0.9590+0.9590i |
4 | -0.2836+0.2836i |
5 | -0.9590+0.2836i |
6 | -0.2836+0.9590i |
7 | -0.9590+0.9590i |
8 | 0.2836-0.2836i |
9 | 0.9590-0.2836i |
10 | 0.2836-0.9590i |
11 | 0.9590-0.9590i |
12 | -0.2836-0.2836i |
13 | -0.9590-0.2836i |
14 | -0.2836-0.9590i |
15 | -0.9590-0.9590i |
Code check be 3/4 planisphere corresponding to LDPC code be:
Constellation point | Constellation symbol |
0 | 0.2875+0.2875i |
1 | 0.9578+0.2875i |
2 | 0.2875+0.9578i |
3 | 0.9578+0.9578i |
4 | -0.2875+0.2875i |
5 | -0.9578+0.2875i |
6 | -0.2875+0.9578i |
7 | -0.9578+0.9578i |
8 | 0.2875-0.2875i |
9 | 0.9578-0.2875i |
10 | 0.2875-0.9578i |
11 | 0.9578-0.9578i |
12 | -0.2875-0.2875i |
13 | -0.9578-0.2875i |
14 | -0.2875-0.9578i |
15 | -0.9578-0.9578i |
Code check be 4/5 planisphere corresponding to LDPC code be:
Constellation point | Constellation symbol |
0 | 0.2932+0.2932i |
1 | 0.9560+0.2932i |
2 | 0.2932+0.9560i |
3 | 0.9560+0.9560i |
4 | -0.2932+0.2932i |
5 | -0.9560+0.2932i |
6 | -0.2932+0.9560i |
7 | -0.9560+0.9560i |
8 | 0.2932-0.2932i |
9 | 0.9560-0.2932i |
10 | 0.2932-0.9560i |
11 | 0.9560-0.9560i |
12 | -0.2932-0.2932i |
13 | -0.9560-0.2932i |
14 | -0.2932-0.9560i |
15 | -0.9560-0.9560i |
Code check be 5/6 planisphere corresponding to LDPC code be:
Constellation point | Constellation symbol |
0 | 0.2955+0.2955i |
1 | 0.9553+0.2955i |
2 | 0.2955+0.9553i |
3 | 0.9553+0.9553i |
4 | -0.2955+0.2955i |
5 | -0.9553+0.2955i |
6 | -0.2955+0.9553i |
7 | -0.9553+0.9553i |
8 | 0.2955-0.2955i |
9 | 0.9553-0.2955i |
10 | 0.2955-0.9553i |
11 | 0.9553-0.9553i |
12 | -0.2955-0.2955i |
13 | -0.9553-0.2955i |
14 | -0.2955-0.9553i |
15 | -0.9553-0.9553i |
To the bitstream data (b after Bit Interleave
0, b
1..., b
n-1), according to 16QAM planisphere, the decimal number corresponding to every four binary bit sequence is mapped to some constellation point, obtains symbol stream (the corresponding constellation point of each complex symbol).For with code check for planisphere corresponding to 1/5LDPC code, four corresponding decimal numbers of bit ' 1101 ' of input are 13, then correspond to the constellation point of-0.6317-0.4639i in corresponding 16QAM planisphere, this constellation point being shown as on real number axis and axis of imaginaries, real number axis-0.6317, axis of imaginaries-0.4639.Then utilize symbol stream to carry out generation OFDM symbol at modulation module, finally launch.
In the present embodiment, described LDPC code word be to message sink coding after bit stream obtain after specific LDPC coding, wherein said specific LDPC coding can adopt prior art to realize.
The embodiment of the present invention additionally provides a kind of deinterleaving de-mapping method of LDPC code word.As shown in Figure 2 be the schematic flow sheet of the embodiment of the deinterleaving de-mapping method of a kind of LDPC code word of the present invention.With reference to figure 2, the deinterleaving de-mapping method of LDPC code word comprises the steps:
Step S21: soft demapping process is carried out to obtain bit soft value data according to specific planisphere to symbol stream soft value data;
Step S22: described bit soft value data are carried out deinterleaving according to certain de-interweaving method and interlacing pattern, obtains the bit soft value data after than deinterleave;
Step S23: LDPC decoding process is carried out to obtain decoded bitstream data to described bit soft value data flow.
Although the present invention with preferred embodiment openly as above; but it is not for limiting the present invention; any those skilled in the art without departing from the spirit and scope of the present invention; the Method and Technology content of above-mentioned announcement can be utilized to make possible variation and amendment to technical solution of the present invention; therefore; every content not departing from technical solution of the present invention; the any simple modification done above embodiment according to technical spirit of the present invention, equivalent variations and modification, all belong to the protection range of technical solution of the present invention.
Claims (13)
1. an interlace map method for LDPC code word, is characterized in that, comprise the steps:
Described LDPC code word is carried out Bit Interleave according to certain deinterleaving method and interlacing pattern, obtains the LDPC code word after interweaving;
Carry out constellation mapping to obtain symbol stream to the LDPC code word after described Bit Interleave according to corresponding planisphere, wherein, described planisphere is corresponding with the LDPC code of specific code check.
2. the interlace map method of LDPC code word as claimed in claim 1, it is characterized in that, the code length of described LDPC code word is 19200 or 57600 bits.
3. the interlace map method of LDPC code word as claimed in claim 1, it is characterized in that, the code check of described LDPC code word is 1/5;
Corresponding planisphere is:
4. the interlace map method of LDPC code word as claimed in claim 1, it is characterized in that, the code check of described LDPC code word is 1/4;
Corresponding planisphere is:
5. the interlace map method of LDPC code word as claimed in claim 1, it is characterized in that, the code check of described LDPC code word is 1/3;
Corresponding planisphere is:
6. the interlace map method of LDPC code word as claimed in claim 1, it is characterized in that, the code check of described LDPC code word is 5/12;
Corresponding planisphere is:
7. the interlace map method of LDPC code word as claimed in claim 1, it is characterized in that, the code check of described LDPC code word is 1/2;
Corresponding planisphere is:
8. the interlace map method of LDPC code word as claimed in claim 1, it is characterized in that, the code check of described LDPC code word is 7/12;
Corresponding planisphere is:
9. the interlace map method of LDPC code word as claimed in claim 1, it is characterized in that, the code check of described LDPC code word is 2/3;
Corresponding planisphere is:
10. the interlace map method of LDPC code word as claimed in claim 1, it is characterized in that, the code check of described LDPC code word is 3/4;
Corresponding planisphere is:
The interlace map method of 11. LDPC code words as claimed in claim 1, is characterized in that, the code check of described LDPC code word is 4/5;
Corresponding planisphere is:
The interlace map method of 12. LDPC code words as claimed in claim 1, is characterized in that, the code check of described LDPC code word is 5/6;
Corresponding planisphere is:
The deinterleaving de-mapping method of 13. 1 kinds of LDPC code words, is characterized in that, comprise the steps:
Soft demapping process is carried out to obtain bit soft value data according to corresponding planisphere to symbol stream soft value data; Wherein said symbol stream soft value data are the symbol stream that interlace map method that receiving terminal receives LDPC code word as claimed in claim 1 obtains;
Described bit soft value data are carried out deinterleaving according to certain de-interweaving method and Bit Interleave pattern, obtains the bit soft value data flow after deinterleaving.
LDPC decoding process is carried out to obtain decoded bitstream data to described bit soft value data flow.
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CN108667556A (en) * | 2017-03-29 | 2018-10-16 | 上海交通大学 | Bit Interleaved Coded Modulation method and its deinterleaving decoding demodulation method |
CN111371528A (en) * | 2018-12-26 | 2020-07-03 | 上海交通大学 | Interleaving mapping method and de-interleaving de-mapping method of LDPC code words |
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WO2009017814A3 (en) * | 2007-08-01 | 2009-04-02 | Sirius Xm Radio Inc | Method and apparatus for interleaving low density parity check (ldpc) codes over mobile satellite channels |
CN101488819A (en) * | 2008-01-15 | 2009-07-22 | 华为技术有限公司 | LDPC code encoding modulation method and apparatus |
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WO2009017814A3 (en) * | 2007-08-01 | 2009-04-02 | Sirius Xm Radio Inc | Method and apparatus for interleaving low density parity check (ldpc) codes over mobile satellite channels |
CN101488819A (en) * | 2008-01-15 | 2009-07-22 | 华为技术有限公司 | LDPC code encoding modulation method and apparatus |
Cited By (3)
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CN108667556A (en) * | 2017-03-29 | 2018-10-16 | 上海交通大学 | Bit Interleaved Coded Modulation method and its deinterleaving decoding demodulation method |
CN108667556B (en) * | 2017-03-29 | 2021-07-30 | 上海交通大学 | Bit interleaving coding modulation method |
CN111371528A (en) * | 2018-12-26 | 2020-07-03 | 上海交通大学 | Interleaving mapping method and de-interleaving de-mapping method of LDPC code words |
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