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Method and system for bit interleaving encoding and modulation

A technology of bit interleaving and coding modulation, which is applied in the field of physical layer transmission, can solve the problems that the transmission performance and the complexity of the receiver cannot be taken into account, and the business requirements and technical requirements of the wireless broadcast communication system cannot be met, so as to ensure transmission reliability and reduce effect of complexity

Active Publication Date: 2015-03-18
SHANGHAI ADVANCED RES INST CHINESE ACADEMY OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In view of the shortcomings of the prior art described above, the purpose of the present invention is to provide a bit interleaved coded modulation method and system, which is used to solve the problem that the existing bit interleaved coded modulation (BICM) scheme cannot take into account both transmission performance and receiver complexity, and cannot Problems of meeting the business requirements and technical requirements of the next generation wireless broadcast communication system

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  • Method and system for bit interleaving encoding and modulation
  • Method and system for bit interleaving encoding and modulation
  • Method and system for bit interleaving encoding and modulation

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Embodiment 1

[0037] This embodiment provides a bit interleaved coding modulation method, such as figure 1 As shown, the bit interleaved coding and modulation method includes:

[0038] Perform forward error correction coding processing on the original traffic channel data input into the communication system to generate a coded bit stream. A further specific implementation process includes: performing a first-layer forward error correction coding process on the original traffic channel data input into the communication system to generate a first coded bit stream; the original traffic channel data is composed of baseband frames, and the baseband frames include At least 1 BB frame, the length of each BB frame is K bch bit; when the error correction code used in the first layer of forward error correction coding process is a BCH code, each BB frame constitutes the information bit of the BCH code m = m ...

Embodiment 2

[0127] In this embodiment, the short FEC length (N ldpc =9600), code rate 1 / 2, and 16-QAM modulation as examples to further illustrate the specific implementation process of the bit interleaved coding and modulation method of the present invention:

[0128] The BCH encoder will have length K bch =4605 information bits m=[m 0 ,m 1 … m 4604 ] T Encoded to be of length N bch = K ldpc =4800 BCH code encoding bits Λ=[λ 0 lambda 1 … λ 4799 ] T =[m 0 ,m 1 … m 4604 , d 0 , d 1 ,...,d 194 ] T .

[0129] The LDPC encoder encodes Λ into a length N ldpc The system code word u=[u of =9600 0 u 1 … u 9599 ] T =[λ 0 lambda 1 … λ 4799 p 0 p 1 …p 4799 ] T .

[0130] In turn, the output bits u of the LDPC encoder i Write to the bit interleaver, the write start position of each column is rotated by t according to Table 5 c ={0 0 0 0 2 4 4 4} bits, the internal structure of the interleaver after writing is as follows Figure 8 shown.

[0131] The sequence...

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Abstract

The invention provides a method and a system for bit interleaving encoding and modulation. The method comprises the following steps of performing forward error correction and encoding on original traffic channel data which is inputted into a communication system, and generating an encoding bit flow; performing the bit interleaving on the encoding bit flow, and generating unit characters, wherein the bit interleaving process comprises the steps of writing the encoding bit flow into a bit interleaver according to lines, performing the line permutation on the bit interleaver, reading out the bits of the bit interleaver according to rows, obtaining an output bit flow, and mapping the output bit flow into unit characters; mapping the unit characters into modulation symbols. The method has the advantages that by designing LDPC (low density parity check) code parameters and structures, the working range of the communication system can downwards extend to -3.6dB in an AWGN (additive white gaussian noise) channel; on the basis of the designed LDPC codes, an auxiliary bit interleaving scheme is designed, the traffic data transmission property of the next-generation wireless broadcasting communication system is further improved by 0.05-0.3dB, the complexity of a receiver in the design and implementation processes is decreased, and the transmission reliability of the traffic data is guaranteed.

Description

technical field [0001] The invention belongs to the technical field of physical layer transmission in communication systems, and relates to a coding and modulation method, in particular to a bit-interleaved coding and modulation (BICM) method and system for a next-generation radio and television wireless (NGB-W) communication system . Background technique [0002] With the rapid development of world economy and culture, the demand of mobile users for information services is increasing rapidly. Relying solely on the traditional broadcasting network or the traditional two-way communication network, it is impossible to realize the optimal transmission of mobile information services. The next-generation radio and television network wireless (NGB-W) communication system can realize the fusion and coexistence of wireless broadcasting and two-way communication, and is an effective way to solve the contradiction between the rapid growth of mobile information service data volume and...

Claims

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Application Information

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IPC IPC(8): H04L1/00
CPCH04L1/0045H04L1/0071
Inventor 王芳寇亚军王晓妮田金凤李明齐封松林姜明
Owner SHANGHAI ADVANCED RES INST CHINESE ACADEMY OF SCI
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