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Simulation Research of Encoding and Decoding Algorithms of Quasi-Cyclic LDPC Codes Based on DMB-TH System

Author: GaoLiZhen
Tutor: ShiZhiYuan
School: Xiamen University
Course: Circuits and Systems
Keywords: DMB-TH system Quasi-cyclic low-density parity-check codes Decoding algorithm
CLC: TN943
Type: Master's thesis
Year: 2008
Downloads: 78
Quote: 1
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Abstract


Low Density Parity Check (Low-density-parity-check codes, LDPC codes) by Gallager first proposed in 1962 , after many years of silence , inspired by Turbo codes , LDPC codes again become the hotspot of communication technology research . LDPC code is a linear block code based on sparse check matrix , has very good characteristics : close to the Shannon limit performance , decoding is simple and can be implemented in parallel operation , suitable for hardware implementation . The quasi-cyclic LDPC (Ouasi-Cyclic LDPC, QC-LDPC) code is a very important class of LDPC codes, to become superior channel coding in practical applications , the low complexity of the encoding and lower error platform . DMB-TH (Terrestrial Digital Multimedia TV / Handle Broadcasting) Tsinghua University terrestrial digital TV transmission standard with complete independent intellectual property rights in China , and has broad application prospects . DMB-TH system involved in a number of critical technologies , the channel codec occupy very important position . DMB-TH system , the channel coding using a cascade of QC-LDPC code as the inner code , BCH code as the outer code . Elaborated system of DMB-TH principles of the transmitting side , forward error correction encoding module , overview of the characteristics of the QC-LDPC code and on the basis of the principle based on the graph model codec , three kinds of bit rate used in the system of the DMB-TH the QC-LDPC encoding , respectively, using the log-likelihood ratio measure and plot decoding algorithm , the minimum and algorithms, modified minimum and algorithm for decoding , its error performance and decoder complexity . For how to further improve the performance of the QC-LDPC code decoding while reducing the decoding complexity , the hierarchical decoding algorithm used in the system , DMB-TH , and layered decoding and improved minimum and algorithms are combined given performance simulation . The results show that the layered decoding algorithm has the advantages of fast decoding convergence , without changing the conditions of the noise threshold , the decoding iteration number can be halved .

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CLC: > Industrial Technology > Radio electronics, telecommunications technology > TV > Transmission of television signals
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