Design And Implementation Of LDPC Decoder Based On CMMB Transmission System

LDPC Codes s an error-correcting code with extremely excellent performance, owns highly effective decoding algorithm. Also its decoding is simple, feasible and parallel. It's convenient for hardware implementation. The research on LDPC Codes becomes one of the hotspots in channel transmitting field.This paper analyzed in theory, simulated by computer, implemented in hardware languages for decoding LDPC codes in the demodulator of CMMB transmission system. The works are as follows: Because LDPC Codes belongs to linear grouping-codes, this paper gave a brief theoretical introduction to linear grouping-code, and next the content concerns the concept and definition of LDPC codes. Meanwhile the paper deduced the BP decoding algorithm and form-changed decoding algorithms, and showed the decoding performance of LDPC Codes based on CMMB transmission system. Finally the paper proposed how to work out ASIC design and the implementation of LDPC decoder availably.The feature of this paper is using the characteristic of LDPC Codes based on CMMB transmission system to optimize the memorizer design, it has greatly minished the area of this chip. So it has certain practical value.