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MP&A Mixed Decoding Algorithm for LDPC Codes

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2 Author(s)
Ho, C.L. ; Dept. of Commun. Eng., Nat. Central Univ., Chung-Li ; Hsu-Hung Yang

Because the message passing (MP) method is suboptimum and optimum solutions are not guaranteed, we present a hybrid decoding method by combing the MP and the A* methods. We first make comparison between the MP and A* method and then show their combined performance. Using the hybrid structure, its decoding gain is the same as that of A* method. Moreover, decoding complexity is slightly greater than that of MP one. For codeword length 96 bits and coding rate 1/2 and BER = 10-5 , the hybrid structure outperforms 1.4 dB decoding gain than the MP method. This improvement only required 1% received sequences to be transferred to A* decoding block. Our newly designed hybrid structure can solve both of the high decoding gain and low decoding complexity while it has the ability to yield the optimum solution.

Published in:

Communication Networks and Services Research, 2007. CNSR '07. Fifth Annual Conference on

Date of Conference:

14-17 May 2007