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| Optimization of Two BP-Based Decoding Algorithms for Short LDPC Codes on Fast Rayleigh Fading Channel |
| Zheng He①; Hu Han-ying②; Lu Pei-zhong③ |
| ①Southwest Inst. of Electron & Telecom Technology, Chengdu 610041, China; ②Dept. of Communications Engineering, Information Engineering University, Zhengzhou 450002, China; ③Dept. of Computer Science and Engineering, Fudan University, Shanghai 200433, China |
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Abstract By using the Minimum Mean Square Error (MMSE) criterion, the design of two improved Belief Propagation (BP)-based, i.e., the scaled BP-based and offset BP-based algorithms is presented, for decoding of short Low-Density Parity-Check (LDPC) codes on the fast Rayleigh fading channel. Based on the MMSE criterion, theoretical formulas and numerical calculations on the optimum factors for these two BP-based algorithms are provided. The simulation results for the (3,6) regular LDPC codes of lengths 504 and 1008 on the fast Rayleigh fading channel demonstrate that the scaled BP-based and offset BP-based algorithms with the proposed factors can achieve the performance better than that of the BP algorithm.
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Received: 13 December 2005
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2007, Vol. 29 
