J4 ›› 2011, Vol. 33 ›› Issue (3): 167-171.doi: 10.3969/j.issn.1007130X.2011.
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ZHANG Zhongming,XU Ba,YANG Jun,ZHANG Eryang
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Abstract:
The decoding of the LDPC codes by the belief propagation (BP) algorithm for the additive white Gaussian noise (AWGN) channel requires an accurate estimation of the signaltonoise ratio (SNR) for the computation of the a posteriori probabilities (APPs) of the received bits that serve as the decoder inputs. An erroneous estimation of SNR at the decoder is referred to as SNR mismatch. In this paper, we study the effects of the SNR mismatch on the bit error rate (BER) performance of the LDPC codes for the AWGN channel. The correctfactor function is achieved by approximating the check node update equation of the BP algorithm. It is concluded that the effect of SNR underestimation on decoding is more sensitive than SNR overestimation based on the correctfactor function. The simulation results also indicate the conclsion.
Key words: LDPC codes;belief propagation algorithm;SNR mismatch
ZHANG Zhongming,XU Ba,YANG Jun,ZHANG Eryang. Effects of the SNR Mismatch on Decoding the LDPC Codes[J]. J4, 2011, 33(3): 167-171.
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URL: http://joces.nudt.edu.cn/EN/10.3969/j.issn.1007130X.2011.
http://joces.nudt.edu.cn/EN/Y2011/V33/I3/167
