Joint Iterative Decoding and Noise Variance Estimation Based on Expectation-Maximization
Wang Hang-xian · 2007
Effects of noise variance estimation on the LDPC decoding performance are investigated.Based on the algorithm of expectation-maximization(EM),a noise variance estimation method is obtained.The method is applied to the BP decoding algorithm.Simulations show that,with the proposed method,the observed performance degradation is less than 0.1 dB when the noise variance is unknown.