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采用Wimax标准下的准循环LDPC码与抗干扰能力较强的QPSK调制的信道方案对数字语音通信系统的信道译码性能进行仿真研究.采用TDMP-NMS为准循环LDPC码的信道译码算法,并将其与对数域BP算法及卷积码译码进行误码性能对比.仿真结果表明,在高斯白噪声信道下QC-LDPC码的TDMP-NMS算法的误码性能较对数域BP算法和卷积码译码性能好,较好地抑制了噪声干扰,满足语音通信要求,对实际的数字语音通信有一定的参考意义.
The quasi-cyclic LDPC codes under Wimax standard and QPSK modulated channel schemes with strong anti-interference ability are used to simulate the channel decoding performance of digital voice communication system.Using TDMP-NMS as the channel decoding algorithm for cyclic LDPC codes, And compares it with the BP algorithm in the logarithmic domain and the decoding performance of the convolutional code.The simulation results show that the error performance of the TDMP-NMS algorithm of QC-LDPC codes in Gaussian white noise channel is better than that of the logarithm domain BP algorithm And convolutional code decoding performance, better suppress the noise interference to meet the requirements of voice communications, the actual digital voice communication has a certain reference value.