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文中设计了一种适于对声码器的输出码流进行前向纠错编码的低密度奇偶校验码(LDPC码)。该低密度奇偶校验码具有半规则化的结构,编码简单,存储量少,调整码率方便,易于硬件实现。文中同时对汉明码、卷积码、Turbo码、低密度奇偶校验码分别在AWGN、Rayleigh信道下的传输性能进行了仿真比较。仿真结果表明,长度适合的LDPC码误码性能远超过汉明码、卷积码,综合性能与Turbo码接近。
In this paper, a low density parity check code (LDPC code) suitable for forward error correction encoding of the vocoder output stream is designed. The low-density parity-check code has a semi-regularized structure, which has the advantages of simple coding, less memory, convenient code rate adjustment and easy hardware implementation. In the meantime, the transmission performance of Hamming code, convolutional code, Turbo code and low density parity check code in AWGN and Rayleigh channel are simulated and compared. The simulation results show that the performance of LDPC codes with suitable length far exceeds Hamming code and convolutional code, and the overall performance is close to that of Turbo codes.