关键词: 信道编码理论, 最小和译码算法, 量化

Abstract: In order to reduce the implementation complexity of the quantized decoding algorithm for the Low-Density Parity-Check（LDPC） codes, an improved 4-bit quantized Adaptive-Offset Min-Sum（AOMS） algorithm is designed. The improved AOMS algorithm is obtained by introducing a pre-determined iteration number as the condition of adaptive selecting the offset factors. Furthermore, a 4-bit nonuniform quantization scheme is designed, which can guarantee the dynamic range of the extrinsic information and easily utilize the optimized quantized offset factors. The simulation results show that, compared with the floating-point decoding algorithms, the performance degradation of the improved 4-bit nonuniform quantized AOMS algorithm can be neglected.

Key words: channel coding theory, Min-Sum（MS） algorithm, quantization