针对在某些通信系统中对译码速度较高的需求,基于分组编码调制(BCM,Block Coding Modulation)的多级结构,给出了一种多级BCM的多阶段译码算法:从BCM中第一级分量码开始,根据BCM的级数逐阶段进行译码,针对每级分量码,采用软判决最大似然译码,直到最后一级分量码,从而降低了译码复杂度.仿真结果表明,与传统Viterbi译码算法相比,提出的多阶段译码算法的误码性能与其相当,信噪比较小时甚至更好,但译码复杂度远低于传统Viterbi译码方法. Aiming at the requirement of high decoding speed in some communication systems, a multi-stage decoding algorithm based on BCM (Block Coding Modulation) is proposed. From multi-stage BCM The first-order component codes begin with the stages of BCM decoding, and for each component code, the soft-decision maximum likelihood decoding is adopted until the last-level component codes, thus reducing the decoding complexity. The simulation results The results show that compared with the traditional Viterbi decoding algorithm, the proposed multi-stage decoding algorithm has the same bit error performance as the traditional Viterbi decoding algorithm, and the SNR is even better. However, the decoding complexity is much lower than the traditional Viterbi decoding method.