【摘要】 为提高带宽利用率与译码性能,提出一种Multi-h CPM信号的低复杂度软判决算法(LC-SOVA for MHPM),通过将判决符号处所汇聚的2条相位路径的累积度量值之差作为软判决值,以代替已有的二进制硬判决值。仿真结果表明:利用所提出的软判决值可以提高与信道编码级联后的抗误码性能,而不增加额外的计算复杂度。当信道编码采用码率为0.5的Turbo码,调制指数h分别为[8/13 9/13 10/13]与[2/4 3/4]时,误码率为10-5下的软判决编码增益分别可达0.7 dB与0.5 dB。在误码率为10-1的恶劣信道下均可获得约0.3 dB的编码增益。更多还原

【Abstract】 In order to improve the bandwidth utilization efficiency and the decoding performance, a novel low complexity soft-output viterbi algorithm for Multi-h CPM(LC-SOVA for MHPM) is proposed to replace the traditional binary hard-output value with the soft-output value, which is the difference of the metric value of the two converging phase paths for the current symbol. Simulation results show that the proposed LC-SOVA can improve the BER performance and incur no extra complexity compared with the hard-decision algorithms. Specifically, when parameter h is [8/13 9/13 10/13] and [2/4 3/4] with Turbo code of rate 0.5, the performance gain for BER of 10-5 can be improved by 0.7 dB and 0.5 dB, respectively. LC-SOVA still has performance gain of 0.3 dB for BER of 10-1.更多还原