该文分析了传统逐幸存路径处理(Per-Survivor Processing, PSP)算法模型，给出了改进的前馈非二元码软输出维特比(Soft Output Viterbi Algorithm, SOVA)PSP算法。针对单路定时准确的情况，提出了针对成对载波复用多址(Paired Carrier Multiple Access, PCMA)信号的SOVA-PSP盲分离算法。该算法相对传统的PSP算法状态数由原来的M2(L-1)减少到M(L-1)(其中M为调制阶数，L为等效信道响应长度)，从而大幅度地降低了算法复杂度。仿真结果表明，改进的算法在降低复杂度的同时与传统PSP算法相比性能几乎没有损失。
The traditional algorithm of the Per-Survivor Processing (PSP) model is analyzed, and the improved algorithm of nonbinary Soft-Output Viterbi Algorithm and PSP (SOVA-PSP) with soft output for feedforward are given. For the condition of the single way timing accurate, the SOVA-PSP algorithm on blind separation of Paired Carrier Multiple Access (PCMA) signals is presented. Relative to the traditional PSP algorithm, the state of the proposed algorithm is reduced from M2(L-1) to M(L-1) (M is the order of the modulator, L is the length of equivalent channel response), so as to greatly reduce the algorithm complexity. Simulation results demonstrate that, compared with the traditional algorithm of PSP, the improved algorithm can reduce the complexity with almost no performance loss.