Abstract: Multi-Symbol Detection (MSD) and Turbo Product Code (TPC) can greatly improve the performance of PCM/FM (Pulse Code Modulation/Frequency Modulation) telemetry system. To solve the high computational complexity issues in MSD algorithm, an improved algorithm which reduced the computational complexity of MSD was proposed. Chase decoding algorithm for TPC also reduced the system memories by simplifying the calculation of the soft input information. The simulation results show that despite of 1.7dB loss, the improved algorithm still obtains about 8dB performance gain. Because of low-complexity and low system memories, it is more suitable for hardware implementation.

Key words: Pulse Code Modulation/Frequency Modulation (PCM/FM), Multi-Symbol Detection (MSD), Turbo Product Code (TPC), Chase decoding, low-complexity, low system memory

摘要： 多符号检测(MSD)和Turbo乘积码(TPC)技术联合应用可以大幅提高脉冲编码调制/调频(PCM/FM)遥测系统性能。针对MSD算法计算复杂度高的问题提出了一种改进的MSD算法，可以有效降低计算复杂度；在TPC的传统Chase译码算法中通过简化软输入信息计算可以降低系统存储量。仿真结果表明，改进方法和传统的两种技术联合使用相比，虽然损失了约1.7dB解调增益，但仍提高PCM/FM信号解调性能约8dB，且算法复杂度低，存储量小，更适合硬件实现。

关键词: 脉冲编码调制/调频, 多符号检测, Turbo乘积码, Chase译码, 低复杂度, 低系统存储量