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提出了非冗余纠错差分检测在软判决译码时的应用。结合 π/ 4 - DQPSK差分解调 ,着重研究了非冗余纠错在软判决译码时的应用 ,给出了具体系统实现时的软件流程图。用计算机仿真了该算法在加性白高斯噪声 ( AWGN)信道和 Rician信道中的性能。仿真表明 ,相对于软判决译码时传统的差分解调 ,该算法在误比特率 BER为 1 0 -4 时在 AWGN信道中有 1 .4d B的性能改善 ,在 Rician信道中同样有显著的性能改善。考虑到了实现损耗 ,实际系统的测试结果与仿真结果相一致。这使得 NEC能够在普遍采用软判决译码的卫星通信系统中应用 ,拓展了 NEC只能用于硬判决的局限 ,从而提高了系统容量和通信质量。
The application of non-redundant error correction differential detection in soft decision decoding is proposed. Combined with π / 4 - DQPSK differential demodulation, the application of non - redundant error correction in soft decision decoding is emphatically studied, and the software flow chart of the system realization is given. The performance of this algorithm in additive white Gaussian noise (AWGN) channel and Rician channel is simulated by computer. The simulation results show that compared with traditional differential demodulation in soft decision decoding, the proposed algorithm has the performance improvement of 1.4 dB in AWGN channel at bit error rate (BER) of 10-4, and also has remarkable performance in Rician channel Performance improvement. Taking into account the realization of loss, the actual system test results and simulation results are consistent. This enables the NEC to be used in satellite communication systems where soft-decision decoding is commonly used, extending the limits of NEC that can only be used for hard-decision to improve system capacity and communication quality.