使用软输入硬输出译码的联合MSDD迭代译码解调器
doi: 10.3724/SP.J.1146.2006.02087
The Combined MSDD Iterative Demodulator Based on SIHO Decoding Algorithm
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摘要: 该文提出了一种使用软输入硬输出(SIHO)Viterbi译码联合多符号差分检测系统(MSDD)的差分解调算法,这种简化算法有前向反馈迭代和后向反馈迭代算法。仿真结果表明,使用后向反馈迭代的DQPSK解调时比相干解调在性能上只恶化1.1dB。还给出了用于卫星通信的FPGA实现的解调器实测结果,其性能比本文提供的仿真结果恶化约0.5dB。Abstract: A new combined MSDD iterative differential demodulation and channel decoding algorithm based on Soft-Input Hard-Output(SIHO) Viterbi decoding algorithm is presented. The new algorithm includes feed-forward iteration method and feed-backward iteration method. Numerous simulation results show that the proposed feed-backward iteration method can get performance only worsen than QPSK corherent demodulation is 1.1dB. Test results of satellite communication demodulator based on FPGA show that the performance only worsen than simulation results about 0.5dB.
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