一种高速率的重叠复用传输系统及检测译码性能
doi: 10.3724/SP.J.1146.2007.01320
A High-speed Overlapped Multiplexing Transmission System and the Detection/Decoding Algorithm Performance
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摘要: 该文研究了AWGN信道下重叠时分复用系统(OvTDM)及性能；在此基础上，研究了信道编码的OvTDM系统，并给出了最佳的检测译码算法-最大后验概率准则下的软入软出迭代算法。OvTDM系统与同频谱效率的QAM调制相比较，随着频谱效率的提高显示出性能增益。信道编码的OvTDM系统接收端在最大后验概率(MAP)准则下，检测与译码之间传递软信息进行迭代处理。仿真结果表明，软入软出迭代算法充分利用了符号重叠所自然形成的编码约束关系，获得了最大编码增益。Abstract: A high-speed data transmission system (Overlapped Time Division Multiplexing System, OvTDM) and its performace are researched in AWGN channel. Simultaneously, the channel coded OvTDM system is researched. The optimal algorithm, which is soft-in soft-out Maximum A Posteriori probability (MAP) iterative joined detection and decoding algorithm is proposed for the coded OvTDM system. Simulation results show that the BER performance of the OvTDM system is better than that of the conventional QAM system under the same spectral efficiency. For the channel coded OvTDM system, the MAP soft-in soft-out iterative algorithm fully utilizes the encoding constraints formed by the OvTDM and obtains the optimal performance.
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