一种基于自适应调制的LDPC-COFDM系统性能研究  

Performance of Low-Density Parity-Check (LDPC) Coded OFDM system based on adaptive modulation

作　　者：贾治华[1] 邓建国[1] 田丰[1] 

机构地区：[1]西安交通大学电子与信息工程学院,陕西西安710049

出　　处：《电路与系统学报》2005年第3期136-139,共4页Journal of Circuits and Systems

摘　　要：本文研究了一种基于自适应调制和软解调算法的LDPC-COFDM(LDPCCodedOFDM)系统模型,该自适应调制方案根据各个子信道的信道增益来自适应地分配比特。文中对自适应调制和软解调算法进行了讨论和分析,最后给出了仿真结果。仿真结果表明,基于自适应调制的LDPC-COFDM能够有效提高系统的误码性能,适应多径衰落信道的时变特性。A LDPC-COFDM system model, which based on adaptive modulation and soft demodulation, was analyzed. The system allocates the bits according to the channel gain of each sub-channel adaptively. The adaptive modulation and the soft demodulation algorithms were discussed and the simulation results were presented. The simulation results show that the model can effectively improve the bit-error-rate performance of the system, adapting to the time-variant behavior of the multipath fading channel.

关 键 词：正交频分复用 低密度奇偶校验码 自适应调制 软解调 

分 类 号：TN911[电子电信—通信与信息系统]