节点文献
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
【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。
【Abstract】 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;
【Key words】 OFDM; LDPC (Low-Density Parity-Check) codes; adaptive modulation; soft demodulation;
【Key words】 OFDM; LDPC (Low-Density Parity-Check) codes; adaptive modulation; soft demodulation;
- 【文献出处】 电路与系统学报 ,Journal of Circuits and Systems , 编辑部邮箱 ,2005年03期
- 【分类号】TN919.3
- 【被引频次】6
- 【下载频次】208