【摘要】 研究了正交频分复用(OFDM)下行链路的混合自动重传请求HARQ(HybridAutomatic-Repeat-Requst)技术,结合自适应编码调制AMC(AdaptiveModulationandCoding),给出了多用户环境下HARQ传输体制及仿真性能。为了保证一定服务质量下提高整个系统的频谱效率、数据通过率,通过AMC实现编码调制方案的粗调,HARQ实现AMC进一步细调,从而使整个系统性能达到最优。更多还原

【Abstract】 Hybrid ARQ structure is studied for OFDM down link. Combining with adaptive modulation and coding, the scheme of HARQ is given for multi-user system. With the scheme, AMC can provide coarse adjust modulation and coding levels, and Harq technique provide exactly adjustment, which can improve frequency effection, increase throughput and provide quality of server. 更多还原