OFDM系统中混合自动重复请求方案的性能分析

Performance analysis of hybrid automatic repeat request schemes for OFDM systems

混合自动请求重传机制是确保数据通信可靠传输的有效方法 .对不同混合自动重复请求方案在OFDM(or thogonalfrequency divisionmultiplexing)系统中的累计正确分组接收率ACPRR(accumulativecorrectpacketreceptionrate)性能进行了分析 .主要比较了在不同的移动环境下各种混合自动重复请求方案的累计正确分组接收率的性能 ,并从时间分集和频率分集的角度分析了各方案的仿真结果 ,综合考虑重传次数、重传时间间隔等因素在不同移动环境下对系统的影响程度 ,根据仿真结果 ,给出了相应环境下的混合自动重复请求方案的选择策略 .

The hybrid automatic repeat request (HARQ) is an effective mechanism to keep the reliable communication. The accumulative correct packet reception rate (ACPRR) performance of different HARQ schemes used in orthogonal frequency-division multiplexing (OFDM) system is investigated. The simulation focuses on the ACPRR performance of different HARQ schemes in various mobile environments. The simulation results are analyzed from the viewpoint of time diversity and frequency diversity and the effects of different factors on system such as retransmission number and retransmission duration are also considered. According to the simulation results, we give the strategies to choose HARQ schemes in different OFDM systems.