多径衰落信道下OFDM系统的仿真性能分析

构建了正交频分复用(OFDM)系统的仿真模型,给出了具体信道的参数.在不同信道传输环境下,对不同调制方式和不同移动速度下的OFDM系统性能进行了分析比较,在仿真结果的基础上给出了OFDM系统抗多普勒频移的参考方案,采用的信道模型基于ITU-R M.1225 Channel B瑞利(Rayleigh)衰落信道.最后,在基于COST 207的信道模型下,对四种典型环境的OFDM系统进行了仿真研究,并对其结果作了讨论分析.结果表明:在多径衰落信道下,OFDM系统可以有效克服多径衰落和多普勒频移,能够应用于未来的通信系统.

Simulation Performance Analysis of OFDM System in Multipath Fading Channels

This paper attempts to establish an OFDM system simulation model and present the idiographic channel parameters. The OFDM performances in various transmission environments are compared and analyzed in terms of modulation methods and mobile velocity. Simultaneously, based on the simulation results about BER performance of OFDM system, it presents a good reference scheme for resisting Doppler effect. The channel model employed is ITU -R M. 1225 channel B Rayleigh channels . Finally, four typical circumstances based on the COST 207 channel model are simulated, the results of which are discussed and analyzed. The simulation results indicate that the OFDM system, in the muhipath fading channels, can efficiently overcome muhipath fading and Doppler effect and can be applied in future communication system.