OFDM系统中干扰消除技术的分析

Analysis on the Technologies of Eliminate Interferences in OFDM System

正交频分复用(OFDM)技术已被越来越多的人所关注,并且在IEEE802.11无线局域网中得到实际应用.在OFDM系统中为了消除符号间干扰(ISI)和子载波间干扰(ICI),一般要采用加入循环前缀(CP)的技术.从信道对信号作用方面分析了循环前缀技术消除干扰的过程,并给出了仿真结果.结果表明,循环前缀的加入可以有效地消除符号间干扰(ISI)和子载波间干扰(ICI).

Orthogonal frequency division multiplexing （OFDM） has received more and more attention and has been applied to IEEE 802.11 wireless LAN. Usually a cyclic prefix was applied in OFDM sys- tem. In this paper, the process of cyclic prefix to eliminate interferences were analysed by considering the Channel to signal function,its simulation result was also given. The results show that adding the prefix cycle can effectively eliminate inter-symbol interference （ISI） and inter-carrier interference （ICI）.