摘要
正交频分复用(OFDM)能够有效地对抗频率选择性衰落,插入循环前缀作为保护间隔可以消除符号间干扰,而采用信道估计能够很好地跟踪无线信道的时变特性,从而减弱信道对系统的影响。文章首先阐述了OFDM系统基本模型,并给出OFDM通信系统仿真模型,在频率选择性信道下用Matlab仿真软件完成对OFDM系统发送、信道、接收等部分以及循环前缀与信道估计关键技术的设计,结合计算机仿真重点研究了循环前缀及信道估计对系统误码率性能的影响,得出了采用循环前缀和信道估计技术可以显著地提高系统性能。
Orthogonal Frecluency Division Muitiplexing （OFDM） can be used effectively to agent the frequency-selective fading, inserting cyclic prefix as guard interval can eliminate intesymbol interference, and using channel estimation can well track the time-varying characteristics Of wireless channel to weaken channel influence for the system.The basic model of OFDM system is firstly analyzed in the paper, besides OFDM communication system simulation model is given, the OFDM system under the frequancy selective channel is simulated by using Matlab simulation software, and sanding, channel, receiver,as well as the key technologies of cyclic prefix and channel estimation are designed, the Influence of the cyclic prefix and channel estimation for bit error rats performance of system is researched by computer simulation, performance of system is significantly improved by using cyclic prefix and channel estimation techniques.
出处
《电子质量》
2009年第8期29-31,共3页
Electronics Quality
基金
国家科技支撑计划(2006BAD08B00)
河南省教育厅自然科学研究计划项目(2008A510003)
河南工业大学科研基金(07XZZ009)
