一种新的适应于OFDM系统的载波间干扰抑制方案  

Novel inter-carrier interference mitigation scheme for OFDM systems

作　　者：陈拿权[1] 张建华[1] 张平[1] 

机构地区：[1]北京邮电大学无线新技术研究所,北京100876

出　　处：《西安电子科技大学学报》2008年第4期726-732,共7页Journal of Xidian University

基　　金：国家自然科学基金资助(60302025);"863"国家高科技资助(2006AA01Z283;2006AA01Z260)

摘　　要：针对高速移动环境下多普勒效应引起的载波间干扰严重影响了正交频分复用系统的性能问题,提出了新的基于时域干扰自消除的载波间干扰抑制算法.该算法基于符号重复的正交频分复用系统,在接收端进行一系列的信号处理后,得到大量具有不同附加延时的重构正交频分复用符号;之后,利用信道的统计特性对这些重构的正交频分复用符号进行合并接收,从而抑制载波间干扰.仿真与分析表明,时域干扰自消除能有效地抑制载波间干扰,提高系统性能,为高速移动环境中应用正交频分复用提供了一种有效的解决方案.In high-speed mobile environment, the inter-carrier interference （ICI） caused by the Doppler effect degrades the performance of the orthogonal frequency division multiplexing （OFDM） system. In order to lessen the severe effects of ICI, a novel ICI mitigation algorithm is proposed, which is called the time-domain ICI self-cancellation （TDISC）. In this algorithm, the repeated symbol is used at the transmit side, and large numbers of reconstructed OFDM symbols with different additional delays are obtained by some manipulations of the received data, and then diversity combination of these reconstructed OFDM symbols is applied by using the channel statistic property at the receive side, and thus the system performance of ICI suppression is improved. Through simulations and analyses, it is proved that the TDISC can effectively combat the ICI, improve system performance and, consequently, be an effective solution to the implementation of OFDM in high-speed mobile environment.

关 键 词：正交频分复用 载波间干扰 时域干扰自消除 附加延时 信道统计特性 高速移动环境 

分 类 号：TN911.4[电子电信—通信与信息系统]