一种OFDM系统的自适应配置干扰抵消方法  

Adaptive allocation MPIC algorithm for multi-carrier system

作　　者：刘召伟[1] 沈瑞静[1] 王宗欣[1] 

机构地区：[1]复旦大学通信工程系,上海200433

出　　处：《吉林大学学报（工学版）》2007年第1期188-191,共4页Journal of Jilin University:Engineering and Technology Edition

基　　金：国家自然科学基金资助项目(60572124)

摘　　要：分析了目前OFDM系统中当信道时延大于保护间隔时,采用信道压缩方法后存在的问题,指出了信道压缩后目标信道某些频点产生深衰落的可能性,提出了一种OFDM传输系统中双重自适应配置的多径干扰抵消方法。通过自适应配置与信道压缩相结合的方法克服了压缩后由目标信道频率深衰落产生的较低信噪比的子载波在频域均衡时的影响,在减少系统保护间隔开销的同时进一步改善了误码率;通过蒙特卡洛(MONTE CARLO)方法在无线信道条件下对算法进行了模拟,模拟结果显示该方法能有效改善系统性能。The problem of Time Domain Equalization （TEQ） in multi-carrier system when channel spread time is longer than guard interval was analyzed, and the probability of heavy-fading in some sub-carriers in target channel after channel shortening was given. A new doubly Adaptive Allocation Multi path Interference canceller （AL-MPIC） algorithm for multi-carrier system combating lower SNR frequency effect of heavy-fading sub-channels caused from channel shortening was proposed. The method combining the TEQ and adaptive allocation is not only able to suppress Cyclic Prefix Guard Interval （CP-GI） but also to improve system BER performance. The simulations of the algorithm under wireless channel condition using MONTE CARI.O method were presented and show the effective improvement of the system performance.

关 键 词：通信技术 正交频分复用 自适应配置 多径干扰抵消 时域均衡 循环前缀保护间隔 

分 类 号：TN911.4[电子电信—通信与信息系统]