基于白化残留ICI和噪声的最优线性ICI消除算法  

Optimal Linear ICI Cancellation Algorithm Based on Whitening Residual ICI and Noise

作　　者：惠永涛[1] 李兵兵[1] 同钊[1] 

机构地区：[1]西安电子科技大学综合业务网理论及关键技术国家重点实验室,西安710071

出　　处：《北京邮电大学学报》2014年第4期49-53,共5页Journal of Beijing University of Posts and Telecommunications

基　　金：国家自然科学基金项目(61271299);中央高校基本科研业务费专项资金项目(K5051301034);高等学校学科创新引智计划项目(B08038)

摘　　要：针对传统算法将残留载波间干扰(ICI)当白噪声处理引起系统性能下降的问题,提出一种白化残留ICI和噪声的最优线性ICI消除算法.首先对残留ICI和噪声进行白化,其次基于最大化系统可达速率,推出了最优线性ICI消除矩阵,并结合连续干扰消除算法,实现了时变信道带来的时间分集.仿真结果表明,该算法克服了传统算法带状近似引起系统性能损失的缺点,并适用于当前信道估计精度下的OFDM系统.To reduce the complexity, the existing algorithms treat the residual inter-carrier interference （ICI） as white noise,which causes a decline in system performance. Consequently, an optimal linear ICI cancellation algorithm based on whitening residual ICI and noise was proposed. Firstly, the whiten matrix is constructed to whiten the residual ICI and noise simultaneously. Then, the optimal linear ICI cancella- tion matrix was deduced by maximizing the achievable rate in orthogonal frequency division multiplexing （OFDM） systems, which can obtain the time diversity embedded in time variant channels combining with successive interference cancellation. Simulations show that the proposed algorithm obviates the perform- ance loss introduced by band approximation in traditional algorithms and can apply to OFDM systems in the channel estimation accuracy at present.

关 键 词：正交频分复用 残留载波间干扰 带状近似 白化矩阵 

分 类 号：TN911.22[电子电信—通信与信息系统]