摘要
针对超宽带系统中的多址干扰和码间干扰问题,提出了一种低复杂度的盲自适应接收机,该接收机首先采用多级维纳滤波算法抑制多址干扰并提取期望信号各多径分量;再进一步采用紧缩近似投影子空间跟踪方法估计信道并进行最大比合并,提高输出信干噪比。仿真结果表明,其误码性能优于匹配滤波器、传统Rake接收机、解相关Rake接收机和基于恒模算法的自适应接收机,且收敛速度较快、复杂度较低。
A low-complexity blind adaptive receiver for ultra-wideband（UWB） systems in the presence of both multiple access interference（MAI） and inter symbol interference（ISI） is proposed,which is composed of two stages.In the first stage,a reduced-rank algorithm based on the multi-stage Wiener filter（MSWF） is considered to suppress the MAI and extract multi-path components.Channel estimation using the projection approximation subspace tracking with deflation（PASTd） algorithm and multi-path combining are then performed to further enhance the signal to interference plus noise ratio（SINR） of the desired user in the second stage.The simulation results show that the proposed receiver exhibits reasonably good bit error ratio（BER） performance compared with those of matched filter,conventional Rake receiver,decorrelating Rake receiver and adaptive receiver based on constant modulus algorithm（CMA）.Moreover,it has faster convergence speed and less complexity.
出处
《重庆大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2013年第6期124-129,共6页
Journal of Chongqing University
基金
国家重点基础研究发展计划(973计划)课题资助项目(2009CB320404)
长江学者和创新团队发展计划资助(IRT0852)
高等学校创新引智计划资助项目(B08038)
西安科技大学培养基金(201257)
西安科技大学博士后启动金(2013QDJ035)
关键词
超宽带
多址干扰
多级维纳滤波
紧缩近似投影子空间跟踪
ultra-wideband（UWB）
multiple access interference（MAI）
multi-stage Wiener filter（MSWF）
projection approximation subspace tracking with deflation（PASTd）
