相干多径环境下自适应阵列的性能改进  

Improvement of performance for adaptive array in coherent multipath environment

作　　者：周围[1] 周正中[1] 张德民[2] 

机构地区：[1]电子科技大学通信与信息工程学院,四川成都610054 [2]重庆邮电大学移动通信技术重点实验室,重庆400065

出　　处：《电波科学学报》2007年第3期419-423,435,共6页Chinese Journal of Radio Science

基　　金：国家自然科学基金(#60572089);重庆邮电大学4G移动通信专项资金(A2004-70);重庆邮电大学青年教师基金(A2005-30)

摘　　要：针对传统自适应波束形成算法无法抑制相干干扰的问题,引入了一种预处理技术——自适应加权空间平滑(Weighted Spatial Smoothing,WSS)算法,结合线性约束最小方差准则,可以有效地抑制相干干扰。同时,针对WSS引起的孔径损失,提出了一种对子阵进行相位补偿,利用全阵做波束形成的方法。理论分析和仿真结果表明,该方法对相干干扰的抑制能力明显优于常规均匀空间平滑(Uniform Spatial Smoothing,USS)算法,而且避免了孔径损失。For the traditional adaptive beamforming algorithms can＇t suppress coherent interference, a pre-processing technique named as adaptive weighted-spatialsmoothing algorithm （WSS） was proposed. Combined with the linearly-constrained-minimum-variance criterion （LCMV）, WSS can suppress coherent interference effectively. Furthermore, considering the loss of array aperture caused by WSS, phase compensation was made for each subarray, and an approach using full array for beamforming was proposed. Theoretical analysis and simulation results show that, in suppression of coherent interference, the proposed approach outperforms the conventional uniform-spatial-smoothing algorithm （USS） obviously, and it can avoid the loss of aperture.

关 键 词：无线通信 自适应阵列 加权空间平滑 波束形成 干扰抑制 

分 类 号：TN929.5[电子电信—通信与信息系统]