协同系统鲁棒波束成形算法研究  

Robust beamforming algorithm for cooperative system

作　　者：成文婧 徐玉清 刘兆和 王欣[2] 

机构地区：[1]总装工程兵科研一所,江苏无锡21403 [2]国防科学技术大学,湖南长沙410073

出　　处：《电波科学学报》2012年第4期805-811,共7页Chinese Journal of Radio Science

基　　金：博士点基金(20094307110004);国家自然科学基金(60903206)和(61101098)

摘　　要：由于实际很难获得理想信道状态信息(CSI),传统协同波束成形算法性能严重下降。设计对信道误差具有鲁棒性的波束成形算法具有重要的实际意义。针对放大转发协同系统最大化目的节点信噪比(SNR)准则下的波束成形设计,提出对应鲁棒算法。该算法从最坏情况鲁棒设计思想出发,建立保证鲁棒性的最优化问题,应用扩展S引理和Schur补定理将该问题由初始不可解转化为可解的准凸问题,进而求解出保证鲁棒性的波束成形因子。仿真表明:同等CSI偏差下,所提鲁棒算法的中断概率性能优于传统波束成形算法。The performance of conventional beamforming methods for cooperative system degrades severely in the presence of channel state information（CSI） imper- fection, which always occurs in practice. Hence it is of interest to develop beam- forming algorithm that is robust against CSI uncertainties. This paper addresses the problem of robust beamforming design that maximize signal-to-noise ratio （SNR） at the destination node for amplify-and-forward（AF） based cooperative systems. This algorithm formulates the problem by adopting worstcase design to grantee robust property. Based on extended S-lemma and Schur complement theorem, this origi- nally intractable problem can be transformed to a quasiconvex problem, which can be solved efficiently. Then the robust beamforming vector can be obtained. Simula- tion results show that the proposed algorithm provides better outage probability performance compared to the conventional algorithm.

关 键 词：波束成形 鲁棒 最坏情况 放大转发 协同 

分 类 号：TN911[电子电信—通信与信息系统]