摘要
基于四阶累积量的盲波束形成算法在估计有用信号方向向量时存在估计误差,导致其构造的最小方差无失真响应(MVDR)波束形成器性能降低。针对此问题,借鉴子空间正交投影思想,提出一种基于四阶累积量的稳健盲波束形成算法。与原算法相比,稳健算法可有效提高有用信号方向向量的估计精度,改进算法的波束形成性能。计算机仿真验证了稳健算法的有效性。
Fourth-order cumulant based on blind beamforming algorithm contained error in estimating steering vector of expected signal, which resulted in degraded capability of minimum variance distortionless response （MVDR） beamformer. Contraposing this problem and using the idea of subspace orthogonal projection, a fourth-order cumulant based on robust blind beamforming algorithm was proposed. Compared with the original one, this new robust algorithm can efficiently increase the estimation precision of steering vector of the expected signal. So the capability of blind beamforming is improved. Computer simulations have proved the validity of this robust algorithm.
出处
《电波科学学报》
EI
CSCD
北大核心
2008年第6期1056-1060,共5页
Chinese Journal of Radio Science
关键词
四阶累积量
盲波束形成
方向向量
稳健性
fourth-order cumulant
blind beamforming
steering vector
robustness
