一种基于恒模算法的多用户盲波束形成新方法

Simple CMA Beamforming for Multiple Sources and Direction Finding

提出了一种适用于多用户的盲波束形成新方法 .该方法基于最小二乘恒模算法 ,当最小二乘恒模算法收敛于某一信号后 ,我们导出了算法的权向量与其它用户波达方向的关系 ,进而在不同用户的波达方向上形成初始增益 ,从而实现对所有用户的波束形成 .文中给出了算法的并行和串行实现方案 .

Blind adaptive beamforming is an elementary problem in the area of spatial signal processing. The constant modulus (CM) array is blind adaptive beamformer capable of recovering a CM signal among several cochannel sources by using constant modulus algorithm (CMA). By adding an adaptive signal canceller to the CM beamformer, identical stages of the CM array and signal canceller may be used in a multistage system to recover several cochannel CM sources. However, the implementation of the multistage CM array is complicated. We will provide a simple multistage CM array to recover several cochannel signals based on least square CMA (LS-CMA). After the LS-CMA captures one signal, the DOA of the other signals could be attained from the weight vector of the algorithm, which is used for multi-source beamforming. The parallel and serial implementations for the algorithm are presented. Computer simulations show that the results of the new algorithm are close to those of Wiener's, which confirms the effectiveness of this new approach.