An Adaptive Multistage Beamforming Receiver with a Low Complexity
Xie Ning①②; Zhou Yuan-ping③; Xia Ming-hua①; Mo Wu-zhong①; Tang Wen-ming①
①Department of Electronic & Communication Engineering, SUN YAT-SEN University, Guangzhou, 510275, China;②School of Information Engineering, Shenzhen University, Shenzhen 518060, China;③School of Electronics Information Engineering, Sichuan University, Chengdu 610064, China
Abstract：An adaptive multistage beamforming receiver with a low complexity that is suitable for CDMA wireless communication systems is proposed in this paper. The receiver adopts a novel orthogonal multistage structure to achieve the system optimization which is carried out independently at each stage. The system parameters for each stage are obtained through a simple iterative procedure, and a complex weight is set up at each stage. The MMSE optimization criterion is used to compute and update the adaptive weight. The number of stages is determined by signal environments to make the system more flexible. In comparison with other methods, the proposed system provides an improved performance especially in correlated signal environments. In addition, it gives a reduced computational complexity.
2007, Vol. 29 
