一种低复杂性多级优化智能天线接收机
doi: 10.3724/SP.J.1146.2006.00496
An Adaptive Multistage Beamforming Receiver with a Low Complexity
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摘要: 该文提出了一种适用于无线通信CDMA系统的低复杂性多级优化智能天线接收机的结构与算法。该接收机采用了新颖的正交分级优化方式，每一级的系统参数只需通过简单的循环迭代就可以决定，每一正交级设置一个复加权系数，通过MMSE准则来估算、更新，在各级中独立进行优化。系统级数多少可由信号环境来决定，使系统的运行更为灵活。与其它方法相比，该系统在无线通信环境下，尤其是在有相关性信号存在的情况下，具有更好的性能，而且在系统复杂性方面也有明显的改进。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.
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