CDMA通信中空间滤波和波束赋形的性能

研究了CDMA移动通信系统中基站智能天线阵抗干扰与噪声的性能；推导了上行空间滤波的输出信千比与信噪比，以及下行采用波束赋形时接收天线的输入信千比与信噪比；给出了阵处理相对于单天线的平均信千比增益与信噪比增益估计公式；并分别基于均匀线阵和均匀圆阵，对上行传统空间滤波器和下行传统的波束赋形器的干扰抑制性能进行了数字仿真计算与分析。

Performance of Spatial Filtering and Beamforming in CDMA Communications

Performance of array processing on interference and noise suppression was investigated in this paper, where a smart antenna array was used at the base station of a CDMA communication system. Both the uplink and the downlink were considered. In the uplink, a spatial filter was used at the receiver, and the signal to interference ratio as well as the signal to noise ratio at the output of spatial filter were formulated. When the downlink was considered, the signal to interference ratio as well as the signal to noise ratio at the input of the receive antenna were derived with a beam former used in the transmitter. The performance gained of array processing with respect to using single antenna at the base station was also examined. Simulations with a uniform linear array and a uniform circle array, respectively, were conducted to investigate the performance of a traditional spatial filter in the uplink and a classic beam former in the downlink.