基于均匀圆阵的低运算量时空二维Rake接收机实现方法

本文通过引入阵列天线，将传统的1－D Rake接收机推广到了时空域。在均匀圆阵条件下，提出了一种时空二维搜索和跟踪算法，避免了耗时的信号来波方向（DOA）的估计；采用一种适用于CDMA系统的与数据无关的空域滤波器，降低了进行空域滤波器优化的运算量。与基于最优空域滤波器的方法相比，在用户数较大时，本文方法抑制干扰和噪声的能力逼近空域优化方法，而其运算量小于空域优化方法。与具有相当运算量的波束切换方法相比，由于本文中的时空跟踪器能使波束的主瓣始终对准用户来波方向，其抑制干扰和噪声的性能优于波束切换方法。本文最后以数值仿真实验验证了上述结论。

A low computation space-time Rake receiver with uniform circular array

The conventional 1-D Rake receiver is extended to space-time domain by utilizing antenna array in this paper. A space-time searching and tracking algorithm based on uniform circular array is presented, in which the time-consuming DOA estimation is avoided. A data-independent spatial filter suitable for CDMA system is adopted and therefore the benefit of low computation is achieved. The proposed algorithm approximate to optimal-spatial-filter-based one when the interference signal number is more then the number of array elements and has the advantage of and lower computation. As the beamformer main lobe can aim at the look direction of desired user all the time, the proposed method is superior than the switched beam method in terms of interference and noise suppressing performance. Finally, numeral simulations are presented.