WCDMA系统中空时2D-RAKE接收机性能分析

分析了在WCDMA系统的基站中采用含智能天线的空时2D-RAKE接收机的结构和性能.在建立了WCDMA信道、信号模型的基础上,给出了输出误码率的表达式.提出了一种新的利用两个连续时隙的导频符号估计出的信道参数进行加权最小二乘意义下二次曲线内插的信道参数估计方法(WLS).仿真结果表明:WLS算法能很好地跟踪多径衰落信道的变化,提出的空时2D RAKE接收机的误码性能大大改善,而且在移动台移动速度较高时仍能正常工作.

Space-time 2D RAKE receiver performance analysis in WCDMA system

The performance of space-time 2D RAKE receiver at base stations of WCDMA system with a smart antenna is analyzed. Based on the models of WCDMA unlink channel and signal, the expression of output bit error rate (BER) is derived. A novel channel parameter estimation method based on weighed least square (WLS) is presented in this paper. This method employs the instantaneously estimated channel parameter of two neighboring slot pilots to interpolate on a second order curse based on weighed least square, and then channel parameter of data can be attained. The simulation results reveal that WLS method can track and estimate channel, space-time 2D RAKE receiver with WLS method given in this paper can decrease greatly bit error rate and work well even in the case of high mobile speed. The calculation of WLS method is not so complex that it can estimate channel real-timely, and be implemented easily in practice.