WCDMA中自适应信道估计器的研究

针对WCDMA系统的信道估计器提出了一种新的自适应算法，它的权系数通过瞬时信道估计的自相关函数来自适应更新，从而改变估计器带宽以适应信道时变的多普勒谱．在平坦瑞利衰落信道中的计算机仿其表明，该方法在第3代移动通信标准支持的多普勒频率范围内获得了良好的性能，并且估计的均方误差接近滑动平均滤波器在最佳平均长度下的最小均方误差．

Study on adaptive filter for channel estimation in WCDMA downlink

An adaptive channel estimation filter for WCDMA downlink is presented. The filter coefficients are updated based on the measured autocorrelation function of the instantaneous channel estimate so that the bandwidth of the filter can adjust to changes in the Doppler spectrum of time varying fading channel. The mean square error performance under flat Rayleigh fading channel is evaluated by computer simulation and the results demonstrate that the proposed adaptive channel estimation filter provides good performance which approaches the results of moving average filter under optimal averaging length, over wide Doppler frequency range supported by 3G.