宽带CDMA系统中信道估计自适应滤波的研究

A Study on the Adaptive Filter for Channel Estimation in the Wideband CDMA System

在研究了宽带CDMA系统中信道估计均方误差(MSE)的基础上,提出了一种利用信道估计的互相关函数作为系数的有限冲激响应(FIR)滤波器,并比较了它的理论均方误差与维纳滤波器以及滑动平均滤波器之间的大小.在第三代移动通信(3G)支持的多普勒频移范围内的计算机仿真表明:通过自适应算法,验证了所提出的方法在知道噪声方差的情况下都可以获得良好的均方误差性能.

Basing on the study of the mean square error (MSE) of channel estimation in the wideband CDMA system, we proposed a novel adaptive channel estimator by using the cross-correlation of channel estimate as its coefficients. The theoretical MSE performance of the proposed filter, Wiener filter and lowpass filter are also compared in this paper. Computer simulation results show that through adaptive algorithm, the proposed channel estimator can provides good performance over a wide Doppler frequency range supported by 3G, using only noise variance know-(ledge.)