WCDMA下行链路AWGN功率估计算法的改进  

Improvement of AWGN Noise Power Estimation Algorithm for WCDMA Downlink

作　　者：杨燕[1] 葛万成[1] 吴更石[2] 彭念[2] 杨靖[2] 

机构地区：[1]同济大学,上海200092 [2]华为公司上海研究所,上海200127

出　　处：《通信技术》2009年第12期191-193,共3页Communications Technology

基　　金：德国罗德与施瓦茨公司资助

摘　　要：均衡器的一个重要参数是AWGN信道的噪声功率,它的准确度会影响均衡器的性能。提出了一种改进的AWGN噪声功率估计方法,该算法利用信道估计模块得到的信道响应信息,从接收的总噪声中减去符号间干扰功率和多用户之间的信号干扰功率,从而准确估计AWGN信道的噪声功率。仿真结果表明,提出的方法能显著提高线性最小均方误差(LMMSE)均衡器的性能,在误码块率(BLER)为8%时,性能约有1dB的改善。The power of AWGN （Additive White Gaussian Noise） is a very important parameter for equalizers, and the performance of equalizers would decline if noise power is not precisely estimated. In this paper, a modified algorithm of AWGN noise power estimation is proposed. The improved algorithm makes use of the results from channel estimation to calculate the interference power of ISI （Inter Symbol Interference） and MUI （Multiple User Interference）, and subtracts the interference power from the total noise power in the receiver, thus a proper noise power of AWGN is obtained. Simulation results indicate that the new method outperforms the former one in LMMSE （Linear Minimum Mean Square Error） equalizers. When BLER equals to 8 percent, there is an improvement by 1 dB.

关 键 词：最小线性均方误差 均衡器 干扰功率 噪声功率估计 

分 类 号：TN911.4[电子电信—通信与信息系统]