期刊文献+

考虑高斯误差和Doppler扩展的最大比合并性能分析

The Impacts of Gaussian Error and Doppler spread on Maximal-Ratio Combining of Antenna Arrays
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摘要 在高斯误差和Doppler扩展条件下,研究信道估计时公共导频信道相关长度对天线阵的合并性能影响.假设信道估计通过相关WCDMA公共导频信道的N个符号来获得,文章首先推导了相干BPSK解调时平均BER性能的闭解表达式,然后利用该平均BER表达式对导频信道最优相关长度进行了分析,给出了最优相关长度的计算方法,并证明了最优相关长度N只与最大Doppler扩展f和符号周期有关,与阵列参数以及天线接收的信噪比无关. Maximum-ratio combining (MRC) is a simple and effective combining scheme for adaptive antenna arrays to combat fading. However, it requires estimation of the spatial signature ( i. e., the channel gain and phase at each antenna element) of the desired signal across the array. Assuming the channel estimation is obtained by N symbols' correlation using common pilot channel (CPICH), we proceed to develop a fully analytical assessment of the impacts of Gaussian error and Doppler spread on the MRC performance. The originality of the approach revolves around the derivation of the closed-form expression for average bit error probability for coherent BPSK. The expression is then applied to find the optimal correlation length of channel estimation. As a result,the computing method of optimal correlation length has been given. It is also proved that the optimal correlation length N was only correlative with maximal Doppler spread fd and symbol duration.
出处 《电子学报》 EI CAS CSCD 北大核心 2006年第1期24-30,共7页 Acta Electronica Sinica
基金 国家自然科学基金(No.60472052)
关键词 天线阵列 最大比合并 非理想信道估计 高斯误差 Doppler扩展 antenna arrays maximal-ratio combining imperfect channel estimation Gaussian error Doppler spread
作者简介 李汉强 男,1976年生于四川成都,电子科技大学博士,主要研究方向为第三代移动通信空时二维信号处理。E-mail:cnpla@126.com。 郭伟 男,1964年生于四川达川,电子科技大学教授、博士生导师,中国通信学会青年工作委员会副主任委员和多家学术委员会委员,主要研究方向为通信网络技术、网络仿真技术、信号处理技术、通信对抗技术等。 郑辉 男,1957年出生于江苏昆山,信号盲处理国防科技重点实验室博士生导师,主要研究方向为多媒体通信、盲信号处理、移动通信技术。
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