江苏大学学报（自然科学版）2013，Vol.34Issue(2)：202-205,221,5.DOI:10.3969/j.issn.1671-7775.2013.02.014
MIMO系统中的迭代时变信道估计
Iterative time-varying channel estimation for MIMO system
摘要
Abstract
In order to improve the channel estimation performance for MIMO systems in time-varying channels, a signal model fitting the framework of expectation maximization (EM) algorithm was established based on the Karhunen-Loeve basis expansion model ( KL-BEM). The channel response was estimated in iterative fashion by EM algorithm. In the estimation scheme, the EM iterations and the orthogonality of KL-BEM basis functions were introduced to improve the estimation performance and reduce the computational complexity, respectively. The simulation results of 2 by 2 MIMO system show that the proposed scheme convergences after 5 iterations and the estimated channel impulse response is nearly consistent with the actual one. The bit error rate (BER) performance by the proposed scheme is near to that of perfect channel knowledge. At high signal to noise ratio region, the difference between them is lower than 1 dB with 2 dB performance enhancement over the least square channel estimator. The proposed scheme has good estimation performance in time-varying channel conditions.关键词
多输入多输出/信道估计/期望最大化算法/时变信道/基扩展模型Key words
multiple input and multiple output/ channel estimation/ expectation maximization algorithm/ time varying channel/ basis expansion model分类
信息技术与安全科学引用本文复制引用
陈东华,赵睿,彭盛亮..MIMO系统中的迭代时变信道估计[J].江苏大学学报（自然科学版）,2013,34(2):202-205,221,5.基金项目
侨办科研基金资助项目(11QZR02) （11QZR02）
福建省自然科学基金资助项目(2012J05119) （2012J05119）
华侨大学科研基金资助项目(12BS230) （12BS230）
广西无线宽带通信与信号处理重点实验室2011年度主任基金资助项目(21104) （21104）
