A Novel Decision-Directed Channel Estimator for OFDM Systems

摘要：

Existing DD estimators in OFDM systems do not appropriately reduce the influence brought by incorrect decision,and hence suffer from error propagation.In order to mitigate the error propagation in DD channel estimation,a novel DD channel estimator based on recursive linear minimum mean-square error (LMMSE) is proposed.The algorithm takes the error vector of previous channel state information (CSI) estimation as new information for the current CSI estimation,then calculates the desired correction that the new information brings to the current CSI estimation according to the orthogonality principle and corrects the current CSI estimation with this correction term,thereby the effect induced by incorrect decision can be reduced.Analysis and simulation results have shown that the performance of the proposed algorithm is much better than the conventional DD channel estimation,and close to the optimal LMMSE estimator.

关键词： channel estimation training symbols decision-directed recursive LMMSE

作者: Jiankang Zhang Enqing Chen Xiaomin Mu Shouyi Yang

作者单位: Information Engineering School,Zhengzhou University,Zhengzhou 450001

会议类型: 国际会议

会议名称: 9th International Conference on Signal Processing(第九届国际信号处理学术会议)(ICSP08)

会议地点: 北京

会议语种:英文

在线出版日期: 2008-10-26（万方平台首次上网日期，不代表论文的发表时间）