Iterative receivers for SFBC-OFDM systems with adaptive training scheme

作     者：井雅 徐晓东 陈明 程时昕 JING Ya;Xu Xiaodong;Chen Ming;Cheng Shixin

作者机构：东南大学移动通信国家重点实验室南京210096 

出 版 物：《Journal of Southeast University(English Edition)》 (东南大学学报（英文版）)

年 卷 期：2005年第21卷第2期

页      面：127-131页

核心收录：

学科分类：11[军事学] 0810[工学-信息与通信工程] 1105[军事学-军队指挥学] 08[工学] 081002[工学-信号与信息处理] 110503[军事学-军事通信学] 

基　　金：TheNationalHighTechnologyResearchandDevelopmentProgramofChina(863Program) (No. 2002AA123031) 

主　　题：space-frequency block-coded orthogonal frequency division multiplexing(SFBC-OFDM) iterative receiver channel estimation adaptive training scheme 

摘      要：This paper considers the design of iterative receivers for space-frequencyblock-coded orthogonal frequency division multiplexing (SFBC-OFDM) systems in unknown wirelessdispersive fading channels. An iterative joint channel estimation and symbol detection algorithm isderived. In the algorithm, the channel estimator performs alternately in two modes. During thetraining mode, the channel state information (CSI) is obtained by a discrete-Fourier-transform-basedchannel estimator and the noise variance and covariance matrix of the channel response is estimatedby the proposed method. In the data transmission mode, the CSI and transmitted data is obtainediteratively. In order to suppress the error propagation caused by a random error in identifyingsymbols, a simple error propagation detection criterion is proposed and an adaptive training schemeis applied to suppress the error propagation. Both theoretical analysis and simulation results showthat this algorithm gives better bit-error-rate performance and saves the overhead of OFDM systems.