Joint Channel Estimation and Data Detection for Space-Time Block Coded System via EM Algorithm

摘要：

Detection and decoding of the space-time coded signals over unknown fading channels is a challenging task. In the paper the expectation-maximization (EM) algorithm according to maximum likelihood (ML) criterion is applied to the problem of joint channel estimation and data detection of space-time block coded system over time-selective fading channels. In order to ensure fast converge of the algorithm, the initial of parameters is carefully chosen by combining the pilot symbols matrix assisted estimation and linear interpolation. At the basis of initialization, a series of iterations of the EM algorithm, in which consists of an estimation phase followed by detection/decoding phase, are utilized to realize the joint estimation and detection/decoding scheme. In decoding phase, linear decoding method is used due to the orthogonality of the space-time block code, thus its computation complexity is greatly reduced. Simulation results show that the scheme works with novel performance.

关键词： MIMO channel estimation Space-time coding EM algorithm

作者: Xiaorong Jing Zheng Xu Zhengzhong Zhou

作者单位: School of communication,UEST of China,Chengdu,Sichuan,P.R.China School of electronic and electrical,East China Jiaotong University,Nanchang,Jiangxi,P.R.China

会议类型: 国际会议

会议名称: 第二届IEEE无线通讯、网络技术暨移动计算国际会议

会议地点: 武汉

会议语种:英文

在线出版日期: 2006-09-01（万方平台首次上网日期，不代表论文的发表时间）