%0 Journal Article
%T Finite-Alphabet and Decision-Feedback Based Channel Estimation for Space-Time Coded OFDM Systems<br>基于有限字符特性的空时OFDM系统决策反馈信道估计
%A Chen Zhi-gang
%A Zhang Tai-yi
%A Gong Zheng-wei
%A <br>陈志刚
%A 张太镒
%A 龚政委
%J 电子与信息学报
%D 2008
%I 
%X A novel blind channel estimation scheme is presented for Space-Time Coded OFDM(STC-OFDM) systems.This scheme is composed of rude channel estimation by exploiting the finite-alphabet property of information signals and fine channel estimation by using decision-directed method,which employs the priori knowledge of the transmitted signals other than the finite-alphabet property of mapping constellation.At the cost of a little more computational complexity,it achieves better performance than the competitive one,hence it is suitable for STC-OFDM systems with a small number of subcarriers in slowly time-varying and not severely frequency selective channels.The scheme is tested with simulations and also compared with the subspace-based channel estimation.
%K Space-Time Coding(STC)
%K Orthogonal Frequency Division Multiplexing(OFDM)
%K Channel estimation
%K Finite-alphabet property
%K Decision-directed method<br>空时编码
%K 正交频分复用
%K 信道估计
%K 字符有限特性
%K 决策反馈
%K 有限
%K 字符
%K 特性
%K OFDM
%K 系统决策
%K 反馈
%K 信道估计算法
%K Systems
%K Channel
%K Estimation
%K 算法性能
%K 比较验证
%K 子空间
%K 子载波数
%K 频率选择性
%K 慢时变
%K 估计精度
%K 盲信道
%K 计算复杂度
%K 方法
%K 采用决策
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=5B3AB970F71A803DEACDC0559115BFCF0A068CD97DD29835&cid=1319827C0C74AAE8D654BEA21B7F54D3&jid=EFC0377B03BD8D0EF4BBB548AC5F739A&aid=43F51E541A7A6639DC1C975B9BFB9C59&yid=67289AFF6305E306&vid=340AC2BF8E7AB4FD&iid=0B39A22176CE99FB&sid=9B95A71E6639C039&eid=B1989ED92BA7E896&journal_id=1009-5896&journal_name=电子与信息学报&referenced_num=0&reference_num=7