%0 Journal Article
%T Channel Estimation of Rapidly Time-Varying Channels for OFDM Systems<br>快时变环境下OFDM系统中的信道估计
%A Hu Die
%A He Liang-hua
%A Yang Lü
%A -xi
%A <br>胡蝶
%A 何良华
%A 杨绿溪
%J 电子与信息学报
%D 2007
%I 
%X In Orthogonal Frequency-Division Multiplexing (OFDM) systems, how to estimate rapidly time-varying channels exactly is a challenge issue. In this paper, relying on a basis expansion channel model, a channel estimation scheme of rapidly time-varying channels is proposed for OFDM systems. Along with the channel estimation scheme, the optimal pilot sequence and optimal placement of the pilot tones are also derived with respect to the mean square error (MSE) of the channel estimate. It is shown that the optimal pilot sequence consists of some adjacent equipowered and equispaced subsequences, and each of them is constrained by certain phase conditions. Simulation results demonstrate the effectiveness of the proposed channel estimation scheme in rapidly time-varying scenarios and the superiority of using the derived optimal pilot sequences.
%K OFDM
%K Time-varying channel
%K Channel estimation
%K Pilot sequence<br>OFDM
%K 时变信道
%K 信道估计
%K 导频序列
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=5B3AB970F71A803DEACDC0559115BFCF0A068CD97DD29835&cid=1319827C0C74AAE8D654BEA21B7F54D3&jid=EFC0377B03BD8D0EF4BBB548AC5F739A&aid=57F886087E45941A&yid=A732AF04DDA03BB3&vid=771469D9D58C34FF&iid=CA4FD0336C81A37A&sid=A63576421B012172&eid=8477411EEDB08A86&journal_id=1009-5896&journal_name=电子与信息学报&referenced_num=0&reference_num=9