%0 Journal Article
%T A Low Cost Direct Channel Feedback Method in OFDMA Systems<br>OFDMA框架下一种低代价直接信道信息反馈方法
%A Xu Dao-feng Huang Yong-ming Yang L u-xi
%A <br>许道峰
%A 黄永明
%A 杨绿溪
%J 电子与信息学报
%D 2008
%I 
%X A low cost, real-time CSI feedback method is proposed. The analog DownLink Channel State Information (DL-CSI) obtained at receivers is spreaded and then superimposed upon UpLink User Sequences (UL-US) before transmitting, thus avoiding DL-CSI from exclusive occupation of system resources. Using interference cancellation, iterative UL-US detection and DL-CSI estimation is carried out at base station. Due to spreading, DL-CSI can be accurately recovered even with little allocated energy. Simulations results demonstrate the practicability of the proposed method.
%K OFDMA
%K Multiuser
%K Feedback
%K Downlink CSI
%K FDD<br>正交频分多址
%K 多用户
%K 反馈
%K 下行信道信息
%K 频分双工
%K OFDMA
%K 框架
%K 低代价
%K 下行信道
%K 信息反馈
%K 方法
%K Systems
%K Method
%K Feedback
%K Channel
%K Direct
%K 有效性
%K 验证
%K 仿真
%K 可靠恢复
%K 能量
%K 信息分配
%K 处理
%K 估计
%K 序列检测
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=5B3AB970F71A803DEACDC0559115BFCF0A068CD97DD29835&cid=1319827C0C74AAE8D654BEA21B7F54D3&jid=EFC0377B03BD8D0EF4BBB548AC5F739A&aid=23286F7EFF5715742101193814EF462B&yid=67289AFF6305E306&vid=340AC2BF8E7AB4FD&iid=B31275AF3241DB2D&sid=113224FCB0E3054C&eid=0FA5E3FF9DF9A6BA&journal_id=1009-5896&journal_name=电子与信息学报&referenced_num=0&reference_num=7