MB-OFDM UWB系统中基于信道缩短的信道估计  

Channel Estimation for MB-OFDM UWB Systems Based on Channel Shortening

作　　者：罗颖光[1] 彭兴东 刘郁林[1] 王国鹏[1] 

机构地区：[1]重庆通信学院DSP研究室,重庆400035 [2]中国电子系统工程公司,北京100840

出　　处：《电讯技术》2008年第11期10-14,共5页Telecommunication Engineering

基　　金：国家自然科学基金资助项目(60672157,60672158);重庆市自然科学基金资助项目(CSTC2005BB4219)

摘　　要：在MB-OFDM超宽带(UWB)系统中,针对循环前缀(CP)长度小于信道最大多径延迟时难于估计信道参数的问题,提出一种基于信道缩短的信道估计方法。首先采用发送信号插入梳状导频的方式,利用无约束最优准则,在接收机前端设计信道缩短均衡器,然后根据均衡器输出序列估计出复合信道,最后通过反卷积解出原信道参数。仿真结果表明,在信道最大多径延迟大于CP长度时,该算法具有更优的性能。In view of original channel can not be easily estimated when the length of CP is shorter than that of channel, a novel channel estimation algorithm based on channel shortening is proposed for MB - OFDM UWB systems. First, by inserting comb pilot signals into transmitting signals, a channel shortening equalizer using unconstrained optimization is designed in front of the receiver. Then, the combined channel is estimated using the received signals of shortening equalizer. Finally, the original channel can be estimated by deconvolution. Simulation results demonstrate the algoritnm has better performance, when the length of channel is longer than that of CP.

关 键 词：超宽带通信 正交频分复用 信道估计 信道缩短 

分 类 号：TN911.5[电子电信—通信与信息系统]