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中文摘要：
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。
英文摘要：
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.
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