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针对多频带超宽带系统,提出一种基于导频序列信道缩短的信道估计方法,解决了循环前缀长度小于信道最大多径延迟时难于估计信道参数的问题。首先在发送信号中插入块状导频,利用最小均方误差准则(MMSE),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。仿真实验表明:该算法具有良好性能。
For multi-band UWB systems, a channel estimation method based on pilot sequence channel shortening is proposed to solve the problem that it is difficult to estimate the channel parameters when the cyclic prefix length is less than the maximum path multipath delay. Firstly, the block pilot is inserted into the transmitted signal, the MMSE is used to design the channel shortened equalizer in the front of the receiver, then the composite channel is estimated based on the equalizer output sequence, and the original channel is solved by deconvolution Channel parameters. Simulation results show that the algorithm has good performance.