Abstract: A novel channel estimation algorithm based on channel shortening for IR-UWBsystem is proposed.Firstly,a new channel shortening equalization is proposed based on minimum shortening channel square error(MSCSE) criterion adapting the received pilot sequence.Then the combined channel is estimated by using the signals that have been equalized by the channel shortening equalization.Finally,the deconvolution is exploited to get the original channel information.Simulations are presented to demonstrate the validity of the algorithm.The mean square error(MSE) of the estimated channel is similar after using the channel shortening equalization when the channel duration isn't longer than the symbol interval.If the channel duration is longer,there is at least 4.3 dBimprovement in MSEperformance by adopting channel shortening equalization.