Abstract: A novel blind channel estimation algorithm is proposed for TH-PPM Ultra Wide-Band communications.Firstly,transformed the nonlinear form of the transmit signal into the linear form.Secondly,deduced the relation between the receive signal’s autocorrelation matrix and the channel response,and then proposed a blind channel estimation algorithm based on receive signal’s autocorrelation matrix matching.This algorithm can acquire comparatively good MSE performance.When using the estimated channel parameters to design the receiver,relatively good BER performance can be gained,only 1.5dB large than the BER of ideal channel.