Time delay estimation based on adaptive filtering and cepstrum analysis method

In order to strengthen its anti-noise performance when using cepstrum to estimate the multipath time-delay of narrowband signals, a pre-processing method by adaptive Notch filtering and envelop modification is proposed based on the adaptive filtering. This method improves the signal-to-noise ratio (SNR) by adaptive Notch filtering, modifies its envelope and preserves the time-delay information. Simulation results show that this method can improve the SNR effectively and do not destroy the delay component. The channel information can be extracted effectively in combination with the cepstrum method.