Channel estimation in the presence of multipath Doppler by means of pseudo-noise sequences

This paper addresses the problem of multipath channel estimation when channel paths are subject to Doppler shifts. The proposed method builds a rough approximation of the signal ambiguity function by means of a filter bank. Each output of the filter bank is deconvolved by means of an MCMC approach, that provides estimates of the path delays. The estimation of amplitudes and Doppler frequencies is then carried out at each detected path delay. The method is able to cope with simultaneous paths subject to distinct Doppler offsets and with interferences occurring among paths. Cramer- Rao Lower Bounds are derived and presented with simulation results.