Passive identification of multipath channel

RF transmissions are often done along multipath channel, due to reflections. A physical model of propagating along such a channel is available, and takes into account few parameters as angles of incidence of waves on the array, group delay for each path, Doppler shift, polarization. In order to compensate Rayleigh fading, a spatio-temporal separation of multipaths is proposed. Usually, this is done by transmitting a training sequence (known), which reduces the data rate We show in this paper that a passive identification can be performed, using only received signals. Proposed algorithm proceeds in two steps: the first step is a blind deconvolution, and then a parametric estimation of the channel is performed. Many simulations exhibit performances of proposed algorithms.