Low complexity blind space-time identification of propagation parameters

The radio electrical transmissions often have multiple paths due to reflections on physical objects or due to the inhomogeneity of the propagation medium for example the ionospheric layers in a HF communication. This work presents a new algorithm for the blind estimation of the physical parameters in a multipath channel (direction of arrival, time delay and fading). The results exposed are useful for tactical applications such as HF radio-localization, or for radio communication systems, to combat the degradations due to the channel. The present study is based on the recent work done on blind deconvolution which estimates the channels impulse responses. Based on a physical path parametric model, a spatio-temporal parametric blind identification of the front wave is performed. These parameters are direction of arrival: DOA θ, relative time delay τ and complex gain φ (fading)