Channel parameter estimation using ISIS algorithm in en- vironment with slightly distributed sources

A high resolution channel parameter estimation algorithm has been developed by the professional group "Digital Communications" in collaboration with the company Elektrobit AG, Switzerland. It is named ISIS algorithm where the acronym ISIS stands for "Initialization and Searching Improved Space-alternating generalized expectation maximization" algorithm. In recent publications (Fleury et al., 2002b), (Fleury et al., 2002c) and (Fleury et al., 2003), the ISIS algorithm is proposed for joint estimation of the relative delay, the direction (i.e. azimuth and co-elevation) of departure and the direction of incidence, the Doppler frequency as well as the complex polarization weights of waves propagating from the transmitter (Tx) site to the receiver (Rx) site in mobile radio environments.