A Two-Stage Approach to Estimate the Angles of Arrival and the Angular Spreads of Locally Scattered Sources

We propose a new two-stage approach to estimate the nominal angles of arrival (AoAs) and the angular spreads (ASs) of multiple locally scattered sources using a uniform linear array (ULA) of sensors. In contrast to earlier works, we consider both long- and short-term channel variations, typically encountered in wireless links. In the first stage, we exploit sources independence to blindly estimate the channel over several data blocks regularly spaced by intervals larger than the coherence time but each, short enough in length, to make time variations negligible within the block duration. We, thereby, decouple the multisource channel parameters estimation problem in hand into parallel and independent single-source channel parameters estimation subproblems. In the second stage, for each spatially scattered source, we process the corresponding sequence of quasi-independent channel realization estimates as a new single-scattered-source observation over which we apply Taylor series expansio...

• Type: Journal
• Year: 2008
• Where: TSP
• Authors: Mehrez Souden, Sofiène Affes, Jacob Benesty
• Keywords: Channel Parameters Estimation, Nominal Aoa, Scattered Source, TSP 2008