High-resolution Bidirection estimation based on the SAGE algorithm: experience gathered from field experiments

Abstract

This contribution reports and discusses results from an experimental investigation of dispersion in delay, direction of departure, and direction of incidence at 2.45 GHz in a typical NLOS pico-cellular environment using the ISI-SAGE (Improved Search and Initialization Space-Alternating Generalized Expectation-Maximization) algorithm presented in [1] and [2]. Most of the estimated waves can be related to the environment under the assumption of one- and two-bounce scattering. The results demonstrate the high potential of the technique for getting a detailed insight into the mechanisms by which the electromagnetic energy propagates between the transmitter and receiver sites. This detailed knowledge is of paramount importance for the development of realistic and accurate models of the radio channel – either for field prediction or for system design – and for MIMO applications. 1