Outdoor to indoor office MIMO measurements at 5.2 GHz

This paper presents the results of one of the first measurement campaigns for the double-directional characterization of outdoor to indoor wireless propagation channels. Such channels play a vital role for cellular systems with multiple antenna elements at transmitter and receiver, i.e. multiple-input multiple-output (MIMO) systems. Measurements were performed at 5.2 GHz between 53 different receiver locations in an office building, and three "base station" positions on a nearby rooftop. In the paper, we present results for angular-delay profiles, RMS angular spread, and other statistical parameters characterizing delay and angular dispersion.