A Downlink OFDM Switched-Beam Scheme with Joint Channel Estimation and Beam Selection Based on Kalman Filtering

This article addresses a new topic in OFDM with switched-beam systems, which is the exploitation of the OFDM symbols´ structure to jointly perform the beam selection and channel estimation. Unlike previous works which were based on the symmetry of the channel to select the serving beam from the uplink of a MISO/MIMO system, our approach deals with the MISO downlink where the selection process is controlled at the mobile level. The method is based on the use of Kalman filtering with very spectrum-efficient overlapping pilots to separate the beams.