An iterative beamforming and decoding procedure for wireless networks with uncoordinated channel access

摘要

We propose an iterative receiver algorithm to cope with nonstationary cochannel interference, as e.g. arising in wireless ad hoc networks with uncoordinated channel access. The receiver incorporates an adaptive beamforming by a sample matrix inversion (SMI) technique on the information-bearing signals from an array antenna, and an a posteriori probability (APP) computation. The APPs are utilized to successively reconstruct and eliminate the reliably decoded signal parts from the samples. This allows to perform the SMI on a small number of snapshots, for the sake of adaptability, while evading a dramatic performance degradation due to the presence of the signal of interest.