Abstract:

A user rejection criterion was proposed for the ZFBF based greedy multi-user selection algorithm in MIMO downlink system. As compared to the original algorithm, the improved one which using the user rejection criterion has nearly no performance loss and reduces the number of candidate user set in every selection step significantly. Simulation results show that the user rejection criterion can lower down the computation complexity more than 50% when the signal to noise ratio is relatively small.

Key words: Multi-Input Multi-Output, Zero-Forcing Beamforming, User Rejection Criterion, Multi-User Selection