Dynamic Power Allocation Based on SLNR Precoding for Multi-User MIMO Downlink

Abstract

MIMO schemes can improve the capacity observably. The co-channel interference (CCI) and noise are two major impairments to a multi-user MIMO downlink. The precoding based on signal-to-leakage-and-noise ratio (SLNR) makes a balance between eliminating the CCI and the noise, so it improves the system performance. But the channel state of every user is different, the channel quality effects the performance of the system. This paper designs a dynamic power allocation can get a better performance. Simulation results prove the theory at last. We also illustrate that the system performance will degrade when the transmitter knows the imperfect channel state information.