Power allocation for mimo-ofdm systems with multi-user decoupling and scheduling

Abstract

This paper presents a power allocation scheme for multi-user multiple-input multiple-output orthogonal frequency division multiplexing (MIMO-OFDM) systems with channel state information (CSI) on transmitter and receiver. In the presented scheme, multi-user power allocation can be decoupled into single user power allocation through null space mapping multi-user channel and power allocation can be performed through spatial-spectral water-filling per user. To deal with increasing number of system users and fading correlation, scheduling can be used to maintain power allocation gain. The proposed scheme has low complexity and can substantially improve system spectral efficiency. Simulation results assess our theoretic analyses.