QoS oriented dynamical resource allocation for eigen beamforming MIMO OFDM

Abstract

In this paper, a Quality of Service (QoS) oriented dynamical Subcarrier and bit allocation are proposed for multiuser Spatial multiplexing MIMO OFDMA of FuTURE B3G TDD system in downlink. For the reciprocity of the TDD channel, the channel status information (CSI) can be exploited at the transmitter, and thus the Eigen beamforming spatial multiplexing of MIMO OFDMA can be implemented in TDD system efficiently. Eigen beamforming converts a flat MIMO channel of a subcarrier in OFDM system into a bank of scalar channels without crosstalk from one scalar channel to next, it achieves the capacity of a MIMO channel and attains the full multiplexing gain. With the goal of maximizing the total data rate, subject to the PER, guaranteed bit rate and total power, we develop a new metric for dynamical subcarrier and bit allocation scheme to exploit the multiuser diversity gain further. Simulation results show that the throughput of the system is much higher than the schemes proposed in (4) (5).