A novel user scheduling strategy for grouped subcarriers in MIMO-OFDM system

Abstract

In this paper, a reduced complexity algorithm is proposed for grouped subcarriers in multiuser MIMO-OFDM system with generalized beamforming (GBF) scheme. In GBF, user antenna outputs are linearly combined with the receive GBF vector to construct an equivalent multiple input single output (MISO) downlink channel for each subcarrier. The scheduler located at the base station allocates groups of subcarriers to users based on the subchannel gains of these groups. The user with maximum variance of subchannel gains is allowed to select his best group of subcarriers in order to maximize the system weighted sum-rate and fairness among users. The system power is simply uniformly allocated to all the subchannels. A selection of simulation results is presented to illustrate the performance of the proposed algorithm.