On Allocation Strategies for Dynamic MIMO-OFDMA with Multi-User Beamforming

This paper considers the impact of different user allocation metrics and strategies on Orthogonal Frequency Division Multiple Access schemes with multi-user beamforming and receive diversity. Here, only a selected subset of all existing users is scheduled on each subcarrier. Thus, if the number of transmit antennas is less than the number of users, user selection is required. Employing strong forward error correcting codes significantly improves the performance of the systems. However, intending to maximize the sum-rate of the system does not automatically yield the best performance in terms of error rates. We analyse the difference of user allocation strategies for uncoded and coded cases with linear beamforming methods and illustrate the performances in terms of perfect and imperfect channel state information.