Performance of a Reduced Feedback OFDMA System Employing Joint Scheduling and Diversity

Abstract

We consider joint scheduling and diversity to enhance the benefits of multiuser diversity in a multiuser OFDMA scheduling system. The OFDMA spectrum is assumed to consist of $N_{RB}$ resource blocks and the reduced feedback scheme consists of each user feeding back only the best- $N_{FB}$ signal to noise ratios. Assuming maximum SNR scheduling, we develop a framework to analyze the performance of both adaptive and non-adaptive rate schemes for a general value of $N_{FB}$. Based on this framework, we provide closed-form expressions for the sum rate and the bit error probability when transmit antenna selection is employed at the transmitter and maximal ratio combining is utilized at the receivers.