In this paper, we propose a cluster-based feedback
protocol for multiuser orthogonal frequency-division multipleaccess
(OFDMA) systems, where the capture effect is employed in
each cluster to reduce the enormous system overhead induced by
polling channel-state information. Then, we analyze the system
throughput performance of the proposed feedback protocol.
Compared with the full feedback scheme in the literature,
numerical simulations show that the proposed protocol with
clustered feedback in OFDMA systems achieves higher system
throughput by employing the capture effect with limited feedback
overhead, when the number of users is reasonably large. Moreover,
compared with our previous protocol of Multiuser Diversity
with Capture, the proposed one additionally exploits multiuser
diversity in the frequency domain, thereby achieving better
throughput performance as shown by the simulation results.