User Identification for Opportunistic OFDM Based Broadband Wireless Network

Multi-user diversity can be employed in wireless communications to significantly improve system performance by scheduling a channel to the user with the best instantaneous channel condition. Conventional multi-user diversity schemes require all mobile terminals' channel state information to be available at the access point, thereby inducing huge system overhead. In this paper, we propose a user identification approach to significantly reduce system overhead for wireless network with multi-user diversity. The proposed user identification approach is then applied to OFDM systems. We shows that the network throughput upper limit can be significantly improved by using the user identification approach compared with the user polling approach in the literature.