We study the resource-allocation problem in a multiuser orthogonal frequency-division
multiplexing (OFDM)-based cognitive radio (CR) system using a cross-layer approach. The …

To achieve a successful broadband wireless access solution, the IEEE 802.16
subcommittee has released a series of standards for WiMAX (worldwide interoperability for …

Cognitive Radio Networks (CRNs) have recently emerged as a promising technology to
improve spectrum utilization by allowing secondary users to dynamically access idle primary …

We consider a multiuser OFDM system in which users want to transmit videos via a base
station. The base station knows the channel state information (CSI) as well as the rate …

This work addresses the fundamental problem of the trade-off between resource efficiency
and user fairness in wireless networks that use opportunistic radio resource allocation. The …

In this paper, a grouping-based uplink orthogonal frequency division multiple access
(OFDMA) random access method is studied which can improve users' satisfaction in the next …

We investigate the cross-layer design for the packet scheduling and resource allocation in
the orthogonal frequency division multiple access (OFDMA) wireless networks. Our focus is …

Cross-layer scheduling is a promising solution for improving the efficiency of emerging
broadband wireless systems. In this tutorial, various cross-layer design approaches are …

This paper presents a number of distributed resource allocation schemes for fixed relay
stations in a network based on orthogonal frequency-division multiple access (OFDMA) …

This paper considers the problem of optimal subcarrier allocation in OFDMA systems to
achieve the minimum outage probability while guaranteeing fairness. The optimal subcarrier …