Researchers in both academia and industry have accepted OFDMA as the most appropriate
air-interface for the emerging broadband wireless access networks and standards. A …

This paper considers a spectrum underlay network, where an OFDM-based cognitive radio
(CR) system is allowed to share the subcarriers of an OFDMA-based primary system for …

This paper considers the downlink of a cellular orthogonal frequency division multi-access
(OFDMA) system, in which multiple base stations (BSs) are coordinated by a centralized …

This paper considers the primary user activity or the subchannel availability in optimally
distributing the available resources for an orthogonal frequency-division multiple-access …

In this paper, we study the coexistence and optimization of a multicell cognitive radio
network (CRN) which is overlaid with a multicell primary radio network (PRN). We propose a …

To improve power efficiency in vehicle-to-roadside infrastructure (V2I) communication
networks, this paper proposes a joint power and sub-carrier assignment policy under delay …

Cognitive Radio (CR) systems have been proposed to increase the spectrum utilization by
opportunistically access the unused spectrum. Multicarrier communication systems are …

We analyze the orthogonal frequency division multiplexing (OFDM) technique in long-haul
next generation optical communication links and compare it with the well-established single …

Multiple antenna orthogonal frequency division multiple access (OFDMA) is a promising
technique for the high downlink capacity in the next generation wireless systems, in which …

Recently, a cooperative paradigm for single-channel cognitive radio networks has been
advocated, where primary users can leverage secondary users to relay their traffic …