Digital communications: fundamentals and applications
Digital communications: fundamentals and applications
Elements of information theory
Elements of information theory
Wireless Communications
Fundamentals of wireless communication
Fundamentals of wireless communication
Multi-user diversity in a spectrum sharing system
IEEE Transactions on Wireless Communications
Achievable capacity of a spectrum sharing system over hyper fading channels
GLOBECOM'09 Proceedings of the 28th IEEE conference on Global telecommunications
Optimal power allocation for cognitive radio under primary users outage loss constraint
ICC'09 Proceedings of the 2009 IEEE international conference on Communications
Performance analysis of uplink cognitive cellular networks with opportunistic scheduling
IEEE Communications Letters
Efficient Power Allocation for Multiuser Cognitive Radio Networks
Wireless Personal Communications: An International Journal
Performance of Primary Users in Spectrum Sharing Cognitive Radio Environment
Wireless Personal Communications: An International Journal
Impact of Quality of Service Constraints on the Performance of Spectrum Sharing Cognitive Users
Wireless Personal Communications: An International Journal
Impact of Cognitive Communications on the Performance of the Primary Users
Wireless Personal Communications: An International Journal
Switched-Diversity Approach for Cognitive Scheduling
Wireless Personal Communications: An International Journal
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This article investigates a multiuser cognitive environment where secondary users compete to communicate over a channel licensed to a primary user using spectrum sharing. In this environment, both the primary and secondary users transmit to the same receiver unit, and the transmission power of the scheduled secondary user should satisfy the outage probability requirement of the primary user. Secondary users are ranked according to their channel strength, and performance measures are derived as a function of a generic channel rank. Bit error rate, channel capacity, and generated interference are investigated as performance measures. In addition, the performance of the proportional fair, random selection, and round-robin scheduling algorithms are investigated. Numerical results are presented to verify the theoretical analysis and investigate the effects the parameters of the communication environment have on the performance measures and the transmission power of the cognitive users.