Power control in cognitive radio networks: how to cross a multi-lane highway
IEEE Journal on Selected Areas in Communications - Special issue on stochastic geometry and random graphs for the analysis and designof wireless networks
Dynamic spectrum leasing in cognitive radio networks via primary-secondary user power control games
IEEE Transactions on Wireless Communications
Robust cognitive beamforming with bounded channel uncertainties
IEEE Transactions on Signal Processing
IEEE Transactions on Wireless Communications
Comprehensive Capacity Ensured Distributed Binary Power Allocation in Dense Cognitive Networks
Journal of Network and Systems Management
Polarization spectrum sensing scheme for cognitive radios
WiCOM'09 Proceedings of the 5th International Conference on Wireless communications, networking and mobile computing
Robust beamforming in cognitive radio
IEEE Transactions on Wireless Communications
Joint user scheduling and beamforming for underlay cognitive radio systems
APCC'09 Proceedings of the 15th Asia-Pacific conference on Communications
Distributed power control for cognitive user access based on primary link control feedback
INFOCOM'10 Proceedings of the 29th conference on Information communications
Asilomar'09 Proceedings of the 43rd Asilomar conference on Signals, systems and computers
Blind Signal Separation for Cognitive Radio
Journal of Signal Processing Systems
Balancing reliability and utilization in dynamic spectrum access
IEEE/ACM Transactions on Networking (TON)
Power control for cognitive radio networks: axioms, algorithms, and analysis
IEEE/ACM Transactions on Networking (TON)
Wireless Personal Communications: An International Journal
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We consider a secondary usage of spectrum scenario where a secondary network coexists and/or shares the radio spectrum with a primary network to which the spectrum is licensed. The secondary network uses cognitive radio technology to make opportunistic access of the unused and/or underutilized portions of the spectrum. For such a system, we study the problem of joint power control and beamforming with the objective of minimizing the total transmitted power of the cognitive network such that the received interferences at primary users remain below a threshold level as well as the secondary users who are admitted in the system are guaranteed with their signal to interference plus noise ratio (SINR) requirements. Two iterative algorithms, one based on weighted least square (WLS) approach and the other based on admission control for secondary users, are provided to meet the strict interference protection requirement of the primary users. A numerical study is performed to show the convergence behavior of the iterative algorithms.