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We consider a system where a licensed radio spectrum is shared by two networks, namely the primary network and the secondary network. The spectrum is licensed to the primary network, however the secondary network makes opportunistic access of the unused and/or underutilized portions of it by using cognitive radio technology. For such a system, we study the problem of joint power control and beamforming...
A cognitive radio network is often described as a secondary communication network operating in a frequency band originally allocated to a primary network consisting of one or multiple primary users. A fundamental challenge for realizing such a system is to ensure the quality of service of the primary users as well as to maximize the throughput of the secondary users. In this paper, we consider a sum-rate...
In this paper, we propose an algorithm, namely, beam synthesis (BES) method for updating the beamforming weights from one TV channel to another TV band in cognitive radio based wireless regional area network (WRAN) communications systems. The proposed BES method tries to constrain not only the same null positions, but also the same main beam positions for different TV channels. The proposed method...
We consider a cognitive radio network in which a set of base stations make opportunistic unlicensed spectrum access to transmit data to their subscribers. As the spectrum of interest is licensed to another (primary) network, power and channel allocation must be carried out within the cognitive radio network so that no excessive interference is caused to any primary user. For such a cognitive network,...
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