Joint Power and Interference Trade-off for Underlay Cognitive Beamforming Technique

Konferenz: European Wireless 2011 - Sustainable Wireless Technologies
27.04.2011 - 29.04.2011 in Vienna, Austria

Tagungsband: European Wireless 2011

Seiten: 5Sprache: EnglischTyp: PDF

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Autoren:
Hou, Jiancao; Ma, Yi; Tafazolli, Rahim (Centre for Communication Systems Research, The University of Surrey, Guildford, UK)

Inhalt:
Underlay cognitive beamforming allows secondary transmitters to suppress interferences to the primary users, whilst maintain their own quality of services. This paper aims at investigating joint power and interference trade-off inherent in the underlay cognitive beamforming scheme. It is shown that the work of interests leads to a non-convex optimization problem, which can be resolved by employing the second-order cone programming. It is theoretically proved that introducing zero-interference to the primary user does not always lead to the system optimality; moreover, we exhibit two conditions, for which the interference should be treated as noise in order to maximize the sum-rate of the considered beamforming system.