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Downlink beamforming design for cognitive cellular systems

Research output: Contribution in Book/Report/Proceedings - With ISBN/ISSNConference contribution/Paper

Published
Publication date04/2014
Host publicationWireless Communications and Networking Conference (WCNC), 2014 IEEE
PublisherIEEE
Pages1188-1193
Number of pages6
Original languageEnglish
Event2014 IEEE Wireless Communications and Networking Conference (WCNC) - Istanbul, Turkey, United Kingdom
Duration: 6/04/20149/04/2014

Conference

Conference2014 IEEE Wireless Communications and Networking Conference (WCNC)
CountryUnited Kingdom
Period6/04/149/04/14

Conference

Conference2014 IEEE Wireless Communications and Networking Conference (WCNC)
CountryUnited Kingdom
Period6/04/149/04/14

Abstract

We propose a novel scheme to design downlink beamforming vectors in a cognitive cellular network which shares radio spectrum with a primary communication system. We formulate an optimization problem which minimizes the cognitive base station transmit power and the induced interference on the primary users and keeps them below predefined system thresholds. This is subject to providing a certain level of signal-to-interference-plus-noise ratio to the secondary users. We propose an iterative algorithm to solve the optimization problem. The convergence of the proposed iterative algorithm is analytically proved. Simulation results verify that the proposed algorithm quickly converges to the optimal solution. Results also indicate that the proposed algorithm guarantees the transmit power and interference constraints. We then compare the proposed scheme with a benchmark system based on the previous methods. Comparisons show significant reduction in the total interference at reasonable cost of the cognitive base station transmit power.