Downlink beamforming design for cognitive cellular systems

Le, Tuan Anh and Navaie, Keivan (2014) Downlink beamforming design for cognitive cellular systems. In: 2014 IEEE Wireless Communications and Networking Conference (WCNC), 6-9 Apr 2014, Istanbul, Turkey. (doi:10.1109/WCNC.2014.6952318)

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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.

Item Type: Conference or Workshop Item (Paper)
Research Areas: A. > School of Science and Technology > Computer and Communications Engineering
Item ID: 16890
Useful Links:
Depositing User: Tuan Le
Date Deposited: 05 Jun 2015 10:52
Last Modified: 13 Oct 2016 14:35
ISBN: 9781479930838

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