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Beamforming in coexisting wireless systems with uncertain channel state information

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Publication date18/09/2016
Host publicationVehicular Technology Conference (VTC-Fall), 2016 IEEE 84th
PublisherIEEE
Pages1-5
Number of pages5
ISBN (Electronic)9781509017010
ISBN (Print)9781509017027
Original languageEnglish
Event64th IEEE Vehicular Technology Conference - Montreal
Duration: 25/09/200628/09/2006

Conference

Conference64th IEEE Vehicular Technology Conference
CityMontreal
Period25/09/0628/09/06

Conference

Conference64th IEEE Vehicular Technology Conference
CityMontreal
Period25/09/0628/09/06

Abstract

This paper considers an underlay access strategy for coexisting wireless networks where the secondary system utilizes the primary spectrum to serve its users. We focus on the practical cases where there is uncertainty in the estimation of channel state information (CSI). Here the throughput performance of each system is limited by the interference imposed by the other, resulting in conflicting objectives. We first analyze the fundamental tradeoff between the tolerance interference level at the primary system and the total achievable throughput of the secondary users. We then introduce a beamforming design problem as a multiobjective optimization to minimize the interference imposed on each of the primary users while maximizing the intended signal received at every secondary user, taking into account the CSI uncertainty. We then map the proposed optimization problem to a robust counterpart under the maximum CSI estimation error. The robust counterpart is then transformed into a standard convex semi-definite programming. Simulation results confirm the effectiveness of the proposed scheme against various levels of CSI estimation error. We further show that in the proposed approach, the trade-off in the two systems modelled by Pareto frontier can be engineered by adjusting system parameters. For instance, the simulations show that at the primary system interference thresholds of -10 dBm (-5 dBm) by increasing number of antennas from 4 to 12, the secondary system throughput is increased by 3.3 bits/s/channel-use (5.3 bits/s/channel-use).

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©2016 IEEE. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE.