Exploiting Power Adaptation with Transmit Antenna Selection for Interference-Outage Constrained Underlay Spectrum Sharing

Sarvendranath, R and Mehta, NB (2020) Exploiting Power Adaptation with Transmit Antenna Selection for Interference-Outage Constrained Underlay Spectrum Sharing. In: IEEE Transactions on Communications, 68 (1). pp. 480-492.

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Abstract

In underlay spectrum sharing, the interference constraint limits transmissions by the secondary transmitter, which concurrently accesses the spectrum, to protect the primary user from excessive interference. Transmit antenna selection enables a secondary user to overcome the limitations imposed by the interference constraint using low-complexity hardware. We develop an optimal and novel joint antenna selection and power adaptation rule that minimizes the average symbol error probability (SEP) of a secondary user that is subject to two practically well-motivated constraints. The first is the less-studied but general interference-outage constraint, which limits the probability that the interference power at the primary receiver exceeds a threshold. The second constraint limits the peak transmit power of the secondary transmitter. We show that the optimal rule for the interference-outage constraint has a novel structure that is markedly different from the rules considered in the literature. We then present an insightful geometric interpretation of its structure. Using this, we also propose a practically amenable and near-optimal variant of the optimal rule called the linear rule, and analyze its performance. Our numerical results show that the optimal rule reduces the average SEP by one to two orders of magnitude compared to the rules in the literature.

Item Type:	Journal Article
Publication:	IEEE Transactions on Communications
Publisher:	IEEE
Additional Information:	Copyright of this article belongs to IEEE
Keywords:	Antennas; Transmitters, Antenna selection; Interference constraints; Power adaptation; Spectrum sharing; Symbol error probabilities (SEP); Transmit antenna selection; underlay; Underlay spectrum sharing, Outages
Department/Centre:	Division of Electrical Sciences > Electrical Communication Engineering
Date Deposited:	02 Mar 2020 11:32
Last Modified:	02 Mar 2020 11:32
URI:	http://eprints.iisc.ac.in/id/eprint/64526

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