Transmit Antenna Selection in Underlay Cognitive Radio Environment
Muhammad Hanif, Hong-Chuan Yang, and Mohamed-Slim Alouini

TL;DR
This paper proposes a transmit antenna selection scheme for underlay cognitive radio systems that maintains interference below a threshold, deriving key performance metrics and validating results through simulations.
Contribution
It introduces a novel antenna selection method ensuring interference constraints in underlay CR, with analytical expressions for performance metrics.
Findings
Closed-form outage probability expressions
Derivation of ergodic capacity formulas
Simulation results confirming analytical analysis
Abstract
Cognitive radio (CR) technology addresses the problem of spectrum under-utilization. In underlay CR mode, the secondary users are allowed to communicate provided that their transmission is not detrimental to primary user communication. Transmit antenna selection is one of the low-complexity methods to increase the capacity of wireless communication systems. In this article, we propose and analyze the performance benefit of a transmit antenna selection scheme for underlay secondary system that ensures the instantaneous interference caused by the secondary transmitter to the primary receiver is below a predetermined level. Closed-form expressions of the outage probability, amount of fading, and ergodic capacity for the secondary network are derived. Monte-carlo simulations are also carried out to confirm various mathematical results presented in this article.
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Taxonomy
TopicsCognitive Radio Networks and Spectrum Sensing · Advanced MIMO Systems Optimization · Wireless Communication Networks Research
