Antenna Selection with Power Adaptation in Interference-Constrained Cognitive Radios

Sarvendranath, Rimalapudi and Mehta, Neelesh B (2014) Antenna Selection with Power Adaptation in Interference-Constrained Cognitive Radios. In: IEEE TRANSACTIONS ON COMMUNICATIONS, 62 (3). pp. 786-796.

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Abstract

The performance of an underlay cognitive radio (CR) system, which can transmit when the primary is on, is curtailed by tight constraints on the interference it can cause to the primary receiver. Transmit antenna selection (AS) improves the performance of underlay CR by exploiting spatial diversity but with less hardware. However, the selected antenna and its transmit power now both depend on the channel gains to the secondary and primary receivers. We develop a novel Chernoffbound based optimal AS and power adaptation (CBBOASPA) policy that minimizes an upper bound on the symbol error probability (SEP) at the secondary receiver, subject to constraints on the average transmit power and the average interference to the primary. The optimal antenna and its power are presented in an insightful closed form in terms of the channel gains. We then analyze the SEP of CBBOASPA. Extensive benchmarking shows that the SEP of CBBOASPA for both MPSK and MQAM is one to two orders of magnitude lower than several ad hoc AS policies and even optimal AS with on-off power control.

Item Type:	Journal Article
Publication:	IEEE TRANSACTIONS ON COMMUNICATIONS
Publisher:	IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
Additional Information:	copyright for this article belongs to IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 445 HOES LANE, PISCATAWAY, NJ 08855-4141 USA
Keywords:	Cognitive radio; Underlay; Antenna selection; Multiple antennas; Diversity techniques; Fading channels; Symbol error probability; Interference constraint; Power constraint
Department/Centre:	Division of Electrical Sciences > Electrical Communication Engineering
Date Deposited:	03 Jun 2014 08:31
Last Modified:	03 Jun 2014 08:31
URI:	http://eprints.iisc.ac.in/id/eprint/49104

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