Sensing time and power optimization in MIMO cognitive radio networks

Moghimi F, Mallik RK, Schober R (2012)

Publication Type: Conference contribution

Publication year: 2012

Pages Range: 1138-1143

Conference Proceedings Title: GLOBECOM - IEEE Global Telecommunications Conference

Event location: Anaheim, CA US

ISBN: 9781467309219

DOI: 10.1109/GLOCOM.2012.6503266

Abstract

In this paper, we investigate the sensing-throughput tradeoff in multi-antenna cognitive radio (CR) systems. Specifically, we optimize the sensing threshold, sensing time, and transmit power of a multi-input multi-output (MIMO) CR system for maximization of the opportunistic system throughput under transmit power and probability of false alarm and detection constraints. To this end, we propose a new transmission protocol which allows the CR user to simultaneously perform data transmission and spectrum sensing on different spatial subchannels. We formulate a non-convex optimization problem for the optimal choice of the sensing threshold, sensing times, and transmit powers in the different spatial subchannels of MIMO CR systems. Since finding the global optimal solution entails a very high complexity, we develop an efficient iterative algorithm that is based on the concept of alternating optimization and solves only convex subproblems in each iteration. Simulation results show that the developed algorithm closely approaches the global optimal performance and achieves significant performance gains compared to baseline schemes employing equal powers or equal sensing times in all subcannels. © 2012 IEEE.

Authors with CRIS profile

Robert Schober

Involved external institutions

Indian Institute of Technology (IIT), Delhi IN India (IN) University of British Columbia CA Canada (CA)

How to cite

APA:

Moghimi, F., Mallik, R.K., & Schober, R. (2012). Sensing time and power optimization in MIMO cognitive radio networks. In GLOBECOM - IEEE Global Telecommunications Conference (pp. 1138-1143). Anaheim, CA, US.

MLA:

Moghimi, Farzad, Ranjan K. Mallik, and Robert Schober. "Sensing time and power optimization in MIMO cognitive radio networks." Proceedings of the 2012 IEEE Global Communications Conference, GLOBECOM 2012, Anaheim, CA 2012. 1138-1143.

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