Sensing time and power optimization in MIMO cognitive radio networks

Moghimi F, Mallik RK, Schober R (2012)

Publication Type: Journal article

Publication year: 2012

Journal

IEEE Transactions on Wireless Communications Institute of Electrical and Electronics Engineers (IEEE)

Book Volume: 11

Pages Range: 3398-3408

Article Number: 6276193

Journal Issue: 9

DOI: 10.1109/TWC.2012.081312.112278

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, probability of false alarm, and probability of missed 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 non-convex optimization problems for the optimal choice of the sensing threshold, sensing times, and transmit powers in each spatial subchannel for both single-band and multi-band MIMO CR systems. Since finding the global optimal solution of these problems entails a very high complexity, we develop two iterative algorithms that are based on the concept of alternating optimization and solve only convex subproblems in each iteration. Thus, the complexity of these algorithms is low, and we prove their convergence to a fixed point analytically. Simulation results show that the developed algorithms closely approach the global optimal performance and achieve significant performance gains compared to baseline schemes employing equal powers or equal sensing times in all subchannels. © 2012 IEEE.

Authors with CRIS profile

Robert Schober

Involved external institutions

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

How to cite

APA:

Moghimi, F., Mallik, R.K., & Schober, R. (2012). Sensing time and power optimization in MIMO cognitive radio networks. IEEE Transactions on Wireless Communications, 11(9), 3398-3408. https://doi.org/10.1109/TWC.2012.081312.112278

MLA:

Moghimi, Farzad, Ranjan K. Mallik, and Robert Schober. "Sensing time and power optimization in MIMO cognitive radio networks." IEEE Transactions on Wireless Communications 11.9 (2012): 3398-3408.

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