volume | PIER Journals

2011-07-19

Determining Optimal Sensing Time for Multi-Radio Multi-Channel Cognitive Radios

Brownson Obaridoa Obele,

Dr. Brownson Obaridoa Obele

School of Information and Communications Engineering

Gwangju Institute of Science and Technology (GIST)

South Korea

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Mohsin Iftikhar

Dr. Mohsin Iftikhar

King Saud University

Saudi Arabia

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Progress In Electromagnetics Research C, Vol. 22, 241-258, 2011

doi:10.2528/PIERC11041207

Abstract

Fast and efficient spectrum sensing is vital for multi-radio multi-channel cognitive radio (CR) networks where unlicensed secondary users (SUs) have to sense and opportunistically transmit on multiple spectrum bands without causing any harmful interference to the licensed primary users (PUs) of those spectrum bands. Accordingly, this paper presents a smart, practical and efficient wideband spectrum sensing scheme based on an optimal sensing stop policy that aims to optimize SU throughput while adhering to the PU interference constraints. Unlike existing work, this scheme is smart because in determining the best time for the multi-transmitter SU to stop sensing and start data transmission based on the channels that have been sensed idle, this scheme explicitly takes into consideration the number of transmitters on the SU; so-called N-transmitters constrained SU. Further, we formulate and solve the optimal sensing stopping problem. The numerical and simulation results presented verify the efficiency of the proposed sensing scheme.

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Brownson Obaridoa Obele, and Mohsin Iftikhar, "Determining Optimal Sensing Time for Multi-Radio Multi-Channel Cognitive Radios," Progress In Electromagnetics Research C, Vol. 22, 241-258, 2011.
doi:10.2528/PIERC11041207

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