Title: Optimal sensing duration for interweave cognitive radios based on energy efficiency

Authors: Yamuna K. Moorthy; Sakuntala S. Pillai

Addresses: Department of Electronics, Central Polytechnic College, Trivandrum 695013, Kerala, India ' Department of Electronics and Communication Engineering, Mar Baselios College of Engineering and Technology, Trivandrum 695015, Kerala, India

Abstract: Cognitive radios (CR) have emerged as a promising physical layer candidate for 5G and future wireless systems. CR networks use the licensed spectrum when it is not being used by the licensed users. In this paper, we investigate an energy efficiency optimisation problem in interweave or spectrum sensing cognitive systems. The aim is to maximise the energy efficiency by jointly selecting the sensing duration and detection threshold. The joint optimisation problem is a non- convex problem. Therefore, we formulate two sub-problems which are independent and by alternately iterating between the two problems, we can arrive at the optimal value. Simulation results show that the proposed formulation of the optimisation problem and its solution shows energy efficiency gains compared to the existing algorithms. Also, the computational complexity is considerably reduced compared to the optimal method.

Keywords: cognitive radio; energy efficiency; convex optimisation; sensing threshold; detection threshold.

DOI: 10.1504/IJISD.2018.091535

International Journal of Innovation and Sustainable Development, 2018 Vol.12 No.3, pp.350 - 359

Received: 01 Dec 2016
Accepted: 26 Jul 2017
Published online: 04 May 2018 *

Full-text access for editors Full-text access for subscribers Purchase this article Comment on this article