Improved Double Threshold Energy Detection for Cooperative Spectrum Sensing in Cognitive Radio

Sanket S. Kalamkar; Adrish Banerjee

doi:10.14429/dsj.63.3761

Sanket S. Kalamkar Indian Institute of Technology Kanpur, Kanpur
Adrish Banerjee Indian Institute of Technology Kanpur, Kanpur

DOI: https://doi.org/10.14429/dsj.63.3761

Keywords: Cooperative spectrum sensing, Improved energy detector, Double threshold detector, Imperfect reporting channel, Total error rate

Abstract

In this paper, we focus on cooperative spectrum sensing (CSS) for double threshold improved energy detector. In this method, the improved energy detector compares positive power operation p of the amplitude of received signals at each secondary user (SU) with two thresholds to make binary decision about presence or absence of primary user (PU). The energies lying between upper and lower threshold are considered unreliable and are not considered in cooperation. The decisions are forwarded over an imperfect reporting channel to a fusion center where final decision on presence or absence of PU is taken. We combine double threshold approach with improved energy detection. Two step optimization is performed where cooperative probability of detection is maximized as a function of threshold difference in double threshold and then highest value of maximized cooperative probability of detectionis found as a function of power operation p, average signal-to-noise ratio at SUs, number of cooperating SUs and cooperative probability of false alarm. Also, we find the optimum fusion rule at fusion center along with optimum power corresponding p to the lowest value of the minimized total error rate using two step optimization. Then weanalyse the effect of errors introduced in reported decisions due to imperfect reporting channel.

Defence Science Journal, 2013, 63(1), pp.34-40, DOI:http://dx.doi.org/10.14429/dsj.63.3761

Author Biographies

Sanket S. Kalamkar, Indian Institute of Technology Kanpur, Kanpur

Mr Sanket S. Kalamkar received his BTech from College of Engineering Pune, Pune, India, in 2009. He is presently working towards his PhD at Electrical Department, Indian Institute of Technology Kanpur, Kanpur, India. His research interests include: cognitive radio networks, wireless communications and coding theory.

Adrish Banerjee, Indian Institute of Technology Kanpur, Kanpur

Dr Adrish Banerjee received his BTech from Indian Institute of Technology, Kharagpur, and MTech and PhD from University of Notre Dame, Indiana. He is currently an Associate Professor in the Department of Electrical Engineering at Indian Institute of Technology, Kanpur. He is a recipient of Microsoft Research India young faculty award, and Institute of Engineers India young engineer award. His research interests include: Physical layer aspects of wireless communications, particularly error control coding, cognitive radio and OFDM systems.