It is observed that under the AWGN the detection probability for a given value of false alarm has been significantly achieved by optimal value of detection probability in the AND rule as the number of the user increases. Finally we have observed that due to fading condition, AND rule gives better performance in detection probability among three rules. | International Journal of Computer Networks and Communications Security C , , NOVEMBER 2013, 225–231 Available online at: ISSN 2308-9830 N C S Decisive Factors of False Detection on Spectrum Sensing in Cognitive Radio Lailun Nahar1, Sameha Zaman Ruthi2, Fakir Mashuque Alamgir3 and Anwarul Azim4 1, 2, 3, 4 East West University, Department of Electrical & Electronic Engineering, Dhaka, Bangladesh E-mail: 1rifat_eee@, , 3fma@, 4azim@ ABSTRACT The increasing demand of wireless communication introduces efficient spectrum utilization challenges. Cognitive radio has emerged as the key technology to address this challenge which enables opportunistic access to the spectrum. Cooperative spectrum sensing improves the probability of detection by collaborating to detect primary user's signal in cognitive radio (CR) system as well. The goal of this thesis is to cooperate the cognitive users to increase the detection probability for a given probability of false alarm and find out the better condition of sensing spectrum among three rules: AND, Majority, OR. It is observed that under the AWGN the detection probability for a given value of false alarm has been significantly achieved by optimal value of detection probability in the AND rule as the number of the user increases. Finally we have observed that due to fading condition, AND rule gives better performance in detection probability among three rules. Keywords: Cooperative Sensing, Probability of False Alarm, Probability of Miss Detection, AWGN Channel, Fading Condition. 1 INTRODUCTION Cognitive Radio (CR) is an adaptive, intelligent radio and network technology that can automatically detect available channels in a wireless spectrum and change transmission parameters enabling more communications to run concurrently and also can improve radio operating behavior. Cognitive radio networks (from now on called secondary networks) will also need to .
