Title: Performance improvement of energy detector in cognitive radio using SECp diversity combining technique over fading channel

Authors: Rupali Agarwal; Neelam Srivastava; Himanshu Katiyar

Addresses: Department of Electronics and Communication Engineering, Babu Banarasi Das National Institute of Technology and Management, Lucknow, Uttar Pradesh, India ' Department of Electronics and Communication Engineering, Institute of Engineering and Technology, Lucknow, Uttar Pradesh, India ' Department of Electronics Engineering, Rajkiya Engineering College, Sonbhadra, Uttar Pradesh, India

Abstract: In this paper, performance of energy detector is analysed over Rayleigh fading environment using different diversity combining techniques. The channel is considered as Independent and Identically Distributed (IID). The closed form expressions for probability of detection using Switch and Stay Combining (SSC) as well as switch and examine combining using post examining selection (SECp) are derived. The performance is compared using the curves of probability of detection for different Signal to Noise Ratio (SNR). Probability of false alarm versus probability of misdetection curves is also compared. These curves are called complementary Receiver Operating Characteristics (ROC) curves. For dual diversity system, SECp is a modified form of SSC. Unlike SSC, when all the paths are tested and none of them has an acceptable SNR, the SECp combiner selects the path having highest SNR. So energy detector's detection performance in a dual diversity system is improved using SECp which is analysed here.

Keywords: cognitive radio; probability of detection; probability of false alarm; switch and stay combining; switch and examine combining with post examining selection; complementary ROC.

DOI: 10.1504/IJWMC.2020.105706

International Journal of Wireless and Mobile Computing, 2020 Vol.18 No.2, pp.167 - 174

Accepted: 19 Aug 2019
Published online: 09 Mar 2020 *

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