A fundamental problem for Cognitive Radios (CR) is spectrum sensing, secondary users need to reliably detect weak primary signals of possibly different types over a targeted wide frequency band in order to identify spectral holes for opportunistic communications. In this paper energy detection technique based on Neyman-Pearson criterion is implemented to detect the presence of deterministic primary user (PU) signals in the channel. We designed a hardware implementable energy detector on a wireless testbed software defined radio (SDR) using USRP2 and an experimental study is carried out to measure the required SNR to achieve the desired probability of detection and false alarm. A comparative study was also made between the SNRs obtained from frequency and time domain analysis. © 2012 IEEE.

P Rajalakshmi

Department of Electrical Engineering

G.V. Chaitanya

Indian Institute of Technology Hyderabad (IITH) is a premier institute of science and technology established in 2008. IITH has been consistently ranked in the&nbsp;<a href="https://iith.ac.in/reports/" rel="noopener noreferrer">top 10 institutes</a>&nbsp;in India for Engineering&nbsp;<a href="https://www.nirfindia.org/2021/EngineeringRanking.html" rel="noopener noreferrer" target="_blank">according to NIRF</a>&nbsp;making it one of the most coveted schools for science and technology in the country.

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