Performance Analysis of Energy Detection Based Spectrum Sensing with Unknown Primary Signal Arrival Time

• Published in: IEEE transactions on communications Vol. 59; no. 7; pp. 1779 - 1784
• Main Authors: Wu, Jwo-Yuh, Wang, Chih-Hsiang, Wang, Tsang-Yi
• Format: Journal Article
• Language: English
• Published: New York, NY IEEE 01.07.2011; Institute of Electrical and Electronics Engineers
• Subjects: Applied sciences; Bayesian methods; Cognitive radio; Detectors; energy detection; Equipments and installations; Exact sciences and technology; Information, signal and communications theory; Mobile radiocommunication systems; Numerical models; Radiocommunication specific techniques; Radiocommunications; Robustness; Signal and communications theory; Signal representation. Spectral analysis; Signal to noise ratio; Signal, noise; spectrum sensing; Telecommunications; Telecommunications and information theory; Timing; Transmitters. Receivers; Performance evaluation; Mobile radiocommunication; Energy spectrum; Computer simulation; Wireless telecommunication; Transmitter; Cell network; Cognitive radio; Cognitive system; Arrival time; Overlay network; Spectrum analysis; spectrum sensing; energy detection; Numerical simulation; Timing; Signal analysis; Alignment defect; Random variable; Software radio
• ISSN: 0090-6778
• DOI: 10.1109/TCOMM.2011.050211.100146

Spectrum sensing in next-generation wireless cognitive systems, such as overlay femtocell networks, is typically subject to timing misalignment between the primary transmitter and the secondary receiver. In this paper, we investigate the performance of the energy detector (ED) when the arrival time of the primary signal is modeled as a uniform random variable over the observation interval. The exact formula for the detection probability is derived and corroborated via numerical simulation. To further improve the detection performance, we propose a robust ED based on the Bayesian principle. Computer simulation confirms the effectiveness of the Bayesian based solution when compared with the conventional ED.