Spectrum Sensing via Energy Detector in Low SNR

Author

Atapattu, Saman ; Tellambura, Chintha ; Jiang, Hai

Author_Institution

Dept. of Electr. & Comput. Eng., Univ. of Alberta, Edmonton, AB, Canada

fYear

2011

fDate

5-9 June 2011

Firstpage

1

Lastpage

5

Abstract

As required in the IEEE 802.22 proposal, spectrum sensing techniques should be capable enough to sense the primary signal with very low receiver sensitivity such as at -116 dBm. In this paper, the detection performance of an energy detector used for spectrum sensing in cognitive radio networks is investigated under such very low signal-to-noise ratio (SNR) levels. The analysis focuses on the derivation of a closed-form expression for the average missed-detection probability over Rayleigh fading and Nakagami-m fading channels. Subsequently, the detection threshold is optimized for minimizing the total error rate. The analysis is validated by numerical and simulation results. The sensing requirements defined in IEEE 802.22 are also discussed with numerical examples.

Keywords

Nakagami channels; Rayleigh channels; cognitive radio; IEEE 802.22; Nakagami-m fading channels; Rayleigh fading channels; SNR; closed-form expression; cognitive radio networks; energy detector; low SNR; missed-detection probability; signal-to-noise ratio; spectrum sensing; Cognitive radio; Detectors; Error analysis; Rayleigh channels; Signal to noise ratio;

fLanguage

English

Publisher

ieee

Conference_Titel

Communications (ICC), 2011 IEEE International Conference on

Conference_Location

Kyoto

ISSN

1550-3607

Print_ISBN

978-1-61284-232-5

Electronic_ISBN

1550-3607

Type

conf

DOI

10.1109/icc.2011.5963316

Filename

5963316