Evidence Theory based Cooperative Energy Detection under Noise Uncertainty

Sachin Chaudhari, Prakash B. Gohain, Visa Koivunen

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Noise power uncertainty is a major issue in energy-based spectrum sensors. Any uncertainty in the noise power leads to significant reduction in the detection performance of the energy detector and also results in a performance limitation in the form of SNR walls. In this paper, we propose an evidence theory (also called Dempster-Shafer theory (DST)) based cooperative energy detection (CED) for spectrum sensing. The noise variance is modeled as a random variable with a known distribution. The analyzed system model is similar to a distributed parallel detection network where each secondary user (SU) evaluates the energy from its received signal samples and sends it to a fusion center (FC), which makes the final decision. However, in the proposed DST-based method, the SUs sends computed belief-values instead of actual energy value to the FC. The uncertainty in the noise variance is accounted for by discounting the belief values based on the amount of uncertainty associated with each SU. Finally, the discounted belief values are combined using Dempster rule to reach at a global decision. Simulation results indicate that the proposed DST scheme significantly improves the detection probability under low average signal-to-noise ratio(ASNR) compared to the traditional sum fusion rule in the presence of noise uncertainty.
Original languageEnglish
Title of host publication2017 IEEE Global Communications Conference (GLOBECOM)
Place of PublicationSingapore
Number of pages7
ISBN (Electronic)978-1-5090-5019-2
Publication statusPublished - 2017
MoE publication typeA4 Conference publication
EventIEEE Global Communications Conference - Singapore, Singapore
Duration: 4 Dec 20178 Dec 2017

Publication series

NameIEEE Global Communications Conference
ISSN (Print)2334-0983


ConferenceIEEE Global Communications Conference
Abbreviated titleGLOBECOM


  • cognitive radio
  • flexible spectrum use
  • detection theory


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