Detection-interference dilemma for spectrum sensing in cognitive radio systems

Dongliang Duan, Liuqing Yang, Jose C. Principe

Research output: Chapter in Book/Report/Conference proceedingConference contribution

2 Scopus citations

Abstract

Cognitive radio technique is proposed as a means of improving the efficiency of current spectrum allocation policy by allowing the unlicensed secondary users (SU) to access the unused spectrum resources (white band) of the licensed primary users (PU). This technique largely relies on the secondary users' capability to detect the unused spectrum band, thus avoiding interference to the primary users. Instead of viewing the spectrum sensing as merely a detection process, in this paper, we analyze the spectrum sensing strategies from the communication perspective, with system capacity and interference as two major system performance metrics. As a result, we then discover the dilemma between PU presence detection and the interference from the SU to the PU caused by the reciprocality of the wireless channel in large-scale fading sense. To solve this dilemma, we propose a new performance criterion called utility loss function to set the threshold in spectrum sensing. Additionally, the cooperation among spectrum sensing users is shown to effectively solve the dilemma.

Original languageEnglish (US)
Title of host publicationMILCOM 2009 - 2009 IEEE Military Communications Conference
DOIs
StatePublished - 2009
Externally publishedYes
Event2009 IEEE Military Communications Conference, MILCOM 2009 - Boston, MA, United States
Duration: Oct 18 2009Oct 21 2009

Publication series

NameProceedings - IEEE Military Communications Conference MILCOM

Other

Other2009 IEEE Military Communications Conference, MILCOM 2009
CountryUnited States
CityBoston, MA
Period10/18/0910/21/09

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