Optimal Spectrum Sensing for Cognitive Radio with Imperfect Detector

Sharma, H and Patel, A and Merchant, S N and Desai, U B (2015) Optimal Spectrum Sensing for Cognitive Radio with Imperfect Detector. In: IEEE 79th Vehicular Technology Conference (VTC Spring), 18-21 May 2014, Seoul.

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Abstract

This paper investigates the sequential opportunistic channel sensing and access problem of an unlicensed or secondary user (SU) in presence of multiple licensed or primary users (PU). The SU senses one channel at a time for the presence of PU. The sensing is considered to be imperfect, i.e, the presence or absence of PU may not be detected correctly. The problem of selection of best channel amongst the sequentially scanned channels for the transmission of SU is modeled as an Optimal Stopping Problem (OSP) which also takes into account the cost of scan per channel. A simple threshold based policy is presented as a solution to OSP in which SU after sensing the channel to be free of PU activity checks the channel quality by comparing the channel gain with a threshold and if the channel gain is more than the threshold then SU selects this channel for transmission. The threshold is seen to be dependent on probabilities of channel occupancy and detection errors. The variation of threshold with respect to detection errors is analyzed and supported with plots. The plots for the variation are presented which match closely with the analytical results.

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IITH Creators:

IITH Creators	ORCiD
Desai, U B	UNSPECIFIED

Item Type:

Conference or Workshop Item (Paper)

Uncontrolled Keywords:

OSP model, channel gain, cognitive radio network, error detection, imperfect detector, optimal spectrum sensing, optimal stopping problem, primary users, secondary user, sequential opportunistic channel sensing, sequentially scanned channelsm,

Subjects:

Others > Electricity
Others > Electronic imaging & Singal processing

Divisions:

Department of Electrical Engineering

Depositing User:

Team Library

Date Deposited:

03 Aug 2015 05:18

Last Modified:

03 Aug 2015 05:18

URI:

http://raiithold.iith.ac.in/id/eprint/1767