NDLI: Joint versus separate spectrum sensing and resource allocation in OFDMA-based cognitive radio networks

Content Provider	IET Digital Library
Author	Janatian, Nafiseh Hashemi, Mahmood Modarres Sun, Sumei
Abstract	In this study, the authors investigate the resource allocation issue for sensing-based orthogonal frequency-division multiple access (OFDMA) cognitive radio networks. They consider a network consisting multiple secondary users (SUs) and a secondary base station (BS) implementing a two-phase protocol. In the first phase, cooperative spectrum sensing is carried out to detect the vacant subchannels. In the second phase, SUs transmit data in the uplink to the BS by using OFDMA. They optimise the sensing parameters, transmit power and subchannel assignments jointly to minimise the total energy consumption with the constraints on SUs’ quality of service and detection probability of the primary user. This is a mixed binary integer programming problem which is NP (non-deterministic polynomial-time)-hard and generally intractable. They represent the problem as a bilevel problem and propose two efficient algorithms to solve the slave and master subproblems. They also study the separate optimisation, in which the sensing parameters of SUs are set regardless of the allocated resources. They investigate the energy savings of joint versus separate optimisation using numerical experiments. The results show that the joint optimisation method can introduce up to 16% of energy saving in zero sensing signal-to-noise ratio with the same total transmission bandwidth of 2.5 MHz.
Starting Page	839
Ending Page	847
Page Count	9
ISSN	17518628
Volume Number	10
e-ISSN	17518636
Issue Number	Issue 7, May (2016)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-com/10/7
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-com.2015.0912
Journal	IET Communications
Publisher Date	2016-05-05
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	Bandwidth 1.25 MHz Bandwidth 2.5 MHz Bilevel Optimisation Problem Channel Allocation Cognitive Radio Cognitive Radio Network Computational Complexity Cooperative Communication Energy Consumption Frequency Division Multiple Access Joint Optimisation Method Mixed Binary Integer Programming Problem Modulation And Coding Method Multiple Access Communication NP-hard OFDM Modulation OFDMA Optimisation Optimisation Technique Orthogonal Frequency Division Multiple Access Protocol Quality of Service Radio Link And Equipment Radio Spectrum Management Resource Allocation Secondary Base Station Secondary User Separate Optimisation Signal Detection Signal to Noise Ratio Soft Cooperative Spectrum Sensing SU Sensing Parameter Subchannel Assignment Transmit Power Two-phase Protocol
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering Computer Science Applications

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1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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