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Subcarrier pairing as channel gain tailoring: Joint resource allocation for relay-assisted secure OFDMA with untrusted users
Indian Inst Technol Jammu, India.
Linköping University, Department of Electrical Engineering, Communication Systems. Linköping University, Faculty of Science & Engineering.
Indian Inst Technol Delhi, India.
2019 (English)In: Physical Communication, ISSN 1874-4907, E-ISSN 1876-3219, Vol. 32, p. 217-230Article in journal (Refereed) Published
Abstract [en]

Joint resource allocation involving optimization of subcarrier allocation, subcarrier pairing (SCP), and power allocation in a cooperative secure orthogonal frequency division multiple access (OFDMA) communication system with untrusted users is considered. Both amplify and forward (AF), and decode and forward (DF) modes of operations are considered with individual power budget constraints for source and relay. After finding optimal subcarrier allocation for an AF relayed system, we prove the joint power allocation as a generalized convex problem, and solve it optimally. Compared to the conventional channel gain matching view, the optimal SCP is emphasized as a novel concept of channel gain tailoring. We prove that the optimal SCP pairs subcarriers such that the variance among the effective channel gains is minimized. For a DF relayed system, we show that depending on the power budgets of source and relay, SCP can either be in a subordinate role where it improves the energy efficiency, or in a main role where it improves the spectral efficiency of the system. In an AF relayed system we confirm that SCP plays a crucial role, and improves the spectral efficiency of the system. The channel gain tailoring property of SCP, various roles of SCP in improving the spectral and energy efficiency of a cooperative communication system are validated with the help of simulation results. (C) 2018 Elsevier B.V. All rights reserved.

Place, publisher, year, edition, pages
ELSEVIER SCIENCE BV , 2019. Vol. 32, p. 217-230
Keywords [en]
Subcarrier allocation; Power control; Cooperative communication; OFDMA; Secure rate maximization
National Category
Telecommunications
Identifiers
URN: urn:nbn:se:liu:diva-154559DOI: 10.1016/j.phycom.2018.11.015ISI: 000458171000021OAI: oai:DiVA.org:liu-154559DiVA, id: diva2:1290511
Note

Funding Agencies|DST-SERB, India [SB/S3/EECE/0248/2014]

Available from: 2019-02-20 Created: 2019-02-20 Last updated: 2019-03-26

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The full text will be freely available from 2020-12-08 10:38
Available from 2020-12-08 10:38

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CiteExportLink to record
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Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • oxford
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
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