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Utility Regions for DF Relay in OFDMA-Based Secure Communication with Untrusted Users
Department of Electrical Engineering, Shiv Nadar University, Uttar Pradesh, India.
Department of Electrical Engineering and Bharti School of Telecom, IIT Delhi, New Delhi, India.ORCID iD: 0000-0002-3225-6495
Department of Electrical Engineering and Bharti School of Telecom, IIT Delhi, New Delhi, India.
2017 (English)In: IEEE Communications Letters, ISSN 1089-7798, E-ISSN 1558-2558, Vol. 21, no 11, p. 2512-2515Article in journal (Refereed) Published
Abstract [en]

This letter investigates the utility of a trusted decode-And-forward relay in OFDMA-based secure communication system with untrusted users. For deciding on the use of relay, we first present optimal subcarrier allocation policies for direct communication (DC) and relayed communication (RC). Next, we identify exclusive RC mode, exclusive DC mode, and mixed (RDC) mode subcarriers which can support both the modes. In RDC mode, we present optimal mode selection policy and a suboptimal strategy independent of power allocation which is asymptotically optimal at both low and high SNRs. Via numerical results we present insights on relay utility regions.

Place, publisher, year, edition, pages
Institute of Electrical and Electronics Engineers (IEEE), 2017. Vol. 21, no 11, p. 2512-2515
Keywords [en]
Antennas; Communication channels (information theory); Frequency division multiple access; Network layers; Network protocols; Orthogonal frequency division multiplexing; Secure communication, Df relays; Indexes; Maximum ratio combining; Mode selection; Physical layer security; Relays; Resource management; secure OFDMA; Security; Sub-carrier allocation, Signal to noise ratio
National Category
Communication Systems Signal Processing Computer and Information Sciences
Identifiers
URN: urn:nbn:se:liu:diva-155746DOI: 10.1109/LCOMM.2017.2730186OAI: oai:DiVA.org:liu-155746DiVA, id: diva2:1299117
Available from: 2019-03-26 Created: 2019-03-26 Last updated: 2019-04-01Bibliographically approved

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Mishra, Deepak

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