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PHYSICAL-LAYER SECURITY WITH FULL-DUPLEX DECODE-AND-FORWARD RELAYING: SECRECY RATES AND POWER ALLOCATION

Elsaid, Lubna A
http://rave.ohiolink.edu/etdc/view?acc_num=akron1467375632

Abstract Details

2016, Master of Science in Engineering, University of Akron, Electrical Engineering.
This thesis studies the secrecy rate and respective optimal power allocation schemes to maximize the secrecy rate of a full-duplex (FD) relay wiretap channel. The FD relay is assumed to operate in decode-and-forward (DF) mode to support a secured communication from a source to a destination under the presence of an eavesdropper. Both slowly varying fading and ergodic fading channels where the channel gains are assumed to be available at the receivers but not the transmitters are considered. The residual self-interference due to FD transmission is taken into account in formulating the secrecy rate and the optimal power allocation schemes. The first part of the thesis establishes closed-form expressions of the secrecy rates for a given power allocation scheme at the source and the relay. For a slowly varying fading environment, the channel conditions for which a positive secrecy rate is attained are identified. In the case of ergodic fading, we first propose a simple method to calculate the expectation of an exponentially distributed random variable using the exponential integral function. Using this result, the ergodic secrecy rates of the considered FD relay channel are then established in closed-form. The proposed method provides a simple yet effective way to compute the secrecy rates without the need of lengthy Monte Carlo simulations. The second part of the thesis investigates the problem of power allocation between the source and relay to optimize the secrecy rate. For the slowly varying fading channel, Lagrange multipliers are used to establish the optimal power allocation schemes between the source and relay nodes under both individual and joint power constraints. It is then demonstrated that full power at the relay is not necessarily optimal. An asymptotic analysis is then provided to provide important insights on the derived power allocation solutions. Using the method of dominant balance, it is demonstrated that full power at the relay is only optimal when the power at relay is sufficiently smaller compared to that of the source. When the power at the relay is larger than the power at the source, the secrecy rate is insensitive to the power at the relay. Similar results are also obtained over ergodic fading channels. In all cases, numerical results reveal that FD DF relaying provides significantly higher secrecy rate than FD AF relaying.
Nghi Tran, PhD (Advisor)
63 p.
Electrical Engineering

Recommended Citations

Citations

  • Elsaid, L. A. (2016). PHYSICAL-LAYER SECURITY WITH FULL-DUPLEX DECODE-AND-FORWARD RELAYING: SECRECY RATES AND POWER ALLOCATION [Master's thesis, University of Akron]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=akron1467375632

    APA Style (7th edition)

  • Elsaid, Lubna. PHYSICAL-LAYER SECURITY WITH FULL-DUPLEX DECODE-AND-FORWARD RELAYING: SECRECY RATES AND POWER ALLOCATION . 2016. University of Akron, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=akron1467375632.

    MLA Style (8th edition)

  • Elsaid, Lubna. "PHYSICAL-LAYER SECURITY WITH FULL-DUPLEX DECODE-AND-FORWARD RELAYING: SECRECY RATES AND POWER ALLOCATION ." Master's thesis, University of Akron, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=akron1467375632

    Chicago Manual of Style (17th edition)

akron1467375632
719
© 2016, some rights reserved.Creative Commons License PHYSICAL-LAYER SECURITY WITH FULL-DUPLEX DECODE-AND-FORWARD RELAYING: SECRECY RATES AND POWER ALLOCATION by Lubna A Elsaid is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported License. Based on a work at etd.ohiolink.edu.
This open access ETD is published by University of Akron and OhioLINK.