Abstract
This paper studies secrecy transmission with the aid of a group of wireless energy harvesting-enabled amplify-and-forward (AF) relays performing cooperative jamming (CJ) and relaying. The source node in the network does simultaneous wireless information and power transfer with each relay employing a power splitting receiver in the first phase; each relay further divides its harvested power for forwarding the received signal and generating artificial noise for jamming the eavesdroppers in the second transmission phase. In the centralized case with global channel state information (CSI), we provide the closed-form expressions for the optimal and/or suboptimal AF-relay beamforming vectors to maximize the achievable secrecy rate subject to individual power constraints of the relays, using the technique of semidefinite relaxation (SDR), which is proved to be tight. A fully distributed algorithm utilizing only local CSI at each relay is also proposed as a performance benchmark. Simulation results validate the effectiveness of the proposed multi-AF relaying with CJ over other suboptimal designs.
Highlights
W IRELESS powered communication network has arisen as a new system with stable and self-sustainable power supplies in shaping future-generation wireless communications [1], [2]
The enabling technology, known as simultaneous wireless information and power transfer (SWIPT), has drawn an upsurge of interests owing to the far-field electromagnetic power carried by Manuscript received November 26, 2016; revised April 16, 2016 and July 13, 2016; accepted September 3, 2016
To demonstrate the effectiveness of our artificial noise (AN)-aided secure multi-AF relay beamforming algorithms, we provide three benchmark schemes: NoCJ-static power splitting (SPS), NoCJ-dynamic power splitting (DPS) and Random PS.5
Summary
W IRELESS powered communication network has arisen as a new system with stable and self-sustainable power supplies in shaping future-generation wireless communications [1], [2]. The enabling technology, known as simultaneous wireless information and power transfer (SWIPT), has drawn an upsurge of interests owing to the far-field electromagnetic power carried by Manuscript received November 26, 2016; revised April 16, 2016 and July 13, 2016; accepted September 3, 2016. Date of publication September 15, 2016; date of current version December 8, 2016. This paper was presented at the IEEE Conference on Communications, London, U.K., June 2015. The associate editor coordinating the review of this paper and approving it for publication was M.
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