Transceiver Design to Maximize the Weighted Sum Secrecy Rate in Full-Duplex SWIPT Systems

Abstract

This letter considers secrecy simultaneous wireless information and power transfer (SWIPT) in full duplex systems. In such a system, full duplex capable base station (FD-BS) is designed to transmit data to one downlink user and concurrently receive data from one uplink user, while one idle user harvests the radio-frequency (RF) signals energy to extend its lifetime. Moreover, to prevent eavesdropping, artificial noise (AN) is exploited by FD-BS to degrade the channel of the idle user, as well as to provide energy supply to the idle user. To maximize the sum of downlink secrecy rate and uplink secrecy rate, we jointly optimize the information covariance matrix, AN covariance matrix and receiver vector, under the constraints of the sum transmission power of FD-BS and the minimum harvested energy of the idle user.Since the problem is non-convex, the log-exponential reformulation and sequential parametric convex approximation (SPCA) method are used. Extensive simulation results are provided and demonstrate that our proposed full duplex scheme extremely outperforms the half duplex scheme. Index TermsWireless information and power transfer, physical layer security, full duplex, convex optimization.

Fog-Assisted Multiuser SWIPT Networks: Local Computing or Offloading

“…So far, lots of works on SWIPT or FC can be found in the literature [21]- [38]. For SWIPT, some works investigated the optimal resource allocation including time assignment, transmit power, and energy beamforming vector in various wireless systems [22]- [24], and others focused on the system performance analysis in terms of outage probability [26] and ergodic capacity [27] in fading channels or designed the SWIPT systems with some practical limitations, e.g., imperfect channel state information (CSI) [28], nonlinear EH circuit features [29] and communication secrecy requirements [30]. For FC/MEC, different types of offloading frameworks and policies were presented, see e.g., [31]- [34], and multiobjective optimal resource allocations were studied, see e.g., [35]- [38], to improve system performance in various scenarios.…”

Secure Full-Duplex Two-Way Relaying for SWIPT

“…To name a few, for example, FD SWIPT has been considered in [13]. Also, PHY security in FD systems was addressed in [14], [15]. In contrast to previous work, our main contribution is the study of the integration of all three and the joint optimization of the sources' transmit power, the artificial noise (AN) covariance and the two-way relay beamforming matrix to maximize the secrecy sum-rate for SWIPT with a FD multiple-input multiple-output (MIMO) amplify-and-forward (AF) relay employing power splitter (PS).…”

Secure Beamforming in Full-Duplex SWIPT Systems with Loopback Self-Interference Cancellation

“…Based on the energy carried by the RF signals, SWIPT systems can deliver information signal to the user equipments (UEs) and energy signal to the low energy-consumption energy receivers (ERs) [6]. Hence, the integration of FD technology into the SWIPT systems is promising due to the simultaneous support of UEs and ERs, and the improvement of the spectrum efficiency and the energy efficiency [8]. To avoid the attenuation of the energy signal and meet energy demands, the ERs are usually deployed near the transmitters [9].…”