Abstract
The secure full-duplex (FD) simultaneous wireless information and power transfer (SWIPT) system and non-orthogonal multiple access (NOMA) have been deemed two promising technologies for the next generation of wireless communication. In this paper, the network is combined with device-to-device (D2D) and a practical bounded channel state information (CSI) estimation scheme. A system total transmit power minimization problem is studied and formulated as a multi-objective optimization (MOO) problem via the weighted Tchebycheff approach. A set of linear matrix inequalities (LMI) is used to transform the non-convex form of constraints into the convex form. Considering the imperfect CSI of the potential eavesdropper for robust power allocation, a bounded transmission beamforming vector design along with artificial noise (AN) is used, while satisfying the requirements from the secrecy rates as well as the energy harvesting (EH) task. Numerical simulation results validate the convergence performance and the trade-off between the uplink (UL) and downlink (DL) data transmit power. It is also shown that by FD and NOMA, the performance of the proposed algorithm is higher than that of half-duplex (HD) and orthogonal multiple access (OMA).
Highlights
Next-generation communication systems require self-sustainability wireless nodes to maintain a high data rates network and guarantee quality of service (QoS) [1]
We consider D2D-aided FD non-orthogonal multiple access (NOMA)-enhanced secure simultaneous wireless information and power transfer (SWIPT) communications with imperfect channel state information (CSI), in which D2D receivers can reuse the same subcarrier occupied by the information transmit user to improve the spectrum utilization in the power domain NOMA
We focus on a secure NOMA-based SWIPT UL and DL scenario in a heterogeneous network, as shown in Figure 1, which requires a D2D group communication including one D2D transmitter (DT) and two D2D receivers (DR)
Summary
Next-generation communication systems require self-sustainability wireless nodes to maintain a high data rates network and guarantee quality of service (QoS) [1]. FD NOMA communication is more susceptible to eavesdropping compared to conventional half-duplex (HD) OMA This situation causes extra energy consumption in SWIPT. In SWIPT systems, the secure communication problem is severer because of larger power consumption in the energy harvesting (EH) task [13]. We consider D2D-aided FD NOMA-enhanced secure SWIPT communications with imperfect CSI, in which D2D receivers can reuse the same subcarrier occupied by the information transmit user to improve the spectrum utilization in the power domain NOMA. To the best of our knowledge, the existing works cannot use a power efficiency algorithm in secure NOMA- and D2D-enhanced FD SWIPT systems with channel estimation and energy constraints. We propose an algorithm that involves constraints from EH and secure information transmission tasks to jointly extract information and replenish energy.
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