Game-Theoretic Power Control Mechanisms for Device-to-Device Communications Underlaying Cellular System

In this paper, a full-duplex NOMA relaying based underlay device-to-device (D2D) communication scheme is proposed, in which D2D transmitter assists cellular downlink transmission as a full-duplex relay. Specifically, D2D transmitter receives signals from base station and transmits the superposition signals to D2D receiver and cellular user in NOMA scheme simultaneously. Furthermore, we investigate the power allocation under the proposed scheme, aiming to maximize D2D link's achievable transmit rate under cellular link's transmit rate constraint and total power constraint. To tackle the power allocation problem, we first propose a power allocation method based on linear fractional programming. In addition, we derive closed-form expressions of the optimal transmit power for base station and D2D transmitter. Simulation results show that the performance of two solutions matches well and the proposed full-duplex NOMA relaying based underlay D2D communication scheme outperforms existing full-duplex relaying based D2D communication scheme.

Section: T C Li B B C Li B T T C a B B T A T C B B T C T C Li B B C Lmentioning

confidence: 99%

“…D2D communications enable two adjacent users can communicate with each other, thus can provide flexible mobile local service, and offload the heavy traffic of base station [3]- [4]. By D2D communication, one mobile user can be directly served by one nearby user who stores his requested contents, instead of by the base station.…”

Section: Introductionmentioning

confidence: 99%

Power allocation for full-duplex NOMA relaying based underlay D2D communications

2019

“…Most of the previous literature [3][4][5][6][7][8][9][10][11][12] is based on the hypothesis of perfect channel state information (CSI). While in practice, CSI is difficult to be perfectly known at each base station (BS) due to the channel estimation and quantization errors.…”

Section: Related Work and Motivationmentioning

confidence: 99%

“…During the past decades, a framework of using PLS to ensure secure communication in dense HCNs has been developed in [3], and security performance without considering interference has been promoted in [4]. On this basis, researchers have designed many methods such as multiple-input multiple-output (MIMO) [5], secrecy beamforming [6], artificial noise (AN) [7], cooperative transmission [8], cooperative jamming [9] and resource allocation [10][11][12] to improve the security performance of wireless systems.…”

Section: Introductionmentioning

confidence: 99%

CoMP Transmission for Safeguarding Dense Heterogeneous Networks with Imperfect CSI

2019

To ensure reliable and secure communication in heterogeneous cellular network (HCN) with imperfect channel state information (CSI), we proposed a coordinated multipoint (CoMP) transmission scheme based on dual-threshold optimization, in which only base stations (BSs) with good channel conditions are selected for transmission. First, we present a candidate BSs formation policy to increase access efficiency, which provides a candidate region of serving BSs. Then, we design a CoMP networking strategy to select serving BSs from the set of candidate BSs, which degrades the influence of channel estimation errors and guarantees qualities of communication links. Finally, we analyze the performance of the proposed scheme, and present a dual-threshold optimization model to further support the performance. Numerical results are presented to verify our theoretical analysis, which draw a conclusion that the CoMP transmission scheme can ensure reliable and secure communication in dense HCNs with imperfect CSI.

“…Radio-frequency (RF) energy harvesting is a technology which can harvest energy from RF signals to power communication devices in energy constrained wireless network, such as Internet of Things (IoT) networks [17] [18], low-power cognitive radio networks [19]- [21], and device-to-device networks [22]- [24]. In particular, simultaneous wireless information and power transfer (SWIPT) is a RF energy harvesting technology that can harvest energy and decode information from the same signal [25] [26].…”

Section: Introductionmentioning

confidence: 99%

Resource allocation in downlink SWIPT-based cooperative NOMA systems

Wang¹,

Xu²

2020

This paper considers a downlink multi-carrier cooperative non-orthogonal multiple access (NOMA) transmission, where no direct link exists between the far user and the base station (BS), and the communication between them only relies on the assist of the near user. Firstly, the BS sends a superimposed signal of the far and the near user to the near user, and then the near user adopts simultaneous wireless information and power transfer (SWIPT) to split the received superimposed signal into two portions for energy harvesting and information decoding respectively. Afterwards, the near user forwards the signal of the far user by utilizing the harvested energy. A minimum data is required to ensure the quality of service (QoS) of the far user. We jointly optimize power allocation, subcarrier allocation, time allocation, the power allocation (PA) coefficient and the power splitting (PS) ratio to maximize the number of data bits received at the near user under the energy causality constraint, the minimum data constraint and the transmission power constraint. The block-coordinate descent method and the Lagrange duality method are used to obtain a suboptimal solution of this optimization problem. In the final simulation results, the superiority of the proposed NOMA scheme is confirmed compared with the benchmark NOMA schemes and the orthogonal multiple access (OMA) scheme.