Exploiting performance of two-way non-orthogonal multiple access networks: Joint impact of co-channel interference, full-duplex/half-duplex mode and SIC receiver

Multiple access control (MAC) is crucial for devices to send data packets and harvest wireless energy in wireless powered Internet of Things (IoT) networks. A framed slotted ALOHA (FSA) protocol is employed in several practical networks. This paper studies an FSA-based MAC in a centralized wireless powered IoT network, including half-duplex devices and a full-duplex base station transmitting wireless energy in an intended direction. Under such a network, it is possible that a half-duplex device contends for a time slot to transmit a packet while the base station transmits wireless energy to the device in the same time slot, which causes vain charging and wastes the opportunity to charge other devices. To eliminate the vain charging, this paper designs a MAC in which a base station utilizes the information conveyed from devices in advance to arrange the charging order of devices. The novelty is to develop an algorithm to find a charging order of half-duplex devices instead of using full-duplex devices to eliminate the vain charging. Event-driven simulations are conducted to study the performance of the proposed MAC. Simulation results show that the proposed MAC produces better system performances than the system not eliminating the vain charging. In summary, the application of the proposed MAC yields the benefits of higher throughput and lower packet loss.

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Exploiting Impact of Hardware Impairments in NOMA: Adaptive Transmission Mode in FD/HD and Application in Internet-of-Things

Sensors ◽

10.3390/s19061293 ◽

2019 ◽

Vol 19 (6) ◽

pp. 1293 ◽

Cited By ~ 3

Author(s):

Chi-Bao Le ◽

Dinh-Thuan Do ◽

Miroslav Voznak

Keyword(s):

Internet Of Things ◽

Multiple Access ◽

Low Cost ◽

Relay Node ◽

Ergodic Capacity ◽

Adaptive Transmission ◽

Full Duplex ◽

Transmission Strategy ◽

Hardware Impairments ◽

Half Duplex

In this paper, a cooperative non-orthogonal multiple access (NOMA) system is studied for the Internet-of-Things (IoT) in which a master node intends to serve multiple client nodes. The adaptive transmission strategy is proposed at the relay node, i.e., the relay can be half-duplex (HD) and/or full duplex (FD). In practical terms, numerous low-cost devices are deployed in such IoT systems and it exhibits degraded performance due to hardware imperfections. In particular, the effects of hardware impairments in the NOMA users are investigated. Specifically, the closed-form expressions are derived for the outage probability. Moreover, the ergodic capacity is also analysed. This study also comparatively analyzes the orthogonal multiple access (OMA) and NOMA with HD and/or FD relaying. The numerical results are corroborated through Monte Carlo simulations.

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Resource optimization and power allocation in in-band full duplex-enabled non-orthogonal multiple access networks

IEEE Journal on Selected Areas in Communications ◽

10.1109/jsac.2017.2726218 ◽

2017 ◽

Vol 35 (12) ◽

pp. 2860-2873 ◽

Cited By ~ 23

Author(s):

Mohammed S. Elbamby ◽

Mehdi Bennis ◽

Walid Saad ◽

Merouane Debbah ◽

Matti Latva-aho

Keyword(s):

Power Allocation ◽

Multiple Access ◽

Access Networks ◽

Resource Optimization ◽

Full Duplex

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Resource allocation and relay selection in full-duplex cooperative orthogonal frequency division multiple access networks

Computers & Electrical Engineering ◽

10.1016/j.compeleceng.2017.01.019 ◽

2017 ◽

Vol 61 ◽

pp. 223-234

Author(s):

Jafar Banar ◽

S. Mohammad Razavizadeh

Keyword(s):

Resource Allocation ◽

Relay Selection ◽

Multiple Access ◽

Access Networks ◽

Full Duplex ◽

Frequency Division

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Power Efficient Secure Full-Duplex SWIPT Using NOMA and D2D with Imperfect CSI

Sensors ◽

10.3390/s20185395 ◽

2020 ◽

Vol 20 (18) ◽

pp. 5395

Author(s):

Jingpu Wang ◽

Xin Song ◽

Yatao Ma ◽

Zhigang Xie

Keyword(s):

Multiple Access ◽

Full Duplex ◽

Linear Matrix ◽

Artificial Noise ◽

Imperfect Csi ◽

Transmit Power ◽

Power Efficient ◽

Half Duplex ◽

Estimation Scheme ◽

Convergence Performance

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).

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