Energy-Efficient Full-Duplex Cooperative Nonorthogonal Multiple Access

Wei, Zhongxiang; Zhu, Xu; Sun, Sumei; Wang, Jingjing; Hanzo, Lajos

doi:10.1109/tvt.2018.2864545

Cited by 37 publications

(28 citation statements)

References 17 publications

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“…Note that an EE maximization problem that involves both SE and power consumption can be handled by quasi-concave optimization. That is, one can transform the fractional structure into a more tractable difference structure, which can be solved by standard convex optimization approaches [47] [48]. As seen, the proposed A-FR obtains the highest EE while the TS-FR is the least efficient solution among the algorithms.…”

Section: Numerical Resultsmentioning

confidence: 99%

Resource Allocation for Wireless-Powered Full-Duplex Relaying Systems With Nonlinear Energy Harvesting Efficiency

Wei

Sun

Zhu

et al. 2019

IEEE Trans. Veh. Technol.

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In wireless power transfer (WPT)-assisted relaying systems, spectral efficiency (SE) of source-relay link plays a dominant role in system SE performance due to the limited transmission power at the WPT-aided relay. In this paper, we propose a novel protocol for a downlink orthogonal frequency division multiple access (OFDMA) system with a WPT-aided relay operating in full-duplex (FD) decode-and-forward (DF) mode, where the time slot durations of the source-relay and relayusers hops are designed to be dynamic, to enhance the utilization of degrees of freedom and hence the system SE. In particular, a multiple-input and signal-output (MISO) source-relay channel is considered to satisfy the stringent sensitivity of the energy harvesting (EH) circuit at the relay, while a single-input and single-output (SISO) relay-user channel is considered to alleviate the power consumption at the relay node. Taking into account the non-linearity of EH efficiency, a near-optimal iteration-based dynamic WPT-aided FD relaying (A-FR) algorithm is developed by jointly optimizing the time slot durations, subcarriers, and transmission power at the source and the relay. Furthermore, self-interference generated at the relay is utilized as a vital energy source rather than being canceled, which increases substantially the total energy harvested at the FD relay. We also reveal some implicit characteristics of the considered WPT-aided FD relaying system through intensive discussions. Simulation results confirm that the proposed A-FR achieves a significant enhancement in terms of SE with different relay's locations and the number of users, compared to the conventional symmetric WPT-aided FD relaying (S-FR) and the time-switching-based WPT-aided FD relaying (TS-FR) benchmarks.

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Section: Numerical Resultsmentioning

confidence: 99%

Resource Allocation for Wireless-Powered Full-Duplex Relaying Systems With Nonlinear Energy Harvesting Efficiency

Wei

Sun

Zhu

et al. 2019

IEEE Trans. Veh. Technol.

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“…In the relay phase, User 1 transmits the block of decoded signal to User 2 while BS keeps silent. We assume that the channel is static within each block [25] and all the channel information is perfectly known at BS, Users 1 and 2 [12,20]. The channel coefficient between BS and User i is denoted as h i (i = 1, 2) and the channel coefficient between Users 1 and 2 is denoted as h 12 .…”

Section: System Modelmentioning

confidence: 99%

Cooperative Asynchronous Non-Orthogonal Multiple Access With Power Minimization Under QoS Constraints

Zou

Ganji

Jafarkhani

2020

IEEE Trans. Wireless Commun.

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Recent studies have demonstrated the superiority of non-orthogonal multiple access (NOMA) over orthogonal multiple access (OMA) in cooperative communication networks. In this paper, we propose a novel half-duplex cooperative asynchronous NOMA (C-ANOMA) framework with user relaying, where a timing mismatch is intentionally added in the broadcast signal. We derive the expressions for the individual throughputs of the strong user (acts as relay) which employs the block-wise successive interference cancellation (SIC) and the weak user which combines the symbol-asynchronous signal with the interference-free signal. We analytically prove that in the C-ANOMA systems with a sufficiently large frame length, the strong user attains the same throughput to decode its own message while both users can achieve a higher throughput to decode the weak user's message compared with those in the cooperative NOMA (C-NOMA) systems. Besides, we obtain the optimal timing mismatch when the frame length goes to infinity. Furthermore, to exploit the trade-off between the power consumption of base station and that of the relay user, we solve a weighted sum power minimization problem under quality of services (QoS) constraints. Numerical results show that the C-ANOMA system can consume less power compared with the C-NOMA system to satisfy the same QoS requirements. Index TermsNon-orthogonal multiple access, asynchronous transmission, cooperative communication, interference cancellation, power control.Non-orthogonal multiple access (NOMA) has been regarded as one of the key technologies for the next generation wireless communications [1]. Compared with the conventional orthogonal multiple access (OMA), NOMA can provide massive connectivity and high spectral efficiency [2].The key rationale behind NOMA is to allow users to share non-orthogonal wireless resources, e.g., frequency, time, and code. For multiuser detection, the superposition coding and the successive interference cancellation (SIC) are employed at the transmitter and receiver, respectively.Cooperative communication is an effective approach to exploit spatial diversity available through cooperating terminals' relaying signals for one another [3][4][5]. Cooperative relaying network with NOMA has been extensively studied in the literature, e.g., [6][7][8]. It has been shown that the cooperative NOMA (C-NOMA) systems outperform the cooperative OMA systems in terms of the spectral efficiency [6] and the outage probability [7]. Instead of dedicated relay nodes, users can also be adopted as relays in a cooperative network. A key feature of NOMA is that users with better channel conditions have prior information about the messages of other users. Ding et al. [9] proposed a C-NOMA scheme to fully exploit the prior knowledge at the strong user, where the users could cooperate with each other via short-range communication channels. Yue et al. [10] compared different operation modes of the relay user in a C-NOMA system. The half-duplex relay user receives and transmits in separate time slots w...

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“…Now P2 is a standard semi-definite programming problem, which can be solved by CVX [20]. To tighten the approximation, the value of t n iteratively, ∀n ∈ N , until convergence.…”

Section: Solution To the Problemmentioning

confidence: 99%

Robust Secure Precoding and Antenna Selection: A Probabilistic Optimization Approach for Interference Exploitation

Wei

Masouros

2019

ICASSP 2019 - 2019 IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP)

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In this paper, to realize a power-efficient, user-centric and physical layer security-addressing system, we investigate total power minimization by jointly designing antenna selection and secure precoding for distributed antenna (DA) systems. Different from the conventional artificial noise (AN)-aided secure transmission, where AN is treated as an undesired element for the intended receiver (IR), we design AN such that it is constructive to the IR while keeping destructive to the eavesdroppers (Eves). Importantly, we investigate a practical scenario, where the IR and Eves' channel state information (CSI) is imperfectly obtained. To handle the CSI uncertainties, we solve the problem in a probabilistic manner, which statistically satisfies the IR' signal-to-interference-and-ratio (SINR) requirement by use of constructive AN and addresses security against the Eves. Simulation demonstrates our algorithm consumes much less power compared to the centralized antenna (CA) systems, as well as the DA systems with conventional AN processing. Last but not least, a user-centric and on-demand structure is presented by the algorithm, thanks to the adaptive DAs activation/deactivation mechanism.

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Energy-Efficient Full-Duplex Cooperative Nonorthogonal Multiple Access

Cited by 37 publications

References 17 publications

Resource Allocation for Wireless-Powered Full-Duplex Relaying Systems With Nonlinear Energy Harvesting Efficiency

Resource Allocation for Wireless-Powered Full-Duplex Relaying Systems With Nonlinear Energy Harvesting Efficiency

Cooperative Asynchronous Non-Orthogonal Multiple Access With Power Minimization Under QoS Constraints

Robust Secure Precoding and Antenna Selection: A Probabilistic Optimization Approach for Interference Exploitation

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