Non-Orthogonal Multiple Access in Two-Hop Wireless Powered Communication Networks

Carvalho, J. A. de; Costa, Daniel Benevides da; Lima, F. Rafael M.; Oliveira, Rodolfo; Dias, Ugo Silva

doi:10.1109/lwc.2020.2992049

Cited by 8 publications

(6 citation statements)

References 8 publications

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“…where Ω D, = {| | 2 } and ∈ {1, ⋯ , }. Similar to [20], it is assumed that 1 > 2 , ⋯ , > . Thus, the channel gains are in an ascending order, i.e., 0…”

Section: System Modelmentioning

confidence: 99%

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Outage and throughput analysis of power-beacon assisted nonlinear energy harvesting NOMA multi-user relay system over Nakagami-m fading channels

Hoang

Nguyen

Trung

2020

Heliyon

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This paper considers a non-orthogonal multiple access (NOMA) multiuser relay system where both source and relay harvest the energy from a power beacon (PB) equipped with multiple antennas and use this harvested energy to transmit signals to several users. Realistic nonlinear energy harvesting models are applied, and time switching protocols are adopted at source and relay. We successfully derive the exact closed-form expressions of the outage probability and throughput of the system over Nakagami-fading channels. Then, we use Monte-Carlo simulations to validate the correctness of these derived mathematical expressions. Numerical results show that a higher saturated power threshold of the nonlinear energy harvester results in lower outage probability and higher throughput. Moreover, the optimal time switching ratio that maximizes the throughput is smaller than the optimal time switching ratio that minimizes the outage probability.

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“…where Ω D, = {| | 2 } and ∈ {1, ⋯ , }. Similar to [20], it is assumed that 1 > 2 , ⋯ , > . Thus, the channel gains are in an ascending order, i.e., 0…”

Section: System Modelmentioning

confidence: 99%

“…Moreover, the power was transferred from a primary base station (PBS) or a cognitive base station (CBS). The most related work to our paper is [20]. However, the authors considered the information source harvests the energy from the power source over Rayleigh fading channels by using the non-linear energy harvester.…”

Section: Introductionmentioning

confidence: 99%

Outage and throughput analysis of power-beacon assisted nonlinear energy harvesting NOMA multi-user relay system over Nakagami-m fading channels

Hoang

Nguyen

Trung

2020

Heliyon

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“…Starting from the strongest, each signal is successively decoded treating the remaining ones as noise and then subtracting it from the received signal. Recent research on SIC focuses on resource allocation, such as [23] optimizing the power allocation in wireless powered communication networks to satisfy the minimum data requirements for each user and [24] studying the optimal power allocation coefficients from a user fairness perspective. A major disadvantage of SIC is that it generally requires large differences in the received power of different users.…”

Section: Introductionmentioning

confidence: 99%

Rate Compatible Modulation for Correlated Information Sources

et al. 2021

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In this paper we consider the problem of transmitting spatially Correlated Information Sources (CIS) over the Additive White Gaussian Noise (AWGN) Multiple Access Channel (MAC) with transmitted energy constraint. It is well known that the system performance is optimized if the codewords are designed to take advantage of the correlation among sources in the multiple access channel. To that end, we make use of Rate Compatible Modulation (RCM) codes, whose sparse nature is advantageous to preserve the source correlation in the MAC. In order to exploit the source correlation, the proposed RCM-CIS system is comprised of a set of RCM codes that share the same random structure but with each code having its own weight values that are jointly designed. At the receiver, non-binary decoding is applied to avoid short length cycles that arise in the factor graph, which is obtained by jointly considering the source correlation and the RCM codes. Simulation results show that for high throughput transmission rate RCM-CIS has good performance in terms of the BER vs SNR, attaining values below the Shannon limit if source-channel separation is assumed. As shown by the numerical results, the proposed RCM system inherits the high error floors encountered in point-to-point RCM codes. In order to lower the error floor, we propose the use of a Low Density Generation Matrix (LDGM) code in parallel with the proposed RCM structure. The LDGM system transmits a small fraction of the total coded sequence, and it is capable of correcting the residual errors produced by the RCM-CIS system.

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“…[7,8] considered network throughput maxi-mization problem by jointly optimizing the time allocation of WET and WIT. [15] proposed a non-orthogonal multiple access (NOMA) scheme for an uplink of WPCN, and [16] further considered NOMA in a two-hop WPCN. [17] studied beamforming design in a relay-based full-duplex MISO WPCN.…”

Section: Introductionmentioning

confidence: 99%

Optimal time allocation for throughput maximization in backscatter assisted wireless powered communication networks

2021

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Integrating backscatter communication (BackCom) into wireless powered communication networks (WPCNs) makes it possible to transmit information and harvest energy simultaneously, which is regarded as a promising method to enhance the throughput. A very important issue is how to allocate the charging time and transmitting time to efficiently utilize the energy in hybrid access point (HAP) so as to improve the network performance. This paper adopts convex optimization to handle the time allocation for both WPCNs and BackCom users. A two-stage efficient algorithm is proposed to solve the problem of sumthroughput maximization (STM) subject to the basic throughput requirements of Back-Com users, where the Lagrange duality method is applied at the first-stage, while golden section and bisection method are jointly used at the second-stage. In order to solve the throughput unfairness among nodes in the STM problem, the common-throughput maximization (CTM; i.e. the worst node's throughput) problem is further considered. This problem is decomposed into a master problem and a sub-problem, which are solved in a progressive manner. Simulation results show that the proposed methods obtain substantial improvement compared to the benchmark scheme.How to cite this article: Sun J, Zhang S, Chi K. Optimal time allocation for throughput maximization in backscatter assisted wireless powered communication networks.

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Non-Orthogonal Multiple Access in Two-Hop Wireless Powered Communication Networks

Cited by 8 publications

References 8 publications

Outage and throughput analysis of power-beacon assisted nonlinear energy harvesting NOMA multi-user relay system over Nakagami-m fading channels

Outage and throughput analysis of power-beacon assisted nonlinear energy harvesting NOMA multi-user relay system over Nakagami-m fading channels

Rate Compatible Modulation for Correlated Information Sources

Optimal time allocation for throughput maximization in backscatter assisted wireless powered communication networks

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