System Outage Performance for Three-Step Two-Way Energy Harvesting DF Relaying

Shi, Liqin; Ye, Yinghui; Hu, Rose Qingyang; Zhang, Hailin

doi:10.1109/tvt.2019.2897505

Cited by 25 publications

(28 citation statements)

References 35 publications

(84 reference statements)

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“…The channel of S 1 -R and R-S 2 are affected by Additive White Gauss Noise (AWGN) and block fading, that is, the channel coefficient is constant during one time slot, but it changes independently from one slot to another. In addition, the channel is considered reciprocal [38], [39], then the channel coefficients of…”

Section: Network Modelmentioning

confidence: 99%

Throughput Maximization for Two-Way Buffer-Aided and Energy-Harvesting Enabled Multi-Relay Networks

Zeng

Xiao

et al. 2019

IEEE Access

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For years, relay communications have been witnessed to extend the network coverage and improve the throughput and reliability of wireless systems. In this paper, we focus on throughput maximization for the two-way buffer-aided relay network with finite data buffers and limited energy battery, wherein relays have no fixed power supply and they replenish energy from the Radio Frequency (RF) signal radiated by source nodes. Specifically, by jointing the time switching and energy splitting for RF energy harvesting, we introduce a three time-subslot transmission model to balance the energy storage and the energy consumption for communication. On top of this transmission model, we formulate an optimization problem for throughput maximization of relay network. We purposely convert the non-convex optimization problem into a convex one by carefully decoupling and relaxing. Further, we theoretically derive the maximum throughput and apply an iterative algorithm to achieve the suboptimal solution based on relay selection and power allocation. In addition to solving the no-delay limited throughput maximization problem, we put forward the solution of the delay limited transmission in the two-way buffer-aided multi-relay networks. Extensive simulations have been conducted to demonstrate that our proposed strategy is able to significantly improve the sum-throughput under transmission energy and delay constraints. INDEX TERMS Two-way relay networks, buffer-aided, energy harvesting, dual optimization.

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Section: Network Modelmentioning

confidence: 99%

Throughput Maximization for Two-Way Buffer-Aided and Energy-Harvesting Enabled Multi-Relay Networks

Zeng

Xiao

et al. 2019

IEEE Access

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“…Besides the above simulation parameters, the distances are set as: d p = 10 metres, d p 1 = 5 metres, d p 2 = 3 metres, d p 3 = 4 metres, d 11 = 4 metres, d 12 = 2 metres, d 13 = 3 metres, d 21 = 1.2 metres, d 22 = 2 metres, d 23 = 1.5 metres, d s 1 = 7 metres, d s 2 = 9 metres, and d s 3 = 8 metres. According to [34], we suppose that the LT transmits its signal at 915 MHz and the antenna gain for each BD is set to be 1.8 dBi, while the antenna gains for the LT, the LR and the BRs are all set as 6 dBi.…”

Section: Simulation and Discussionmentioning

confidence: 99%

“…(1) m = vm 2 + 1 2 . Based on (28), (29), (30) and (34), P bc out,l can be obtained. Accordingly, the lower bound for the outage probability of the legacy transmission in the best case can be written as…”

Section: A Outage Probability Under the Best Casementioning

confidence: 99%

On the Outage Performance of Ambient Backscatter Communications

Shi

Chu

et al. 2020

IEEE Internet Things J.

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Ambient backscatter communications (AmBack-Coms) have been recognized as a spectrum-and energy-efficient technology for Internet of Things, as it allows passive backscatter devices (BDs) to modulate their information into the legacy signals, e.g., cellular signals, and reflect them to their associated receivers while harvesting energy from the legacy signals to power their circuit operation. However, the co-channel interference between the backscatter link and the legacy link and the nonlinear behavior of energy harvesters at the BDs have largely been ignored in the performance analysis of AmBackComs. Taking these two aspects, this paper provides a comprehensive outage performance analysis for an AmBackCom system with multiple backscatter links, where one of the backscatter links is opportunistically selected to leverage the legacy signals transmitted in a given resource block. For any selected backscatter link, we propose an adaptive reflection coefficient (RC), which is adapted to the non-linear energy harvesting (EH) model and the location of the selected backscatter link, to minimize the outage probability of the backscatter link. In order to study the impact of co-channel interference on both backscatter and legacy links, for a selected backscatter link, we derive the outage probabilities for the legacy link and the backscatter link. Furthermore, we study the best and worst outage performances for the backscatter system where the selected backscatter link maximizes or minimizes the signal-tointerference-plus noise ratio (SINR) at the backscatter receiver. We also study the best and worst outage performances for the legacy link where the selected backscatter link results in the lowest and highest co-channel interference to the legacy receiver, respectively. Computer simulations validate our analytical results, and reveal the impacts of the co-channel interference and the EH model on the AmBackCom performance. In particular, the cochannel interference leads to the outage saturation phenomenon in AmBackComs, and the conventional linear EH model results in an over-estimated outage performance for the backscatter link.

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“…This motivates us to consider the assumption of perfect CSI. 3 In this work, it is assumed that the transmission time length of the A-R link equals that of the B-R link, the same as in [9], [15], [16]. It is worth pointing out that allowing different time lengths for the A-R and B-R links can further improve the performance of the SWIPT enabled two-way DF relaying network, which is beyond the scope of this paper and will be considered in our future work.…”

Section: Introductionmentioning

confidence: 99%

Energy Efficiency Maximization for SWIPT Enabled Two-Way DF Relaying

Shi

et al. 2019

IEEE Signal Process. Lett.

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This paper focuses on the design of an optimal resource allocation scheme to maximize the energy efficiency (EE) in a simultaneous wireless information and power transfer (SWIPT) enabled two-way decode-and-forward (DF) relay network under a non-linear energy harvesting model. In particular, we formulate an optimization problem by jointly optimizing the transmit powers of two source nodes, the power-splitting (PS) ratios of the relay, and the time for the source-relay transmission, under multiple constraints including the transmit power constraints at sources and the minimum rate requirement. Although the formulated problem is non-convex, an iterative algorithm is developed to obtain the optimal resource allocation. Simulation results verify the proposed algorithm and show that the designed resource allocation scheme is superior to other benchmark schemes in terms of EE.

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System Outage Performance for Three-Step Two-Way Energy Harvesting DF Relaying

Cited by 25 publications

References 35 publications

Throughput Maximization for Two-Way Buffer-Aided and Energy-Harvesting Enabled Multi-Relay Networks

Throughput Maximization for Two-Way Buffer-Aided and Energy-Harvesting Enabled Multi-Relay Networks

On the Outage Performance of Ambient Backscatter Communications

Energy Efficiency Maximization for SWIPT Enabled Two-Way DF Relaying

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