Optimum transmission policies for energy harvesting two-way relay channels

Abstract-This work considers an energy harvesting transmitter that gathers a continuous flow of energy from intermittent sources, thus relaxing the modeling assumption of discrete amounts of harvested energy present in all previous work on energy harvesting communications. Tools from convex analysis are utilized to describe the optimal transmission policy as the boundary of a properly defined region based on the energy profile. The results are extended to include models where the transmitter has a finite capacity battery with various imperfections, as well as those that incorporate a processing cost (circuit power) at the transmitter whenever it is in operation.

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“…We can concavifỹ r(p) by time sharing between achievable points on it, as done in [21], [25], [32], i.e., r c (p) = (p/p * )r(ηp…”

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confidence: 99%

Energy harvesting communications with continuous energy arrivals

Varan

Tutuncuoglu

Yener

2014

2014 Information Theory and Applications Workshop (ITA)

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“…In (11), Λ(x,x) denotes the log-likelihood ratio (LLR) of the joint probability density functions (PDFs) P(y 1 , . .…”

Section: A Diversitymentioning

confidence: 99%

Open-Loop End-to-End Transmission for Multihop Opportunistic Networks With Energy-Harvesting Devices

Lai

Lee

Chen

et al. 2016

IEEE Trans. Commun.

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Networks formed by energy-harvesting devices impose new technological challenges on data transmission due to uncertainty of the amount of energy that can be harvested. This is even more challenging with multihop networks, in which transmission outage occurs when one single device along the relay path cannot harvest enough energy. A virtual multiple-input multiple-output (MIMO) model for multihop, multipath networks has recently been developed to facilitate reliable open-loop endto-end transmissions, making networks robust to random transmission outages without the necessity of bandwidth-consuming and complicated end-to-end feedback and control. In this paper, a framework based on a virtual MIMO model of multihop, multipath opportunistic networks formed by energy-harvesting devices is developed. We propose rotated-algebraic path-time codes (RA-PTC), by which data are encoded using Givens rotation and cyclic division algebras. Without rate loss, a form of time diversity is exploited by repeatedly transmitting the RA-PTCcoded data. Extensive theoretical analyses are carried out using amount of fading and diversity as metrics. Both the performance enhancement due to the proposed RA-PTC and the performance loss due to energy shortage are quantified. Furthermore, a simple yet effective cyclic power control is proposed to improve transmission reliability. Numerical results demonstrate that RA-PTC and cyclic power control enable efficient and reliable end-toend transmission in multipath, multihop opportunistic networks formed by energy-harvesting devices.

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“…Note that in a general 3-PNC, the relay can combine y AR, 3 and y BR, 3 with different power constants [7]. In this case, the received signal with a larger transmit power is weighted more and could obtain a better performance at its destination.…”

Section: B Overall Sum-ber Of the 2-pnc Schemementioning

confidence: 99%

“…However, the authors in [2] dealt with one-way relaying systems. Their work was later extended to other systems including to two-way relay networks [3,4,5,6]. Compared to a traditional non-EH-TWRN such as [7], in an EH-TWRN the relay can potentially harvest energy from one or both sources.…”

Section: Introductionmentioning

confidence: 99%

BER performance analysis and optimization for energy harvesting two-way relay networks

Huang

Sadeghi

Nasir

2016

2016 Australian Communications Theory Workshop (AusCTW)

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This paper investigates the sum-bit error rate (BER) performance of amplify-and-forward (AF) energy harvesting twoway relay networks (TWRNs), where two source nodes communicate with each other through a self-sustaining wireless relay node using time switching-based relaying (TSR) protocol. Two physical layer network coding (PNC) schemes are considered, namely twotime-slot and three-time-slot PNC, denoted by 2-PNC and 3-PNC, respectively. We derive analytical expressions for the sum-BER of these two schemes and propose to appropriately time share between modulation schemes of different dimensions according to the energy harvesting time fraction in order to normalize the spectral efficiency. Simulation and numerical experiments are performed to verify our analysis. It is observed that 3-PNC outperforms 2-PNC in terms of sum-BER when the energy harvesting time fraction is small. However, this fraction can be optimized such that the 2-PNC scheme achieves better overall sum-BER performance.

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Optimum transmission policies for energy harvesting two-way relay channels

Cited by 51 publications

References 12 publications

Energy harvesting communications with continuous energy arrivals

Energy harvesting communications with continuous energy arrivals

Open-Loop End-to-End Transmission for Multihop Opportunistic Networks With Energy-Harvesting Devices

BER performance analysis and optimization for energy harvesting two-way relay networks

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