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Transmission with Energy Harvesting Nodes in Fading Wireless Channels: Optimal Policies
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This paper considers optimization of point-to-point data transmission with an energy harvesting transmitter which has a limited battery capacity, communicating in a wireless fading channel, and introduces a directional water-filling algorithm which provides a simple and concise interpretation of the necessary optimality conditions.Abstract:
Wireless systems comprised of rechargeable nodes have a significantly prolonged lifetime and are sustainable. A distinct characteristic of these systems is the fact that the nodes can harvest energy throughout the duration in which communication takes place. As such, transmission policies of the nodes need to adapt to these harvested energy arrivals. In this paper, we consider optimization of point-to-point data transmission with an energy harvesting transmitter which has a limited battery capacity, communicating in a wireless fading channel. We consider two objectives: maximizing the throughput by a deadline, and minimizing the transmission completion time of the communication session. We optimize these objectives by controlling the time sequence of transmit powers subject to energy storage capacity and causality constraints. We, first, study optimal offline policies. We introduce a directional water-filling algorithm which provides a simple and concise interpretation of the necessary optimality conditions. We show the optimality of an adaptive directional water-filling algorithm for the throughput maximization problem. We solve the transmission completion time minimization problem by utilizing its equivalence to its throughput maximization counterpart. Next, we consider online policies. We use stochastic dynamic programming to solve for the optimal online policy that maximizes the average number of bits delivered by a deadline under stochastic fading and energy arrival processes with causal channel state feedback. We also propose near-optimal policies with reduced complexity, and numerically study their performances along with the performances of the offline and online optimal policies under various different configurations.read more
Citations
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Dynamic Computation Offloading for Mobile-Edge Computing With Energy Harvesting Devices
TL;DR: In this paper, a low-complexity online algorithm is proposed, namely, the Lyapunov optimization-based dynamic computation offloading algorithm, which jointly decides the offloading decision, the CPU-cycle frequencies for mobile execution, and the transmit power for computing offloading.
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Throughput Maximization for UAV-Enabled Mobile Relaying Systems
TL;DR: Numerical results show that by optimizing the trajectory of the relay and power allocations adaptive to its induced channel variation, mobile relaying is able to achieve significant throughput gains over the conventional static relaying.
Journal ArticleDOI
Energy Harvesting Wireless Communications: A Review of Recent Advances
Sennur Ulukus,Aylin Yener,Elza Erkip,Osvaldo Simeone,Michele Zorzi,Pulkit Grover,Kaibin Huang +6 more
TL;DR: The current state of the art for wireless networks composed of energy harvesting nodes, starting from the information-theoretic performance limits to transmission scheduling policies and resource allocation, medium access, and networking issues are provided.
Posted Content
Optimal Packet Scheduling in an Energy Harvesting Communication System
Jing Yang,Sennur Ulukus +1 more
TL;DR: This work develops optimal off-line scheduling policies which minimize the time by which all packets are delivered to the destination, under causality constraints on both data and energy arrivals.
Journal ArticleDOI
A Survey of Energy-Efficient Techniques for 5G Networks and Challenges Ahead
TL;DR: This survey provides an overview of energy-efficient wireless communications, reviews seminal and recent contribution to the state-of-the-art, including the papers published in this special issue, and discusses the most relevant research challenges to be addressed in the future.
References
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Book
Dynamic Programming and Optimal Control
TL;DR: The leading and most up-to-date textbook on the far-ranging algorithmic methododogy of Dynamic Programming, which can be used for optimal control, Markovian decision problems, planning and sequential decision making under uncertainty, and discrete/combinatorial optimization.
Journal ArticleDOI
Capacity of fading channels with channel side information
Andrea Goldsmith,Pravin Varaiya +1 more
TL;DR: The Shannon capacity of a fading channel with channel side information at the transmitter and receiver, and at the receiver alone is obtained, analogous to water-pouring in frequency for time-invariant frequency-selective fading channels.
Journal ArticleDOI
Optimal Packet Scheduling in an Energy Harvesting Communication System
Jing Yang,Sennur Ulukus +1 more
TL;DR: In this article, the authors consider the optimal packet scheduling problem in a single-user EH wireless communication system, where both the data packets and the harvested energy are modeled to arrive at the source node randomly and the goal is to adaptively change the transmission rate according to the traffic load and available energy, such that the time by which all packets are delivered is minimized.
Journal ArticleDOI
Optimum Transmission Policies for Battery Limited Energy Harvesting Nodes
Kaya Tutuncuoglu,Aylin Yener +1 more
TL;DR: This work considers transmission policies for rechargeable nodes with energy harvesting battery equipped nodes, and optimum solutions for two related problems are identified, including the transmission policy that maximizes the short term throughput.