Broadcast Approach for the Single-User Energy Harvesting Channel

This paper proposes a broadcast strategy for the single-user slowly fading channel in which the transmission power is supplied by an energy harvesting unit. In this strategy, the channel state information (CSI) is known only to the receiver, and the transmitter is assumed to be oblivious to the CSI....

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Bibliographic Details
Published in:IEEE transactions on communications 2019-05, Vol.67 (5), p.3192-3204
Main Authors: Zohdy, Maha, Tajer, Ali
Format: Article
Language:English
Subjects:
Algorithms
broadcast approach
Broadcasting
Economic models
Energy harvesting
Energy transmission
Fading
Fading channels
no CSIT
Optimization
Radio transmitters
Receivers
Reliability
Resource management
slowly fading channel
Transmitters
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Summary:This paper proposes a broadcast strategy for the single-user slowly fading channel in which the transmission power is supplied by an energy harvesting unit. In this strategy, the channel state information (CSI) is known only to the receiver, and the transmitter is assumed to be oblivious to the CSI. The broadcast approach enables preventing outage events in the face of the lack of CSI at the transmitter. In the proposed broadcast approach, the transmitter splits its message into multiple superimposed information layers. This facilitates sustaining reliably decodable transmission rates adapted to the unknown state of the randomly-varying fading state of the channel. The objective is to characterize the optimal allocation of the randomly varying harvested power over time and across information layers in the contexts of maximizing the average communication rate and minimizing the likelihood of outage. First, the setting in which the transmitter has non-causal and complete information about the state of the energy harvesting process is considered. A closed-form characterization of the optimal allocation of power across layers is established, and an algorithm that analytically determines the exact optimal allocation of power over time is provided. Furthermore, an online algorithm is proposed for a setting in which the energy harvesting process is known only causally to the transmitter.
ISSN:0090-6778
1558-0857
DOI:10.1109/TCOMM.2019.2895346