Abstract
In this chapter, we investigate a wireless powered communication network (WPCN) comprised of a power beacon that broadcasts radio frequency (RF) energy to a set of energy harvesting (EH) transmitters equipped with unlimited batteries, which use the harvested energy to transmit information back to the power-beacon in a non-orthogonal multiple access fashion. For this network, we propose a scheme which achieves the capacity region. Moreover, we show that the capacity region of the considered WPCN converges to the capacity region of its non-EH multiple access network, where the non-EH transmitters have specific average power constraints.
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- 1.
By non-EH system we mean a communication network that is comprised of nodes which have unlimited power supply that they can use for transmitting information.
- 2.
We adopt the normalized energy unit Joule-per-second. As a result, we use the terms “energy” and “power” interchangeably.
- 3.
This simplification is without any loss to the average data rate.
- 4.
When we say that it holds for practically all time slots, we mean that it holds for all time slots or that it holds for all time slots except for a negligible fraction of them, denoted by \(\varDelta \), which satisfies \(\lim _{N\rightarrow \infty } \varDelta /N=0\).
- 5.
- 6.
Note that, if a different decoding priory is needed other than K, \(K-1\), ...,1, then, without loss of generality, the EH transmitters can be renumbered such that \(\nu _1\ge \nu _2\ge ...\ge \nu _K\) again holds, where EH transmitter 1 is related to \(\nu _1\), EH transmitter 2 is related to \(\nu _2\), ..., and EH transmitter K is related to \(\nu _K\), see [15].
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Zlatanov, N., Hadzi-Velkov, Z., Ng, D.W.K. (2016). Asymptotically Optimal Power Allocation for Wireless Powered Communication Network with Non-orthogonal Multiple Access. In: Nikoletseas, S., Yang, Y., Georgiadis, A. (eds) Wireless Power Transfer Algorithms, Technologies and Applications in Ad Hoc Communication Networks. Springer, Cham. https://doi.org/10.1007/978-3-319-46810-5_10
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