Wireless Information and Power Transfer: A New Paradigm for Green Communications by Dushantha Nalin K. Jayakody John Thompson Symeon Chatzinotas & Salman Durrani
Author:Dushantha Nalin K. Jayakody, John Thompson, Symeon Chatzinotas & Salman Durrani
Language: eng
Format: epub
Publisher: Springer International Publishing, Cham
6.3.1.1 Challenges with Wireless Energy Efficiency
In the previous section, we reviewed the growing focus on increasing the energy efficiency of both mobile and fixed wireless systems. Whilst we have built up a good understanding of power consumption mechanisms in terrestrial mobile networks, we still lack understanding in how nano-machines can communicate in an energy efficient manner. As communications and energy is vital for coordination and control of any system, so too will they be for nano-machines. It is envisaged that nano-scale communications will be critical to nano-machines that seek to coordinate tasks such as in vivo drug delivery and surgery [31]. Whilst many meso- and macro-scale in vivo medical devices (i.e., pacemaker) are battery powered, nano-batteries (50 μm [36]) are still significantly larger or of the same dimension as their nano-machine counter-parts. Therefore, charging batteries using externally generated acoustic [37] and electromagnetic radiation is not always viable and furthermore, nano-machines can be embedded in vivo areas that are either sensitive to radiation or difficult for radiation to penetrate. As such, energy harvesting from the nano-machines’ locality is needed, i.e., the energy source should be near the nano-machine. Over the past decade, there is increasing interest to harvest energy from communication signals and achieve simultaneous wireless information and power transfer (SWIPT). In this chapter, we draw on our understanding of energy consumption and harvesting knowledge in current wireless systems to better understand nano-scale communications and exploit opportunities.
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