Imperial College London
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ProfessorBrunoClerckx

Faculty of Engineering, Department of Electrical and Electronic Engineering

Professor of Wireless Communications and Signal Processing
 
 
 
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Contact

 

+44 (0)20 7594 6234b.clerckx Website

 
 
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Location

 

816Electrical EngineeringSouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@article{Clerckx:2018:10.1109/TSP.2017.2775593,
author = {Clerckx, B},
doi = {10.1109/TSP.2017.2775593},
journal = {IEEE Transactions on Signal Processing},
pages = {847--862},
title = {Wireless information and power transfer: nonlinearity, waveform design, and rate-energy tradeoff},
url = {http://dx.doi.org/10.1109/TSP.2017.2775593},
volume = {66},
year = {2018}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - The design of wireless information and power transfer (WIPT) has so far relied on an oversimplified and inaccurate linear model of the energy harvester. In this paper, we depart from this linear model and design WIPT considering the rectifier nonlinearity. We develop a tractable model of the rectifier nonlinearity that is flexible enough to cope with general multicarrier modulated input waveforms. Leveraging that model, we motivate and introduce a novel WIPT architecture relying on the superposition of multicarrier unmodulated and modulated waveforms at the transmitter. The superposed WIPT waveforms are optimized as a function of the channel state information so as to characterize the rate-energy region of the whole system. Analysis and numerical results illustrate the performance of the derived waveforms and WIPT architecture and highlight that nonlinearity radically changes the design of WIPT. We make key and refreshing observations. First, analysis (confirmed by circuit simulations) shows that modulated and unmodulated waveforms are not equally suitable for wireless power delivery, namely, modulation being beneficial in single-carrier transmissions but detrimental in multicarrier transmissions. Second, a multicarrier unmodulated waveform (superposed to a multicarrier modulated waveform) is useful to enlarge the rate-energy region of WIPT. Third, a combination of power splitting and time sharing is in general the best strategy. Fourth, a nonzero mean Gaussian input distribution outperforms the conventional capacity-achieving zero-mean Gaussian input distribution in multicarrier transmissions. Fifth, the rectifier nonlinearity is beneficial to system performance and is essential to efficient WIPT design.
AU  - Clerckx,B
DO  - 10.1109/TSP.2017.2775593
EP  - 862
PY  - 2018///
SN  - 1053-587X
SP  - 847
TI  - Wireless information and power transfer: nonlinearity, waveform design, and rate-energy tradeoff
T2  - IEEE Transactions on Signal Processing
UR  - http://dx.doi.org/10.1109/TSP.2017.2775593
UR  - https://ieeexplore.ieee.org/document/8115220
UR  - http://hdl.handle.net/10044/1/53413
VL  - 66
ER  -
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