Wireless information and power transfer: nonlinearity, waveform design, and rate-energy tradeoff
File(s)SWIPT_waveform_TSP_final.pdf (425.88 KB)
Accepted version
Author(s)
Clerckx, B
Type
Journal Article
Abstract
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.
Date Issued
2018-02-15
Date Acceptance
2017-11-08
ISSN
1053-587X
Publisher
Institute of Electrical and Electronics Engineers
Start Page
847
End Page
862
Journal / Book Title
IEEE Transactions on Signal Processing
Volume
66
Issue
4
Copyright Statement
© 2017 IEEE. Personal use is permitted, but republication/redistribution requires IEEE permission.
See http://www.ieee.org/publications
standards/publications/rights/index.html for more information.
See http://www.ieee.org/publications
standards/publications/rights/index.html for more information.
Sponsor
Engineering & Physical Science Research Council (EPSRC)
Identifier
https://ieeexplore.ieee.org/document/8115220
Grant Number
EP/N015312/1
Subjects
Science & Technology
Technology
Engineering, Electrical & Electronic
Engineering
Nonlinearity
optimization
waveform
wireless power
wireless information and power transfer
MIMO INTERFERENCE CHANNEL
SYSTEMS
EFFICIENCY
COMMUNICATION
TRANSMISSION
NETWORKS
Networking & Telecommunications
Publication Status
Published
Date Publish Online
2017-11-20