Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Wireless Information and Power Transfer: Nonlinearity, Waveform Design
  and Rate-Energy Tradeoff   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
multi-carrier 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 multi-carrier transmissions. Second, a multicarrier unmodulated
waveform (superposed to a multi-carrier 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 non-zero mean
Gaussian input distribution outperforms the conventional capacity-achieving
zero-mean Gaussian input distribution in multi-carrier transmissions. Fifth,
the rectifier nonlinearity is beneficial to system performance and is essential
to efficient WIPT design.

31
The categories of this paper are: ao-sci
27
The categories of this paper are: comp-gas
6
The categories of this paper are: astro-ph
35
The categories of this paper are: mtrl-th
4
The categories of this paper are: cond-mat
13
The categories of this paper are: quant-ph
15
The categories of this paper are: nucl-ex
22
The categories of this paper are: chao-dyn
16
The categories of this paper are: stat
9
The categories of this paper are: nlin
24
The categories of this paper are: dg-ga
36
The categories of this paper are: cmp-lg
18
The categories of this paper are: econ
14
The categories of this paper are: math-ph
21
The categories of this paper are: adap-org
17
The categories of this paper are: q-fin