Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: On the Beneficial Roles of Fading and Transmit Diversity in Wireless
  Power Transfer with Nonlinear Energy Harvesting   We study the effect of channel fading in Wireless Power Transfer (WPT) and
show that fading enhances the RFto- DC conversion efficiency of nonlinear RF
energy harvesters. We then develop a new form of signal design for WPT, denoted
as Transmit Diversity, that relies on multiple dumb antennas at the transmitter
to induce fast fluctuations of the wireless channel. Those fluctuations boost
the RF-to-DC conversion efficiency thanks to the energy harvester nonlinearity.
In contrast with (energy) beamforming, Transmit Diversity does not rely on
Channel State Information at the Transmitter (CSIT) and does not increase the
average power at the energy harvester input, though it still enhances the
overall end-to-end power transfer efficiency. Transmit Diversity is also
combined with recently developed (energy) waveform and modulation to provide
further enhancements. The efficacy of the scheme is analyzed using
physics-based and curve fitting-based nonlinear models of the energy harvester
and demonstrated using circuit simulations, prototyping and experimentation.
Measurements with two transmit antennas reveal gains of 50%in harvested DC
power over a single transmit antenna setup. The work (again) highlights the
crucial role played by the harvester nonlinearity and demonstrates that
multiple transmit antennas can be beneficial to WPT even in the absence of
CSIT.

0
The categories of this paper are: hep-ph
10
The categories of this paper are: q-bio
23
The categories of this paper are: solv-int
26
The categories of this paper are: bayes-an
20
The categories of this paper are: acc-phys
13
The categories of this paper are: quant-ph
15
The categories of this paper are: nucl-ex
6
The categories of this paper are: astro-ph
27
The categories of this paper are: comp-gas
31
The categories of this paper are: ao-sci
21
The categories of this paper are: adap-org
5
The categories of this paper are: gr-qc
16
The categories of this paper are: stat
4
The categories of this paper are: cond-mat
7
The categories of this paper are: hep-th
18
The categories of this paper are: econ