2,502 research outputs found
Large-Scale Multi-Antenna Multi-Sine Wireless Power Transfer
Wireless Power Transfer (WPT) is expected to be a technology reshaping the
landscape of low-power applications such as the Internet of Things, Radio
Frequency identification (RFID) networks, etc. Although there has been some
progress towards multi-antenna multi-sine WPT design, the large-scale design of
WPT, reminiscent of massive MIMO in communications, remains an open challenge.
In this paper, we derive efficient multiuser algorithms based on a
generalizable optimization framework, in order to design transmit sinewaves
that maximize the weighted-sum/minimum rectenna output DC voltage. The study
highlights the significant effect of the nonlinearity introduced by the
rectification process on the design of waveforms in multiuser systems.
Interestingly, in the single-user case, the optimal spatial domain beamforming,
obtained prior to the frequency domain power allocation optimization, turns out
to be Maximum Ratio Transmission (MRT). In contrast, in the general weighted
sum criterion maximization problem, the spatial domain beamforming optimization
and the frequency domain power allocation optimization are coupled. Assuming
channel hardening, low-complexity algorithms are proposed based on asymptotic
analysis, to maximize the two criteria. The structure of the asymptotically
optimal spatial domain precoder can be found prior to the optimization. The
performance of the proposed algorithms is evaluated. Numerical results confirm
the inefficiency of the linear model-based design for the single and multi-user
scenarios. It is also shown that as nonlinear model-based designs, the proposed
algorithms can benefit from an increasing number of sinewaves.Comment: Accepted to IEEE Transactions on Signal Processin
Recent Advances in Joint Wireless Energy and Information Transfer
In this paper, we provide an overview of the recent advances in
microwave-enabled wireless energy transfer (WET) technologies and their
applications in wireless communications. Specifically, we divide our
discussions into three parts. First, we introduce the state-of-the-art WET
technologies and the signal processing techniques to maximize the energy
transfer efficiency. Then, we discuss an interesting paradigm named
simultaneous wireless information and power transfer (SWIPT), where energy and
information are jointly transmitted using the same radio waveform. At last, we
review the recent progress in wireless powered communication networks (WPCN),
where wireless devices communicate using the power harvested by means of WET.
Extensions and future directions are also discussed in each of these areas.Comment: Conference submission accepted by ITW 201
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