Retrodirective Frequency Diverse Array Focusing for Wireless Information and Power Transfer

Simultaneous wireless information and power transfer (WIPT) has so far mainly relied on a phased-array antenna, but only angle-focusing capability without range focusing can be achieved for phased-array antennas. In this paper, we depart from the phased-array antenna and propose the use of retrodire...

Full description

Saved in:
Bibliographic Details
Published in:IEEE journal on selected areas in communications 2019-01, Vol.37 (1), p.61-73
Main Author: Wang, Wen-Qin
Format: Article
Language:English
Subjects:
Acoustic beams
Antenna arrays
Antennas
Array signal processing
Beamforming
Communication system security
Direction of arrival
Energy efficiency
energy efficiency optimization
focused beamforming
Focusing
frequency diverse array
Mixers
Offsets
Phased arrays
Power transfer
Robustness (mathematics)
secure communications
Time dependence
transmit beamforming
Wireless communication
Wireless information and power transfer (WIPT)
wireless power transfer
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Simultaneous wireless information and power transfer (WIPT) has so far mainly relied on a phased-array antenna, but only angle-focusing capability without range focusing can be achieved for phased-array antennas. In this paper, we depart from the phased-array antenna and propose the use of retrodirective frequency diverse array (FDA) focusing in base station for long-range WIPT applications. In the retrodirective FDA focusing, an additional small frequency offset is added across the phase-conjugating mixers in the retrodirective array to produce both range-dimension and angle-dimension focused beamforming for energy-efficient WIPT. The FDA beampattern is decoupled in range-angle dimension and can be independently controlled through properly designing the transmit weighting vector or frequency offsets. More importantly, the proposed WIPT scheme allows self-tracking the direction-of-arrival of the pilot signals without requirement of any a priori knowledge. A maximum efficiency optimization approach based on discrete prolate spheroidal sequence is also proposed for the beampattern synthesis. In addition, robust physical-layer security can be obtained by utilizing FDA angle-range-time-dependent beampattern characteristics. The harvested energy, achievable bit rate, and achievable secrecy rate at the user receivers are derived for the WIPT, along with extensive numerical results. Both the theoretical analysis and numerical results verify the superiority of FDA over phased array in energy efficiency and security for WIPT applications.
ISSN:0733-8716
1558-0008
DOI:10.1109/JSAC.2018.2872360