Results 81 to 90 of about 8,940 (185)

Ambient Light Backscatter Communication for IoT Applications

open access: yesJournal of electromagnetic engineering and science, 2016
In this paper, we present an ambient light backscatter communication design that enables Internet of Things (IoT) devices to communicate through the backscattering ambient light emitted from lighting infrastructure or sunlight. The device can selectively modulate ambient light by switching a liquid crystal display (LCD) shutter located on its surface ...
Jisu Yun, Byung-Jun Jang
openaire   +2 more sources

Research progress and evolution prospect of passive internet of things communication

open access: yes物联网学报, 2023
Passive internet of things (IoT) is the fundamentally enabling technology of promoting digital transformation and upgrading of industries.In recent years, passive IoT communication technology such as radio frequency identification has been widely used in
Yuan LI   +6 more
doaj   +2 more sources

Trends in aerosol abundances and distributions [PDF]

open access: yes
The properties of aerosols that reside in the upper atmosphere are described. Special emphasis is given to the influence these aerosols have on ozone observation systems, mainly through radiative effects, and on ambient ozone concentrations, mainly ...
Clancy, R. T.   +9 more
core   +1 more source

A 1T2R High-Sensitivity and Dual-Channel Transceiver for Backscatter Communication Systems

open access: yesIEEE Access
Owing to the rapid development of the ambient Internet of Things (IoT) industry, Backscatter Communication Systems (BCS) require higher receiver sensitivity for large-scale IoT scenarios than traditional Radio Frequency Identification (RFID) systems ...
Sijia Lai   +5 more
doaj   +1 more source

Preliminary assessment of the vacuum environment in the wake of large space vehicles [PDF]

open access: yes
The vacuum environment in the wake region of presently planned large space vehicles is calculated using simplified models of the particle fluxes from the various sources.
Naumann, R. J., Oran, W. A.
core   +1 more source

Pattern-Based Decoding for Wi-Fi Backscatter Communication of Passive Sensors

open access: yesSensors, 2019
Ambient backscatter communication enables passive sensors to convey sensing data on ambient RF signals in the air at ultralow power consumption. To extract data bits from such signals, threshold-based decoding has generally been considered, but suffers ...
Hwanwoong Hwang   +3 more
doaj   +1 more source

Extinction and backscatter measurements of Antarctic PSC's, 1987: Implications for particle and vapor removal [PDF]

open access: yes
The temperature dependence is examined of optical properties measured in the Antarctic during 1987 at the 70 mb level (near 18 km), a level chosen to correlate the results with in situ measurements made from the NASA-Ames ER-2 aircraft during the 1987 ...
Browell, Edward V.   +8 more
core   +1 more source

A theoretical/experimental program to develop active optical pollution sensors: Quantitative remote Raman lidar measurements of pollutants from stationary sources [PDF]

open access: yes
Typical pollutant gas concentrations at the stack exits of stationary sources can be estimated to be about 500 ppm under the present emission standards.
Brumfield, M. L.   +2 more
core   +1 more source

Key technologies and challenges of 6G

open access: yesDianzi Jishu Yingyong
6G and future communication system networks will meet the requirements of a world fully connected, and revolutionary technology solutions are expected to drive the rapid growth of smart devices and service applications.
Lu Xujun, Zheng Jianfei, Xia Zhu
doaj   +1 more source

Ionosphere/microwave beam interaction study [PDF]

open access: yes
A solar power satellite microwave power density of 20mw sq cm was confirmed as the level where nonlinear interactions may occur in the ionosphere, particularly at 100 km altitude.
Duncan, L. M., Gordon, W. E.
core   +1 more source

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