Results 61 to 70 of about 126,874 (155)

Deep learning aided intelligent signal recognition for backscatter based metamaterial passive Internet of Things system

Complex & Intelligent Systems
In this paper, a single point-frequency sensing mechanism-based metamaterial passive Internet of Things (IoT) system is proposed, where the sensing of the environmental physical quantities is realized by the reflection coefficients at fixed frequency ...
Tianyuan Nie, Wenhao Zheng, Chao Ding, Yutong Bai, Lixia Xiao, Pei Xiao   +5 more
doaj   +1 more source

Low-frequency radio navigation system [PDF]

, 1983
A method of continuous wave navigation using four transmitters operating at sufficiently low frequencies to assure essentially pure groundwave operation is described.
Wallis, D. E.
core   +1 more source

Fundamental bounds on transmission through periodically perforated metal screens with experimental validation

, 2019
This paper presents a study of transmission through arrays of periodic sub-wavelength apertures. Fundamental limitations for this phenomenon are formulated as a sum rule, relating the transmission coefficient over a bandwidth to the static polarizability.
Ehrenborg, Casimir,, Ericsson, Andreas,, Gustafsson, Mats,, Ivanenko, Yevhen,, Jonsson, B. L.G.,, Ludvig-Osipov, Andrei,, Lund University., Lundgren, Johan,, Sjoberg, Daniel,   +8 more
core   +1 more source

Multiuser Communication through Power Talk in DC MicroGrids

, 2015
Power talk is a novel concept for communication among control units in MicroGrids (MGs), carried out without a dedicated modem, but by using power electronics that interface the common bus.
Angjelichinoski, Marko, Blaabjerg, Frede, Liu, Hongpeng, Loh, Poh Chiang, Popovski, Petar, Stefanovic, Cedomir   +5 more
core   +1 more source

Digital communication system [PDF]

, 1974
A digital communication system is reported for parallel operation of 16 or more transceiver units with the use of only four interconnecting wires. A remote synchronization circuit produces unit address control words sequentially in data frames of 16 ...
Monford, L. G., Jr.
core   +1 more source

Silent emergency alarm system for schools and the like [PDF]

, 1973
An emergency alert system is described. In a school each classroom (or other area) is instrumented with a hidden microphone and receiver tuned to a non-audible frequency.
Read, W. S., Roberts, V. W.
core   +1 more source

Performance Analysis of Fifth-Generation Cellular Uplink

, 2015
Fifth-generation cellular networks are expected to exhibit at least three primary physical-layer differences relative to fourth-generation ones: millimeter-wave propagation, antenna-array directionality, and densification of base stations. In this paper,
Talarico, Salvatore, Torrieri, Don, Valenti, Matthew C.   +2 more
core   +1 more source

Direct detection optical intersatellite link at 220 Mbps using AlGaAs laser diode and silicon APD with 4-ary PPM signaling [PDF]

A newly developed 220 Mbps free-space 4-ary pulse position modulation (PPM) direct detection optical communication system is described. High speed GaAs integrated circuits were used to construct the PPM encoder and receiver electronic circuits.
Davidson, Frederic M., Sun, Xiaoli
core   +1 more source

Investigations on the performances of the electrical generator of a rim-driven marine current turbine” [PDF]

, 2014
In this paper, the electrical generator of a rim-driven horizontal-axis current turbine is modeled in detail. Its main characteristics and performances are evaluated (efficiency, mass, cost, etc).
CHARPENTIER, Jean-Frederic, CLENET, Stéphane, DROUEN, Laurent, SEMAIL, Eric   +3 more
core   +1 more source

Compact hybrid spoof surface plasmon polaritons and via-free half-mode substrate integrated waveguide bandpass filter with wide stopband

Materials & Design
In this paper, a novel hybrid spoof surface plasmon polaritons (SSPPs) and via-free half-mode substrate integrated waveguide (HMSIW) is proposed to constitute a compact bandpass filter (BPF).
Baoping Ren, Junjun Zhou, Shaopeng Wan, Xuehui Guan   +3 more
doaj   +1 more source