Results 21 to 30 of about 4,023,657 (313)

Envelope tracking of a radio frequency amplifier for Long Term Evolution using a three-level class-G modulator [PDF]

Advances in Radio Science, 2013
In this contribution, efficiency enhancement of a radio frequency (RF) power amplifier (PA) for Long Term Evolution (LTE) base stations using envelope tracking is investigated. The dynamically adapted drain bias voltage is provided by a three-level class-
A. Bräckle, L. Rathgeber, F. Siegert, S. Heck, M. Berroth   +4 more
doaj   +1 more source

Map-Assisted Constellation Design for mmWave WDM With OAM in Short-Range LOS Environment

IEEE Open Journal of the Communications Society, 2023
We consider a system that integrates positioning and single-user millimeter wave (mmWave) communication, where the communication part adopts wavelength division multiplexing (WDM) and orbital angular momentum (OAM).
Yuan Wang, Chen Gong, Nuo Huang, Zhengyuan Xu   +3 more
doaj   +1 more source

Channel Modeling and Signal Processing for Array-Based Visible Light Communication System Under Link Misalignment

IEEE Photonics Journal, 2022
We address the lens optimization and signal processing for array-based multiple-input multiple-output (MIMO) visible light communication, especially under link misalignment.
Jiaqi Wei, Chen Gong, Nuo Huang, Zhengyuan Xu   +3 more
doaj   +1 more source

Deep Learning-Based Robust Visible Light Positioning for High-Speed Vehicles

Photonics, 2022
Robustness is a key factor for real-time positioning and navigation, especially for high-speed vehicles. While visible light positioning (VLP) based on LED illumination and image sensors is widely studied, most of the VLP systems still suffer from the ...
Danjie Li, Zhanhang Wei, Ganhong Yang, Yi Yang, Jingwen Li, Mingyang Yu, Puxi Lin, Jiajun Lin, Shuyu Chen, Mingli Lu, Zhe Chen, Zoe Lin Jiang, Junbin Fang   +12 more
doaj   +1 more source

Multiple Wavelength Free-Space Laser Communications [PDF]

, 2003
Free-space optical communications systems in the atmosphere, based on intensity modulation and direct detection, are heavily affected by fading caused by turbulence cells of varying scale and motion.
Perlot, Nicolas, Hennes Henniger, Giggenbach, Dirk, Nicolas Perlot, Henniger, Hennes, Florian David, Robert Purvinskis, David, Florian, Dirk Giggenbach, Purvinskis, Robert   +9 more
core   +1 more source

Performance optimization of free-space optical communication protocols based on results from FSO demonstrations [PDF]

, 2007
The mobile free-space optical channel mainly suffers from relatively long link outages, produced by short-term blockings of the line-of-sight (obstacles, clouds), pointing- and tracking-errors or deep signal-fades caused by index of refraction turbulence
Bernhard Epple, Epple, Bernhard
core   +1 more source

Controllable 3D display system based on frontal projection lenticular screen [PDF]

Journal of the European Optical Society-Rapid Publications, 2014
A novel auto-stereoscopic three-dimensional (3D) projection display system based on the frontal projection lenticular screen is demonstrated. It can provide high real 3D experiences and the freedom of interaction.
Feng Q., Sang X., Yu X., Gao X., Wang P., Li C., Zhao T.   +6 more
doaj   +1 more source

A Hybrid Model for Central Bank Digital Currency Based on Blockchain

IEEE Access, 2021
With the development of blockchain technology, the research on digital currency is attracting more and more attention, especially Central Bank Digital Currency (CBDC), which plays an important role in national economic construction.
Jinnan Zhang, Rui Tian, Yanghua Cao, Xueguang Yuan, Zefeng Yu, Xin Yan, Xia Zhang   +6 more
doaj   +1 more source

High-speed optical wireless communications

, 2022
S.516-518This tutorial provides a review on high-speed optical wireless communications: Application scenarios, indoor propagation, adaptive transmission schemes using OFDM and single carrier, WDM, recent milestones reached and early ideas towards ...
Jungickel, V., Vucic, J., Langer, K.-D.
core   +1 more source

Low-Latency Optical Wireless Data-Center Networks Using Nanoseconds Semiconductor-Based Wavelength Selectors and Arrayed Waveguide Grating Router

Photonics, 2022
In order to meet the massively increasing requirements of big-data applications, data centers (DCs) are key infrastructures to cope with the associated demands, such as high performance, easy scalability, low cabling complexity and low power consumption.
Shaojuan Zhang, Xuwei Xue, Eduward Tangdiongga, Nicola Calabretta   +3 more
doaj   +1 more source