Results 11 to 20 of about 61,791 (241)

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

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

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

Energy Transfer and Cross-Relaxation Induced Efficient 2.78 μm Emission in Er³⁺/Tm³⁺: PbF₂ mid-Infrared Laser Crystal

Crystals, 2021
An efficient enhancement of 2.78 μm emission from the transition of Er3+: 4I11/2 → 4I13/2 by Tm3+ introduction in the Er/Tm: PbF2 crystal was grown by the Bridgman technique for the first time. The spectroscopic properties, energy transfer mechanism, and
Jiayu Liao, Qiudi Chen, Xiaochen Niu, Peixiong Zhang, Huiyu Tan, Fengkai Ma, Zhen Li, Siqi Zhu, Yin Hang, Qiguo Yang, Zhenqiang Chen   +10 more
doaj   +1 more source

Ultra-narrow Band Perfect Absorber and Its Application as Plasmonic Sensor in the Visible Region

Nanoscale Research Letters, 2017
We propose and numerically investigate a perfect ultra-narrowband absorber with an absorption bandwidth of only 1.82 nm and an absorption efficiency exceeding 95% in the visible region.
Dong Wu, Ruifang Li, Yumin Liu, Zhongyuan Yu, Li Yu, Lei Chen, Chang Liu, Rui Ma, Han Ye   +8 more
doaj   +1 more source

Design of a 0.13 µm SiGe Limiting Amplifier with 14.6 THz Gain-Bandwidth-Product [PDF]

Advances in Radio Science, 2017
This paper presents the design of a limiting amplifier with 1-to-3 fan-out implementation in a 0.13 µm SiGe BiCMOS technology and gives a detailed guideline to determine the circuit parameters of the amplifier for optimum high-frequency performance ...
S. Park, X.-Q. Du, M. Grözing, M. Berroth   +3 more
doaj   +1 more source