Results 61 to 70 of about 1,738,862 (302)

Structural Divergence Between the Moltbook AI‐Agent Network and Human Social Networks

Advanced Science, EarlyView.
Analysis of the Moltbook AI‐agent network reveals a striking combination of familiar global scaling and distinct internal organization. Attention is highly concentrated, reciprocity is limited, connected triads are suppressed, and communities are strongly modular.
Wenpin Hou, Zhicheng Ji
wiley   +1 more source

Ultrahigh-Speed Signal Transmission Over Nonlinear and Dispersive Fiber Optic Channel: The Multicarrier Advantage

IEEE Photonics Journal, 2010
There is a common belief that coherent optical orthogonal frequency-division multiplexing (CO-OFDM) has inferior nonlinear performance in the fiber optic channel due to its high peak-to-average power ratio (PAPR).
William Shieh, Yan Tang
doaj   +1 more source

Multi‐Dimensional Physical‐Layer Security via Digitally Mediated Space–Time Modulation

Advanced Science, EarlyView.
Digitally mediated space–time modulation moves radiation control beyond hardware‐bound switching. Multiple information‐bearing and masking waveforms are jointly synthesized at baseband and coherently coupled to simple periodic time modulation, enabling programmable, independently directed multi‐beam radiation without increasing switching‐state ...
Kejin Chen, Heng Mao, Feng Yang, Gengbo Wu, Lei Zhang, Yikai Chen, Shi‐Wei Qu, Jun Hu, Shiwen Yang   +8 more
wiley   +1 more source

Adaptive Optimization of Quantized Perturbation Coefficients for Fiber Nonlinearity Compensation

IEEE Photonics Journal, 2016
In the perturbation-based nonlinearity compensation (PB-NLC) technique, quantization of perturbation coefficients is employed for reduction of computational and implementation complexity.
M. Malekiha, D. V. Plant
doaj   +1 more source

Coherent terahertz radiation with 2.8-octave tunability through chip-scale photomixed microresonator optical parametric oscillation

Nature Communications, 2022
High-spectral-purity frequency-agile room-temperature THz sources are foundational elements for imaging, sensing, metrology, and communications. Here a parametric oscillator-photomixer chip with coherent 2.8-octave tunable THz radiation is achieved.
Wenting Wang, Ping-Keng Lu, Abhinav Kumar Vinod, Deniz Turan, James F. McMillan, Hao Liu, Mingbin Yu, Dim-Lee Kwong, Mona Jarrahi, Chee Wei Wong   +9 more
doaj   +1 more source

Influence of Atmospheric Turbulence on Coherent Free-Space Optical Communications

The development of coherent free-space optical communications systems could provide an opportunity for significantly increased data rates compared to the traditional intensity-modulation-based communications.
Bellossi, Raphaël, McDonald, Douglas, Gładysz, Szymon   +2 more
core   +1 more source

scGEN: Leveraging an Adaptive Weighting Strategy for Challenging Cell Clustering in Single‐Cell RNA‐seq

Advanced Science, EarlyView.
scGEN combines attribute–structure encoding, adaptive hard‐sample weighting, and regularized zero‐inflated negative binomial loss to resolve ambiguous single‐cell states. In the developing human pituitary, refined annotations reveal Pre.Gonado cells at 7 weeks and previously obscured developmental communication networks.
Fang Huang, Dayu Hu, Yaqi Dai, Aoyi Geng, Renxiang Guan, Hao Quan, Brett A. McGregor, Zhihan Wang, Nadeem Khan, Hongsheng Zhang, Jinghua Zhang, Mingyang Xia, Xiaoqiong Gu, Di Che, Junguk Hur, Xiaoyu Cui, Kai Guo   +16 more
wiley   +1 more source

Information Spectral Efficiency and Launch Power Density Limits Due to Fiber Nonlinearity for Coherent Optical OFDM Systems

IEEE Photonics Journal, 2011
We derive closed-form expressions for nonlinear transmission performance of dual-polarization closely spaced coherent optical orthogonal frequency-division multiplexing (CO-OFDM) systems. We find that the fiber nonlinear noise exhibits a signature of the
William Shieh, Xi Chen
doaj   +1 more source

Full-duplex quantum coherent communication [PDF]

2019 21st International Conference on Transparent Optical Networks (ICTON), 2019
High bandwidth requirements for data communications are currently being met by classical coherent communication using multi-level modulation of amplitude and phase of light. Alternatively, down at the level of quantum signals, coherent communication enables establishment of cryptographic keys between two legitimate users, and shows higher key exchange ...
Kumar, Rupesh, Spiller, Tim
openaire   +3 more sources

Coherent Modulation for Free-Space Optical Communications: Impact of Turbulence and Link Optimization

The performance of coherent free-space optical (FSO) communications systems is degraded by the adverse effects of atmospheric turbulence. We review the impact of atmospheric turbulence on coherent FSO through simulation and experiment, as well as discuss
Gladysz, Szymon, McDonald, Douglas, Bellossi, Raphael   +2 more
core   +1 more source