Results 31 to 40 of about 5,337,605 (357)
Semantically Coherent Out-of-Distribution Detection [PDF]
IEEE International Conference on Computer Vision, 2021 Current out-of-distribution (OOD) detection benchmarks are commonly built by defining one dataset as in-distribution (ID) and all others as OOD. However, these benchmarks unfortunately introduce some unwanted and impractical goals, e.g., to perfectly ...
Jingkang Yang +6 more
semanticscholar +1 more source
Performance Analysis of Coherent and Noncoherent Modulation Under I/Q Imbalance Effects
IEEE Access, 2021 In this paper, we investigate the effects of in-phase/quadrature-phase imbalance (IQI) on the performance of different modulation schemes under multipath fading channels.
Bassant Selim +6 more
doaj +1 more source
A self-coherent receiver for detection of PolMUX coherent signals
Optics Express, 2012 A self-coherent receiver capable of demultiplexing PolMUX-signals without an external polarization controller is presented. Training sequences are introduced to estimate the polarization rotation, and a decision feedback recursive algorithm mitigates the random walk of the recovered field.
Li, Jingshi +10 more
openaire +4 more sources
Doppler Wind Lidar From UV to NIR: A Review With Case Study Examples
Frontiers in Remote Sensing, 2022 Doppler wind lidar (DWL) uses the optical Doppler effect to measure atmospheric wind speed with high spatial-temporal resolution and long detection range and has been widely applied in scientific research and engineering applications.
Mingjia Shangguan +7 more
doaj +1 more source
Mitigation of Nonlinear Impairments by Using Support Vector Machine and Nonlinear Volterra Equalizer
Applied Sciences, 2019 A support vector machine (SVM) based detection is applied to different equalization schemes for a data center interconnect link using coherent 64 GBd 64-QAM over 100 km standard single mode fiber (SSMF).
Rebekka Weixer +4 more
doaj +1 more source
IEEE Photonics Journal, 2023 This paper experimentally investigates the perform-ance of free-space optical (FSO) communication based on mode diversity reception (MDR) using nonmode selective photonic lantern (NSPL) and equal gain combining (EGC).
Feng Wang +3 more
doaj +1 more source
Multiple-Symbol Differential Sphere Detection Aided Differential Space-Time Block Codes Using QAM Constellations [PDF]
, 2011 We propose Multiple-Symbol Differential Detection (MSDD) aided Differential Space-Time Block Codes (DSTBCs) using QAM. Our solution eliminates the requirement of high-complexity MIMO channel estimation and its pilot overhead, while mitigating the ...
Wang, Li +7 more
core +1 more source
IEEE Photonics Journal, 2018 Digital coherent receivers employing Alamouti-coding are a promising solution for passive optical networks (PON) with downstream rates of 100 Gb/s/$\lambda$ . To reduce the cost by utilizing high-volume photodiodes designed for 25 Gb/s data-
Md. Saifuddin Faruk +2 more
doaj +1 more source
Portable Pulsed Coherent Lidar for Noncooperation Targets at the Few-Photon Level
Sensors, 2021 The decoherence in coherent lidar becomes serious with the increase in distance. A small laser spot can suppress the decoherence of the echo light from noncooperation targets. However, it is very difficult to keep a small light spot over a long distance.
Chengkai Pang +3 more
doaj +1 more source
Digital self-coherent detection
Optics Express, 2008 We review recent progresses on digital self-coherent detection of differential phase-shift keyed (DPSK) signal using orthogonal differential direct detection followed by high-speed analog-to-digital conversion and digital signal processing (DSP). Techniques such as data-aided multisymbol phase estimation for receiver sensitivity enhancement, unified ...
Xiang, Liu +2 more
openaire +2 more sources