Results 61 to 70 of about 36,429 (287)

Enhanced Signal-to-Noise Ratio Estimation in Optical Fiber Communications: A Pilot-Based Approach

IEEE Open Journal of the Communications Society
This paper presents two innovative, pilot-assisted, neural network (NN)-based signal-to-noise ratio (SNR) estimators for application in optical fiber communications.
Mohamed Al-Nahhal, Ibrahim Al-Nahhal, Sunish Kumar Orappanpara Soman, Octavia A. Dobre   +3 more
doaj   +1 more source

High-Accuracy and Low-Complexity DOA Estimation Algorithm for Transmit-Only Diversity Bistatic MIMO Radar

IEEE Access, 2019
This paper proposes TOD-MUSIC algorithm to improve the Direction of Arrival (DOA) estimation accuracy under low Signal-to-Noise Ratio (SNR) in transmit-only diversity bistatic Multiple-Input Multiple-Output (MIMO) radar.
Xiaoping Zeng, Guanghui Chen, Shuang Jiao, Shu Fu, Li Dong   +4 more
doaj   +1 more source

Direct Measurement of the Singlet Lifetime and Photoexcitation Behavior of the Boron Vacancy Center in Hexagonal Boron Nitride

Advanced Optical Materials, EarlyView.
Negatively charged boron vacancy defects in hexagonal boron nitride promise near‐surface quantum sensing, but their internal spin transition rates are only partly understood. This work directly measures the defect's singlet‐state lifetime, 15(3) ns, using a nanosecond rise‐time dual‐pulse photoluminescence‐recovery method, and shows that high laser ...
Richard A. Escalante, Andrew J. Beling, Daniel G. Ang, Niko R. Reed, Justin J. Welter, John W. Blanchard, Cecilia Campos, Edwin Coronel, Klaus Krambrock, Alexandre S. Leal, Paras N. Prasad, Ronald L. Walsworth   +11 more
wiley   +1 more source

Comparison of CS-Based Channel Estimation for Millimeter Wave Massive MIMO Systems

Applied Sciences, 2019
Compressed sensing (CS) has great potential in channel estimation for millimeter wave (mmWave) massive multiple-input multiple-output (MIMO) systems.
Xingbo Lu, Weiwei Yang, Yueming Cai, Xinrong Guan   +3 more
doaj   +1 more source

On Determination Method for Resolution of Secondary Electron Images in Scanning Electron Microscopy

Advanced Science, EarlyView.
An idealized SEM, termed Rayleigh's microscope, is constructed by Monte Carlo simulation to represent imaging conditions that just satisfy the Rayleigh criterion. Based on this physically defined model, sharpness–resolution conversion curves are established and combined with the Rose criterion, enabling automated resolution evaluation from practical ...
Tongfang Yang, Yanbo Zou, Zejun Ding
wiley   +1 more source

A Deep Learning Approach for Direction-of-Arrival Estimation in Low-SNR Environments

Applied Sciences
To address the significant performance degradation of traditional direction-of-arrival (DOA) estimation algorithms under low-signal-to-noise ratio (SNR) conditions, this paper proposes a deep learning-based super-resolution DOA estimation network (DSDE ...
Haiqin Zhao, Jian Gong, Changlin Zhou
doaj   +1 more source

SNR wall for energy detection with noise power estimation

, 2011
In this work we perform an asymptotic analysis of estimated noise power (ENP) energy detector (ED) to derive the condition for the existence of the signal-to-noise ratio (SNR) wall phenomenon.
Marco Chiani, GIORGETTI, ANDREA, CHIANI, MARCO, MARIANI, ANDREA, Andrea Giorgetti, Andrea Mariani   +5 more
core   +1 more source

MSE lower bounds conditioned by the energy detector [PDF]

, 2007
A wide variety of processing incorporates a binary detection test that restricts the set of observations for parameter estimation. This statistical conditioning must be taken into account to compute the Cramer-Rao bound (CRB) and more generally, lower ...
Chaumette, Eric, Renaux, Alexandre, Galy, J., Larzabal, Pascal, Galy, Jerome, Larzabal, P., Vincent, François   +6 more
core   +1 more source

A Toolkit for Targeted Neuromodulation of Striatal Direct Pathway Neurons Rescues Parkinsonian Motor Deficits in Mice

Advanced Science, EarlyView.
An adeno‐associated virus (AAV) toolkit enables selective anatomical and functional targeting of striatal D1‐MSNs through retrograde transduction. Enhanced capsids and engineered enhancers drive robust transgene expression across murine and primate models.
Zexuan Hong, Yujing Zhang, Junjiao Zhang, Hanhe Liu, Qiwei Liu, Yanglei Li, Lixin Yang, Lixia Li, Zhongjie Liu, Zhen Yuan, Zhonghua Lu, Yefei Chen, Yuantao Li, Yuwu Jiang, Taian Liu   +14 more
wiley   +1 more source

Direction of Arrival Estimation Using Two Hydrophones: Frequency Diversity Technique for Passive Sonar

Sensors, 2019
The traditional passive azimuth estimation algorithm using two hydrophones, such as cross-correlation time-delay estimation and cross-spectral phase estimation, requires a high signal-to-noise ratio (SNR) to ensure the clarity of the estimated target ...
Peng Li, Xinhua Zhang, Wenlong Zhang
doaj   +1 more source