Results 41 to 50 of about 145,983 (280)

Single Image Signal-to-Noise Ratio (SNR) Estimation Techniques for Scanning Electron Microscope: A Review

IEEE Access
Noises are commonly present in grayscale images, particularly in Scanning Electron Microscope (SEM) images especially secondary emission noise, which can significantly affect their quality.
Dominic Chee Yong Ong, Kok Swee Sim
doaj   +1 more source

Optimal Power Allocation for Channel Estimation in MIMO-OFDM System with Per-Subcarrier Transmit Antenna Selection [PDF]

, 2015
A novel hybrid channel estimator is proposed for multiple-input multiple-output orthogonal frequency- division multiplexing (MIMO-OFDM) system with per-subcarrier transmit antenna selection having optimal power allocation among subcarriers.
Rajeswari, K., Thiruvengadam, S. J.
core   +2 more sources

Association of Corticospinal Tract Asymmetry With Ambulatory Ability After Intracerebral Hemorrhage

Annals of Clinical and Translational Neurology, EarlyView.
ABSTRACT Background Ambulatory ability after intracerebral hemorrhage (ICH) is important to patients. We tested whether asymmetry between ipsi‐ and contra‐lesional corticospinal tracts (CSTs) assessed by diffusion tensor imaging (DTI) is associated with post‐ICH ambulation.
Yasmin N. Aziz, Carl D. Langefeld, Mary E. Comeau, Miranda C. Marion, Tyler P. Behymer, Lee A. Gilkerson, Padmini Sekar, Weihong Yuan, Vivek Khandwala, Brady J. Williamson, Thomas Maloney, Achala Vagal, Pierce Boyne, Kari Dunning, Matthew L. Flaherty, Steven J. Kittner, Prachi Mehndiratta, Gunjan Y. Parikh, Michael L. James, David Roh, Fernando D. Testai, Farhaan S. Vahidy, James Thornton, Ranjit Bagga, Daniel Woo, Stacie L. Demel   +25 more
wiley   +1 more source

Signal-to-noise ratio estimation for M-QAM signals in η−μand κ−μfading channels

EURASIP Journal on Advances in Signal Processing, 2019
In this paper, signal-to-noise ratio (SNR) estimation is carried out by the method of moments (MOM) for fading channels modeled by probability distributions η−μ and κ−μ, considering M-ary quadrature amplitude modulation (M-QAM) with constellation energy ...
Wamberto José Lira de Queiroz, Danilo Brito Teixeira de Almeida, Francisco Madeiro, Waslon Terllizzie Araújo Lopes   +3 more
doaj   +1 more source

NDA Waveform Estimation in the Low-SNR Regime [PDF]

IEEE Transactions on Signal Processing, 2007
This correspondence addresses the problem of nondata-aided waveform estimation for digital communications. Based on the unconditional maximum likelihood criterion, the main contribution of this correspondence is the derivation of a closed-form solution to the waveform estimation problem in the low signal-to-noise ratio regime.
López Salcedo, José Antonio, Vázquez Grau, Gregorio   +1 more
openaire   +2 more sources

Functional Connectivity Linked to Cognitive Recovery After Minor Stroke

Annals of Clinical and Translational Neurology, EarlyView.
ABSTRACT Objective Patients with minor stroke exhibit slowed processing speed and generalized alterations in functional connectivity involving frontoparietal cortex (FPC). The pattern of connectivity evolves over time. In this study, we examine the relationship of functional connectivity patterns to cognitive performance, to determine ...
Vrishab Commuri, Isabella Dallasta, Ciaran Stone, Sophia Girgenti, Neda Gould, Rafael H. Llinas, Jonathan Z. Simon, Elisabeth Breese Marsh   +7 more
wiley   +1 more source

Relay Assisted Cooperative OSTBC Communication with SNR Imbalance and Channel Estimation Errors

, 2009
In this paper, a two-hop relay assisted cooperative Orthogonal Space-Time Block Codes (OSTBC) transmission scheme is considered for the downlink communication of a cellular system, where the base station (BS) and the relay station (RS) cooperate and ...
Beluri, Mihaela C., Chitrapu, Prabhakar, Lin, Zinan, Niu, Bo   +3 more
core   +1 more source

Brainstem and Cerebellar Volume Loss and Associated Clinical Features in Progressive Supranuclear Palsy

Annals of Clinical and Translational Neurology, EarlyView.
ABSTRACT Introduction Progressive Supranuclear Palsy (PSP) is a neurodegenerative ‘tauopathy’ with predominating pathology in the basal ganglia and midbrain. Caudal tau spread frequently implicates the cerebellum; however, the pattern of atrophy remains equivocal.
Chloe Spiegel, Timothy P. Siejka, Cassandra Marotta, Josh J. Y. Lee, Kelly Bertram, Terence J. O'Brien, Meng Law, Lucy Vivash, Ian H. Harding   +8 more
wiley   +1 more source

Secret Key Generation Based on AoA Estimation for Low SNR Conditions

, 2014
In the context of physical layer security, a physical layer characteristic is used as a common source of randomness to generate the secret key. Therefore an accurate estimation of this characteristic is the core for reliable secret key generation ...
Badawy, Ahmed, Chiasserini, Carla-Fabiana, Elfouly, Tarek, Khattab, Tamer, Mohamed, Amr, Trinchero, Daniele   +5 more
core   +1 more source

Application of asymptotic expansions of maximum likelihood estimators errors to gravitational waves from binary mergers: the single interferometer case [PDF]

, 2010
In this paper we describe a new methodology to calculate analytically the error for a maximum likelihood estimate (MLE) for physical parameters from Gravitational wave signals.
A. Thode, D. N. Lawley, F. Acernese, Haldane, L. Blanchet, L. R. Shenton, L. R. Shenton, L. R. Shenton, L. R. Shenton, L. S. Finn, M. Zanolin, M. S. Bartlett, M. S. Bartlett, N. Makris, O. E. Barndoff-Nielsen, O. E. Barndoff-Nielsen, O. E. Barndoff-Nielsen, P. McCullagh, S. Vitale   +18 more
core   +3 more sources