Results 151 to 160 of about 5,110,902 (386)
, 2009 Channel Estimation is an essential component in applications such as radar and data communication. In multi path time varying environments, it is necessary to estimate time-shifts, scale-shifts (the wideband equivalent of Doppler-shifts), and the gains/phases of each of the multiple paths.
openaire +2 more sources
Energy dependence of the GAFCHROMIC LD‐V1 in the diagnostic radiographic modalities
Journal of Applied Clinical Medical Physics, EarlyView.Abstract The GAFCHROMIC LD‐V1 radiochromic film is widely used in dosimetry because it can provide high‐resolution two‐dimensional dose distributions without processing. This study aimed to evaluate the response characteristics at different effective energies, from the low‐energy range of mammography to the high‐energy range of computed tomography. Net
Tatsuhiro Gotanda +9 more
wiley +1 more source
Journal of Applied Clinical Medical Physics, EarlyView.Abstract Purpose The aim of this work was to report on the optimization, commissioning, and validation of a beam model using a commercial independent dose verification software RadCalc version 7.2 (Lifeline Software Inc, Tyler, TX, USA), along with 4 years of experience employing RadCalc for offline and online monitor unit (MU) verification on the ...
Urszula Jelen +3 more
wiley +1 more source
High-Speed Railway, 2023 With the development of High-Speed Rail (HSR), countries and individual passengers alike have enjoyed far ranging benefits as a result – economic, social, environment and in added convenience.
Xuying Chen +4 more
doaj
Entropy, 2016 A robust sparse least-mean mixture-norm (LMMN) algorithm is proposed, and its performance is appraised in the context of estimating a broadband multi-path wireless channel.
Yingsong Li +3 more
doaj +1 more source
Piecewise Beam Training and Channel Estimation for RIS-Aided Near-Field Communications [PDF]
arXivIn this paper, we investigate the channel estimation challenge in reconfigurable intelligent surface (RIS)-aided near-field communication systems. Current channel estimation techniques require substantial pilot overhead and computational complexity, especially when the number of RIS elements is extremely large. To address this issue, we introduce a two-
arxiv
Estimation of roughness coefficients for natural stream channels with vegetated banks [PDF]
, 1998 William F. Coon
openalex +1 more source
A Discriminatory Channel Estimation Scheme Based on the Aid of Friendly Jammer
Dianxin kexue, 2015 In the physical layer security,that inhibiting the accuracy of channel estimation at eavesdropper can indirectly enhance the received signal quality difference between the legitimate receiver and the eavesdropper,thus improving signal transmission ...
Rong Zhang, Xianzhong Xie, Weijia Lei
doaj +2 more sources
Annals of Clinical and Translational Neurology, EarlyView.Abstract Objective Exploring the prevalence and association between intracranial atherosclerosis (ICAS) and cerebral small vessel diseases (CSVD), this study delved beyond the current scope, utilising high‐resolution vessel wall MRI (HRVW‐MRI) to investigate how subtle changes in intracranial atherosclerotic features influence the various burdens of ...
Joseph Amihere Ackah +6 more
wiley +1 more source
Beamspace Channel Estimation for Millimeter-Wave Massive MIMO Systems with Lens Antenna Array [PDF]
arXiv, 2016 By employing the lens antenna array, beamspace MIMO can utilize beam selection to reduce the number of required RF chains in mmWave massive MIMO systems without obvious performance loss. However, to achieve the capacityapproaching performance, beam selection requires the accurate information of beamspace channel of large size, which is challenging ...
arxiv