Results 51 to 60 of about 11,447 (223)

An Empirical Study on Channel Reciprocity in TDD and FDD Systems

IEEE Open Journal of Vehicular Technology
The 6 GHz band plays a crucial role in the development of the 6G. A profound comprehension of channel reciprocity is essential for designing time division duplexing/frequency division duplexing (TDD/FDD) systems within this band.
Huixin Xu, Jianhua Zhang, Pan Tang, Lei Tian, Qixing Wang, Guangyi Liu   +5 more
semanticscholar   +1 more source

Advances in Fault Detection and Diagnosis for Thermal Power Plants: A Review of Intelligent Techniques

Mathematics, 2023
Thermal power plants (TPPs) are critical to supplying energy to society, and ensuring their safe and efficient operation is a top priority. To minimize maintenance shutdowns and costs, modern TPPs have adopted advanced fault detection and diagnosis (FDD)
Salman Khalid, Jinwoo Song, Izaz Raouf, Heung Soo Kim   +3 more
doaj   +1 more source

Fault Detection and Diagnosis in Multi-Robot Systems: A Survey

Sensors, 2019
The use of robots has increased significantly in the recent years; rapidly expending to numerous applications. These sophisticated machines are susceptible to different types of faults that might endanger the robot or its surroundings.
Eliahu Khalastchi, Meir Kalech
doaj   +1 more source

FDD Massive MIMO Uplink and Downlink Channel Reciprocity Properties: Full or Partial Reciprocity? [PDF]

Global Communications Conference, 2019
One challenge for FDD massive MIMO communication system is how to obtain the downlink channel state information (CSI) at the base station. Except for traditional codebook feedback through uplink pilot transmission, some channel reciprocity properties can
Zhimeng Zhong, Li Fan, Shibin Ge
semanticscholar   +1 more source

Cluster Extrapolation for FDD Downlink MIMO Precoding [PDF]

2020 IEEE 31st Annual International Symposium on Personal, Indoor and Mobile Radio Communications, 2020
Channel extrapolation is a promising technique to estimate the Channel State Information (CSI) in multi-input-multi-output (MIMO) systems operating in frequency division duplex (FDD) without relying on costly terminal feedback. In this paper we analyze the limits that can achieve the extrapolation of the frequency response of a propagation channel from
Matthieu Roy, Stéphane Paquelet, Matthieu Crussière   +2 more
openaire   +1 more source

Strong Coupling in all‐Polymer Planar Microcavities

Advanced Optical Materials, EarlyView.
Strong Coupling has been achieved in an all‐polymer microcavity with dielectric contrast Δn = 0.33 doped with TDBC. A Rabi splitting of 39 meV has been measured opening novel perspectives for polymer photonics. ABSTRACT In this work, strong coupling effect is observed in all‐polymer planar microcavities incorporating TDBC J‐aggregates dispersed into ...
Daniela Di Fonzo, Andrea Lanfranchi, Giovanni Manfredi, Maddalena Patrini, Paola Lova, Davide Comoretto   +5 more
wiley   +1 more source

FDD Massive MIMO via UL/DL Channel Covariance Extrapolation and Active Channel Sparsification [PDF]

IEEE Transactions on Wireless Communications, 2018
We propose a novel method for massive multiple-input multiple-output (massive MIMO) in frequency division duplexing (FDD) systems. Due to the large frequency separation between uplink (UL) and downlink (DL) in FDD systems, channel reciprocity does not ...
Mahdi Barzegar Khalilsarai, Saeid Haghighatshoar, Xinping Yi, G. Caire   +3 more
semanticscholar   +1 more source

Neuroanatomical diversity in Teleocichla with new volumetric and histological insights into the encephalon of Teleocichla monogramma Kullander 1988

The Anatomical Record, EarlyView.
Abstract Teleocichla comprises small cichlids that inhabit the rapid streams of Amazonian rivers; however, there has been limited research on their encephalon morphology. This study examined the neuroanatomy of four species, focusing on volumetric measurements of their encephalon subregions, and providing a histological description of the encephalon of
Renan Leão‐Reis, Keila Xavier Magalhães, Thiago Nilton A. Pereira, Janice Muriel‐Cunha, Alberto Akama   +4 more
wiley   +1 more source

Flow-diverting devices in the treatment of unruptured ophthalmic segment aneurysms at a mean clinical follow-up of 5 years

Scientific Reports, 2021
A shift toward the endovascular treatment of ophthalmic segment aneurysms is noticeable. However, it is not clear if the long-term treatment results improve with the development of endovascular methods.
Przemysław Kunert, Katarzyna Wójtowicz, Jarosław Żyłkowski, Maciej Jaworski, Daniel Rabczenko, Jakub Wojciechowski, Kamil Leśniewski, Andrzej Marchel   +7 more
doaj   +1 more source

Channel Estimation for TDD/FDD Massive MIMO Systems With Channel Covariance Computing [PDF]

IEEE Transactions on Wireless Communications, 2017
In this paper, we propose a new channel estimation scheme for TDD/FDD massive MIMO systems by reconstructing (sometimes also referred to as covariance computing or covariance fitting) uplink/downlink channel covariance matrices (CCMs) with the aid of ...
Hongxiang Xie, F. Gao, Shi Jin, Jun Fang, Ying-Chang Liang   +4 more
semanticscholar   +1 more source