Results 21 to 30 of about 701,425 (185)

A General Model for Pointing Error of High Frequency Directional Antennas

IEEE Open Journal of the Communications Society, 2022
This paper focuses on providing an analytical framework for the quantification and evaluation of the pointing error for a general case at high-frequency millimeter wave (mmWave) and terahertz (THz) communication links.
Mohammad Taghi Dabiri, Mazen Hasna, Nizar Zorba, Tamer Khattab, Khalid A. Qaraqe   +4 more
doaj   +1 more source

A Correction Method of Estimating the Pointing Error for Reflector Antenna

Shock and Vibration, 2018
The pointing error caused by the structural deformation of large reflector antennas has become the most challenging problem of antenna servo control. Especially with the increase of the antenna diameter and the working frequency, environmental loads not ...
Jie Zhang, Jin Huang, Wei Liang, Youran Zhang, Qian Xu, Letian Yi, Congsi Wang   +6 more
doaj   +1 more source

Analysis of Coaxiality Error Induced by the Cube Corner Retro-Reflector Geometrical and Assembly Errors of an Acquisition, Pointing, and Tracking System

Photonics, 2023
Satellite laser communication is a promising technology for the next-generation communication system. Its communication performance is subject to the APT beam-pointing accuracy.
Daquan Li, Zhaoyong Mao, Lijuan Sun, Haifeng Zhang, Furui Zhang   +4 more
doaj   +1 more source

Impact of Finite-Sized Aperture on the Performance of Differential Multihop DF-FSO Network [PDF]

International Journal of Electronics and Telecommunications, 2022
This paper investigates the differential binary modulation for decode-and-forward (DF) based relay-assisted free space optical (FSO) network under the effect of strong atmospheric turbulence together with misalignment error (ME).
Deepti Agarwal, Poonam Yadav
doaj   +1 more source

Corrigendum to "The holomorphic flow of the Riemann Zeta function" [PDF]

, 2007
Theorem 4.5 of [2], describing the topological type of the zeros of the flow s˙ = ζ(s) at reflected points off the critical line, claiming they were the same, contains an error.
Barnett, A. Ross, Broughan, Kevin A.
core   +2 more sources

Intelligent Motion Compensation for Improving the Tracking Performance of Shipborne Phased Array Radar

International Journal of Antennas and Propagation, 2013
The shipborne phased array radar must be able to compensate the ship’s motion and track the maneuvering targets automatically. In this paper, the real-time beam pointing error compensation mechanism of a planar array antenna for ship’s motion is ...
J. Mar, K. C. Tsai, Y. T. Wang, M. B. Basnet   +3 more
doaj   +1 more source

Performance Evaluation of MPPM-Coded Wireless Optical MIMO System with Combined Effects over Correlated Fading Channel

International Journal of Antennas and Propagation, 2020
The performance of wireless optical MIMO system with multiple pulse position modulation (MPPM) over correlated fading channel is investigated. The combined effects of atmospheric attenuation, atmospheric turbulence, and pointing error are taken into ...
Yue Zhang, Huiqin Wang, Minghua Cao, Zhongxian Bao   +3 more
doaj   +1 more source

On the ASER performance of amplify-and-forward relaying MIMO/FSO systems using SC-QAM signals over log-normal and gamma-gamma atmospheric turbulence channels and pointing error impairments

Journal of Information and Telecommunication, 2020
In this work, we analyse pointing error effects on the performance of amplify-and-forward (AF) relaying multiple-input multiple-output (MIMO) free-space optical (FSO) communication system employing sub-carrier quadrature amplitude modulation (SC-QAM ...
Duong Huu Ai, Ha Duyen Trung, Do Trong Tuan   +2 more
doaj   +1 more source

Spectral synthesis in the multiplier algebra of a C_0(X)-algebra [PDF]

, 2014
We are grateful to the referee for a number of helpful comments and for pointing out an error in the original proof of Theorem 3.6.Peer ...
Archbold, Robert J, Somerset, Douglas W. B.   +1 more
core   +1 more source

Periodic template compensation phase feeding method for phased array antenna

IET Microwaves, Antennas & Propagation, 2023
To minimise the beam‐pointing error caused by the digital phase shifter in phased array antenna systems, a periodic template compensation (PTC) phase feeding algorithm is proposed in this study.
Renli Zhang, Nuo Chen, Shuang Qiu, Weixing Sheng   +3 more
doaj   +1 more source