Results 11 to 20 of about 2,077,932 (214)
A Survey of Beam Management for mmWave and THz Communications Towards 6G [PDF]
IEEE Communications Surveys and Tutorials, 2023 Communication in millimeter wave (mmWave) and even terahertz (THz) frequency bands is ushering in a new era of wireless communications. Beam management, namely initial access and beam tracking, has been recognized as an essential technique to ensure ...
Qing Xue +6 more
semanticscholar +1 more source
Beam Focusing for Near-Field Multi-User MIMO Communications [PDF]
IEEE Transactions on Wireless Communications, 2021 Large antenna arrays and high-frequency bands are two key features of future wireless communication systems. The combination of large-scale antennas with high transmission frequencies often results in the communicating devices operating in the near-field
Haiyang Zhang +5 more
semanticscholar +1 more source
Fast Near-Field Beam Training for Extremely Large-Scale Array [PDF]
IEEE Wireless Communications Letters, 2022 In this letter, we study efficient near-field beam training design for the extremely large-scale array (XL-array) communication systems. Compared with the conventional far-field beam training method that searches for the best beam direction only, the ...
Yunpu Zhang, Xun Wu, Changsheng You
semanticscholar +1 more source
Near-Field Rainbow: Wideband Beam Training for XL-MIMO [PDF]
IEEE Transactions on Wireless Communications, 2022 Wideband extremely large-scale multiple-input-multiple-output (XL-MIMO) plays an important role in boosting the data rate for 6G networks. Because of the huge bandwidth and the large number of antennas, wideband XL-MIMO introduces a significant near ...
Mingyao Cui +4 more
semanticscholar +1 more source
To beam or not to beam: that is the question [PDF]
Dentomaxillofacial Radiology, 2013 After reading the articles by Lione et al,1,2 I was very upset and concerned about the way the authors intentionally misused ionizing radiation to assess the effectiveness of an orthodontic treatment. Both studies were published at a similar time and cover the same unfortunate 17 pre-pubertal children, who had a mean age of only 11.2 years (range 8–14 ...
Lione,R +4 more
openaire +5 more sources
LiDAR Aided Future Beam Prediction in Real-World Millimeter Wave V2I Communications [PDF]
IEEE Wireless Communications Letters, 2022 This letter presents the first large-scale real-world evaluation for using LiDAR data to guide the mmWave beam prediction task. A machine learning (ML) model that leverages LiDAR sensory data to predict the current and future beams was developed.
Shuaifeng Jiang +2 more
semanticscholar +1 more source
Frictional interactions for non‐localized beam‐to‐beam and beam‐inside‐beam contact [PDF]
International Journal for Numerical Methods in Engineering, 2021 AbstractThis contribution presents the extensions of beam‐to‐beam and beam‐inside‐beam contact schemes of the same authors towards frictional interactions. Since the schemes are based on the beams' true surfaces (instead of surfaces implicitly deduced from the beams' centroid lines), the presented enhancements are not only able to account for ...
Magliulo, Marco +3 more
openaire +2 more sources
Coherent beam-beam tune shift of unsymmetrical beam-beam interactions with large beam-beam parameter [PDF]
Physical Review E, 2005 Coherent beam-beam tune shift of unsymmetrical beam-beam interactions was studied experimentally and numerically in HERA where the lepton beam has a very large beam-beam parameter (up to $ξ_y=0.272$). Unlike the symmetrical case of beam-beam interactions, the ratio of the coherent and incoherent beam-beam tune shift in this unsymmetrical case of beam ...
Jin, Lihui +2 more
openaire +3 more sources
A Tutorial on Beam Management for 3GPP NR at mmWave Frequencies [PDF]
IEEE Communications Surveys and Tutorials, 2018 The millimeter wave (mmWave) frequencies offer the availability of huge bandwidths to provide unprecedented data rates to next-generation cellular mobile terminals.
M. Giordani +4 more
semanticscholar +1 more source
The coherent beam-beam interaction [PDF]
Conference Record of the 1991 IEEE Particle Accelerator Conference, 2002 The authors present the results of a new beam-beam simulation program that allows for a self-consistent calculation of the electromagnetic fields of the beams by treating general (non-Gaussian) beam distributions. The simulation program calculates the fields from the coordinates of the test-particles, and does not impose any restrictions on the beam ...
Krishnagopal, S., Siemann, R.H.
openaire +2 more sources