Results 11 to 20 of about 843,694 (188)
A Fast and High-Precision Satellite-Ground Synchronization Technology in Satellite Beam Hopping Communication [PDF]
Space: Science & TechnologyA key requirement for future multibeam broadband satellite communication systems is the ability to flexibly adjust beam capacity according to changes in business distribution, in order to meet time-varying business requirements.
Tengfei Hui +6 more
doaj +3 more sources
Blind Joint Soft-Detection Assisted Slow Frequency-Hopping Multicarrier DS-CDMA [PDF]
, 2000 A novel multiple-access scheme based on slow frequency-hopping multicarrier direct-sequence, code-division multiple access (SFH/MC DS-CDMA) is proposed and investigated, which can be rendered compatible with the existing second-generation narrow-band ...
Yang, L-L., Hanzo, L.
core +2 more sources
Multi-group frequency hopping OFDMA based on statistical multiplexing [PDF]
, 2008 In this paper, the multi-group frequency hopping OFDMA (MG-FH OFDMA) based on the statistical multiplexing is proposed for the downlink cellular system. Compared with the existed random frequency hopping OFDMA (RFH-OFDMA) system utilizing the statistical
Su, Xinghui +9 more
core +1 more source
Bit error simulation of DQPSK for a slow frequency hopping CDMA system in mobile radio communications [PDF]
, 1995 Spread spectrum (SS) techniques seem to be an attractive alternative to conventional narrow-band modulation. In this paper a frequency hopping (FH) system model based on slow FH (SFH) is proposed.
Mortazavi, SH +3 more
core +1 more source
Optimization Method of Dynamic Beam Position for LEO Beam-Hopping Satellite Communication Systems
IEEE Access, 2021 The beam-hopping (BH) technology applied to low earth orbit (LEO) satellite communication networks is a superior choice, but the long transmission delay partly caused by data packets waiting in the queue of satellite transponders will seriously affect ...
Jingyu Tang +4 more
doaj +1 more source
IEEE Photonics Journal, 2017 We propose and demonstrate a novel method to generate multispectrum frequency and hopping from one frequency spectrum to another using a single external cavity based Fabry–Pérot laser diode (FP-LD) subjected to a single optical injection ...
Bikash Nakarmi +4 more
doaj +1 more source
Sensors, 2023 This paper examines potential performances of the Spread Spectrum-based random access technique and proposes an Improved Spread Spectrum Aloha (ISSA) protocol for the return channel in satellite Internet of Things (IoT) based on the beam-hopping ...
Liang Gou +3 more
doaj +1 more source
Optimization Method for Full Bandwidth Beam Hopping Pattern Based on Clustering [PDF]
Jisuanji gongcheng, 2020 To solve the problem of the interference in the full bandwidth Beam Hopping(BH) satellite communication system,this paper proposes a BH pattern optimization method based on beam clustering.Slot allocation is made according to the proportion of each beam ...
WANG Yaxin, BIAN Dongming, HU Jing, TANG Jingyu, WANG Chuang
doaj +1 more source
Joint Beam Hopping and Carrier Aggregation in High Throughput Multibeam Satellite Systems
IEEE Access, 2022 Beam hopping (BH) and carrier aggregation (CA) are two promising technologies for the next generation satellite communication systems to achieve several orders of magnitude increase in system capacity and to significantly improve the spectral efficiency.
Mirza Golam Kibria +4 more
doaj +1 more source
Advanced Engineering Materials, EarlyView.Building machine‐readable vocabularies for materials science is slow, expert‐driven work. This study benchmarks 13 large language models on two of its first steps: finding candidate terms in engineering articles and deciding where they belong in a class hierarchy.
Thomas Bjarsch +3 more
wiley +1 more source