Development of highly maintainable and reliable RF transceiver for satellite base stations [International Communications Satellite Systems Conference]

2019 ◽  
Author(s):  
M. Matsui ◽  
A. Matsushita ◽  
F. Yamashita
Keyword(s):  
Base Stations ◽  
Rf Transceiver ◽  
Satellite Systems

scholarly journals Analysis of the Effect of Different Combinations of Observation Satellites on the Resolving Accuracy of GNSS Observation Data

2020 ◽  
Vol 206 ◽  
pp. 03025
Author(s):  
Junze Wang ◽  
Maohua Yao ◽  
Wenting Zhou ◽  
Xiangping Chen
Keyword(s):  
Measurement Accuracy ◽  
Control Point ◽  
Satellite System ◽  
Base Stations ◽  
Observation Data ◽  
Control Points ◽  
Level Control ◽  
Satellite Systems ◽  
Beidou Navigation Satellite System ◽  
Stable Measurement

In this paper, 24 C-level control points under different terrain conditions were selected to be the testing points. The binary-satellite system (GPS+GLONASS) and the triple-satellite system with BeiDou Navigation Satellite System (BDS) (BDS+GPS+GLONASS) were adopted for static measurement; and the observation data from BeiDou Ground-based Augumentation System (GBAS) base stations in Guangxi were collected for solution. By comparing the residuals of GPS tri-dimensional baseline vectors and the internal accord accuracy of each control point under the binary and triple-satellite systems, the effect of data collected by different satellite systems under different terrain conditions on measurement accuracy was studied. According to the results, (1) the triple-satellite system with BDS showed more stable measurement accuracy; (2) in plane, the two systems were of equivalent measurement accuracy in mountainous and flat areas; in elevation, the triple-satellite system showed higher and more stable measurement accuracy.

5G Systems and Packaging Opportunities

2018 ◽  
Vol 2018 (1) ◽  
pp. 000233-000237
Author(s):  
Rick Sturdivant
Keyword(s):  
Mobile Phones ◽  
Additional Data ◽  
Phased Arrays ◽  
User Equipment ◽  
Base Stations ◽  
3D Integration ◽  
Satellite Systems ◽  
Or Groups ◽  
5G Systems ◽  
Alternative Solutions

Abstract 5G systems are being developed to meet the ever increasing desire for additional data bandwidth in mobile devices. Two enabling technologies for these systems are millimeter-wave electronics and phased arrays. Phased arrays have traditionally been used on military radar and satellite systems. However, they provide the capability to direct communication antenna beams directly to users or groups of users. In fact, standards committees agree that all network elements (including base stations, Access Points, and User Equipment) will be equipped with directional steerable antennas and can direct their beams in specific directions. In other words, phased arrays will be deployed at a variety of points in the 5G system even down to user equipment such as mobile phones, tablets, and lap tops. However, the components and modules used in 5G systems come with their unique packaging challenges. Those challenges will be described and some solutions will be given. 5G systems alternatives will also be described based on several architectures that are available for phased arrays. The two main reasons they are a challenge to package will be described. Several alternative solutions including heterogeneous packaging and 3D integration are described.

scholarly journals Comparison of precipitable water over Ghana using GPS signals and reanalysis products

2015 ◽  
Vol 5 (1) ◽  
Author(s):  
A. A. Acheampong ◽  
C. Fosu ◽  
L. K. Amekudzi ◽  
E. Kaas
Keyword(s):  
Water Vapour ◽  
Meteorological Parameters ◽  
Correlation Coefficients ◽  
Precipitable Water ◽  
Reanalysis Data ◽  
Base Station ◽  
Base Stations ◽  
Satellite Systems ◽  
Location Map ◽  
Troposphere Delays

AbstractSignals from Global Navigational Satellite Systems (GNSS) when integrated with surface meteorological parameters can be used to sense atmospheric water vapour. Using gLAB software and employing precise point positioning techniques, zenith troposphere delays (ZTD) for a GPS base station at KNUST, Kumasi have been computed and used to retrieve Precipitable Water (PW). The PW values obtained were compared with products from ERA-Interim and NCEP reanalysis data. The correlation coefficients, r, determined from these comparisons were 0.839 and 0.729 for ERA-interim and NCEP respectively. This study has demonstrated that water vapour can be retrieved with high precision from GNSS signal. Furthermore, a location map have been produced to serve as a guide in adopting and installing GNSS base stations in Ghana to achieve a country wide coverage of GNSS based water vapour monitoring.

A 65nm CMOS 2×2 MIMO multi-band LTE RF transceiver for small cell base stations

2017 ◽  
Author(s):  
Kyoohyun Lim ◽  
Sanghoon Lee ◽  
Byeongmoo Moon ◽  
Hwahyeong Shin ◽  
Kisub Kang ◽  
...  
Keyword(s):  
Small Cell ◽  
Base Stations ◽  
Rf Transceiver ◽  
Cell Base ◽  
Multi Band

scholarly journals netBaltic System – Heterogeneous Wireless Network for Maritime Communications

2018 ◽  
Vol 25 (2) ◽  
pp. 14-26
Author(s):  
Michał Hoeft ◽  
Krzysztof Gierłowski ◽  
Jacek Rak ◽  
Józef Woźniak
Keyword(s):  
Wireless Communication ◽  
Information Exchange ◽  
Communication Systems ◽  
Wireless Systems ◽  
Base Stations ◽  
Wide Audience ◽  
Satellite Systems ◽  
Node Architecture ◽  
Maritime Communication ◽  
Maritime Environment

Abstract In case of maritime communications, we observe a growing interest in deployment of multitask satellite-based solutions and development of new maritime-specific systems intended for improvements in safety of e-navigation. Analysis of different types of currently used maritime communication systems leads, however, to a conclusion that neither global and still very expensive satellite systems nor cheaper, but short-ranged transmission technologies can, on their own, fully meet the today’s expectations and quality requirements formulated for broadband maritime systems. This lack of reliable solutions, offering high throughput and ubiquitous availability of coverage to a wide audience at a relatively low price is one of the main barriers in a widespread implementation of e-navigation initiatives. This issue is addressed in the netBaltic project with the objective to design, deploy and validate in a real maritime environment a non-satellite wireless communication system enabling ship-to-ship and ship-to-shore information exchange via a multi-hop network composed of onshore base stations, maritime vessels and other transit elements such as buoys. In this paper, the idea of a heterogeneous wireless maritime system is presented. Details of the proposed netBaltic node architecture are described highlighting the solutions introduced in the project as a response to specific maritime communication requirements. Numerical results of communication area coverage are presented for four different scenarios utilizing different wireless transmission technologies. In particular, they indicate that when using appropriate wireless communication solutions, the number of vessels being able to connect to Internet is significantly increased as compared to traditional wireless systems (capable of one-hop communication) from 14% for short-range transmission technologies up to as high as 127% in case when relatively long-range transmission technologies are employed within the system.

scholarly journals UWB Base Station Cluster Localization for Unmanned Ground Vehicle Guidance

2021 ◽  
Vol 2021 ◽  
pp. 1-23
Author(s):  
Yuzhan Wu ◽  
Susheng Ding ◽  
Yuanhao Ding ◽  
Meng Li
Keyword(s):  
Base Station ◽  
Global Navigation Satellite Systems ◽  
Base Stations ◽  
Unmanned Ground Vehicles ◽  
Ground Vehicles ◽  
Satellite Systems ◽  
Area Of Interest ◽  
Narrow Road ◽  
Global Navigation Satellite ◽  
Station Cluster

In this paper, we seek to provide unmanned ground vehicles with positioning service using ultrawideband (UWB) technology, a high-accuracy positioning approach. UWB is chosen for two distinct reasons. First, it does not rely on global navigation satellite systems like GPS, making it able to be applied indoors or in an environment where GPS signal is unstable. Second, it is immune to interference from other signals and accurate enough to guide unmanned ground vehicles moving precisely in a complex environment within a narrow road. In this paper, three UWB base stations are aggregated as a group in a 2D space for localization. A large number of tests are performed with a UWB base station cluster in order to validate its positioning performance. Based on the experiment results, we further develop a dynamic particle swarm optimization-based algorithm and a genetic algorithm to deploy multiple clusters of UWB base stations to cover an area of interest. The performance of the proposed algorithms has been tested through a series of simulations. Finally, experiments using unmanned ground vehicles are carried out to validate the localization performance. The results confirm that the robots can follow complex paths accurately with the proposed UWB-based positioning system.

scholarly journals Methodology for Simulating 5G and GNSS High-Accuracy Positioning

Sensors ◽  
2018 ◽  
Vol 18 (10) ◽  
pp. 3220 ◽  
Author(s):  
José del Peral-Rosado ◽  
Jani Saloranta ◽  
Giuseppe Destino ◽  
José López-Salcedo ◽  
Gonzalo Seco-Granados
Keyword(s):  
High Accuracy ◽  
Urban Environments ◽  
Global Navigation Satellite Systems ◽  
Base Stations ◽  
Line Of Sight ◽  
Millimetre Wave ◽  
Localization Accuracy ◽  
Satellite Systems ◽  
Hybrid Positioning ◽  
Global Navigation Satellite

This paper focuses on the exploitation of fifth generation (5G) centimetre-wave (cmWave) and millimetre-wave (mmWave) transmissions for high-accuracy positioning, in order to complement the availability of Global Navigation Satellite Systems (GNSS) in harsh environments, such as urban canyons. Our goal is to present a representative methodology to simulate and assess their hybrid positioning capabilities over outdoor urban, suburban and rural scenarios. A novel scenario definition is proposed to integrate the network density of 5G deployments with the visibility masks of GNSS satellites, which helps to generate correlated scenarios of both technologies. Then, a generic and representative modeling of the 5G and GNSS observables is presented for snapshot positioning, which is suitable for standard protocols. The simulations results indicate that GNSS drives the achievable accuracy of its hybridisation with 5G cmWave, because non-line-of-sight (NLoS) conditions can limit the cmWave localization accuracy to around 20 m. The 5G performance is significantly improved with the use of mmWave positioning with dominant line-of-sight (LoS) conditions, which can even achieve sub-meter localization with one or more base stations. Therefore, these results show that NLoS conditions need to be weighted in 5G localization, in order to complement and outperform GNSS positioning over urban environments.

A 65-nm CMOS $2\times2$ MIMO Multi-Band LTE RF Transceiver for Small Cell Base Stations

2018 ◽  
Vol 53 (7) ◽  
pp. 1960-1976 ◽  
Author(s):  
Kyoohyun Lim ◽  
Sanghoon Lee ◽  
Yongha Lee ◽  
Byeongmoo Moon ◽  
Hwahyeong Shin ◽  
...  
Keyword(s):  
Small Cell ◽  
Base Stations ◽  
Rf Transceiver ◽  
Cell Base ◽  
Multi Band
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