scholarly journals SIMULATION Wi-Fi NETWORK WITH WIRELESS DISTRIBUTION SYSTEM (WDS) TOPOLOGY

2017 ◽  
Vol 16 (5) ◽  
pp. 6920-6925
Author(s):  
Rohmat Tulloh ◽  
Hasanah Putri ◽  
Dwi Andi Nurmantris ◽  
Desi Dwi Prihatin
Keyword(s):  
Distribution System ◽  
Wireless Lan ◽  
Access Point ◽  
Wireless Internet ◽  
Network Resources ◽  
Measurement Results ◽  
Policy Models ◽  
Point To Point ◽  
Better Than ◽  
Internet Network

At present, the need for internet access in public area using wireless connections is increasing drastically and this should be supported by good network infrastructure. Wireless network is one of the best alternative in building a practical internet network. WDS is a system to develop wireless internet network without having to use cable as its backbone for access point but instead utilize wireless path from its access point. The problems that often arise in the design of wireless LAN network is the poor signal received by the user due to the installation of an access point that is poor location-wise. This is because at some point it is very difficult to install Access point using cable because the distance is too far from the existing router. In this paper, we propose to use three scenario of WDS mode to compare its performance. We investigate three different topology policy models of the WDS Bridge point-to-point, WDS Bridge point to multipoint and WDS repeater. The use of these three topologies aims to reach locations that are not covered by wireless LAN network, in addition this method can save the use of network resources such as LAN cables. Based on the simulation results, it is found that the topology point to point gives better value but it generated higher delays. The delay generated on point to point is higher than other topologies. Meanwhile, the measurement results are not much different on topology point to multipoint with repeater topology. The point to multipoint topology is slightly better than the repeater of the three QoS parameters.

scholarly journals Penerapan Wireless Distribution System (WDS) Mesh Untuk Optimasi Coverage Area Wifi Universitas Muhammadiyah Jember

2019 ◽  
Author(s):  
Achmad Riyadus Sholikhin ◽  
Triawan Adi Cahyanto
Keyword(s):  
Distribution System ◽  
Wireless Lan ◽  
Signal Strength ◽  
Access Point ◽  
Signal To Noise ◽  
Coverage Area

Salah satu perubahan yang sangat pesat di dalam jaringan komputer adalah penggunaan wireless LAN (WLAN) untuk mengakses jaringan baik lokal maupun internet. Salah satu cara penambahan Access Point (AP) yang tidak mengubah konfigurasi software yang telah di gunakan yaitu menggunakan jaringan Wireless Distribution System Mesh (WDS). Penggunaan WDS mesh di Universitas Muhammmadiyah Jember memungkinkan konfigurasi wireless yang sedikit berbeda agar dapat mengurangi terputusnya koneksi pada pengguna karena jangkauan area jaringan wireless. Salah satu langkah adalah dengan menggunakan beberapa perangkat Acesss Point menjadi satu kesatuan untuk menangani kasus terputusnya koneksi dengan memanfaatkan service jaringan yaitu WDS Mesh. Wireless Distribution System atau (WDS) Mesh mampu meng- coverage area wifi di Universitas Muhammadiyah Jember dan hasil ujicoba serta analisa device client terhadap AP yang sudah di WDS Mesh dengan parameter Signal Strength, CCQ, Signal to Noise, Throughput adalah Excellent (Bagus)

scholarly journals LoCO: Local Cooperative Data Offloading System Based on Location Information

2019 ◽  
Vol 1 ◽  
pp. 67-75
Author(s):  
Taku Yamazaki ◽  
Kazuma Asano ◽  
Satoshi Arai ◽  
Yusuke Shimomura ◽  
Takumi Miyoshi
Keyword(s):  
Mobile Networks ◽  
Wireless Lan ◽  
High Speed ◽  
Large Data ◽  
Access Point ◽  
Network Resources ◽  
Data Offloading ◽  
Available Bandwidth ◽  
Related Information ◽  
Communication Paths

The development of high speed mobile networks and the widespread use of smartphones have enabled users to easily obtain large data volumes via the Internet. This causes a heavy consumption of network resources, a burden on the available bandwidth. To solve such problems, a data offloading method with a wireless LAN access point has been used to distribute traffic from mobile to fixed networks. However, the method using wireless LAN access points can only change the communication paths but cannot reduce the overall traffic. This paper proposes a local cooperative data offloading system (LoCO) that reduces the overall traffic by sharing data, with direct communication between neighbors based on their location-related information. Moreover, the authors implemented the LoCO system on Android smartphones and clarified its performance in comparison with a traditional client/server system through experiments to download data in a real-world environment.

scholarly journals Pengembangan Sistem Komunikasi Data Dan Jaringan Komputer Dengan Penerapan Wireless Distribution System (WDS) di SMK Negeri 1 Pringgabaya

2021 ◽  
Vol 4 (2) ◽  
pp. 345-355
Author(s):  
Muhammad Nuzuluddin ◽  
Keyword(s):  
Wireless Networks ◽  
Packet Loss ◽  
Distribution System ◽  
Internet Access ◽  
Access Point ◽  
Wireless Internet ◽  
Cable Network ◽  
Wired Networks ◽  
Major Constraint ◽  
Performance Results

At Present, many schools have used wireless networks that are used to support wired networks. Cable network is used as an amplifier of access point to make internet access for users. The problems of networking using these cables can be a major constraint to inaccessible places that can reduce the flexibility of usage. The solution for this problem is to develop and implement Wireless Distribution System (WDS) on the access point. WDS is a system to develop wireless internet network without having to use cable as backbone for access point but to take advantage of wireless network path from access point. The parameters used in the WDS system are the parameters of jitter, througput, delay and packet loss. WDS performance can be analyzed so that will be known comparison of access point performance results with cable backbone

Finding the Right Problems: Some HREM Applications to Interfaces

1984 ◽  
Vol 42 ◽  
pp. 376-379
Author(s):  
D. Cherns
Keyword(s):  
Grain Boundaries ◽  
High Resolution Electron Microscopy ◽  
Boundary Structure ◽  
Atomic Structures ◽  
Grain Boundary Structure ◽  
Resolution Electron ◽  
Point To Point ◽  
The Right ◽  
New Generation ◽  
Better Than

The use of high resolution electron microscopy (HREM) to determine the atomic structure of grain boundaries and interfaces is a topic of great current interest. Grain boundary structure has been considered for many years as central to an understanding of the mechanical and transport properties of materials. Some more recent attention has focussed on the atomic structures of metalsemiconductor interfaces which are believed to control electrical properties of contacts. The atomic structures of interfaces in semiconductor or metal multilayers is an area of growing interest for understanding the unusual electrical or mechanical properties which these new materials possess. However, although the point-to-point resolutions of currently available HREMs, ∼2-3Å, appear sufficient to solve many of these problems, few atomic models of grain boundaries and interfaces have been derived. Moreover, with a new generation of 300-400kV instruments promising resolutions in the 1.6-2.0 Å range, and resolutions better than 1.5Å expected from specialist instruments, it is an appropriate time to consider the usefulness of HREM for interface studies.

Characterization of Rh/Si multilayer structure by HREM and HAADF

1992 ◽  
Vol 50 (1) ◽  
pp. 122-123
Author(s):  
Y. Cheng ◽  
J. Liu ◽  
M.B. Stearns ◽  
D.G. Steams
Keyword(s):  
Normal Incidence ◽  
High Resolution Electron Microscopy ◽  
X Rays ◽  
Beam Direction ◽  
Cross Sectional ◽  
Optical Elements ◽  
Resolution Electron ◽  
Point To Point ◽  
Better Than

The Rh/Si multilayer (ML) thin films are promising optical elements for soft x-rays since they have a calculated normal incidence reflectivity of ∼60% at a x-ray wavelength of ∼13 nm. However, a reflectivity of only 28% has been attained to date for ML fabricated by dc magnetron sputtering. In order to determine the cause of this degraded reflectivity the microstructure of this ML was examined on cross-sectional specimens with two high-resolution electron microscopy (HREM and HAADF) techniques.Cross-sectional specimens were made from an as-prepared ML sample and from the same ML annealed at 298 °C for 1 and 100 hours. The specimens were imaged using a JEM-4000EX TEM operating at 400 kV with a point-to-point resolution of better than 0.17 nm. The specimens were viewed along Si [110] projection of the substrate, with the (001) Si surface plane parallel to the beam direction.

Atomic resolution AEM (ARAEM) of oxide superconductors

1992 ◽  
Vol 50 (1) ◽  
pp. 74-75
Author(s):  
Vinayak P. Dravid ◽  
H. Zhang ◽  
L.D. Marks ◽  
J.P. Zhang
Keyword(s):  
Electron Microscope ◽  
Field Emission ◽  
Atomic Resolution ◽  
Oxide Superconductors ◽  
Electron Holography ◽  
Analytical Electron ◽  
Analytical Electron Microscope ◽  
Point To Point ◽  
Single Instrument ◽  
Better Than

A 200 kV cold field emission gun atomic resolution analytical electron microscope (ARAEM, Hitachi HF-2000) has been recently installed at Northwestern. The ARAEM offers an unprecedented combination of atomic structure imaging of better than 0.20 nm nominal point-to-point resolution and about 0.10 nm line resolution, alongwith nanoscale analytical capabilities and electron holography in one single instrument. The ARAEM has been fully functional/operational and this paper presents some illustrative examples of application of ARAEM techniques to oxide superconductors. Additional results will be presented at the meeting.

Indicators of wireless technologies for monitoring the quality and management

2017 ◽  
Vol 11 (1) ◽  
pp. 14-24
Author(s):  
Е. М. Abbasov
Keyword(s):  
Wireless Lan ◽  
Sensor Nodes ◽  
Wireless Internet ◽  
Monitoring And Control ◽  
Ieee 802.11N ◽  
Wireless Technologies ◽  
Zigbee Technology ◽  
Transmission Of Information ◽  
And Control ◽  
Transmission Speed

The problems of integration of the various wireless technologies, for-consists in the provision of required transmission speed and the transmission of information over a considerable distance at low power sensor nodes transmitters wireless Internet-water network for remote monitoring. Analyzed the integration of wireless LAN standard IEEE 802.11n/g and Bluetooth. Determined Graphic analytical dependence-dence, the defining characteristics of the data rate for wireless IEEE 802.11n / g networks. It analyzes the main shortcomings of BSS associated with ef cient use of batteries; the basic Metody reduce energy consumption for WSN based on the ZigBee technology, based on the planning schemes of awakening and data collection schemes. The possibilities MeshLogic technology solutions for the monitoring and control tasks that are critical to BPE-autonomous work Meni sensors.

scholarly journals A balanced-to-balanced directional coupler based on branch-slotline coupled structure

Frequenz ◽  
2020 ◽  
Vol 74 (11-12) ◽  
pp. 427-433
Author(s):  
Yaxin Liu ◽  
Feng Wei ◽  
Xiaowei Shi ◽  
Cao Zeng
Keyword(s):  
Directional Coupler ◽  
Return Loss ◽  
Design Method ◽  
Differential Mode ◽  
Arbitrary Power ◽  
Measurement Results ◽  
Transition Structures ◽  
Coupled Structures ◽  
Better Than ◽  
Good Agreement

AbstractIn this paper, a balanced-to-balanced (BTB) branch-slotline directional coupler (DC) is firstly presented, which can realize an arbitrary power division ratios (PDRs). The coupler is composed by microstrip-to-slotline (MS) transition structures and branch-slotline coupled structures. The single-ended to balanced-ended conversion is simplified and easy to implemented by the MS transition structures, which intrinsically leads to the differential-mode (DM) transmission and common-mode (CM) suppression. Moreover, the different PDRs which are controlled by the widths of branch-slotlines can be achieved. In order to verify the feasibility of the proposed design method, two prototype circuits of the proposed coupler with different PDRs are fabricated and measured. The return loss and the isolation of two designs are all better than 10 dB. Moreover, the CM suppressions are greater than 35 dB. A good agreement between the simulation and measurement results is observed.

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