TRANSMITTING CAPSULE ENDOSCOPE IMAGES WITH WIRELESS LAN AND SMART ANTENNA SYSTEMS

2006 ◽  
Vol 18 (05) ◽  
pp. 246-254 ◽  
Author(s):  
SHAOU-GANG MIAOU ◽  
SHIANN-SHIUN JENG ◽  
CHEN-WAN TSUNG ◽  
CHIH-HONG HSIAO ◽  
TAH-YEONG LIN
Keyword(s):  
Capsule Endoscopy ◽  
Wireless Lan ◽  
Wireless Local Area Network ◽  
Local Area Network ◽  
Smart Antenna ◽  
Image Transmission ◽  
Wireless Channel ◽  
Area Network ◽  
Capsule Endoscope ◽  
Desktop Computer

Capsule endoscopy gradually replaces traditional endoscopy in some applications and becomes a state-of-the-art tool to detect the problems of intestines. When capsule endoscopy is used, a patient swallows a capsule-like micro-camera. An image sequence is then taken by the capsule endoscope and transmitted to a receiver carried by the patient. Eventually, these image data will be transmitted to a desktop computer and examined by a doctor. To start the diagnosis earlier and avoid limiting the patient's movement, an on-line wireless transmission for this last link is desirable. For this link, WLAN (Wireless Local Area Network) standard is a good candidate due to its high enough data rate and commercial availability. However, wireless links often result in transmission errors that are unacceptable for medical related applications, including medical image transmission. In this paper, we propose a WLAN system with smart antenna to transmit the capsule endoscope images and evaluate its performance. The simulation results demonstrate that utilizing the smart antenna can enhance the error resilient capability of the WLAN over an error prone wireless channel and provides a much reliable data link for the transmission of capsule endoscope images than the original standard.

scholarly journals The concept of Virtual Contention Window for 802.11 IBSS wireless local area network mathematic modeling

2012 ◽  
Vol 16 (6) ◽  
pp. 39-45
Author(s):  
A.V. Lazebnyi ◽  
Volodymyr Semenovych Lazebnyi
Keyword(s):  
Packet Loss ◽  
Wireless Lan ◽  
Wireless Local Area Network ◽  
Local Area Network ◽  
Local Area ◽  
Wireless Channel ◽  
Contention Window ◽  
Transmission Time ◽  
Area Network ◽  
Mathematic Modeling

The concept of a virtual contention window for assessment of temporal and probabilistic characteristics of the processes occurring in the wireless LAN 802.11 is considered. The relations for determining the transmission time delay of the data package, the uneven of transmission time, throughput of wireless channel, the probability of packet loss for networks with saturated load are proposed in this paper.

PERANCANGAN ANTENA MIKROSTRIPRECTANGULAR

Jurnal Teknik ◽  
2018 ◽  
Vol 7 (1) ◽  
Author(s):  
Heru Abrianto
Keyword(s):  
Dielectric Constant ◽  
Patch Antenna ◽  
Wireless Lan ◽  
Microstrip Antenna ◽  
Wireless Local Area Network ◽  
Local Area Network ◽  
Local Area ◽  
Area Network ◽  
Dual Polarization ◽  
Feeding Technique

Microstrip antenna which designed with dual feeding at 2.4 GHz and 5.8 GHz can meet WLAN (Wireless Local Area Network) application.Antenna fabrication use PCB FR4 double layer with thickness 1.6 mm and dielectric constant value 4.4. The length of patch antenna according to calculation 28.63 mm, but to get needed parameter length of patch should be optimized to 53 mm. After examination, this antenna has VSWR 1.212 at 2.42 GHz and 1.502 at 5.8 GHz, RL -13.94 dB at 2.42 GHz and -20.357 dB at 5.8 GHz, gain of antenna 6.16 dB at 2.42 GHz and 6.91 dB at 5.8 GHz, the radiation pattern is bidirectional. Keywords : microstrip antenna, wireless LAN, dual polarization, single feeding technique

Wireless Local Area Network Based Fire Monitoring Robot Design

2013 ◽  
Vol 278-280 ◽  
pp. 582-585
Author(s):  
Rong Gao ◽  
Qi Sheng Wu ◽  
Lan Bai
Keyword(s):  
Wireless Lan ◽  
Wireless Local Area Network ◽  
Local Area Network ◽  
Infrared Image ◽  
Local Area ◽  
Area Network ◽  
Fire Event ◽  
Fire Monitoring ◽  
Remote Terminal ◽  
Long Wave Infrared

A tms320dm642 and wireless fidelity based fire monitoring robot is designed. Flame features, both static and dynamic detecting algorithm, combine with long wave infrared (LWIR) is equipped to achieve the goal of monitoring fire. When the suspected fire event happens, Fire warning message will be sent to remote terminal through the wireless LAN automatically. Infrared image of the fire can be transmitted through the wireless network under the control of remote terminal. As LWIR camera can even look through the dense smoke of fire, fire source will be located accurately, rescuing and fire fighting work will carry on better and with less injury.

scholarly journals A Cross-Layer Key Management Scheme for MIPv6 Fast Handover over IEEE 802.11 Wireless LAN

2015 ◽  
Vol 2015 ◽  
pp. 1-11
Author(s):  
Chang-Seop Park ◽  
Hyun-Sun Kang ◽  
Jaijin Jung
Keyword(s):  
Ieee 802.11 ◽  
Key Management ◽  
Wireless Lan ◽  
Wireless Local Area Network ◽  
Local Area Network ◽  
Local Area ◽  
Mobile Ipv6 ◽  
Area Network ◽  
Fast Handover ◽  
Security Scheme

A new key management and security scheme is proposed to integrate Layer Two (L2) and Layer Three (L3) keys for secure and fast Mobile IPv6 handover over IEEE 802.11 Wireless Local Area Network (WLAN). Unlike the original IEEE 802.11-based Mobile IPv6 Fast Handover (FMIPv6) that requires time-consuming IEEE 802.1x-based Extensible Authentication Protocol (EAP) authentication on each L3 handover, the newly proposed key management and security scheme requires only one 802.1x-EAP regardless of how many L3 handovers occur. Therefore, the proposed scheme reduces the handover latency that results from a lengthy 802.1x-based EAP. The proposed key management and security scheme is extensively analyzed in terms of security and performance, and the proposed security scheme is shown to be more secure than those that were previously proposed.

Channel Assignment Algorithm in Centralized WLAN

2014 ◽  
Vol 721 ◽  
pp. 728-731
Author(s):  
Da Wei Dong ◽  
Xiao Guo Liu ◽  
Tian Jing
Keyword(s):  
Channel Assignment ◽  
Wireless Lan ◽  
Wireless Local Area Network ◽  
Local Area Network ◽  
Local Area ◽  
Area Network ◽  
Dynamic Adjustment ◽  
Access Points ◽  
Received Power ◽  
Assignment Algorithm

To reduce the number of inter-disturb access points and the interference among access points in same channel, with research on interference issus and channel assignment algorithms of wireless local area network, a scheme suitable for centralized wireless local area network was proposed aiming to minimize the total interference among access points, which comprehensively considerate the number of neighbor and the received power. And then the algorithm with cases was simulated and analyzed, the result of NS2 simulation indicated that the algorithm was simple, effective and feasible, which could realize dynamic adjustment to the wireless LAN RF channel and had a better load balance effect among non-overlapping channels.

scholarly journals Study on real-time media congestion avoidance technique for video streaming over wireless local area network

2019 ◽  
Vol 15 (3) ◽  
pp. 1535
Author(s):  
C Mohanapriya ◽  
J Govindarajan
Keyword(s):  
Congestion Control ◽  
Real Time ◽  
Video Streaming ◽  
Wireless Lan ◽  
Video Transmission ◽  
Wireless Local Area Network ◽  
Local Area Network ◽  
Congestion Avoidance ◽  
Area Network ◽  
Real Time Applications

<p>The video streaming is one of the important application which consumes more bandwidth compared to non-real-time traffic. Most of the existing video transmissions are either using UDP or RTP over UDP. Since these protocols are not designed with congestion control, they affect the performance of peer video transmissions and the non-real-time applications. Like TFRC, Real-Time Media Congestion Avoidance (RMCAT) is one of the recently proposed frameworks to provide congestion control for real-time applications. Since the need for video transmission is increasing over the wireless LAN, in this paper the performance of the protocol was studied over WLAN with different network conditions. From the detailed study, we observed that RMCAT considers the packet losses due to the distance and channel conditions as congestion loss, and hence it reduced the sending rate thereby it affected the video transmission.</p>

scholarly journals TECHNICAL PRINCIPLES FOR CREATING A WIRELESS LOCAL NETWORK WI-FI

T-Comm ◽  
2021 ◽  
Vol 15 (7) ◽  
pp. 28-33
Author(s):  
Albina Y. Sharifullina ◽  
◽  
Roman R. Galyamov ◽  
Rimma S. Zaripova ◽  
◽  
...  
Keyword(s):  
Wireless Networks ◽  
Wireless Network ◽  
Wireless Lan ◽  
Wireless Local Area Network ◽  
Local Area Network ◽  
Local Area ◽  
Local Network ◽  
Area Network ◽  
Access Points ◽  
Basic Service

This article discusses the stages of development, characteristics of a wireless local area network Wi-Fi, options for its topology and equipment used. Currently, there are such different types of wireless networks as Wireless Wide Area Network, Wireless Metropolitan Area Networks (Wireless Neighborhood Area Network), Wireless Local Area Network, Wireless Personal Area Network. Each of the listed wireless networks has its own specific range and application. Wireless LAN Wi-Fi refers to the Wireless Local Area Network. The first wireless LAN standard, Wi-Fi, was approved in 1997. From the moment of their appearance to the present day, the following standards of this network have appeared: 802.11a, 802.11b, 802.11g, 802.11n, 802.11ac, 802.11ad, 802.11ax. For each standard, the speeds and frequency ranges at which the data transmission was carried out are indicated, and the technologies on which they are built are described. Wireless LAN Wi-Fi has three topologies: 1) Ad-Hoc (point-to-point) or Independent Basic Service Set; 2) Basic Service Set (“client / server”) and 3) Extended Service Set (“extended service areas”). To build a Wi-Fi network, network adapters, access points, routers, ADSL modems, Wi-Fi phones, Wi-Fi antennas, Wi-Fi repeaters are used. Wi-Fi adapters are used by devices that do not have a built-in Wi-Fi module. Wi-Fi access points are designed for organizing wireless access within a local network. Wi-Fi routers are designed to route traffic on a computer network. ADSL modems are used to access the Internet over a telephone line. Wi-Fi repeaters are used to expand the coverage of a wireless network using already installed equipment. Wi-Fi phones are wireless IP phones. Wi-Fi antennas are used to extend the range of a wireless network.

scholarly journals Switched Beam Smart Antenna for Wireless Local Area Network

2014 ◽  
Vol 1 (1) ◽  
Author(s):  
Evizal . ◽  
Sri Listia Rosa ◽  
Eko Supriyanto ◽  
Tharek Abd Rahman ◽  
Sharul Kamal Abdul Rahim ◽  
...  
Keyword(s):  
Wireless Local Area Network ◽  
Local Area Network ◽  
Smart Antenna ◽  
Local Area ◽  
Area Network

scholarly journals PERANCANGAN JARINGAN WIRELESS LAN DENGAN MENGGUNAKAN ROUTER OS MIKROTIK PADA SEKOLAH DASAR NEGERI PAHONJEAN 01

2019 ◽  
Vol 1 (1) ◽  
pp. 103-113
Author(s):  
Janero Kennedy ◽  
Soleh Nur Rohman
Keyword(s):  
Elementary School ◽  
School Environment ◽  
Wireless Lan ◽  
Wireless Local Area Network ◽  
Local Area Network ◽  
Data Access ◽  
The Internet ◽  
Accurate Information ◽  
Area Network ◽  
Methods And Techniques

The background is a problem that occurs in al-Ittihad elementary school which causes the author to take the title of this thesis. . Around the Al-Ittihad Elementary School, the network signal from ISP providers, both GSM and CDMA, is not very good so that the data access received is not optimal. This is based on the author's own experience using GSM modems, surveys and interviews with teachers and school staff at Al-Ittihad Elementary School. Also faced with the fact that the high tariff for unlimited data access from the service provider PT. Telkom (speedy) made the author look for a solution, is there another way that is cheaper and simpler to be able to use the internet easily in the scope of this al-Ittihad elementary school comfortably, safely without having to worry about banned sites. The purpose and objective of the research is to first recognize and understand further computer network technology, especially wireless/wireless (wireless) networks. Both members make it easy for users to access the internet. Third, knowing the technique of making / building an infrastructure and implementation. Fourth, get to know information technology in the al-Ittihad elementary school environment. The research method is the method used by the author in the preparation of this thesis. The author uses methods and techniques to compile and present appropriate and accurate information. Therefore, appropriate methods and techniques are needed to obtain valid and accountable data. The method used by the author is as follows, the first research location. Second Collecting data and third Designing. Implementation is discussing how to install and configure the devices used in designing the WLAN network at the Al-Ittihad elementary school in Cilacap with Mikrotik. The output or results achieved in the design of this WLAN (Wireless Local Area Network) is to provide convenience for teachers, students and school visitors in accessing the internet, accessing the internet is not only in the school room but can also be accessed around the school environment via a wireless network. and does not require a data cable so that it is more efficient and effective.

scholarly journals Wireless LAN-Based CSI Monitoring System for Object Detection

Electronics ◽  
2018 ◽  
Vol 7 (11) ◽  
pp. 290 ◽  
Author(s):  
Tomoki Murakami ◽  
Masahiko Miyazaki ◽  
Shigemi Ishida ◽  
Akira Fukuda
Keyword(s):  
Object Detection ◽  
Monitoring System ◽  
Wireless Lan ◽  
Orthogonal Frequency Division Multiplexing ◽  
Wireless Local Area Network ◽  
Environmental Changes ◽  
Local Area Network ◽  
Detection Accuracy ◽  
Target Area ◽  
Area Network

Sensing services for the detection of humans and animals by analyzing the environmental changes of wireless local area network (WLAN) signals have attracted attention in recent years. In object detection using WLAN signals, a widely known technique is the use of time changes in received signal strength indicators that are easily measured between WLAN devices. Utilizing channel response, including power and phase values per subcarrier on multiple input multiple output (MIMO), the orthogonal frequency division multiplexing transmission was researched as channel state information (CSI) to further improve detection accuracy. This paper describes a WLAN-based CSI monitoring system that efficiently acquires the CSI of multiple links in a target area where multiple CSI measuring stations are distributed. In the system, a novel CSI monitoring station captures wireless packets sent within the area and extracts CSI by analyzing the packets on the sounding protocol, specified by IEEE 802.11ac. The paper also describes the system configuration and shows that indoor experimental measurements confirmed the system’s feasibility.

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