9 research outputs found
IMPLEMENTATION OF WIRELESS LAN IN UTP
This paper, entitled Implementation ofWireless LAN in UTP environment, looks into
the way to implement wireless network in UTP. The main objectives ofthis project are
to provide mobile network and internet access using university's network system to
students and lecturers and to make it easier and convenient for student to download
lecture notes and for lecturers to upload them. Currently, there is no wireless LAN
access in UTP environment that can be use by students and staff as alternative
opportunity to access and share instant information. Therefore, this project research
area is to find out the way to implement wireless LAN using secure Wi-Fi in UTP
external environment. For this study, the scope is narrow down to the architecture and
design ofwireless LAN network and its developing methodology. Anetwork simulation
tool called Network Simulator version 2, or simply known as ns-2, is used to test the
efficiency and functionality ofthe designed network. The outcome ofthis project is a
good network architecture design that will give high network performance to all users in
UTP
IMPLEMENTATION OF WIRELESS LAN IN UTP
This paper, entitled Implementation ofWireless LAN in UTP environment, looks into
the way to implement wireless network in UTP. The main objectives ofthis project are
to provide mobile network and internet access using university's network system to
students and lecturers and to make it easier and convenient for student to download
lecture notes and for lecturers to upload them. Currently, there is no wireless LAN
access in UTP environment that can be use by students and staff as alternative
opportunity to access and share instant information. Therefore, this project research
area is to find out the way to implement wireless LAN using secure Wi-Fi in UTP
external environment. For this study, the scope is narrow down to the architecture and
design ofwireless LAN network and its developing methodology. Anetwork simulation
tool called Network Simulator version 2, or simply known as ns-2, is used to test the
efficiency and functionality ofthe designed network. The outcome ofthis project is a
good network architecture design that will give high network performance to all users in
UTP
Proceedings of the Fifth International Mobile Satellite Conference 1997
Satellite-based mobile communications systems provide voice and data communications to users over a vast geographic area. The users may communicate via mobile or hand-held terminals, which may also provide access to terrestrial communications services. While previous International Mobile Satellite Conferences have concentrated on technical advances and the increasing worldwide commercial activities, this conference focuses on the next generation of mobile satellite services. The approximately 80 papers included here cover sessions in the following areas: networking and protocols; code division multiple access technologies; demand, economics and technology issues; current and planned systems; propagation; terminal technology; modulation and coding advances; spacecraft technology; advanced systems; and applications and experiments
Resource allocation issues in broadband wireless networks with OFDM signaling
Wireless broadband technologies are anticipated to flourish in thenext few years, due to the increasing demand for wireless connectivityand the need to support enhanced services and applications in local-or wide-area environments. The primary goal in a communications systemis Quality of service (QoS) provisioning to users, which depends onprocedures that span several communication layers. Although independentconsideration of different layers simplifies system design, it oftenturns out to be insufficient for wireless networks. Cochannelinterference between users that reuse the limited spectrum and theresulting impact of local adaptation actions on overall network performance impose layer interactions in wireless systems. The purposeof this work is to identify and study some of the issues that arisefrom the synergy between the physical and the MAC layer in the contextof multiple access schemes with orthogonal channels. Using the essential feature of channel orthogonality as a baseline,our approach places emphasis on Orthogonal Frequency Division Multiplexing(OFDM), which is an emerging multiple access and signaling method for futurewireless broadband networks. In OFDM, the broadband spectrum isdivided into orthogonal, narrow-band subcarriers and user symbols aresplit into subsymbols, which are transmitted in parallel over thosevariable-quality subcarriers. OFDM transmission reduces the effectivesymbol transmission rate, simplifies equalization at the receiver andprovides high immunity to inter-symbol interference and delay spread.Furthermore, it defines a framework for flexible adaptation to varyingchannel conditions, by allowing transmission parameter control foreach subcarrier. We first address the joint problem of channel allocation withsimultaneous adaptation of modulation level and transmission power ina multi-cell OFDM network. We study the impact of those parameters oncochannel interference and channel reuse and present two classes ofcentralized heuristic algorithms to perform the allocation. Next, we focus on a single-cell multi-user system with modulationcontrol and study the problem of subcarrier assignment to userssubject to time resource constraints. We study and compare integral andfractional user assignment, whereby a user is assigned to one subcarrieror can be partially assigned to multiple subcarriers. In addition, weconsider the synergy between link-layer ARQ protocols and physicallayer parameter adaptation. We consider a simple channel monitoringmethod which is based on counting received ACKs and NACKs. For asingle subcarrier, we show that the adaptation policy which maximizeslong-term average throughput per unit time is of threshold type. Wealso expand our policy to the multiple-subcarrier case with similar ordifferent channel qualities.In the sequel, we study the impact of smart antennas and SpaceDivision Multiple Access (SDMA) on MAC layer channel allocation for a single-cell multi-user system. Our approach encompasses multipleaccess schemes with orthogonal channels, such as OFDM. We first considerthe case of unlimited transceiver resources, where a separate beam canbe formed for each user of a spatially separable cochannel user set ina subcarrier. We present heuristic algorithms to allocate subcarriersto users and adjust down-link beam patterns, transmission powers andrates with the objective to increase total achievable system rate andprovide QoS to users in the form of minimum rate guarantees. Then, we consider the allocation problem forlimited transceiver resources, which arises whenever certainreasons impose limitations on the number of beams that can beformed. We propose meaningful heuristic algorithms to jointly formbeams from corresponding transceivers and assign subcarriers andtransceivers to users, such that the total achievable system rate isincreased
THE APPLICATION OF REAL-TIME SOFTWARE IN THE IMPLEMENTATION OF LOW-COST SATELLITE RETURN LINKS
Digital Signal Processors (DSPs) have evolved to a level where it is feasible
for digital modems with relatively low data rates to be implemented entirely with
software algorithms. With current technology it is still necessary for analogue
processing between the RF input and a low frequency IF but, as DSP technology
advances, it will become possible to shift the interface between analogue and digital
domains ever closer towards the RF input. The software radio concept is a long-term
goal which aims to realise software-based digital modems which are completely
flexible in terms of operating frequency, bandwidth, modulation format and source
coding. The ideal software radio cannot be realised until DSP, Analogue to Digital
(A/D) and Digital to Analogue (D/A) technology has advanced sufficiently. Until
these advances have been made, it is often necessary to sacrifice optimum
performance in order to achieve real-time operation. This Thesis investigates practical
real-time algorithms for carrier frequency synchronisation, symbol timing
synchronisation, modulation, demodulation and FEC. Included in this work are novel
software-based transceivers for continuous-mode transmission, burst-mode
transmission, frequency modulation, phase modulation and orthogonal frequency
division multiplexing (OFDM).
Ideal applications for this work combine the requirement for flexible baseband
signal processing and a relatively low data rate. Suitable applications for this work
were identified in low-cost satellite return links, and specifically in asymmetric
satellite Internet delivery systems. These systems employ a high-speed (>>2Mbps)
DVB channel from service provider to customer and a low-cost, low-speed (32-128
kbps) return channel. This Thesis also discusses asymmetric satellite Internet delivery
systems, practical considerations for their implementation and the techniques that are
required to map TCP/IP traffic to low-cost satellite return links
Monitoreo a distancia por radiofrecuencia de grúas pórtico Sociedad Portuaria Regional de Buenaventura S.A
El sistema de monitoreo actual es basado en un software llamado (CIMPLICITY),
que por medio de una red Ethernet es el encargado de tomar los datos como
velocidad, condiciones para que se cumplan en la ejecución de las funciones de la
grúa, posición linear, posición angular, activación de sensores, activación de
interruptores, estado de redes de comunicaciones y visualización de parámetros
eléctricos (voltaje, potencia y corriente). El proyecto en si, plantea una propuesta
para el monitoreo a distancia de todas las grúas del puerto, debido a que las
primeras grúas por ser de versiones anteriores no tienen instalado ningún tipo de
elemento que permita el monitoreo a distancia a diferencia de las nuevas grúas
que si tienen en su configuración de fabrica un sistema de comunicación a
distancia por fibra óptica. la comunicación entre la grúa y la terminal de monitoreo
externa; deberá ser por un medio que no contenga cables de conexión ya que
como la grúa se encuentra en movimiento sobre el muelle, el cable se puede
romper e interrumpir la comunicación y esto conlleva a la perdida de la
información. Luego de establecer la comunicación entre la grúa y la oficina, se
realizan modificaciones en el programa de control de la grúa para lograr que
obtener los datos de los sensores del Spreader, para su visualización en la
aplicación de CIMPLICITY HMIPasantía (Ingeniero Mecatrónico)-- Universidad Autónoma de Occidente. 2008PregradoIngeniero(a) Mecatrónico(a
Morehead State University Directory 1997
The 1997 Directory of Morehead State University.https://scholarworks.moreheadstate.edu/college_histories/1187/thumbnail.jp