getting a quick start with wireless personal area networks

... Prologue: Wireless Personal Area Networks 1.1 Wireless Ad Hoc Networks Wireless ad hoc networks are a category of wireless networks that utilize multi-hop relaying of packets yet are capable of operating ... 258 Preface Wireless personal area networks and wireless sensor networks are rapidly gaining popularity, and the IEEE 802.15 Wireless Personal Area Working Group has defined no less than three ... WIRELESS PERSONAL AREA NETWORKS 1.4.2 IEEE 802.11 MAC The IEEE 802.11 protocol (O’Hara and Petrick 1999) is, strictly speaking, intended for wireless local area networks (LANs), rather than wireless...

Ngày tải lên: 25/03/2014, 12:14

... Describe a wireless personal area network (WPAN) • List the different WPAN standards and their applications • Explain how IrDA, Bluetooth, and ZigBee work • Describe the security features of low-rate ... low-rate WPAN technology What is a WPAN? • Wireless personal area network (WPAN) – Group of technologies that are designed for shortrange communications – Eliminates the need for wires or cables to ... Protocol Stack • Bluetooth RF layer – Defines how the basic hardware that controls the radio transmissions functions – Data bits (0 and 1) are converted into radio signals and transmitted • Radio module...

Ngày tải lên: 13/09/2012, 10:52

... stands heads and shoulders above other Groovy and Grails books available today Dave’s practical, hands-on approach will teach you the nuts and bolts of the language and framework and then lead ... as a GString A GString can be created by declaring a literal with double quotes; a string literal with single quotes is a java.lang.String A GString can be used in place of a Java String If Any ... that take a closure as a parameter A closure is declared by placing code between curly braces It can be declared as it is being passed to a method call, or it can be assigned to a variable and...

Ngày tải lên: 18/02/2014, 05:20

... model – have made SaaS a success The most popular and familiar example of SaaS is e-mail in a web browser, but SaaS applications are becoming increasingly sophisticated and collaborative You can run ... British Library Cataloguing-in-Publication Data A CIP record for this book is available from the British Library Library of Congress Cataloging-in-Publication Data Williams, Mark I   A quick start guide ... traffic Automated backups for IT systems and business data Set up a secondary data centre to copy backups to Use IaaS to back up data and virtual servers Run a large and complex computer simulation...

Ngày tải lên: 05/03/2014, 17:20

... their armies When in the Franco-Prussian war a German regiment was called upon for a charge, each man felt that the order was given because it was necessary, and that what he was doing was part ... They saw this army attacked at every disadvantage, rally at the call of a chief worthy of it, and who was a type of its character and its lofty motives, and then bravely endure a storm unparalleled ... broke away, and were not reorganized until after the battle A tide of fugitives set in toward the landing, carrying demoralization and terror with them Our camp was so far back that we heard nothing...

Ngày tải lên: 16/03/2014, 01:20

... overscan_bottom=10 Configuration parameters have a simple format: they start with a name followed by an equal sign and a value You can also add comments to the configuration file—they start with a ... /boot/arm128 _start. elf /boot/arm192 _start. elf /boot/arm224 _start. elf /boot /start. elf The files starting with arm contain firmware images The number after arm is the amount of main memory allocated ... Up-to-Date To make the software installation process as easy and as unobtrusive as possible, apt-get comes with a small database containing a list of all available www.it-ebooks.info report erratum...

Ngày tải lên: 24/04/2014, 16:02

... Pragmatic Programmers, LLC was aware of a trademark claim, the designations have been printed In Initial capital letters or In all capitals The Pragmatic Starter Kit, The Pragmatic Programmer, Pragmatic ... ways of initializing an array Note that the array index starts at 0, and keep in mind that uninitialized array elements contain random values A string is an array of char values The Arduino environment ... start the driver installation process On Windows Vista, driver installation usually happens automatically Lean back and watch the hardware wizard's messages pass by until it says that you can...

Ngày tải lên: 31/05/2014, 00:20

... efficient MAC A TDMA-based approach has many advantages over other similar techniques such as CSMA/CA and FDMA Authors of [12] have provided a comparison between TDMA and CSMA/CA as shown in Table ... sana1691@yahoo.com SMRI: riazulislam@ieee.org Abstract Applications of wearable and implanted wireless sensor devices are hot research area A specialized field called the body area networks (BAN) ... applications such as BAN Another argument in favor of using out-of-band wakeup radio is that a wakeup radio-based scheme in BAN can save a significant amount of power 2.2 Motivation A BAN needs...

Ngày tải lên: 21/06/2014, 17:20

... WLANs are used • List the components and modes of a WLAN WLAN Applications • Wireless networks are increasing in popularity • Installing cabling is inconvenient and very expensive – Wireless networks ... clients communicate directly among themselves without using an AP – Quick and easy setup of a wireless network • Drawback is that wireless clients can only communicate among themselves 13 Ad Hoc Mode ... interface card (NIC) – Allows a computer to be connected to a network • Wireless NIC – Connects a computer to a network without cables – Most often a separate card • Mini PCI – Small card that is...

Ngày tải lên: 13/09/2012, 10:52

... 802.16 (WiMAX) What is a WMAN? • Wireless metropolitan area networks (WMANs) – Provide wireless connectivity across a substantial geographical area such as a large city • WMANs primary goals – Extend ... installation Transmission rate Security • Disadvantages of FSO – Atmospheric conditions impact FSO transmissions – Scintillation • Temporal and spatial variations in light intensity caused by atmospheric ... and data on the same network • WiMAX MAC layer makes it easy for carriers to deploy the network • Range of a WiMAX network is measured in miles • Cellular phone operators can easily incorporate...

Ngày tải lên: 13/09/2012, 10:52

... text-only data • WAP cell phone runs a microbrowser – Uses Wireless Markup Language (WML) instead of HTML 22 Wireless Application Protocol (WAP and WAP Version 2) (continued) 23 Java • Java programming ... compatible with Java, C, and C++ • BREW efficiently uses small amount of memory – Occupies only a small amount of flash memory – Dynamically allocates RAM for applications • BREW can be used with ... Protocol (WAP) and WAP2 – Provide a standard way to transmit, format, and display Internet data • For devices such as cell phones • WAP was developed in 1997 – Enables devices to send and receive...

Ngày tải lên: 13/09/2012, 10:52

... exchanging data in an asynchronous manner Typical examples of A- nodes are mobile personal computers and Personal Digital Assistants (PDAs) Personal Area Networks (PANs) 317 † Combined asynchronous and ... C., Braley R C and Heile R F Paving the Way for Personal Area Network Standards: an Overview of the IEEE P802.15 Working Group for Wireless Personal Area Networks, IEEE Personal Communications, ... between the master and all the slaves inside a piconet An ACL link supports both single and multislot packets An ACL link is used to carry data traffic and is maintained by the master through a polling...

Ngày tải lên: 29/09/2013, 21:20

... C/10 and a FHSS one has a peak data rate that equals its subchannel’s bandwidth, while a narrowband WLAN can achieve a peak data rate of C HIPERLAN uses narrowband modulation in the GHz band It ... collocated WLANs Finally, the peak data rate of a narrowband WLAN operating in a channel of bandwidth C, is generally higher than that of a spread spectrum one A DSSS WLAN achieves peak data rates ... WLAN equipment Security is another area of concern in WLANs Radio signals may propagate beyond the geographical area of an organization All a potential intruder has to is to approach the WLAN...

Ngày tải lên: 29/09/2013, 21:20

... Shinkuma, T Takahashi, N Mandayam, TXOP Exchange: A Cooperative Resource Exchange Method in CSMA/CA, in IEICE General Conference, B-15-6 (March 2010) T Nishio, R Shinkuma, T Takahashi, N Mandayam, ... )rehtO( C ATS )redivorP( B ATS )tneilC( A ATS htdiwdnab detageleD C B C B A A htdiwdnaB htdiwdnaB Figure STA B delegates some of its bandwidth to STA A Bandwidth of STA A increases without decreasing ... legacy STAs’ behaviors The proposed method exploits RTS/ CTS mechanism to provide such characteristics In CSMA/CA with RTS/CTS, an STA sends an RTS frame to the AP before sending a data frame, and...

Ngày tải lên: 21/06/2014, 01:20

... they are needed again System Evaluation on an Activity-Aware Farkle Game 4.1 Pervasive Farkle App Description We base the system evaluation on an exemplary activity-aware application: a pervasive ... Bluetooth to the gateway, and the gateway relays the data to the 802.15.4 interface The Titan network manager additionally provides a Java API that can be used by the Pervasive App to dynamically reconfigure ... using a simple scripting language This system, however, assumes a static availability of sensors and only allows centralized data processing An approach to dynamic reconfiguration of data processing...

Ngày tải lên: 21/06/2014, 07:20

... example, based on the signal-to-noise ratio (SNR) values The automatic rate fallback (ARF) algorithm as developed in [20] regulates the packet transmission rate based on the available feedback ... adaptation algorithms, that is, the ARF and the CLA schemes, are briefly summarized as follows Both schemes will be evaluated and compared via simulations in Section 2.1 Automatic Rate Fallback (ARF) ... current transmission attempt; obtain mn,c = m∗ and lc = l∗ based on the FALA table T and SNRc ; n (the first Nm frames at the head of data queue are transmitted as an A- MPDU); if an A- MPDU is...

Ngày tải lên: 21/06/2014, 17:20

... to STA = -60 dBm BSS1 STA cAP nAP Overlapped hotspot area STA STA n Movement BSS2 STA a STA b STA Figure 1: A scenario for MAC layer handoff within overlapped hotspot area We mentioned that the ... average time associated with the transmission of a payload, an ACK frame, a PHY header, and a MAC header, respectively These can be easily obtained by dividing LPAYLOAD , LACK , LPHY , and LMAC ... an STA is not in the propagation range of other STAs as known as hidden terminal As an example, in Figure 1, the propagation range of nAP and STA a is reachable to the STA but that of STA b is...

Ngày tải lên: 21/06/2014, 23:20

... the signal build up and decay This leads to a data rate increase from Mb/s to 10 Mb/s without any penalty on power consumption The data rate can also be made adaptable by varying the duration in ... rate, at which data switches the carrier ON and OFF and hence the data rate of the transmitter The objective of this work is to target a higher data rate and ensure that the data rate is also adaptive ... In an oscillator the signal level is large unlike amplifiers and hence small signal parameters cannot be used However, small signal parameters can be used to analyze start up and can be replaced...

Ngày tải lên: 09/09/2015, 18:49