Download or read book Performance Analysis of IEEE 802 11A Signals Under Different Operational Environments written by Roy Chan Hsiung Wei and published by . This book was released on 2004-09 with total page 115 pages. Available in PDF, EPUB and Kindle. Book excerpt: With the rapid employment of wireless networks commercially, the military is seeking viable solutions for providing high-speed wireless network throughout the battle space. The IEEE 802.11a wireless LAN presents an attractive solution providing up to 54 Mbps data-link bandwidth. Moreover, it operates in the less congested 5-GHz U-NII band and possesses more operating channels. This research implemented two prototype systems using low-cost commercially available hardware. The Cisco Aironet 1400 wireless bridge and the Proxim Tsunami MP.11a wireless system were chosen for their superior specifications and for their reputation of being market leaders in IEEE 802.11 wireless products. The performances of the prototype systems were evaluated in three operational environments (land, water and vegetation). The data collected were then compared to the theoretical performance.

Download or read book Performance Analysis of IEEE 802 11A Signals Under Different Operational Environments written by and published by . This book was released on 2004 with total page 115 pages. Available in PDF, EPUB and Kindle. Book excerpt: With the rapid employment of wireless networks commercially, the military is seeking viable solutions for providing high-speed wireless network throughout the battle space. The IEEE 802.11a wireless LAN presents an attractive solution providing up to 54 Mbps data-link bandwidth. Moreover, it operates in the less congested 5-GHz U-NII band and possesses more operating channels. This research implemented two prototype systems using low-cost commercially available hardware. The Cisco Aironet 1400 wireless bridge and the Proxim Tsunami MP.11a wireless system were chosen for their superior specifications and for their reputation of being market leaders in IEEE 802.11 wireless products. The performances of the prototype systems were evaluated in three operational environments (land, water and vegetation). The data collected were then compared to the theoretical performance.

Download or read book IEEE 802 11 MAC Protocol Performance Evaluation in Operational Environments written by Kacha Jitpanya and published by . This book was released on 2002-03-01 with total page 73 pages. Available in PDF, EPUB and Kindle. Book excerpt: The IEEE 802.11 MAC protocol is widely used for wireless local area networks. Consequently, it is important to examine the protocol performance in operational environments. This thesis presents a simulation study of the performance of the IEEE 802.11 MAC protocol in multihop, jamming, and mobile node environments. The effects of the request-to-send mechanism and fragmentation in these environments are also studied. The average throughput and delay are obtained from the simulation and these results are then used to analyze the protocol performance.

Download or read book Performance Analysis of Radio Over Fiber Based on IEEE 802 11a written by Siti Idani Azuriati Abdul Aziz and published by . This book was released on 2011 with total page 86 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Improvements and Performance Analysis of IEEE 80211 Medium Access Protocols written by Ozgur Ekici and published by . This book was released on 2009 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: In IEEE 802.11 standard development process, new physical and medium access layer techniques for higher throughput (IEEE 802.11n) and quality of service (IEEE 802.11e) enhancements are being designed on solid foundation of the distributed coordination function. None of these recently developed enhancements are immune to hidden node and hot-spot (congestion) problems. On the contrary, the increased operational bandwith of the higher throughput implementation makes them more prone to interference in limited number of IEEE 802.11 channels. Distributed coordination function is and will be the primary contention resolution algorithm of IEEE 802.11 systems. Identification and formulation of the common problems this channel access technique is facing in practical networks would give us a better understanding in terms of its limitations. In this work, we introduce a methodology to estimate the throughput performance of distributed coordination in unsaturated and hidden communication environments. Then by applying this methodology, we analytically estimate the abnormality in its fairness performance. The secondary channel access scheme of IEEE 802.11 is point coordination function, which does not suffer from hidden node and collision problems. We show that point coordination function in its current form has a poor throughput performance due to ignoring of the multi-rate transmission capability of users. We propose a new indexing algorithm for polling that increases the performance of point coordination function significantly. In this thesis, we extend the performance analysis of the distributed coordination function to enterprise networks configurations where networks are typically comprised of multiple access points. We propose an intelligent association algorithm that provides consistent higher throughput and better network-wide fairness independent of user load distribution within the network in comparison to the standard association algorithm.

Download or read book Prototype System for Detecting and Processing of IEEE 802 11g Signals written by Georgios Kypriotis and published by . This book was released on 2004-09-01 with total page 115 pages. Available in PDF, EPUB and Kindle. Book excerpt: On the modern battlefield, successful and fast communications is a critical issue. So the need for transmitting information in larger amounts through a military high-speed network increases. Thus the military is seeking viable and effective solutions that may fulfill these requirements in an operational environment. This thesis develops a prototype system based on appropriate low-cost software and hardware solutions. This system is able to detect, analyze and process wireless 802.11g signals. The evaluation of the newly designed system proved that it is effective up to distances of about 400 m with a low packet error rate and could be a useful tool for detecting wireless 802.11g networks. After evaluating the system, it was used for capturing wireless signals so that we would determine the effective transmission range and the data throughput of an 802.11g network. We determined that such a wireless network could be used in military operations because it offers high data rates up to 200 m, while it maintains a connection of the wireless clients for distances up to 400 m. In addition, the performance data collected can be used as guidelines for estimating the expected performance in an operational situation and can provide useful information for successful planning.

Download or read book Interference Mitigation Techniques to Support Coexistence of Ultra WideBand Systems written by Abdur Rahim and published by Jörg Vogt Verlag. This book was released on 2010 with total page 190 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Pervasive Computing and Networking written by Mohammad S. Obaidat and published by John Wiley & Sons. This book was released on 2011-06-09 with total page 404 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book presents state-of-the-art research on architectures, algorithms, protocols and applications in pervasive computing and networks With the widespread availability of wireless and mobile networking technologies and the expected convergence of ubiquitous computing with these emerging technologies in the near future, pervasive computing and networking research and applications are among the hot topics on the agenda of researchers working on the next generation of mobile communications and networks. This book provides a comprehensive guide to selected topics, both ongoing and emerging, in pervasive computing and networking. It contains contributions from high profile researchers and is edited by leading experts in this field. The main topics covered in the book include pervasive computing and systems, pervasive networking security, and pervasive networking and communication. Key Features: Discusses existing and emerging communications and computing models, design architectures, mobile and pervasive wireless applications, technology and research challenges in pervasive computing systems, networking and communications Provides detailed discussions of key research challenges and open research issues in the field of autonomic computing and networking Offers information on existing experimental studies including case studies, implementation test-beds in industry and academia Includes a set of PowerPoint slides for each chapter for instructors adopting it as a textbook Pervasive Computing and Networking will be an ideal reference for practitioners and researchers working in the areas of communication networking and pervasive computing and networking. It also serves as an excellent textbook for graduate and senior undergraduate courses in computer science, computer engineering, electrical engineering, software engineering, and information engineering and science.

Download or read book Performance Evaluation of Transceiver in IEEE 802 11a Wireless LAN Standard written by Pavan Inturi and published by . This book was released on 2003 with total page 180 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Throughput and Performance Analysis of IEEE 802 11E written by Xintong Li and published by . This book was released on 2003 with total page 116 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Network Performance Engineering written by Demetres D. Kouvatsos and published by Springer Science & Business Media. This book was released on 2011-05-09 with total page 1073 pages. Available in PDF, EPUB and Kindle. Book excerpt: During recent years a great deal of progress has been made in performance modelling and evaluation of the Internet, towards the convergence of multi-service networks of diverging technologies, supported by internetworking and the evolution of diverse access and switching technologies. The 44 chapters presented in this handbook are revised invited works drawn from PhD courses held at recent HETNETs International Working Conferences on Performance Modelling and Evaluation of Heterogeneous Networks. They constitute essential introductory material preparing the reader for further research and development in the field of performance modelling, analysis and engineering of heterogeneous networks and of next and future generation Internets. The handbook aims to unify relevant material already known but dispersed in the literature, introduce the readers to unfamiliar and unexposed research areas and, generally, illustrate the diversity of research found in the high growth field of convergent heterogeneous networks and the Internet. The chapters have been broadly classified into 12 parts covering the following topics: Measurement Techniques; Traffic Modelling and Engineering; Queueing Systems and Networks; Analytic Methodologies; Simulation Techniques; Performance Evaluation Studies; Mobile, Wireless and Ad Hoc Networks, Optical Networks; QoS Metrics and Algorithms; All IP Convergence and Networking; Network Management and Services; and Overlay Networks.

Download or read book Performance Analysis of IEEE 802 11g TCM Waveforms Transmitted Over a Channel with Pulse noise Interference written by and published by . This book was released on 2007 with total page 139 pages. Available in PDF, EPUB and Kindle. Book excerpt: Trellis-coded modulation (TCM) is a technique that introduces forward error correction (FEC) coding without increasing the bandwidth of the channel signal. TCM combines binary convolution codes with M-ary signal constellation. The application of TCM combines FEC coding and M-ary modulation in one operation. The objective of this thesis is to investigate the performance of an orthogonal frequency-division multiplexing (OFDM) based IEEE 802.11g wireless local area network (WLAN) standard receiver when the waveform is transmitted over an additive white Gaussian noise (AWGN) environment combined with pulse-noise-interference (PNI), for the trellis-coded modulation (TCM) waveform specified by the WLAN standard. In addition to a TCM waveform consisting of a rate r=2/3, 4-state, 8-state and 16-state (K=1, K=2, K=3 and K=4 memory elements) convolution code with 8-phase-shift keying (8-PSK) modulation (analogous to the IEEE 802.11g TCM mode), improvements to the TCM system will be considered. Specifically, two rate r=1/2 convolution codes independently encoding data on the I and Q channels will be modulated with two 4-pulse amplitude modulation (4-PAM) waveforms. Both K=1 and K=2, K=2 and K=3, and K=2 and K=4 convolution codes (constant number of states and constant constraint length, respectively) will be considered.

Download or read book Communications Infrastructure Systems and Applications written by Rashid Mehmood and published by Springer Science & Business Media. This book was released on 2009-12-18 with total page 324 pages. Available in PDF, EPUB and Kindle. Book excerpt: The First International ICST Conference on Communications Infrastructure, Systems and Applications in Europe (EuropeComm 2009) was held August 11–13, 2009, in London. EuropeComm 2009 brought together decision makers from the EU comm- sion, top researchers and industry executives to discuss the directions of communi- tions research and development in Europe. The event also attracted academia and industry representatives, as well as government officials to discuss the current dev- opments and future trends in technology, applications and services in the communi- tions field. Organizing this conference was motivated by the fact that the development and - ployment of future services will require a common global-scale infrastructure, and therefore it is important that designers and stakeholders from all the systems stacks come together to discuss these developments. Rapidly decreasing costs of compu- tional power, storage capacity, and communication bandwidth have led to the dev- opment of a multitude of applications carrying an increasingly huge amount of traffic on the global networking infrastructure. What we have seen is an evolution: an inf- structure looking for networked applications has evolved into an infrastructure str- gling to meet the social, technological and business challenges posed by the plethora of bandwidth-hungry emerging applications.

Download or read book Performance Analysis for Increasing Throughput in QoS based IEEE 802 11e Wireless Networks written by and published by . This book was released on 2005 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Performance Evaluation of IEEE 802 11b in a Typical Singapore Home Environment written by Lucas Foo Yang Chong and published by . This book was released on 2004 with total page 72 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Wireless Technologies Concepts Methodologies Tools and Applications written by Management Association, Information Resources and published by IGI Global. This book was released on 2011-08-31 with total page 2875 pages. Available in PDF, EPUB and Kindle. Book excerpt: Contains the latest research, case studies, theories, and methodologies within the field of wireless technologies.

Download or read book Quantitative Analysis of Cognitive Radio and Network Performance written by Preston Marshall and published by Artech House. This book was released on 2010 with total page 479 pages. Available in PDF, EPUB and Kindle. Book excerpt: Cognitive radio – a paradigm for wireless communication in which either a network or a wireless node changes its transmission or reception parameters to communicate more efficiently and avoid interference -- is one of the most exciting emerging fields in communications technology. Taking an integrated development approach, this cutting-edge book provides you with clear methods for performing quantitative analysis of cognitive radio techniques in a variety of environments. This detailed reference presents a quantitative structure that helps you determine the capability of cognitive radio to address a number of constraints of current radio design. Critical to understanding the operation of cognitive radio, the book develops an analytic model for a range of spectrum environments. Moreover, this unique resource offers you unique insight into the application of dynamic spectrum access (DSA) to improve the performance of all classes of wireless devices. DVD Included! Contains sample cognitive radio environments and closed form approximations of these environments in MATLAB file format. This data enables you to reproduce the analysis provided in the book, perform the exercises in each chapter, and extend the work through independent investigation and research.