Download or read book Evaluation of and Methods to Reduce Co Channel Interference on the Forward Channel of a CDMA Cellular System written by Tanya G. Mayer and published by . This book was released on 1998-12-01 with total page 98 pages. Available in PDF, EPUB and Kindle. Book excerpt: The large volumes of information necessary to support today's warfigher require the development of new technology to provide this type of secure, high data rate communication. The flexibility of cellular communications makes it an excellent choice for this purpose. Currently available cellular communications systems are narrowband; that is, they cannot support high data rate applications such as video, full Internet connection, and teleconferencing. Simply increasing the bandwidth of the existing systems will result in severe degradation due to frequency-selective fading, resulting in loss of quality and reliability. Instead, a new wideband cellular system can be used featuring a multicarrier, code division multiple access (CDMA) method. This type of system minimizes the effects of frequency-selective fading while reducing the probability of detection and interception. The limiting factor in this type of system' is co-channel interference. This thesis focuses on analyzing the co- channel interference on the forward channel of the proposed CDMA cellular system and investigating methods such as sectoring and microzoning in an effort to reduce that interference.

Download or read book Evaluation and Methods to Reduce Co Channel Interference on the Reverse Channel of a CDMA Cellular System written by Adem Durak and published by . This book was released on 1999-03-01 with total page 102 pages. Available in PDF, EPUB and Kindle. Book excerpt: With increasing exploitation of information, the demand for mobile access to high data rate multimedia services including high speed internet connection, high quality video/images, teleconferencing, and file transfer continues to grow rapidly for a wide variety of military as well as commercial applications. The current mobile communication systems are narrowband and optimized for voice. They can not support high data rate applications. Simply increasing the bandwidth of existing systems will result in severe degradation due to frequency selective fading, resulting in loss of quality and reliability. It appears that CDMA is the strongest candidate for the third generation mobile communication systems to support these demands. CDMA minimizes the effects of frequency selective fading while reducing the probability of detection and interception by non-authorized users. The primary restriction of the performance of CDMA is the co-channel interference. Since CDMA capacity is only interference limited, the interference reduction equates to better quality of service and greater user capacity. This thesis focuses on analyzing the co-channel interference on the reverse channel of the proposed CDMA cellular systems operating with perfect power control and investigating methods such as sectoring and microzoning in an effort to reduce the interference.

Download or read book Annual Review of Communications Volume 59 written by International Engineering Consortium and published by Intl. Engineering Consortiu. This book was released on 2007 with total page 740 pages. Available in PDF, EPUB and Kindle. Book excerpt: An indispensable reference publication for telecommunication and information-industry professionals. Each year, the IEC brings together into one unique resource the most current thinking and practical experience of industry leaders around the world on a variety of topics facing their areas of specialization. This 700+ page reference tool is a must for executives, managers, engineers, analysts, and educators in all sectors of today's changing information industry.

Download or read book A Comprehensive Review of Methods for the Channel Allocation Problem written by Cheeneebash, Jayrani and published by African Minds. This book was released on 2014-12-01 with total page 82 pages. Available in PDF, EPUB and Kindle. Book excerpt: The study of the channel allocation problem has received much attention during the last decade. Several techniques such as genetic algorithm, artificial neural network, simulated annealing, tabu search and others have been used. This book is devoted to compiling all the techniques that have been used to solve the channel allocation problem. Each of the methods is described fully in a manner that explains the essential parts of how the techniques are formulated and applied in solving the problem. This textbook will be helpful to students studying communications or researchers as it compiles all the techniques used since this problem was first solved.

Download or read book Advances in Computer Systems Architecture written by Thambipillai Srikanthan and published by Springer. This book was released on 2005-10-19 with total page 850 pages. Available in PDF, EPUB and Kindle. Book excerpt: On behalf of the ProgramCommittee, we are pleased to present the proceedings of the 2005 Asia-Paci?c Computer Systems Architecture Conference (ACSAC 2005) held in the beautiful and dynamic country of Singapore. This conference was the tenth in its series, one of the leading forums for sharing the emerging research ?ndings in this ?eld. In consultation with the ACSAC Steering Committee, we selected a - member Program Committee. This Program Committee represented a broad spectrum of research expertise to ensure a good balance of research areas, - stitutions and experience while maintaining the high quality of this conference series. This year’s committee was of the same size as last year but had 19 new faces. We received a total of 173 submissions which is 14% more than last year. Each paper was assigned to at least three and in some cases four ProgramC- mittee members for review. Wherever necessary, the committee members called upon the expertise of their colleagues to ensure the highest possible quality in the reviewing process. As a result, we received 415 reviews from the Program Committee members and their 105 co-reviewers whose names are acknowledged inthe proceedings.Theconferencecommitteeadopteda systematicblind review process to provide a fair assessment of all submissions. In the end, we accepted 65 papers on a broad range of topics giving an acceptance rate of 37.5%. We are grateful to all the Program Committee members and the co-reviewers for their e?orts in completing the reviews within a tight schedule.

Download or read book Proceedings of International Conference on Information Communications and Signal Processing written by and published by . This book was released on 2003 with total page 744 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Performance Analysis of Pilot Aided Forward CDMA Cellular Channel written by Nikolaos Panagopoulos and published by . This book was released on 2001-09-01 with total page 138 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this thesis we analyze the performance of the forward channel of a DS-CDMA cellular system operating in a Rayleigh-fading, Lognormal-shadowing environment. We develop an upper bound on the probability of bit error, including all the participating interference. In addition, various techniques such as sectoring and forward error correction in the terms of convolutional encoding are applied to optimize the performance. We further improve the performance by applying a narrow bandpass filter in the pilot tone branch of the demodulator. We then adjust the bandwidth of the filter in the means of the interference power passing through and observe the effects on the probability of bit error of the system. Moreover, pilot tone power control is added to enhance the demodulation. Finally, in this thesis a simple single cell system functioning as a port-to-port network communication between very small numbers of users is analyzed.

Download or read book Interference Analysis Of and Dynamic Channel Assignment Algorithms In TD CDMA written by Harald Haas and published by . This book was released on 2001 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The radio frequency spectrum for commercial wireless communications has become an expensive commodity. Consequently, radio access techniques are required which enable the efficient exploitation of these resources. This, however, is a difficult task due to an increasing diversity of wireless services. Hence, in order to achieve acceptable spectrum efficiency a flexible air- interface is required. It has been demonstrated that code division multiple access (CDMA) provides flexibility by enabling efficient multi user access in a cellular environment. In addition, time division duplex (TDD) as compared to frequency division duplex (FDD) represents an appropriate method to cater for the asymmetric use of a duplex channel. However, the TDD technique is subject to additional interference mechanisms in particular if neighbouring cells require different rates of asymmetry. If TDD is combined with an interference limited multiple access technique such as CDMA, the additional interference mechanism represents an important issue. This issue poses the question of whether a CDMA/TDD air-interface can be used in a cellular environment. The problems are eased if a hybrid TDMA (time division multiple access) / CDMA interface (TD-CDMA) is used. The reason for this is that the TDMA component adds another degree of freedom which can be utilised to avoid interference. This, however, requires special channel assignment techniques. This thesis analyses cellular CDMA/TDD systems used in indoor environments. A key parameter investigated is the interference in such systems. In the interference analysis a special focus is placed on adjacent channel interference since the jamming entity and victim entity can be in close proximity. The interference analysis shows that co-location of BS's using adjacent channels is not feasible for an adjacent channel protection factor that is less than 40 dB and frame synchronisation errors of more than 10%. Furthermore, it is demonstrated that ideal frame synchronisation does not necessarily yield the highest capacity. As a consequence, a new technique termed 'TS-opposing' is introduced. This method is intended to enable a cellular TD-CDMA/TDD system to apply cell independent channel asymmetry. For this purpose, a centralised DCA is developed. It is found that this algorithm indeed enables neighbouring cells to adopt different rates of asymmetry without a significant capacity loss. Moreover, a decentralised DCA algorithm based on the TS-opposing principle is developed. In this context, a novel TS assignment concept is proposed which reduces the complexity associated with the TS-opposing technique. In addition, the TS assignment plan allows for full spatial coverage. It is shown that the capacity of a TD-CDMA/TDD interface can be greater than the capacity of an equivalent FDD interface. The performance of the decentralised DCA algorithm is limited by the interference in the uplink. Therefore, additional methods which assist in reducing the interference in the uplink are envisaged to further improve the performance of the decentralised DCA algorithm. The exploitation of the TS-opposing technique in two different ways demonstrates that this method can be used to improve the performance of a TD-CDMA/TDD system significantly.

Download or read book Wireless Personal Communications written by William H. Tranter and published by Springer Science & Business Media. This book was released on 2000 with total page 253 pages. Available in PDF, EPUB and Kindle. Book excerpt: Wireless Personal Communications: Channel Modeling and Systems Engineering presents a broad range of topics in wireless communications, including perspectives from both industry and academia. This book serves as a reflection of emerging technologies in wireless communications and features papers from world-renowned authors on the subject. Wireless Personal Communications: Channel Modeling and Systems Engineering is divided into six sections. The first five of these cover the following topics: Propagation and Channel Modeling (4 papers); Antennas (6 papers); Multiuser Detection (3 papers); Radio Systems and Technology (4 papers); and Wireless Data (3 papers). The last section contains invited papers on areas of significant interest. Wireless Personal Communications: Channel Modeling and Systems Engineering serves as an excellent reference source and may be used as a text for advanced courses on the subject. It is an essential tool for graduate students, postgraduate researchers, academics, and anyone working in the research aspect of the wireless communications industry.

Download or read book Library Information Science Abstracts written by and published by . This book was released on 2001 with total page 874 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Code Division Multiple Access CDMA written by R. Michael Buehrer and published by Morgan & Claypool Publishers. This book was released on 2006 with total page 192 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book covers the basic aspects of Code Division Multiple Access or CDMA. It begins with an introduction to the basic ideas behind fixed and random access systems in order to demonstrate the difference between CDMA and the more widely understood TDMA, FDMA or CSMA. Secondly, a review of basic spread spectrum techniques are presented which are used in CDMA systems including direct sequence, frequency-hopping and time-hopping approaches. The basic concept of CDMA is presented, followed by the four basic principles of CDMA systems that impact their performance: interference averaging, universal frequency reuse, soft handoff, and statistical multiplexing. The focus of the discussion will then shift to applications. The most common application of CDMA currently is cellular systems. A detailed discussion on cellular voice systems based on CDMA, specifically IS-95, is presented. The capacity of such systems will be examined as well as performance enhancement techniques such as coding and spatial filtering. Also discussed are Third Generation CDMA cellular systems and how they differ from Second Generation systems. A second application of CDMA that is covered is spread spectrum packet radio networks. Finally, there is an examination of multi-user detection and interference cancellation and how such techniques impact CDMA networks. This book should be of interest and value to engineers, advanced students, and researchers in communications.

Download or read book IS 95 CDMA and Cdma2000 Cellular PCS Systems Implementation written by Garg and published by Pearson Education India. This book was released on with total page 452 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Designing cdma2000 Systems written by Leonhard Korowajczuk and published by John Wiley & Sons. This book was released on 2005-08-05 with total page 936 pages. Available in PDF, EPUB and Kindle. Book excerpt: CDMA is the second most widely deployed technology in the world with more than 100 million subscribers worldwide and is projected to reach 280 million subscribers by 2006. CDMA 2000 1x was deployed in year 2000 and CDMA 2000 1xEVDO is being deployed this year. CDMA 2000 is the natural migration for CDMA IS-95 networks and some of the TDMA networks. CDMA technology is complex to design due to its inherent adaptive characteristic and the introduction of data requires a complete new way of analysing the network from traffic characteristics to performance requirements. The authors bring a wealth of experience in developing solutions for wireless design at CelPlan Technologies, Inc. since 1992. They followed up the evolution of the wireless technology providing innovative solutions at each step. In this book they summarize the description of the CDMA 2000 technology, revisit basic design concepts and propose new solutions to design and optimise these complex networks. Many of the design issues covered in this book apply also to the novel WCDMA networks that are proposed as the evolution of GSM networks. Designing CDMA 2000 Systems: Describes in detail the structure of CDMA 2000 systems and provides guidelines for their design and optimisation Fills a major gap in the information available today serving as a comprehensive reference for designers and operators Provides coverage from introductory to specialist level Designing CDMA 2000 Systems is highly relevant for engineers involved in the design or operation of CDMA systems, as well as providing a broad understanding of the area for researchers, professors and students in the field

Download or read book Principles of Mobile Communication written by Gordon L. Stüber and published by Springer. This book was released on 2017-05-30 with total page 732 pages. Available in PDF, EPUB and Kindle. Book excerpt: This mathematically rigorous overview of physical layer wireless communications is now in a 4th, fully revised and updated edition. The new edition features new content on 4G cellular systems, 5G cellular outlook, bandpass signals and systems, and polarization, among many other topics, in addition to a new chapters on channel assignment techniques. Along with coverage of fundamentals and basic principles sufficient for novice students, the volume includes finer details that satisfy the requirements of graduate students aiming to conduct in-depth research. The book begins with a survey of the field, introducing issues relevant to wireless communications. The book moves on to cover relevant discrete subjects, from radio propagation, to error probability performance, and cellular radio resource management. An appendix provides a tutorial on probability and random processes. The content stresses core principles that are applicable to a broad range of wireless standards. New examples are provided throughout the book to better explain the more complex material to the reader. Additional problems have also been added to those already appearing at the ends of the chapters to make the book more suitable for course instruction.

Download or read book Science Abstracts written by and published by . This book was released on 1995 with total page 1874 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Independent component analysis based interference reduction in cellular systems with co channel interference written by Ivica Nikola Kostanic and published by . This book was released on 2003 with total page 163 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Theory of Code Division Multiple Access Communication written by Kamil Sh. Zigangirov and published by John Wiley & Sons. This book was released on 2004-05-10 with total page 411 pages. Available in PDF, EPUB and Kindle. Book excerpt: A comprehensive introduction to CDMA theory and application Code division multiple access (CDMA) communication is rapidly replacing time- and frequency-division methods as the cornerstone of wireless communication and mobile radio. Theory of Code Division Multiple Access Communication provides a lucid introduction and overview of CDMA concepts and methods for both the professional and the advanced student. Emphasizing the role CDMA has played in the development of wireless communication and cellular mobile radio systems, the author leads you through the basic concepts of mobile radio systems and considers the different principles of multiple access-time division, frequency division, and code division. He then analyzes three major CDMA systems-direct sequence (DS) CDMA systems, frequency hopped (FH) CDMA systems, and pulse position hopped (PPH) CDMA systems. Other topics covered include: * Spread spectrum (SS) technology * Forward error control coding * CDMA communication on fading channels * Pseudorandom signals * Information theory in relation to CDMA communication * CDMA cellular networks Complete with useful appendices providing analyses of the moments of CDMA system decision statistics, Theory of Code Division Multiple Access Communication is a ready reference for every engineer seeking an understanding of the history and concepts of this key communications technology.