Download or read book Coding Schemes for Multicode CDMA Systems written by Fei Zhao and published by . This book was released on 2003 with total page 178 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Next Generation CDMA Technologies written by Hsiao-Hwa Chen and published by John Wiley & Sons. This book was released on 2007-08-20 with total page 476 pages. Available in PDF, EPUB and Kindle. Book excerpt: Future wireless communication systems should be operating mainly, if not completely, on burst data services carrying multimedia traffic.The need to support high-speed burst traffic has already posed a great challenge to all currently available air-link technologies based either on TDMA or CDMA.The first generation CDMA technology has been used in both 2G and 3G mobile cellular standards and it has been suggested that it is not suitable for high-speed burst-type traffic. There are many problems with the first generation CDMA technology, such as its low spreading efficiency, interference-limited capacity and the need for precision power control, etc... 'The Next Generation Technologies' will offer first-hand information on how to make use of various innovative technologies to implement the next generation CDMA technology. As an all-in-one reference for telecommunications engineers, advanced R & D personnels, undergraduate and postgraduate students, this book is must-read material. Addresses various important issues about the next generation CDMA technologies as the major air-link technology for beyond 3G wireless applications. Covers topics from next generation CDMA system modelling to analytical methodology, starting with the basics and progressing to advanced research topics. Contains many new and previously unpublished research results. Introduces many innovative CDMA technologies such as DS/CC-CDMA, OS/CC-CDMA, space-time complementary coding CDMA, M-ary CDMA, optical complementary coded CDMA, etc.
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 Performance Analysis of a Multi code Multi carrier CDMA Communication System written by and published by . This book was released on 2004 with total page 117 pages. Available in PDF, EPUB and Kindle. Book excerpt: A new wireless communication system denoted as Multi-Code Multi-Carrier CDMA (MC/MC-CDMA), which is the combination of Multi-Code CDMA and Multi-Carrier CDMA, is analyzed in this thesis. This system can satisfy multi-rate services using multicode schemes and multi-carrier services used for high rate transmission. In addition, the new MC/MC-CDMA system is robust against frequency selective fading, is good for narrowband interference rejection, and has higher spectral efficiency. The system is evaluated in Nakagami slow fading channel model, which can be used to model urban and suburban environments. At the receiver, the system employs three diversity schemes; namely, selection diversity, equal gain combining and maximal ratio combining. The improvements of the diversity schemes are analyzed and compared. Also the system performance is presented and compared with that of other systems such as conventional CDMA system, multi-code CDMA system, and multi-carrier CDMA system. In addition, the performance of the system in the presence of a narrow jammer signal is considered and analyzed. Results indicate that the performance of the MC/MC-CDMA system is superior to that of the conventional CDMA, multi-code CDMA and multi-carrier CDMA systems. It is also shown that the MC/MC-CDMA system is suitable for high data rate and multi-rate services.
Download or read book Frequency Domain Multiuser Detection for CDMA Systems written by Paulo Silva and published by CRC Press. This book was released on 2022-09-01 with total page 264 pages. Available in PDF, EPUB and Kindle. Book excerpt: Future broadband wireless communication systems are expected to be able to offer new and powerful services enabling fast transmission rates of several tens of Mbit/s. This is an ambitious challenge especially for mobile communication systems since these systems should be able to cope with severely time dispersive channels, associated to the signal multipath propagation. Moreover, these systems should have high spectral and power efficiencies, as well as high capacity and flexibility. Spread spectrum techniques, particularly coded division multiple access (CDMA) techniques allow high capacity and flexibility, continuous transmission requiring low-peak power requirements for the amplifiers, as well as some robustness against fading and time-dispersion effects associated with the multipath propagation. When employed in prefix assisted (PA) block transmission schemes combined with frequency-domain receiver implementations they become especially interesting for broadband wireless systems. In Frequency-Domain Multiuser Detection for CDMA Systems the use of PA block transmission is considered in the context of both DS (Direct Sequence) and MC (Multicarrier) CDMA schemes. The main goal is the study of frequency-domain multiuser detection techniques with iterative signal detection/decoding techniques, also in combination with estimation and cancelation of nonlinear distortion effects. The receiver structures are suitable to scenarios with high interference levels and strongly time-dispersive channels.
Download or read book MULTICODE CDMA FOR HIGH SPEED written by Jun Chen and published by Open Dissertation Press. This book was released on 2017-01-27 with total page 124 pages. Available in PDF, EPUB and Kindle. Book excerpt: This dissertation, "Multicode CDMA for High-speed Mobile Communications" by Jun, Chen, 陳軍, was obtained from The University of Hong Kong (Pokfulam, Hong Kong) and is being sold pursuant to Creative Commons: Attribution 3.0 Hong Kong License. The content of this dissertation has not been altered in any way. We have altered the formatting in order to facilitate the ease of printing and reading of the dissertation. All rights not granted by the above license are retained by the author. Abstract: ABSTRACT Multicode CDMA for high-speed mobile communications Submitted by CHEN Jun for the degree of Doctor of Philosophy at the University of Hong Kong in April 2002 To meet the challenge of providing high-speed multimedia services over mobile links, new technologies are proposed and studied. Multicode code-division-multiple- access (CDMA) is one of them. However, the introduction of multicode causes several problems. One is the high signal envelope variation. Another is the intra-user multicode interference (MCI) in multipath environment. To cope with these two problems, as well as to achieve better performance, several technologies including complex spreading, interference cancellation, and coherent reception have been developed. This dissertation investigates the integration of these technologies into a Wideband CDMA system. First, we examine the performance of a single code (single data channel) CDMA system with complex spreading scheme and coherent RAKE reception. In particular, the pilot channel estimation error due to multiple access and multipath interference is studied. It is shown that the estimation error severely degrades the system performance and can be effectively suppressed by low pass filters (LPFs). The pilot to data power ratio is studied and it is found that the ratio should be chosen in the range of 0.2 to 0.4 (or -7dB to -4dB) in order to achieve maximum link capacity. Besides that, a discussion on envelope variation demonstrates that complex spread signal has more stable envelope than dual-channel spread signal. iv On top of that, we present the performance analysis of a multicode CDMA system, which utilizes complex spreading, coherent detection and multistage interference cancellation. The optimal cancellation factor for each stage is derived. It is found that (k ) (k-1) the optimal cancellation factor in the k-th stage is approximated by λ to 0.85 for a wide range of signal-to-noise ratios. Finally, a baseband prototype system is developed to illustrate the feasibility of the proposed receiver architecture with multistage MCI cancellation. This dissertation addresses the wideband CDMA technology in the third-generation mobile communication system, the latest development in wireless communication industry. The contribution of this dissertation is twofold. First of all, it develops a complete theoretical analysis for complex-spread signal demodulation and multistage multicode interference cancellation. More than that, it also provides some useful results for practical system design. The optimal pilot power ratio and optimal cancellation factor are useful references for wireless engineers working with Wideband CDMA system. DOI: 10.5353/th_b3014990 Subjects: Mobile communication systems Code division multiple access
Download or read book Sequences and their Applications written by T. Helleseth and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 335 pages. Available in PDF, EPUB and Kindle. Book excerpt: Pseudorandom sequences have widespread applications, for instance, in spread spectrum, code division multiple access, optical and ultrawide band communication systems, as well as in ranging systems global positioning systems, circuit testing and stream ciphers. Such sequences also have strong ties to error-correcting codes. This volume contains survey and research papers on sequences and their applications. It brings together leading experts from discrete mathematics, computer science and communications engineering, and helps to bridge advances in these different areas. Papers in this volume discuss the theory of sequences and their applications in cryptography, coding theory, communications systems, numerical computation and computer simulation.
Download or read book OFDM and MC CDMA for Broadband Multi User Communications WLANs and Broadcasting written by Lajos Hanzo and published by John Wiley & Sons. This book was released on 2005-01-28 with total page 1014 pages. Available in PDF, EPUB and Kindle. Book excerpt: Orthogonal frequency-division multiplexing (OFDM) is a method of digital modulation in which a signal is split into several narrowband channels at different frequencies. CDMA is a form of multiplexing, which allows numerous signals to occupy a single transmission channel, optimising the use of available bandwidth. Multiplexing is sending multiple signals or streams of information on a carrier at the same time in the form of a single, complex signal and then recovering the separate signals at the receiving end. Multi-Carrier (MC) CDMA is a combined technique of Direct Sequence (DS) CDMA (Code Division Multiple Access) and OFDM techniques. It applies spreading sequences in the frequency domain. Wireless communications has witnessed a tremendous growth during the past decade and further spectacular enabling technology advances are expected in an effort to render ubiquitous wireless connectivity a reality. This technical in-depth book is unique in its detailed exposure of OFDM, MIMO-OFDM and MC-CDMA. A further attraction of the joint treatment of these topics is that it allows the reader to view their design trade-offs in a comparative context. Divided into three main parts: Part I provides a detailed exposure of OFDM designed for employment in various applications Part II is another design alternative applicable in the context of OFDM systems where the channel quality fluctuations observed are averaged out with the aid of frequency-domain spreading codes, which leads to the concept of MC-CDMA Part III discusses how to employ multiple antennas at the base station for the sake of supporting multiple users in the uplink Portrays the entire body of knowledge currently available on OFDM Provides the first complete treatment of OFDM, MIMO(Multiple Input Multiple Output)-OFDM and MC-CDMA Considers the benefits of channel coding and space time coding in the context of various application examples and features numerous complete system design examples Converts the lessons of Shannon’s information theory into design principles applicable to practical wireless systems Combines the benefits of a textbook with a research monograph where the depth of discussions progressively increase throughout the book This all-encompassing self-contained treatment will appeal to researchers, postgraduate students and academics, practising research and development engineers working for wireless communications and computer networking companies and senior undergraduate students and technical managers.
Download or read book Third Generation CDMA Systems for Enhanced Data Services written by Giridhar Mandyam and published by Academic Press. This book was released on 2002-07-10 with total page 288 pages. Available in PDF, EPUB and Kindle. Book excerpt: This authoritative new book reviews two systems and deals with the challenges engineers face in bringing these next-generation devices to market. This is the first book to cover both of the leading CDMA standards, and it provides an authoritative, current review of the newest third-generation technologies.
Download or read book Information Networking Wireless Communications Technologies and Network Applications written by Ilyoung Chong and published by Springer Science & Business Media. This book was released on 2002-09-18 with total page 824 pages. Available in PDF, EPUB and Kindle. Book excerpt: The papers comprising Vol. I and Vol. II were prepared for and presented at the International Conference on Information Networking 2002 (ICOIN 2002), which was held from January 30 to February 1, 2002 at Cheju Island, Korea. It was organized by the KISS (Korean Information Science Society) SIGIN in Korea, IPSJ SIG DPE (Distributed Processing Systems) in Japan, the ITRI (Industrial Technology Research Institute), and National Taiwan University in Taiwan. The papers were selected through two steps, refereeing and presentation review. We selected for the theme of the conference the motto “One World of Information Networking”. We did this because we believe that networking will transform the world into one zone, in spite of different ages, countries and societies. Networking is in the main stream of everyday life and affects directly millions of people around the world. We are in an era of tremendous excitement for professionals working in many aspects of the converging networking, information retailing, entertainment, and publishing companies. Ubiquitous communication and computing technologies are changing the world. Online communities, e commerce, e service, and distance learning are a few of the consequences of these technologies, and advanced networking will develop new applications and technologies with global impact. The goal is the creation of a world wide distributed computing system that connects people and appliances through wireless and high bandwidth wired channels with a backbone of computers that serve as databases and object servers. Thus, Vol.
Download or read book Signal Processing for Wireless Communication Systems written by H. Vincent Poor and published by Springer Science & Business Media. This book was released on 2006-01-19 with total page 299 pages. Available in PDF, EPUB and Kindle. Book excerpt: Signal Processing for Wireless Communication Systems brings together in one place important contributions and up-to-date research results in this fast moving area. The Contributors to this work were selected from leading researchers and practitioners in this field. The book's 18 chapters are divided into three areas: systems, Networks, and Implementation Issues; Channel Estimation and Equalization; and Multiuser Detection. The Work, originally published as Volume 30, Numbers 1-3 of the Journal of VLSI Signal Processing Systems for Signal, Image, and Video Technology, will be valuable to anyone working or researching in the field of wireless communication systems. It serves as an excellent reference, providing insight into some of the most challenging issues being examined today.
Download or read book Frequency Domain Multiuser Detection for CDMA Systems written by Paulo Silva and published by CRC Press. This book was released on 2022-09-01 with total page 228 pages. Available in PDF, EPUB and Kindle. Book excerpt: Future broadband wireless communication systems are expected to be able to offer new and powerful services enabling fast transmission rates of several tens of Mbit/s. This is an ambitious challenge especially for mobile communication systems since these systems should be able to cope with severely time dispersive channels, associated to the signal multipath propagation. Moreover, these systems should have high spectral and power efficiencies, as well as high capacity and flexibility. Spread spectrum techniques, particularly coded division multiple access (CDMA) techniques allow high capacity and flexibility, continuous transmission requiring low-peak power requirements for the amplifiers, as well as some robustness against fading and time-dispersion effects associated with the multipath propagation. When employed in prefix assisted (PA) block transmission schemes combined with frequency-domain receiver implementations they become especially interesting for broadband wireless systems. In Frequency-Domain Multiuser Detection for CDMA Systems the use of PA block transmission is considered in the context of both DS (Direct Sequence) and MC (Multicarrier) CDMA schemes. The main goal is the study of frequency-domain multiuser detection techniques with iterative signal detection/decoding techniques, also in combination with estimation and cancelation of nonlinear distortion effects. The receiver structures are suitable to scenarios with high interference levels and strongly time-dispersive channels.
Download or read book Mobile Communications written by Jaiyong Lee and published by Springer Science & Business Media. This book was released on 2003-03-05 with total page 532 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book constitutes the refereed post-proceedings of the 7th CMDA International Conference, CIC 2002, held in Seoul, Korea, in October/November 2002. The 52 revised full papers presented were carefully selected during two rounds of reviewing and post-conference improvements from 140 conference presentations. The papers are organized in topical sections on modulation and coding, cellular mobile communications, IMT-2000 systems, 4G mobile systems and technology, software defined radio, wireless LAN and wireless QoS, multiple access technology, wireless multimedia services, resource management, mobility management and mobile IP, and mobile and wireless systems.
Download or read book Mobile and Wireless Communications written by Salma Ait Fares and published by BoD – Books on Demand. This book was released on 2010-01-01 with total page 418 pages. Available in PDF, EPUB and Kindle. Book excerpt: Mobile and wireless communications applications have a clear impact on improving the humanity wellbeing. From cell phones to wireless internet to home and office devices, most of the applications are converted from wired into wireless communication. Smart and advanced wireless communication environments represent the future technology and evolutionary development step in homes, hospitals, industrial, vehicular and transportation systems. A very appealing research area in these environments has been the wireless ad hoc, sensor and mesh networks. These networks rely on ultra low powered processing nodes that sense surrounding environment temperature, pressure, humidity, motion or chemical hazards, etc. Moreover, the radio frequency (RF) transceiver nodes of such networks require the design of transmitter and receiver equipped with high performance building blocks including antennas, power and low noise amplifiers, mixers and voltage controlled oscillators. Nowadays, the researchers are facing several challenges to design such building blocks while complying with ultra low power consumption, small area and high performance constraints. CMOS technology represents an excellent candidate to facilitate the integration of the whole transceiver on a single chip. However, several challenges have to be tackled while designing and using nanoscale CMOS technologies and require innovative idea from researchers and circuits designers. While major researchers and applications have been focusing on RF wireless communication, optical wireless communication based system has started to draw some attention from researchers for a terrestrial system as well as for aerial and satellite terminals. This renewed interested in optical wireless communications is driven by several advantages such as no licensing requirements policy, no RF radiation hazards, and no need to dig up roads besides its large bandwidth and low power consumption. This second part of the book, Mobile and Wireless Communications: Key Technologies and Future Applications, covers the recent development in ad hoc and sensor networks, the implementation of state of the art of wireless transceivers building blocks and recent development on optical wireless communication systems. We hope that this book will be useful for students, researchers and practitioners in their research studies.
Download or read book Optical Coding Theory with Prime written by Wing C. Kwong and published by CRC Press. This book was released on 2018-09-03 with total page 382 pages. Available in PDF, EPUB and Kindle. Book excerpt: Although several books cover the coding theory of wireless communications and the hardware technologies and coding techniques of optical CDMA, no book has been specifically dedicated to optical coding theory—until now. Written by renowned authorities in the field, Optical Coding Theory with Prime gathers together in one volume the fundamentals and developments of optical coding theory, with a focus on families of prime codes, supplemented with several families of non-prime codes. The book also explores potential applications to coding-based optical systems and networks. Learn How to Construct and Analyze Optical Codes The authors use a theorem-proof approach, breaking down theories into digestible form so that readers can understand the main message without searching through tedious proofs. The book begins with the mathematical tools needed to understand and apply optical coding theory, from Galois fields and matrices to Gaussian and combinatorial analytical tools. Using a wealth of examples, the authors show how optical codes are constructed and analyzed, and detail their performance in a variety of applications. The book examines families of 1-D and 2-D asynchronous and synchronous, multilength, and 3-D prime codes, and some non-prime codes. Get a Working Knowledge of Optical Coding Theory to Help You Design Optical Systems and Networks Prerequisites include a basic knowledge of linear algebra and coding theory, as well as a foundation in probability and communications theory. This book draws on the authors’ extensive research to offer an authoritative reference on the emerging field of optical coding theory. In addition, it supplies a working knowledge of the theory and optical codes to help readers in the design of coding-based optical systems and networks. For more on the technological aspects of optical CDMA, see Optical Code Division Multiple Access: Fundamentals and Applications (CRC Press 2005).
Download or read book Networking ICN 2005 written by Pascal Lorenz and published by Springer Science & Business Media. This book was released on 2005-04 with total page 1184 pages. Available in PDF, EPUB and Kindle. Book excerpt: The two-volume set LNCS 3420/3421 constitutes the refereed proceedings of the 4th International Conference on Networking, ICN 2005, held in Reunion Island, France in April 2005. The 238 revised full papers presented were carefully reviewed and selected from 651 submissions. The papers are organized in topical sections on grid computing, optical networks, wireless networks, QoS, WPAN, sensor networks, traffic control, communication architectures, audio and video communications, differentiated services, switching, streaming, MIMO, MPLS, ad-hoc networks, TCP, routing, signal processing, mobility, performance, peer-to-peer networks, network security, CDMA, network anomaly detection, multicast, 802.11 networks, and emergency, disaster, and resiliency.
Download or read book UWB Communication Systems written by Maria-Gabriella Di Benedetto and published by Hindawi Publishing Corporation. This book was released on 2006 with total page 513 pages. Available in PDF, EPUB and Kindle. Book excerpt: Ultrawideband (UWB) communication systems offer an unprecedented opportunityto impact the future communication world. The enormous available bandwidth, the wide scope of the data rate / rangetrade-off, as well as the potential for very low-cost operation leading topervasive usage, all present a unique opportunity for UWB systems to impactthe way people and intelligent machines communicate and interact with theirenvironment. The aim of this book is to provide an overview of the state of the art of UWBsystems from theory to applications. Due to the rapid progress of multidisciplinary UWB research, such an overviewcan only be achieved by combining the areas of expertise of severalscientists in the field. More than 30 leading UWB researchers and practitioners have contributed tothis book covering the major topics relevant to UWB. These topics includeUWB signal processing, UWB channel measurement and modeling, higher-layerprotocol issues, spatial aspects of UWB signaling, UWB regulation andstandardization, implementation issues, and UWB applications as well aspositioning. The book is targeted at advanced academic researchers, wireless designers, and graduate students wishing to greatly enhance their knowledge of allaspects of UWB systems
