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Book Performance Analysis of CDMA Systems in Multipath Channels

Download or read book Performance Analysis of CDMA Systems in Multipath Channels written by Rick Cameron and published by . This book was released on 1993 with total page 278 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Modeling and Performance Analysis of Cellular CDMA Channel with Rake Receiver

Download or read book Modeling and Performance Analysis of Cellular CDMA Channel with Rake Receiver written by Suleyman Sadi Ugural and published by . This book was released on 2001 with total page 79 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this thesis, we established a cellular CDMA reverse channel model, which incorporates a time-invariant discrete multipath Nakagami-fading channel in a multiple-cell system. The effects of intra and inter-cell interference, perfect power control, lognormal shadowing and RAKE receiver with varying number of taps are investigated. For performance improvement forward error correction and smart antenna techniques are incorporated into the model. Expressions for probability of bit error are developed under a range of operating conditions and the model is tested using Monte Carlo Simulation.

Book OFDM and MC CDMA

Download or read book OFDM and MC CDMA written by Lajos Hanzo and published by John Wiley & Sons. This book was released on 2007-01-11 with total page 430 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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. Currently, a technical in-depth book on this subject is unavailable, which has a similar 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 By providing an all-encompassing self-contained treatment this volume will appeal to a wide readership, as it is both an easy-reading textbook and a high-level research monograph.

Book Multicarrier Communications

Download or read book Multicarrier Communications written by Lie-Liang Yang and published by John Wiley & Sons. This book was released on 2009-01-21 with total page 696 pages. Available in PDF, EPUB and Kindle. Book excerpt: Benefiting from both time-domain and frequency-domain signal processing techniques, multicarrier systems have the potential for achieving high spectral-efficiency, high-flexibility and low-complexity wireless communications. Multicarrier techniques therefore constitute the promising techniques for implementation of future generations of wideband, broadband and ultra-wideband systems. Multicarrier Communications offers comprehensive and in-depth evaluation of numerous topics in the area, covering the fundamental principles of spread-spectrum and multicarrier CDMA as well as more advanced topics such as multiuser detection (MUD), multiuser transmitter preprocessing (MUTP), MIMO and space-time processing. It examines OFDM and various multicarrier CDMA within an unified framework and provides analytical approaches and formulas for error-performance evaluation of numerous multicarrier systems. Examines MUD and MUTP in parallel to illustrate the strong duality between receiver optimization and transmitter optimization Comprehensively establishes the theory of noncoherent MUD and noncoherent interference suppression Details the body of knowledge on MIMO theory and space-time multicarrier communications Contains tables, diagrams and figures to illustrate the performance results. Practicing electrical engineers and researchers in wireless communications will find Multicarrier Communications an invaluable guide. It will also be of interest to senior undergraduate and graduate students on wireless communications courses.

Book Digital Communication over Fading Channels

Download or read book Digital Communication over Fading Channels written by Marvin K. Simon and published by John Wiley & Sons. This book was released on 2005-02-11 with total page 936 pages. Available in PDF, EPUB and Kindle. Book excerpt: The four short years since Digital Communication over Fading Channels became an instant classic have seen a virtual explosion of significant new work on the subject, both by the authors and by numerous researchers around the world. Foremost among these is a great deal of progress in the area of transmit diversity and space-time coding and the associated multiple input-multiple output (MIMO) channel. This new edition gathers these and other results, previously scattered throughout numerous publications, into a single convenient and informative volume. Like its predecessor, this Second Edition discusses in detail coherent and noncoherent communication systems as well as a large variety of fading channel models typical of communication links found in the real world. Coverage includes single- and multichannel reception and, in the case of the latter, a large variety of diversity types. The moment generating function (MGF)-based approach for performance analysis, introduced by the authors in the first edition and referred to in literally hundreds of publications, still represents the backbone of the book's presentation. Important features of this new edition include: * An all-new, comprehensive chapter on transmit diversity, space-time coding, and the MIMO channel, focusing on performance evaluation * Coverage of new and improved diversity schemes * Performance analyses of previously known schemes in new and different fading scenarios * A new chapter on the outage probability of cellular mobile radio systems * A new chapter on the capacity of fading channels * And much more Digital Communication over Fading Channels, Second Edition is an indispensable resource for graduate students, researchers investigating these systems, and practicing engineers responsible for evaluating their performance.

Book Performance of Spread Sequence CDMA Systems on Multipath Fading Channel

Download or read book Performance of Spread Sequence CDMA Systems on Multipath Fading Channel written by Jin Churn Chong and published by . This book was released on 1999 with total page 144 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Performance Analysis of Decorrelating Detectors for Dual rate Synchronous DS CDMA Systems Over Frequency selective Rayleigh Fading Channels

Download or read book Performance Analysis of Decorrelating Detectors for Dual rate Synchronous DS CDMA Systems Over Frequency selective Rayleigh Fading Channels written by Xiangtao Li and published by . This book was released on 2002 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: In this thesis, the performance of a decorrelating-based multiuser detector for frequency-selective channels is discussed. The users transmit data at two different rates are instead of one single rate. According to their transmission rates, the users are classified into two groups, a group of high rate users and a group of low rate users. It is assumed that over the time interval [0, T o], the low rate users transmit one bit, while the high rate users transmit M bits of information. At the receiving end, two types of decorrelators are examined to decode the signals: a low rate decorrelator (LRD) and a high rate decorrelator (HRD). The LRD makes a decoding decision for every T o seconds and views one high rate user as M effective low rate users. The HRD makes a decision for every T 1 = T o / M seconds and detects a bit from a low rate user M times during the time interval[0, T o]. The signals from the two groups are transmitted over frequency-selective multipath Rayleigh fading channels. The maximal ratio combining (MRC) technique is used in two parts of the receivers. First, the multipath diversity and MRC diversity reception method are utilized in the receivers to combat against the multipath fading. Secondly, in HRD, MRC is employed to implement a soft decoding rule for the low rate users. The error probability and asymptotic multiuser efficiency for both types of decorrelators will be evaluated and the simulation results given. It can be seen in the simulation results that the LRD is superior to the HRD in the performance for both low rate and high rate users.

Book MULTICODE CDMA FOR HIGH SPEED

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

Book The Performance Analysis of Space Time Spreading CDMA on Transmit and Receive Antenna Diversity Systems with Imperfect Channel Estimation

Download or read book The Performance Analysis of Space Time Spreading CDMA on Transmit and Receive Antenna Diversity Systems with Imperfect Channel Estimation written by Norihito Aoki and published by . This book was released on 2002 with total page 146 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Performance Analysis of MC CDMA Systems Over Frequency selective Fading Channels

Download or read book Performance Analysis of MC CDMA Systems Over Frequency selective Fading Channels written by Zhihua Hou and published by . This book was released on 2005 with total page 164 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Performance Evaluation of Adaptive Suppression Schemes for Asynchronous CDMA Systems in Frequency selective Multipath Fading

Download or read book Performance Evaluation of Adaptive Suppression Schemes for Asynchronous CDMA Systems in Frequency selective Multipath Fading written by Mehul L. Vora and published by . This book was released on 1995 with total page 212 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Multi Carrier and Spread Spectrum Systems

Download or read book Multi Carrier and Spread Spectrum Systems written by K. Fazel and published by John Wiley & Sons. This book was released on 2004-02-06 with total page 298 pages. Available in PDF, EPUB and Kindle. Book excerpt: Frequency spectrum is a limited and valuable resource for wireless communications. A good example can be observed among network operators in Europe for the prices to pay for UMTS-frequency bands. Therefore, the first goal when designing future wireless communication systems (e.g. 4G - fourth generation) has to be the increase in spectral efficiency. The development in digital communications in the past years has enabled efficient modulation and coding techniques for robust and spectral efficient data, speech, audio and video transmission. These are the multi-carrier modulation (e.g. OFDM) and the spread spectrum technique (e.g. DS-CDMA), where OFDM was chosen for broadcast applications (DVB, DAB) as well as for broadband wireless indoor standards (ETSI HIPERLAN-II, IEEE-802.11) and the DS-CDMA was selected in mobile communications (IS-95, third generation mobile radio systems world wide, UMTS/IMT 2000). Since 1993 various combinations of multi-carrier (MC) modulation and the spread spectrum (SS) technique have been introduced and the field of MC-SS communications has become an independent and important research topic with increasing activities. New application fields have been proposed such as high rate cellular mobile, high rate wireless indoor and LMDS. It has been shown that MC-SS offers the high spectral efficiency, robustness and flexibility that is required for the next generation systems. Meanwhile, different alternative hybrid schemes such as OFDM/OFDMA, MC-TDMA, etc. have been deeply analysed and adopted in different international standards (ETSI-BRAN, IEEE-802 & MMAC). Multi-Carrier & Spread-Spectrum: Analysis of Hybrid Air Interfaces draws together all of the above mentioned hybrid schemes therefore providing a greatly needed resource for system engineers, telecommunication designers and researchers in order to enable them to develop, build and deploy several schemes based on MC-transmission for the next generation systems (which will be an integration of broadband multimedia services covering both 4G mobile and fixed wireless systems). * Offers a complete treatment of multi-carrier, spread-spectrum (SS) and time division multiplexing (TDM) techniques * Provides an in-depth insight into hybrid multiple access techniques based on multi-carrier (MC) transmission * Presents numerous hybrid multiple access and air interface architectures including OFDM/CDMA, MC-CDMA, MC-DS-CDMA and MT-CDMA * Covers new techniques such as space-time coding and software radio Telecommunications engineers, hardware & software system designers and researchers as well as students, lecturers and technicians will all find this an invaluable addition to their bookshelf.