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Author: Anuj Raj Ojha Publisher: ISBN: 9780549352280 Category : Frequency spectra Languages : en Pages : 99
Book Description
Continuous Phase Frequency Shift Keying (CPFSK) is a type of non-linear modulation, where the phase change from one symbol to the next symbol is continuous resulting in a faster spectral roll-off and smaller bandwidth. The multi-amplitude CPFSK (MACPFSK), which is created by superposition of CPFSK signals, is a class of CPFSK signals which also preserves the phase continuity; however it looses the constant envelope property. Application of trellis coding to MACPFSK significantly improves the system performance as it increases the minimum distance by introducing restrictions on the symbols that can be in a sequence. Thus a trellis code can be efficiently designed to achieve maximum separation in signals resulting in higher minimum distance value. Moreover, another class of Trellis Coded MACPFSK (TC-MACPFSK) signals can also be generated by altering the alignment of individual CPFSK signal, which is equivalent to the introduction of timing offset. This method inherently reduces the Peak to Average Power Ratio (PAPR) and also improves the system performance in terms of minimum distance for a particular value of timing offset.
Author: Anuj Raj Ojha Publisher: ISBN: 9780549352280 Category : Frequency spectra Languages : en Pages : 99
Book Description
Continuous Phase Frequency Shift Keying (CPFSK) is a type of non-linear modulation, where the phase change from one symbol to the next symbol is continuous resulting in a faster spectral roll-off and smaller bandwidth. The multi-amplitude CPFSK (MACPFSK), which is created by superposition of CPFSK signals, is a class of CPFSK signals which also preserves the phase continuity; however it looses the constant envelope property. Application of trellis coding to MACPFSK significantly improves the system performance as it increases the minimum distance by introducing restrictions on the symbols that can be in a sequence. Thus a trellis code can be efficiently designed to achieve maximum separation in signals resulting in higher minimum distance value. Moreover, another class of Trellis Coded MACPFSK (TC-MACPFSK) signals can also be generated by altering the alignment of individual CPFSK signal, which is equivalent to the introduction of timing offset. This method inherently reduces the Peak to Average Power Ratio (PAPR) and also improves the system performance in terms of minimum distance for a particular value of timing offset.
Author: Onur Osman Publisher: CRC Press ISBN: 1420054627 Category : Computers Languages : en Pages : 362
Book Description
Modern error control coding methods based on turbo coding have essentially solved the problem of reliable data communications over noisy channels. Contemporary Coding Techniques and Applications for Mobile Communications provides a clear, comprehensive, and practical grounding on the subject matter, examining the fundamentals, theory, and ap
Author: David J. Goodman Publisher: Springer Science & Business Media ISBN: 1461540127 Category : Technology & Engineering Languages : en Pages : 320
Book Description
Rutgers University launched WINLAB in 1989, just as the communications industry, the Federal government, and the financial community in the United States, were waking up to the growing public appetite for wireless communications and to the shortage of technology to feed it. The secret was already out in Europe, where no fewer than three new cordless and cellular systems were progressing from drawing board to laboratory to factory to consumers. In July 1989, the FCC held a well-attended tutorial that turned into a debate over whether second generation British or Swedish technology held the key to mass-market personal communications. Many in the audience wondered whether United States technology was out of the picture. Technology uncertainties are more acute in wireless communications than in any other information service. For example multi-gigabit optical fiber communications have followed an orderly progression from basic science leading to technology, which in turn stimulated standards, and then commercial products. Eventually applications will be found and industry and society at large will reap the benefits. By contrast, the applications of wireless communications are apparent to an eager public. A large market exists but is held in check by a shortage of capacity. The demand has led the cellular industry to formulate standards for advanced systems before the technology is in place to implement them. Everyone holds their breath waiting to observe performance of the first products. Gaps in basic science add to the uncertainty and forestall the resolution of technological debates.
Author: Krzysztof Wesolowski Publisher: John Wiley & Sons ISBN: 9780470695197 Category : Technology & Engineering Languages : en Pages : 578
Book Description
Combining theoretical knowledge and practical applications, this advanced-level textbook covers the most important aspects of contemporary digital communication systems. Introduction to Digital Communication Systems focuses on the rules of functioning digital communication system blocks, starting with the performance limits set by the information theory. Drawing on information relating to turbo codes and LDPC codes, the text presents the basic methods of error correction and detection, followed by baseband transmission methods, and single- and multi-carrier digital modulations. The basic properties of several physical communication channels used in digital communication systems are explained, showing the transmission and reception methods on channels suffering from intersymbol interference. The text also describes the most recent developments in the transmission techniques specific to wireless communications used both in wireline and wireless systems. The case studies are a unique feature of this book, illustrating elements of the theory developed in each chapter. Introduction to Digital Communication Systems provides a concise approach to digital communications, with practical examples and problems to supplement the text. There is also a companion website featuring an instructors’ solutions manual and presentation slides to aid understanding. Offers theoretical and practical knowledge in a self-contained textbook on digital communications Explains basic rules of recent achievements in digital communication systems such as MIMO, turbo codes, LDPC codes, OFDMA, SC-FDMA Provides problems at the end of each chapter with an instructors’ solutions manual on the companion website Includes case studies and representative communication system examples such as DVB-S, GSM, UMTS, 3GPP-LTE
Author: Richard E. Blahut Publisher: Cambridge University Press ISBN: 0521780144 Category : Computers Languages : en Pages : 515
Book Description
This detailed introduction presents the theory of digital modulation and coding underpinning the modern design of modems for telecommunications. From baseband and passband modulation and demodulation to sequence estimation, turbo codes, and the Viterbi algorithm, a wide range of key topics is covered, whilst end-of-chapter exercises test students' understanding throughout.
Author: Anuj Raj Ojha
Author: Anuj Raj Ojha
Author: Hsin-Hsyong Richard Yang
Author: Zafer Inceoglu
Author: Onur Osman
Author: Teresa Marie Thesken
Author: Chin-Feng Lin
Author: David J. Goodman
Author: 
Author: Krzysztof Wesolowski
Author: Richard E. Blahut