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Theory and Applications of OFDM and CDMA: Wideband Wireless Communications
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Theory and Applications of OFDM and CDMA is an ideal foundation textbook for those seeking a sound knowledge of this fast-developing field of wideband communications. The advanced transmission techniques of OFDM, applied in wireless LANs and in digital and video broadcasting, and CDMA, the foundation of 3G mobile communications, have been part of almost every communication system that has been designed in recent years, with both offering a high degree of flexibility in adjusting the system to the requirements of the application and to the impairments caused by the transmission channel. Starting from the basics of digital transmission theory, the reader gains a comprehensive overview of the underlying ideas of these techniques and their strengths and weaknesses under various conditions. In this context, the specific requirements of the mobile radio channel and their relevance for the design of digital transmission systems are discussed and related to the items of channel coding and modulation. Clear explanation of the basics of digital communications, mobile radio channels, coding and modulation, OFDM as a multicarrier system and CDMA as an application of spread spectrum techniques Discusses the most important mobile radio and digital broadcasting systems that use OFDM and CDMA, and explains in detail the underlying ideas for the choice of system parameters Progresses from the fundamentals of wideband communication through to modern applications Includes a Companion Website featuring a solutions manual, electronic versions of the figures and other useful resources This volume will be an invaluable resource to advanced undergraduate students and first/second year postgraduates of electrical and engineering and telecommunications. It will also appeal to practising engineers, researchers and those in academia who wish to expand their knowledge on modern aspects of digital communications and systems in a mobile radio environment.
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Title of
ebook: Theory and Applications of OFDM and CDMA: Wideband Wireless Communications
ISBN: 9780470017395
Publisher:
John Wiley & Sons, Inc.
Internet download file size: 4017 kb
Pages: 420
Released online for download: 10-31-2005
Author of eBook: Schulze, Henrik Author of eBook: Lueders, Christian
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Chapter One
Basics of Digital Communications
1.1 Orthogonal Signals and Vectors
The concept of orthogonal signals is essential for the understanding of OFDM (orthogonal
frequency division multiplexing) and CDMA (code division multiple access) systems. In
the normal sense, it may look like a miracle that one can separately demodulate overlapping
carriers (for OFDM) or detect a signal among other signals that share the same frequency
band (for CDMA). The concept of orthogonality unveils this miracle. To understand these
concepts, it is very helpful to interpret signals as vectors. Like vectors, signals can be
added, multiplied by a scalar, and they can be expanded into a base. In fact, signals fit into
the mathematical structure of a vector space. This concept may look a little bit abstract.
However, vectors ... read full excerpt from Theory and Applications of OFDM and CDMA: Wideband Wireless Communications ebook
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