Feher, K. () Wireless Digital Communication Modulation & Spread Spectrum Applications. Prentice-Hall Inc., Upper Saddle River. Wireless Digital Communications by Kamilo Feher, , available at Book Depository with free delivery worldwide. Kamilo Feher is the author of Wireless Digital Communications ( avg rating, 14 ratings, 1 review, published ), Advanced Digital Communications (3.

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Complete coverage of digital cellular communications, satellite mobile radio, personal communication systems and wireless LANs.

You may be a self-motivated and ambitious engineer. Perhaps you are a student or professor. Regardless of your position or occupation, we have one goal in common: Are you reading this preface to find out why you should read this book or what you will learn from it? How is this book unique?

Should you use it as a reference text in your courses? Is it necessary to read complete sections, or is it effective to us e the book as a reference text?

Please continue to read this preface and allow me to respond to the preceding questions. My goal is to cooperate with you in the learning process. I wish to share my product and system design experience and enthusiasm in order to improve our joint understanding of wireless communications systems.

The following quotation summarizes one vision of the importance and tremendous potential of wireless computer and phone systems as: A new era of human communications where wireless technologies become information skyways, a new avenue to send ideas and masses of information to remote locations in ways most of us would never have imagined.

Wireless hand-held computers and phones will deliver the world to our fingertips wherever we may be, with speed and flexibility. William Clinton President of the United States of America Users opinions, understanding, and learning of wireless communications applications, particularly those of future communications customers, are of utmost importance to all of us.

The following quotation illustrates the opinion and understanding of a year-old: Communications in our world is very important. We could not have as many things going on around this world as we do now. Police, for example, would have a much tougher job. They could not tell each other what is going on where and no dispatcher could tell them if there is a call. Communications makes it easier to build big buildings. They need to have it because then they could tell each other to do this or that.

This world would be quite chaotic. There are two types of communications. Wired communications and wireless communications. Wireless communications includes examples such as hand held CB radio, or a hand held cellular phone. Wired communications are like house phones, or faxes. Cellular, wireless-cable, and other telecommunications and broadcasting corporations are increasi ng the voice telephony capacity of their networks and are adding new data features so that customers with wireless modulation-demodulation devices modems in portable personal computers and workstations can access electronic mail and facsimile, wr itten, graphic, audio, and video messages.

For the cellular industry, selection of the most appropriate access method is a challenging task. Both of these access methods have the capability to increase the capacity of analog cellular systems by approximately 10 to 40 times.

Already inmore than five million cellular subscribers are using se cond-generation TDMA digital technology. Spread-spectrum systems have the promise of further increasing the capacity of TDMA-based cellular and wireless systems. Both of these architectures will be extensively used during the next decade. The ultimate wireless information-communication advances will have to achieve truly unlimited capabilities and services.

New satellite communications projects, such as the multibillion dollar IRIDIUM project of Motorola, which uses 66 satellites, cou ld guarantee the “anytime, anywhere” promise; however, whether it could reach a broad consumer market at a reasonable price is questionable.

The business fields affected by the wireless computer information and communications revolution are broad and challenging. To meet this challenge, managers, engineers, students, and professors will have to become very familiar with the technologies a nd system architectures described in this book. I do not know of another book of comparable scope and depth in the wireless digital communications field.

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Most modern digital communications techniques required for the comprehension, analysis, design, and maintenance of digital wireless systems are described in this book. An introductory overview of basic material is included.

After the description of principles of operation and concepts we proceed with the study of modern techniques, architecture s, products, and standards.

Wireless Digital Communications: Modulation and Spread Spectrum Applications by Kamilo Feher

In-depth material on some of the most advanced digital modulation, spread-spectrum, and wireless radio engineering research, business developments, and worldwide applications is also included.

I assume that, to understand this book, you have a reasonable background in the foundations of basic communications engineering and technology. Selected chapters from this book have been taught at the University of California, Davis, in undergraduate and graduate courses.

Sections of this text have also been presented at numerous professional short courses around the world to practicing engineers, managers, and system operators. The enthusiastic feedback received from hundreds of participants of these courses and from readers of my previously published books motivated me to formalize my notes and write this text. I believe that university professors will find educational and intellectually challenging material for senior undergraduate communicatiobs graduate level courses.

Wireless Digital Communications : Modulation and Spread Spectrum Applications

If you are a practicing engineer and already have a generally broad knowledge of some of the topics covered in this volume, I hope that reading this text will motivate you to read the more advanced subjects. Even if you do not have the time, energy, or interest to study all of the derivations and mathematical and theoretical concepts, you could benefit from the more than figures, graphs, tables, photographs, and original measurement results.

Numerous comparisons of system specifications and standards of the s should be of considerable value to the system architect and design engineer. Thus this volume k.feher be used for your in-depth studies or as a professional reference.

It is my intent to motivate you to be inventive in this fas cinating field. In my courses I devote considerable time and effort to help students develop inventive, cost- efficient solutions. In some cases in this text I felt that I needed to become provocative in order to really challenge you and to uncover and encourage your inventive mind. Although the principal objective of this text is to provide cigital knowledge transfer and technology transfer to you, I believe that the general educational material should be complemented by research achieveme nts.

Wireless Digital Communications

Research, particularly research and development from my university and industry- based teams, is reported extensively in this book. Feher, Engineering Associates-Digcom, Inc.

Unique features of this book include its pragmatic, down-to-earth treatment of some of the most complex and advanced digital wireless communications concepts. Physical layer PHY wireless system designs, advanced baseband processing, filtering, mo dulation, radio frequency amplification, vigital radio architecture, demodulation, and synchronization subsystems are given a comprehensive treatment for the first time in a book.

Most important, critical interaction among these subsystems and communicationns joint system and hardware design, optimization, implementation, and testing of components is thoroughly discussed. In-depth mathematical and analytical treatment of radio propagation, cellular interference, digital modem, error-control, spread-spectrum, and diversity wireless systems is presented for the advanced reader; however, the busy professional could skip the derivations and use the final performance charts and wirsless.

The software adds to the uniqueness and value of this book. It is a software package that you could install on your personal computer and meaningfully use with a minimal investment comnunications time.

Wireless Digital Communications : Kamilo Feher :

This package enables you to design standard modulation, communiications and nonlinear wireless systems and to create and analyze your own waveforms and modulated systems in a relatively complex linearly or nonlinearly amplified environment. Chapter 1 is an introduction to cellular, digital personal wireles systems and to the wireless mobile radio environment.

Brief sections on the evolution of mobile communications and mobile communication fundamentals are followed by descriptions of the cellular concept and first, second, third, and subsequent generations of digital cellular and wireless systems. The importance of national and international standards and standardization efforts is highlighted. Tremendous market opportunities, demands, and forecasts are presented. In Chapter 2, digitap signal processing techniques for wireless telephone and broadcast systems conmunications highlighted.


We progress from the basics of pulse code modulation PCM toward the description of advanced vocoders and linear predictive coding conce pts and devices.

The performance of reduced data rate 4. Standardized American, European, and international speech coders and decoders codecs are highlighted. In Chapter 3 you learn the most significant cellular engineering concepts and practical characteristics of radio propagation.

After a basic treatment of radio propagation, including envelope fading, Doppler spread, time delay spread, shadowing, and path loss, antenna directional and omnidirectional fundamentals and wireoess patterns are described. Frequently used empirical formulas and numerous path loss charts are presented. I provide a study of the mathematical model of multipath faded radio signals and include a simple theoretical delay spread bound. This delay spread bound is useful for a simple, effective predict ion of the maximal delay cojmunications to be anticipated in a new system design, without the requirements for extensive and time- consuming field measurements.

Conventional and original instrumentation and measurement setups, including the design and constru ction of low-cost delay spread field measurement apparatus, are described for the first time in a book.

Extensive field measurement results of personal communications systems PCScellular, and land-based mobile radio applications are presented in numerous charts. Industry standards for propagation models are also described.

These standards highlight the differences for various bit- rate mobile applications.

Chapter 4 places a strong emphasis on the treatment of modem and combined modulation and radio engineering design techniques for wireless applications. This chapter presents original, in-depth coverage of modulation topics. Comprehensive study of pro pagation- interference and synchronization of modem and combined modem-radio equipment is provided, as these have a critical importance in the overall wireless radio and PHY architecture and performance.

The wide range of modulation choices is beneficial, since it allows us to select and design the best new and emerging systems. The challenge we face is that we have to take a fair amount of time to study these choices in order to standardize these systems and to design compatible systems that can interact with previously standardized systems.

After the study of essential principles of baseband premodulation, techniques of spectral density, eye diagrams, and Nyquist transmission theorems, we describe modem principles and architectures. Some of the standardized modulated systems have substantially inferior performance as compared with existing alternatives.

In hindsight, it is easy for me to criticize some of the specifications of U. In this book you learn the strengths and pitfalls of the specifications of standardized systems, and you will be in a position to design better systems and standards and to create improved-performance systems that are compatible with previously standar dized systems.

Complex cellular interference environment, including in-band carrier and adjacent channel interference and their relation to the newest, most powerful modulated system performance, is described for the first time in a book. Fundamental and practical definitions of spectral and power efficiency, as well as specifications, are presented. A thorough study of advantages of coherent demodulation over noncoherent systems is also included in this chapter.

In Chapter 5, error correction and detection methods and techniques are highlighted. By adding redundancy to the information customer or source bits, errors induced by a noisy or interference-limited wireless system can be detected and corrected.

B lock coding concepts and definitions, repetition codes, Hamming distance and codes, BCH, and Golay, Reed-Solomon, and convolutional coding methods are briefly described. In addition to bit-error-rate performance, also known as probability of error P eword-error-rate, false-alarm-rate, and throughput of wireless systems are studied.

Performance studies of repetition codes and of majority voting systems, as well as automatic repeat request or query ARQare reviewed. In Chapter 6 you learn spread-spectrum system fundamentals and applications.