Preface
As communications networks become increasingly pervasive across the office, factory, and home, they play an ever more visible role through mobile connectivity, broadband Internet access, broadcast services, and emerging machine-to-machine and data-relay applications. Over the past decade, the pace of change in this domain has accelerated markedly. As a result, communications systems are no longer the sole province of specialist engineers and scientists. A much broader community now requires a sound understanding of the fundamental structure and behavior that underpin these systems.
Consequently, while this book provides technically accurate descriptions of communications systems, it is not aimed primarily at the specialist engineering reader. Rather, it seeks to offer an accessible and reliable introduction for non-specialists, without resorting to explanations that are trivial, oversimplified, or misleading. Engineers and engineering students may nevertheless find the text useful as a conceptual complement to the mathematically focused treatments typically encountered in university engineering courses.
There are many excellent books that address communications systems in depth. However, most are written for an engineering audience and assume a level of prior technical knowledge that can present a barrier to those encountering the field for the first time. This book was written to address that gap and is targeted at decision makers, managers, project managers, systems engineers, business analysts, engineers, and technically engaged users who are encountering communications systems for the first time. Its purpose is to present the fundamental principles of communications networks in a balanced and accessible manner, without sacrificing technical correctness, while deliberately avoiding excessive mathematical development or detailed descriptions of specific commercial or military implementations.
The book is not intended to serve as a design manual, nor does it attempt to provide detailed implementation guidance for specific technologies or products. Instead, the emphasis throughout is on enduring principles rather than on particular systems or transient technologies. A principles-based approach provides a more durable foundation, equipping readers to understand, interpret, and evaluate both existing communications systems and those that will emerge in the future. As a result, the text is intended to remain a useful reference for many years, requiring only limited supplementation as techniques and implementations evolve.
No prior knowledge beyond high-school mathematics is assumed. While some familiarity with basic communications concepts may help the material resonate more readily, all key ideas are introduced from first principles and developed in a manner accessible to a wide range of readers. The text supports both non-technical readers seeking conceptual understanding and technical readers who wish to gain a structured overview of communications systems without being overwhelmed by implementation detail.
The first part of the book (Chapters 1 through 12) covers the fundamentals of communications technology. Chapter 1 establishes a basic structural model for a communications system, with each of the subsequent chapters explaining the operation of one functional block. In this way, the complete operation of a communications system—from the information source to its final destination—is covered, including source coding, encryption, channel coding, modulation, multiplexing, and multiple access. The operation of radio transmitters and receivers is described in Chapter 9. Chapters 10 and 11 examine the major communications channels currently in use, with Chapter 10 focusing on cable-based transmission and Chapter 11 on radio-wave propagation. Chapter 12 concludes this part of the book with a discussion of antenna operation.
The second part of the book (Chapters 13 through 15) is concerned with the construction of communications networks, which build upon the technologies introduced in the first part. Chapter 13 describes the three basic modes of communication—simplex, half-duplex, and full-duplex—before introducing the fundamental concepts of switching. Chapters 14 and 15 then examine the operation of communications networks, with Chapter 14 focusing on local-area networks and Chapter 15 extending these concepts to wide-area networks and internetworking.
In summary, the aim of this book is to demystify communications systems by explaining each of the constituent elements and how the pieces fit together—technically, operationally, and conceptually. By focusing on the underlying principles and presenting them in a clear and coherent way, the book enables readers from diverse professional backgrounds to engage confidently with a wide range of communications systems, whether as designers, managers, users, or informed decision-makers.