The book "Fundamentals of Radio Electronics and Communications (Part II - Fundamentals of Communication Theory)" is an important work created by a team of authors that immerses the reader in the fascinating and complex world of communication theory. This edition will be an indispensable assistant for both technical students and practicing engineers seeking to deepen their knowledge in the field of radio electronics and communications. The second volume of this series continues the study of the fundamental concepts presented in the first part and deepens into the theory that underlies modern communication systems. The reader will be introduced to key aspects such as modulation, demodulation, signal transmission and signal processing. These topics are revealed through the prism of practical examples and mathematical models, which allows not only to understand the theoretical foundations, but also to see their application in real conditions. The book will be of interest not only to students and graduate students, but also to everyone who works in the field of telecommunications, radio electronics and related disciplines. It is suitable for both beginners and experienced professionals who want to refresh their knowledge or get acquainted with new approaches and technologies. If you are interested in topics such as digital communication, radio signals, antennas and their characteristics, then this publication will be a real find for you. One of the key topics that are raised in the book is the impact of new technologies on the development of communication. The authors discuss how modern advances in digital technology and signal processing are changing approaches to the design and operation of communication systems. This makes the book relevant in light of the rapid progress in the field of mobile communications, the Internet of Things and other innovative solutions that become part of our daily lives. The style of presentation of the authors is characterized by accessibility and clarity, which allows even complex concepts to be explained in simple and understandable language. Each chapter contains illustrations, graphs and examples, which contributes to a better assimilation of the material. This makes the book not only a textbook, but also an interesting reader for those who want to understand the intricacies of radio electronics and communication. The book "Fundamentals of Radio Electronics and Communications (Part II - Fundamentals of Communication Theory)" is a continuation of the tradition of high-quality publications that were created by a team of authors known for their works in the field of technical literature. Their previous works, such as Fundamentals of Radio Electronics and Theory of Radio Signals, have already won recognition among readers and professionals. This volume not only continues their legacy, but also broadens horizons by offering new ideas and approaches. If you are looking for a book that will help you understand the basics of communication theory and radio electronics, then this publication will become your reliable companion in the world of technology. It will open up new horizons of knowledge and inspire further research in this fascinating and dynamically developing field. Do not miss the opportunity to get acquainted with this book and immerse yourself in a world where science and technology are intertwined, creating the future of communication.