Digital Communications with Emphasis on Data Modems: Theory, Analysis, Design, Simulation, Testing, and Applications by Richard W. Middlestead delves into the practical application of theoretical concepts in digital communications, focusing on the design of software-defined radio modems. The book provides an introductory to advanced understanding of acquisition and data detection, utilizing source and executable simulation code for performance verification against theory and design specifications. Covering a range of channel characteristics from very low to optical frequencies, it offers comprehensive system analysis and subsystem implementation options tailored to various channel conditions and system specifications. Additionally, the text outlines fundamental system requirements and related analyses necessary before detailed subsystem design, making it an invaluable resource for both beginners and advanced practitioners in the field.