MSK Modulation and Demodulation Program

This document presents three commonly used MSK modulation techniques - the direct method, phase derivation method, and indirect method - along with a user-friendly MSK demodulation program. These modulation schemes find extensive applications in digital communication systems, particularly in wireless and satellite communications. The selection of modulation approach depends on specific system characteristics and application requirements, making it essential to understand each method's advantages, limitations, and suitable implementation scenarios. This documentation elaborates on the fundamental principles and practical implementation of each technique, including algorithm explanations and key function descriptions for code development. We discuss their performance characteristics across different application environments and provide practical debugging techniques and recommendations to facilitate better comprehension and application of these methods. The implementation examples cover core aspects such as phase continuity maintenance, frequency deviation control, and symbol timing recovery mechanisms.