2FSK Modulation and Demodulation: Principles with Code Implementation

In this article, I will provide a comprehensive explanation of the principles behind 2FSK modulation and demodulation in digital communication systems, accompanied by detailed source code. This fundamental concept involves a modulation and demodulation technique widely used in digital communications, which effectively transmits information through signal propagation. 2FSK (Binary Frequency Shift Keying) modulation and demodulation is a frequency-shift keying technique that utilizes two distinct frequencies to represent different digital signals. By implementing appropriate algorithms and code structures, we can achieve both 2FSK modulation and demodulation processes, enabling practical applications within digital communication systems. The implementation typically involves key functions such as frequency generation, symbol mapping, and phase-continuous frequency transitions. For demodulation, common approaches include frequency discrimination, phase-locked loops, or Fast Fourier Transform (FFT)-based frequency detection algorithms. Below is the detailed source code demonstrating the core implementation of 2FSK modulation and demodulation principles, featuring comments on critical algorithmic steps and parameter configurations.