Communication System Simulation Series - FSK Demodulation (Coherent Detection Method)

This MATLAB-based communication system simulation series focuses on FSK demodulation, specifically the coherent detection method. In modern communication systems, Frequency Shift Keying (FSK) is a widely used modulation and demodulation technique that enables efficient data transmission and communication. Coherent demodulation employs phase and frequency information to achieve more reliable and accurate detection results compared to non-coherent methods. Through MATLAB simulations, we will explore FSK demodulation principles, performance characteristics, and practical applications. The implementation involves generating orthogonal carriers matching the FSK frequencies, performing correlation operations using MATLAB's dot product or convolution functions, and applying threshold detection algorithms. Key functions like fskmod() for modulation and custom coherent detectors with phase-locked loops will be examined. This approach helps readers better understand FSK demodulation techniques, providing valuable insights for communication system design and optimization. Simulation code will demonstrate BER calculations, eye diagram analysis, and SNR performance evaluations using MATLAB's communication toolbox functions.