MATLAB Code Implementation for Continuous Phase Frequency Shift Keying (CPSFK) Simulation

In communication systems, Continuous Phase Frequency Shift Keying (CPSFK) represents an efficient modulation technique particularly suitable for spectrum-constrained scenarios. Leveraging MATLAB's powerful simulation capabilities, we can conduct in-depth analysis of CPSFK's working principles and performance metrics. This article outlines the MATLAB implementation approach for CPSFK simulation. The process begins with generating baseband signals and encoding them into transmit data using MATLAB's signal processing functions. The modulation stage converts these signals into frequency-shifted keying signals while maintaining continuous phase transitions to ensure spectral efficiency through phase continuity algorithms. The simulation framework incorporates channel noise and interference effects using MATLAB's communication toolbox functions like awgn() for additive white Gaussian noise, enabling comprehensive Bit Error Rate (BER) performance evaluation. For thorough CPSFK analysis, multiple simulation tests should be conducted under varying Signal-to-Noise Ratio (SNR) conditions using parametric loops, with results visualized through BER curve plots using MATLAB's plotting functions. Additionally, spectral analysis using MATLAB's fft() and pspectrum() functions allows observation of frequency-domain characteristics under different modulation parameters, facilitating system optimization. The CPSFK simulation not only enhances understanding of frequency shift keying modulation principles but also provides reliable references for practical communication system design through quantitative performance metrics.