MATLAB Source Code for GMSK Modulation and Demodulation

MATLAB source code program for GMSK modulation and demodulation. GMSK modulation is a widely used digital modulation technique, particularly prevalent in wireless communication systems. Below is a simplified MATLAB source code example demonstrating GMSK modulation and demodulation implementation. The implementation begins by defining key parameters including modulation index, carrier frequency, and Gaussian filter bandwidth-time product. The program then processes input digital signals through a modulation chain involving NRZ encoding, Gaussian filtering, and frequency modulation. The demodulation section employs techniques such as differential detection or coherent demodulation to recover the original digital signal. Key functions in this implementation include: - Gaussian filter design using MATLAB's gaussdesign function - Frequency modulation via fmmod function - Signal comparison using bit error rate (BER) calculation Finally, the system evaluates demodulation accuracy by comparing the original transmitted signal with the demodulated output through error analysis and BER measurement. This source code example provides practical understanding of GMSK modulation principles and implementation methodologies for digital communication systems.