2021-Digital-Communications-I

ASK, QAM, PSK, FSK, MSK simulations and analysis.

Lab exercises for Digital Communications I course, 6th Semester 2021 of the Electrical and Computer Engineering School at the National Technical University of Athens.

In this course I used MATLAB to simulate transmitter-channel-receiver systems using various modulation techniques, and compare their spectrum and bit error rate.

Lab 1: FFT

I created my own version of the pwelch function.

Lab 2: Filters

I created orthogonal, Hamming, Kaiser and Parks-McClellan filters and compared them.

Lab 3: ASK

ASK modulation.

Lab 4: Nyquist filters

ASK modulation using Nyquist filters. Comparison of different roll-off factors and filter order.

Lab 5: PSK and QAM

PSK and QAM modulation.

Lab 6: FSK and MSK

Coherent and non coherent FSK modulation. MSK modulation and comparison of various systems.