Simulation of Analog Signal Modulation: DSB-SC, Bipolar RZ, AMI, and CMI Codes

Simulation of analog signal modulation techniques including DSB-SC (Double Sideband Suppressed Carrier), Bipolar Return-to-Zero (BRZ), AMI (Alternate Mark Inversion), and CMI (Coded Mark Inversion). In the modulation simulation process, appropriate modulation schemes such as DSB-SC, BRZ, AMI, and CMI can be selected based on specific requirements. Simulation code typically involves generating baseband signals, applying modulation algorithms (e.g., carrier multiplication for DSB-SC, pulse shaping for BRZ, polarity inversion logic for AMI/CMI), and analyzing spectral characteristics using FFT. Through these simulations, engineers can better understand the principles and characteristics of analog signal modulation for practical engineering applications. Modulation simulation also enables analysis of signal transmission performance, allowing evaluation and optimization of transmission quality through metrics like bit error rate (BER) calculation and eye diagram visualization.