MATLAB Simulation of Digital Baseband Transmission System

This article presents a MATLAB simulation of digital baseband transmission systems using four different line coding schemes. Digital baseband transmission refers to digital communication using baseband signals directly, without carrier modulation. Therefore, in digital baseband transmission systems, processes such as encoding, pulse shaping, and error control are essential to ensure accurate data transmission. The simulation implementation involves generating random binary data streams and applying encoding algorithms through MATLAB functions. Key functions like manchester_encode() and diff_manchester() would be developed to transform binary sequences into specific line codes. The four coding schemes implemented in this simulation are Manchester coding, Differential Manchester coding, Miller coding, and 2B1Q coding. By comparing the performance characteristics of these coding schemes through BER (Bit Error Rate) calculations and eye diagram analysis, we can better understand the working principles of digital transmission systems and select the most suitable coding scheme for specific application scenarios. The simulation includes timing recovery analysis, bandwidth efficiency comparison, and DC component evaluation for each coding method.