MATLAB M-File Implementation of DSB Modulation and Demodulation

In this document, we will discuss how to implement DSB modulation and demodulation using MATLAB. First, we need to create an M-file to implement DSB modulation. In this file, we can define parameters such as carrier frequency, signal frequency, and modulation index, then generate the modulated signal based on these parameters. We can utilize functions from MATLAB's Digital Signal Processing Toolbox for DSB modulation implementation. By multiplying the modulating signal with the carrier signal using element-wise multiplication (.* operator), we obtain the final modulated output. Key functions like cos() for carrier generation and plot() for signal visualization are essential in this process.

Next, we create another M-file for DSB demodulation implementation. This file employs filtering techniques to remove the carrier component and recover the original signal. The demodulation process typically involves multiplying the received signal with the carrier again, followed by low-pass filtering using functions like filter() or designfilt() to eliminate high-frequency components. The demodulator section should include proper filter design parameters such as cutoff frequency and filter order to ensure accurate signal recovery. This approach enables us to complete the full DSB modulation and demodulation chain with proper signal processing techniques.

This enhanced explanation provides detailed insights into the MATLAB implementation process for DSB modulation and demodulation, including critical code components and algorithmic considerations.