QPSK Modulation and Demodulation SIMULINK Simulation Diagram with MATLAB Implementation

This project presents SIMULINK simulation diagrams for QPSK modulation and demodulation based on fundamental principles. The implementation utilizes MATLAB programming to achieve QPSK modulation and demodulation processes, providing comprehensive signal analysis including waveform visualization, eye diagrams, and bit error rate measurements. The simulation diagrams encompass modulated signal waveforms, demodulated signal waveforms, eye patterns, and BER performance graphs. Key technical components include: - SIMULINK blocks for QPSK modulator/demodulator design - MATLAB code for signal generation using random bit sequences - Implementation of quadrature phase shifting with cosine and sine carriers - Eye diagram generation using MATLAB's comm.EyeDiagram system object - BER calculation through comparison of transmitted and received bit sequences - AWGN channel modeling for simulating different SNR conditions Additional analysis and interpretation of simulation results cover signal quality assessment and factors affecting bit error rate performance, such as channel noise, phase synchronization, and filtering parameters. The implementation demonstrates practical approaches for evaluating digital communication system performance using MATLAB's Communication Toolbox functions.