MATLAB-Based DS-CDMA Multi-User Communication System with QPSK Modulation
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Resource Overview
Simulation of a DS-CDMA multi-user communication system using QPSK modulation in MATLAB, featuring multipath Rayleigh fading channels, additive white Gaussian noise (AWGN) channels, root raised cosine filtering, and detailed bit error rate (BER) performance analysis.
Detailed Documentation
This project implements a MATLAB-based simulation of a QPSK-modulated DS-CDMA multi-user communication system. The system model incorporates multipath Rayleigh fading channels to simulate realistic wireless propagation effects and additive white Gaussian noise (AWGN) channels to represent background noise. For signal processing, root raised cosine filters are employed for pulse shaping and matched filtering to minimize intersymbol interference. The simulation includes comprehensive analysis and evaluation of bit error rate (BER) performance under various signal-to-noise ratio conditions. Key implementation aspects involve generating orthogonal spreading codes for multiple users, implementing QPSK modulation/demodulation, modeling channel effects using Rayleigh distribution functions, and calculating BER through Monte Carlo simulations with comparative constellation diagram visualization.
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