Experimental Report on Wireless Communication System Simulation Principles and Implementation

This experimental report explains the principles of wireless communication system simulation through two main tasks. Task 1 involves performance comparison of BPSK modulation over AWGN (Additive White Gaussian Noise) and Rayleigh fading channels, implemented using MATLAB's digital modulation functions and channel objects. The simulation analyzes the relationship between bit error rate (BER) and signal-to-noise ratio (SNR) under different channel conditions, with code implementing Monte Carlo simulations for statistical BER calculation. Task 2 investigates CDMA spread spectrum multi-user systems, where MATLAB code demonstrates spreading sequence generation using Walsh codes, multi-user signal combination, and correlation-based detection. The simulation evaluates system capacity and performance through parameters like processing gain and user capacity limits, with implementation showing RAKE receiver techniques for multipath environments. The appendix provides complete MATLAB source code with detailed comments covering waveform generation, channel modeling using comm.AWGNChannel and comm.RayleighChannel objects, and performance visualization through BER vs SNR plots using semilogy functions. Through this report, readers will understand fundamental wireless simulation methodologies and practical implementation approaches for digital communication systems.