MATLAB Function Simulation of Spread Spectrum Communication System

The simulation utilizes MATLAB functions to implement an extended spread spectrum communication system. We design a synchronous CDMA system supporting 6 users, where each user employs Gold codes with length L=31 for spectrum spreading. The transmission channel is modeled as an Additive White Gaussian Noise (AWGN) channel. At the receiver end, matched filter detection is implemented for signal demodulation. In the MATLAB implementation, key functions include: - Gold code generation using shift register sequences - Spreading operations through direct sequence modulation - AWGN channel simulation using randn() function with proper SNR scaling - Matched filter implementation through correlation detection - BER calculation by comparing transmitted and received bit sequences The simulation generates BER performance curves by transmitting N=10000 bits and evaluating system performance across SNR values from 0 to 15 dB. These curves provide valuable insights into the system's noise tolerance and detection capabilities, with the MATLAB code efficiently handling the large-scale Monte Carlo simulation required for accurate BER estimation.