MATLAB Simulation Program for BER Analysis of CDMA Downlink with Rake Receiver

This MATLAB simulation program implements BER analysis for CDMA downlink systems employing Rake receiver technology. The Rake receiver is a sophisticated reception technique specifically designed for CDMA systems that effectively mitigates multipath interference and enhances signal quality through path diversity combining. In the MATLAB implementation, the simulation models CDMA downlink transmission scenarios where the Rake receiver processes multiple signal paths using finger components with delay alignment and maximum ratio combining algorithms. The program calculates Bit Error Rate (BER) metrics by comparing transmitted and received bit sequences, enabling comprehensive system performance evaluation under various channel conditions. Key implementation aspects include: - Generation of orthogonal codes for user separation - Modeling of multipath propagation channels with specified delay profiles - Implementation of Rake receiver fingers with time synchronization - Signal combining using maximal ratio combining (MRC) technique - BER calculation through statistical analysis of error patterns Through parameter adjustment and optimization of parameters such as spreading factor, number of Rake fingers, and channel conditions, the system performance can be significantly improved, enhancing CDMA signal transmission effectiveness for different operational scenarios.