Signal Processing: QPSK Modulation and Demodulation with MATLAB Code Implementation

This repository contains 14 MATLAB-based signal processing program source codes covering essential techniques including QPSK modulation and demodulation implementations, channel equalization methods, OFDM system simulations, wavelet transform algorithms, Kalman filtering approaches, and several other fundamental signal processing operations. These source codes serve as excellent educational resources for understanding core signal processing concepts and principles through practical implementation examples. The programs demonstrate key implementation aspects such as: - QPSK systems featuring constellation mapping, carrier modulation, and coherent detection schemes - Equalization algorithms including LMS and RLS adaptive filtering techniques - OFDM implementations with IFFT/FFT operations and cyclic prefix handling - Wavelet transform codes showcasing multi-resolution analysis and filter bank structures - Kalman filter implementations with state prediction and measurement update cycles By studying these codes, developers can gain deep insights into signal processing implementation details, algorithmic structures, and MATLAB programming patterns specific to digital communications and signal analysis. The codes provide practical reference material for developing custom signal processing applications tailored to various scenarios and requirements. These well-documented programs represent valuable assets for enhancing signal processing proficiency and technical capabilities through hands-on code examination and modification.