MATLAB Implementation of 16QAM Modulation and Demodulation

This MATLAB implementation demonstrates 16QAM (16-Quadrature Amplitude Modulation) modulation and demodulation processes. The code includes constellation diagram plotting for both transmission and reception stages to provide better understanding of signal characteristics. Key implementation features include: - Generation of 16QAM symbols using systematic constellation mapping - AWGN (Additive White Gaussian Noise) channel simulation for realistic transmission conditions - Demodulation using minimum Euclidean distance detection algorithm - Visualization of constellation points before and after transmission using MATLAB's plotting functions The implementation utilizes MATLAB's communication toolbox functions such as qammod() and qamdemod() for efficient modulation/demodulation operations, while custom code handles constellation visualization and bit error rate (BER) analysis. The constellation diagrams help visualize the effects of noise and interference on signal quality during transmission.