Generation of Various Digital Modulation Signals using MATLAB and Transmission Results under AWGN Channel

In this experiment, we will utilize MATLAB to generate various digital modulation signals and investigate their transmission performance under Additive White Gaussian Noise (AWGN) channel conditions. The implementation will cover different modulation schemes including Amplitude Modulation (AM), Quadrature Phase Shift Keying (QPSK), and Binary Phase Shift Keying (BPSK). For AM modulation, we'll implement envelope detection using MATLAB's built-in functions to demonstrate amplitude variations. QPSK implementation will involve mapping binary data to four different phase states (0°, 90°, 180°, 270°) using constellation diagrams, while BPSK will use two antipodal phases (0° and 180°). The AWGN channel will be simulated using MATLAB's awgn function with configurable signal-to-noise ratio (SNR) parameters. Key MATLAB functions to be employed include: - pskmod/pskdemod for phase shift keying modulation/demodulation - comm.AWGNChannel for noise addition - bertool for bit error rate (BER) analysis - scatterplot for constellation diagram visualization Through comparative analysis of transmission effects including BER performance and constellation diagrams, we aim to gain deeper insights into the application and performance characteristics of digital modulation techniques in practical communication systems. The experiment will include performance comparison under varying SNR conditions to evaluate each modulation scheme's noise immunity.