Extracting Instantaneous Amplitude, Phase, and Frequency of 2ASK Modulation Signals

When extracting instantaneous amplitude, phase, and frequency of 2ASK modulated signals, multiple factors must be considered. First, appropriate bandpass filters should be selected to eliminate noise and interference, which can be implemented using MATLAB's filter design functions (e.g., butter or cheby1 for IIR filters, or fir1 for FIR filters). Second, sampling and quantization processes are crucial for obtaining accurate instantaneous amplitude values, requiring careful configuration of sampling rates and analog-to-digital conversion parameters. The instantaneous phase can be derived by calculating phase differences using Hilbert transform methods (via MATLAB's hilbert function) or phase-locked loop techniques. Finally, instantaneous frequency is obtained by computing the rate of change between instantaneous phase values, typically implemented through differentiation algorithms (e.g., using diff function with proper scaling). These steps enable comprehensive characterization of 2ASK modulation signals, where key implementation aspects include proper windowing techniques for spectral analysis and amplitude demodulation using envelope detection methods.