Plotting QPSK Signal Waveforms Using MATLAB

With a carrier frequency of 20 Hz and an information rate of 2 Baud, generate and visualize QPSK signal waveforms in MATLAB, including implementation details for modulation and waveform plotting techniques.

MATLAB Calculation and Visualization of Short-Term Energy Curve or Short-Term Average Amplitude Curve

Record your own audio signal, convert its sampling rate to 44100Hz, then use MATLAB to compute and plot either the short-term energy curve or short-term average amplitude curve (choose one). Implementation uses 20ms frame length, 10ms frame shift, and rectangular window function with signal processing algorithms.