Consider the voice signal m(t), provided in the form of the sampled, discrete-time signal vector m[n]. The sampling frequency used to obtain m[n] from m(t) is Fs=320kHz and the digital encoding rate is K=8 bits/sample. You can load m[n], Fs, and K with the command: load VOICE. Denote by N be the length of m[n].
Modulation at the transmitter