How to Simulate the transmission of the audio signal using AM over AWGN channel by using a MATLAB code

Question

Maitha Ahmad 2020-12-3

回答： Chaitanya Mallela 2020-12-23

How to Simulate the transmission of the audio signal using AM over AWGN channel by using a MATLAB code using specifictions

for example

Modulation index 𝑚=0.95 and Channel 𝑆/𝑁 =60 dB

Answer 1

Chaitanya Mallela 2020-12-23

Consider an audio file testSignal.wav . Use audioread function to read the audio file

[y,Fs] = audioread('testSignal.wav');

Consider a carrier signal with frequency Fc <= Fs/2

To satisfy a given modulation index (m) , the carrier amplitude can be considered as

Ac = max(y)/m;

Perform Amplitude Modulation on the audio input

y_ammod = ammod(y,Fc,Fs,0,Ac);

Pass the modulated signal over an AWGN channel with snr

rxSig = awgn(y_ammod,snr,'measured');