hi all

i'm having a small problem at the output of the demodulation process of an SSB system . the input signal is a sine wave but the output is also a sine wave but with some noise . i'll put a pic of the block and the output .

N.B . Message signal freq = 30 rad/sec , Amp = 1
carrier freq. = 500 rad/sec , Amp =4 . thats all and here is the pic .
so just anyone could help me with this i would be thankful

, i added the file of simulink im working on as attachment .

BLOCK :

OUTPUT :

​

 

Hello,

I can not read the file inside the zip-file, I do not have a program for it.

The demodulated signal looks like a "beating" , the carrier frequency is a little bit off.

Bertus

 

It's not so much the .zip file, it's the .mdl file inside. Specialty software usually leaves some very experience people out in the cold, since very few people use the same software mix.

If you want to show a picture or diagram .png or .gif is the usual standards.

Looking at your waveforms, your carrier that you are reinjecting is off frequency by a little. SSB is very picky, it needs precision on the reintroduced carrier.