small Problem at the Demodulation of an SSB system

Discussion in 'Wireless & RF Design' started by goldfish300, Jul 28, 2010.

  1. goldfish300

    Thread Starter Member

    Mar 12, 2009
    hi all [​IMG]

    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 [​IMG] , i added the file of simulink im working on as attachment .

    BLOCK :
    OUTPUT :

  2. bertus


    Apr 5, 2008

    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.

  3. Wendy


    Mar 24, 2008
    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.