demodulation envelope am signal
Thanks for all the replies ..
The basic intention is to calculate the modulation index or percentage modulation at receiver end. When i go with normal am demodulation i.e., multiplying with carrier signal and apply LPF of carrier frequency to it so that i can get the scaled modulating signal. But the problem which i am facing is that due to dc component present in demodulated signal i am unable to calculate the correct modulation index. THis may due to improper filtering and if i filter with highest order my signal level will be of order 1e-15.
So i thought that, if i get carrier signals back at my receiver i can calculated the dc shift due to it and subtract the same from demodulated signal.
If there is any other better way to get back the original signal in more faithful way plz tell me and that is appreciated .
Thanks,
Ashwini