--- Quote Start ---
Hi,
I have to transmit data modulated with 250Hz carrier and bit time of 12ms (3 period of carrier). Obviously i need to demodulate that message on receiver side.
The problem is that on the transmission channel 60Hz and 180Hz signals are present. So that two frequencies could be added to the transmitted signal @ 250Hz.
Now i don't know witch kind of modulation/demodulation method is the best suitable for my purpose and if i use a classical one (ask or bpsk) is there a technique to filter out undesired frequencies?
Thanks let me know.
--- Quote End ---
your question is not right.You should know your tx signal(modulation, bandwidth, frequency centre) and then demodulation is reverse of that plus some rx front end complex work to lock to clock and/or carrier.
Honored Contributor
