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Altera_Forum's avatar
Altera_Forum
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10 years ago

Best demodulation method

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...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
10 years ago

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i'm looking for the most suitable modulation/demodulation method in order to transmit a message with 250Hz carrier and receive it correctly in presence of noise @60Hz and @180Hz.

Thanks

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you can choose any of FSK,ASK,BPSK,QPSK depending on complexity you accept. You start with bits (0,1), convert them to symbols (+1,-1 etc depending on mapping then scale up for DAC). You can choose your carrier at 250H (too low and I assume it is just some practice). As to noise @ specific frequency you need to explain that since random noise is everywhere so you need to tell what is nature of that noise or is it just interferer.