konrad
Joined: 27 May 2006
Posts: 1
Location: Hereford UK
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 Posted:
Sat May 27, 2006 7:01 pm Post subject:
PSK Demodulation |
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Hi, i am a newbie,
I have to demodulate a phase shift encoded signal.
There is a preamble of carrier followed by +30deg=1 -30deg=0
The data rate is 400Hz and the carrier (downconverted) is 25KHz.
question 1,
The Rf guy tells me a codec with sample at 96KHz is OK.
My thoughts, for 10deg resolution, 36*25KHz = 900KHz sample rate minimum.
Am I wrong?
question 2,
I have I & Q inputs for frquency domain conversion.
What is the best method for demodulation?
My thoughts were a PLL to lock onto the pre-amble, all in the time domain.
In the frequency domain I would have to catch the data transitions.
Am I missing soething simple?
What method is normally used?
any comment will be appreciated |
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