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[Discuss-gnuradio] Re: Complex samples format with ASK modulation
From: |
C.cc Jay |
Subject: |
[Discuss-gnuradio] Re: Complex samples format with ASK modulation |
Date: |
Tue, 25 Nov 2008 14:38:02 +0100 |
Hello Marco
I not familiar with RFID ASK10% or ASK100%.
(1)
I use usrp -> sinkfft. I can see the wave and tune the target frequency
to 13.56MHz
However, I don't understand the question "why USRP outputs I/Q samples?"
I have to reading more knowledge about communication theory.
(2) You want to plot in the time domain
When I got RFID signal, I will do demodulation and get the information
carried by the phase. I still trying.
CJay
Marco Bottino wrote:
> hello everybody,
>
> I am using the USRP with LFRX daughterboard to catch an RFID signal ASK
> modulated (frequency 13.56MHz, decimation factor 16).
> I really need an help because I don't understand very well the meaning
> of the
> outputs of my USRP: if the information related to the ASK is only the
> amplitude, so why USRP outputs I/Q samples?
> Which is the meaning of the Q samples? Which is the information carried
> by the
> phase (that should not be important in ASK modulation)?
> If I want to plot in the time domain the samples got, which kind of
> operation is
> necessary (given that I would compare my result with the
> usrp_oscope.py)?
>
> Any kind of help will be really well appreciated.
> Thank you,
>
> Marco
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