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List:       gnuradio-discuss
Subject:    [Discuss-gnuradio] ISO14443 rfid receiver
From:       Sebastian Herzberg <sebastian.herzberg+gnuradio () gmail ! com>
Date:       2013-03-30 16:58:38
Message-ID: CAL0c8rj0ajjRHFGxnA-oKNgZU5v9kw1iFTKndg7MYSkEHwn_kA () mail ! gmail ! com
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Hi,

I'm trying to receive a signal from a ISO14443 compliant rfid tag. I have a
USRP N210 + gnuradio running and I issue
commands (just the anticollision loop) via a ACS ACR122U reader to a faked
german ID card (fake like "offical fake by Bundesdruckerei").

As I'm a computer scientist and not that much into signal processing I
googled around and found: http://web.mit.edu/zacka/www/mbta.html
About half way down the page I saw their toolchain and tried to implement a
receiver at 12.71 MHz for one of the subcarriers.

Within the spectrum I can see that there is a signal but after demodulation
I can not see a thing in the scope plot.

Would someone be able to share a simple receiver with me so that I can
learn from that? I would really appreciate that.

Best regards

[Attachment #3 (text/html)]

<div dir="ltr"><span \
style="font-family:arial,sans-serif;font-size:13px">Hi,</span><br \
style="font-family:arial,sans-serif;font-size:13px"><br \
style="font-family:arial,sans-serif;font-size:13px"><span \
style="font-family:arial,sans-serif;font-size:13px">I&#39;m trying to receive a \
signal from a ISO14443 compliant rfid tag. I have a USRP N210 + gnuradio running and \
I issue</span><br style="font-family:arial,sans-serif;font-size:13px"> <span \
style="font-family:arial,sans-serif;font-size:13px">commands (just the anticollision \
loop) via a ACS ACR122U reader to a faked german ID card (fake like &quot;offical \
fake by Bundesdruckerei&quot;).</span><br \
style="font-family:arial,sans-serif;font-size:13px"> <br \
style="font-family:arial,sans-serif;font-size:13px"><span \
style="font-family:arial,sans-serif;font-size:13px">As I&#39;m a computer scientist \
and not that much into signal processing I googled around and found:  </span><a \
href="http://web.mit.edu/zacka/www/mbta.html" target="_blank" \
style="font-family:arial,sans-serif;font-size:13px">http://web.mit.edu/zacka/www/mbta.html</a><br \
style="font-family:arial,sans-serif;font-size:13px"> <span \
style="font-family:arial,sans-serif;font-size:13px">About half way down the page I \
saw their toolchain and tried to implement a receiver at 12.71 MHz for one of the \
subcarriers.</span><br style="font-family:arial,sans-serif;font-size:13px"> <br \
style="font-family:arial,sans-serif;font-size:13px"><span \
style="font-family:arial,sans-serif;font-size:13px">Within the spectrum I can see \
that there is a signal but after demodulation I can not see a thing in the scope \
plot.</span><br style="font-family:arial,sans-serif;font-size:13px"> <br \
style="font-family:arial,sans-serif;font-size:13px"><span \
style="font-family:arial,sans-serif;font-size:13px">Would someone be able to share a \
simple receiver with me so that I can learn from that? I would really appreciate \
that.</span><br style="font-family:arial,sans-serif;font-size:13px"> <br \
style="font-family:arial,sans-serif;font-size:13px"><span \
style="font-family:arial,sans-serif;font-size:13px">Best regards</span><br></div>



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