Hi,
we are doing some research here on decoding 802.11g using GNURadio. As
far as i know there is code available for transmission of 802.11g frames
on CGRAN but no receiver code. Is there any work going on for the
receiver side right now? Is it theoretically possible to decode a signal
received with the USRP N210? The bandwidth provided by the gigabit
ethernet connection should be sufficient in contrast to the USRP1 USB
connection, or am i wrong?
I had a look at the (generic) GNURadio OFDM mod/demod code but its kind
of hard to understand whats going on there. I have reused the
ofdm-sync-pm code to generate seemingly helpful frequency offset values
from the 802.11 short training sequence. I also extracted timing
information by correlating with the known short sequence. However i am
not sure if this synchronization is accurate enough for at least a few
fft blocks.
Is there anything like:
fine timing/frequency correction,
sampling offset correction,
channel estimation or
code for using pilot tone subcarriers
in the generic GNURadio ofdm implementation that could be reused for a
802.11g receiver? What is with the code for extracting infos from the
subcarriers? Would it be easier to rewrite it from scratch or can some
of the gnuradio code be reused?
Thanks for any information you can provide,
Thomas
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