On Wed, Feb 16, 2011 at 1:50 PM, Thomas N. [email protected]
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?
Yes, the N210 will handle the bandwidth of 802.11g.
Yes, provided by the ofdm_sync block in ofdm_receiver.py.
sampling offset correction,
Yes, also provided by the ofdm_sync block in ofdm_receiver.py.
channel estimation or
Yes, in ofdm_frame_acq in ofdm_receiver.py.
code for using pilot tone subcarriers
No. That’s one of the biggest gaps in the current implementation.
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,
It should be a place to start, but it’ll probably take some work (though
hopefully less than starting from scratch). For getting the subcarriers,
probably want to look at the gr_ofdm_frame_sink block.