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List:       gnuradio-discuss
Subject:    Re: [Discuss-gnuradio] MAC layer issue
From:       George Nychis <gnychis () cmu ! edu>
Date:       2008-05-07 22:17:27
Message-ID: 48222A77.9070704 () cmu ! edu
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Hi Chin-Ya,

MAC implementations are currently a work in progress in GNU Radio, that 
is making headway with the new m-blocks and in-band signaling but not 
done yet.

You do not need a true MAC layer to transmit packets.  The PHY 
transforms bits in to some waveform, right?  There is nothing stopping a 
transmitter and receiver from making sense of these bits.

OFDM sends and receives packets the same way benchmark_tx/rx.py do.  The 
transmitter has some framing bit sequence that the receiver is going to 
look for while it decodes the bits.  If it sees the bit sequence, it 
shoves the next X bits into a structure, which is your packet.  Or, it 
decodes enough to hit a payload field and then determines how many bits 
to decode next as the payload.

Dig in to the code and following code:
./gnuradio-core/src/python/gnuradio/ofdm_packet_utils.py

- George



CHIN-YA HUANG wrote:
> Hey,
> 
> Does gnuradio implement any MAC layer thinngs, otherwise how the ofdm send and receive packets?
> 
> Thanks
> 
> 
> Chin-Ya
> 
> 
> _______________________________________________
> Discuss-gnuradio mailing list
> Discuss-gnuradio@gnu.org
> http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
> 



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