Hi Ramazan - Hmmm ... I'm not coming up with anything greatly useful when using a single OFDM block for Tx. Alternatively you could use a 2 channel PFB synthesizer on Tx, with 2 separate OFDM Tx and feed them into the synthesizer. On Rx use a PFB channelizer and take its 2 outputs to 2 separate OFDM Rx. The complexity of the PFBs will depend on the filtering required to keep the OFDM channels separate enough. Maybe others have useful ideas of how to do what you're looking for? Hope this is useful! - MLD
Hi MLD,
You are right. I guess, one of the transmitters' preamble
overlaps another's data. (Because gnuradio sends preamble in all
carriers). I have attached my receiver and transmitters' FGs. Both
of them uses 256 carrier OFDM. One transmitter use half of the
carriers as occupied and another uses other half. I guess our
receiver structure is wrong.
Can you suggest a way for implementing multi user OFDM system?