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Re: [Discuss-gnuradio] How Can I support full-duplex using SBX board whe

From: Josh Blum
Subject: Re: [Discuss-gnuradio] How Can I support full-duplex using SBX board when running tunnel.py over OFDM?
Date: Tue, 01 May 2012 09:02:18 -0700
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:11.0) Gecko/20120410 Thunderbird/11.0.1

>> Some recommendations:
>> 1) Use different frequencies for each communication channel.
> I will firstly try this option.
>> 2) Or mute the RX stream when transmitting to avoid decoding leakage.
> Could you give some indications on how to mute the RX when it is
> transmitting? Is it related to switching of the RX and TX of SBX? And do
> you think it is fast enough if I do it in host based software?

The simplest approach would be to call mute on a gr_mute block while you
are entering the send() function for a packet.

A more complicated approach would be to schedule the transmits with
timestamps so you know exactly what recv samples to throw out.

Thought of a few more:

3) The access code is already configurable parameter. Simply use a
different access code for each communication channel.

4) It would also be possible to put some kind of other identifiable
information into the packets. Use this information to discard unwanted


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