Re: [Discuss-gnuradio] Switching from the receiving mode to the transmitting mode?

[Eric Blossom]

On Thu, Oct 09, 2008 at 12:24:26PM -0500, Zenny Zhang wrote:
> Dear All,
> 
> I am working on an application where I have a sender S and a receiver
> R. The procesure runs as follows:
> 
> (1) S transmits the channel estimation sequence. R estimates channel.
> (2) S switches to receiving mode. R switches to the transmiting mode.
> R sends the channel estimation back to S.
> (3) S switches back to transmiting mode. R switches back to the
> receiving mode. S sends data to R.
> 
> For both S and R, I created two flow graphs, one for transmiting and
> the other for receiving. When switching modes, I was basically
> starting and stopping flow graphs. I found that I have to stay in step
> (1) and (2) for at least 0.1 sec. Are you aware of any faster method
> to do this? Thanks so much for any hint!
> 
> Best regards,
> Zhenghao

Use Auto Transmit/Receive switching (ATR) and see tunnel.py for an
example that uses it. (It's a terrible example of a MAC, but does show
how to set up something similar to what you want.)  No need to stop
the flow graphs.

Eric