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Re: [Discuss-gnuradio] How to synchronize two transmitters

From: yend B.
Subject: Re: [Discuss-gnuradio] How to synchronize two transmitters
Date: Fri, 27 Jan 2012 22:32:28 +0200

Thanks for the reply!
If I use one computer, I would even combine and stream them to the same USRP antenna. What I wanted to have is two independent
transmitters ( primary and secondary) transmitting over the same channel. The secondary (cognitive) transmitter will have to
synchronize to the primary transmission so that it can encode its message (eg. dirty-paper coding) to mitigate the interference.
On Fri, Jan 27, 2012 at 8:16 PM, André Selva <address@hidden> wrote:
What I think that might be a solution is using only one computer with two USRPs. In the flowgraph, you will have two sinks. If your network card are both identical and the distance between the USRPs are not large enough to be considered, I don't see why the signals would not be syncrhonized (or, at least, very similar to each other).


2012/1/22 yend B. <address@hidden>
I was wondering if there is a way to syncrhonize two transmitters running on two machines.
Both transmitter use OFDM. I could use a shared reference clock, but the problem is that
I don't know how exactly I can send packets SIMULTANEOUSLY from both transmitters.
I want to measure co-channel interference and study multiuser detection alogorithms.

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André F. B. Selva -
SECOMP - Semana da Computação da Unicamp 2012
Coordenador Geral
CACo - Centro Acadêmico da Computação

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