Transmit time synchronization

GNU Radio
1

Hello all,

Ive been trying to achieve transmit time synchronization for over a
month
now using GNURadio and USRP B200, and so far i have had limited success.
I
could not find alot online. My question is simple. Is it possible to
achieve synchronization between two USRPs without using an external
signal
or the GPSDO?

If so a little guidance would be much appreciated. Thanks.

2

Hello Muhammad Shahmeer Omar,

with neither an external signal or a GPSDO, this is physically
impossible.

I think with external signal you mean the PPS signal; you can of course
use a reference signal and build synchronization in software. That is a
problem equivalent to synchronization in communication systems, e.g.
synchronization of mobile phones to a base station.

Best regards,
Marcus M?ller

3

Thanks Marcus!

Is it possible to synchronize the usrps using individual gpsdo modules
for
each board or is a central distribution system (like the octoclock)
necessary?
Hello Muhammad Shahmeer Omar,

with neither an external signal or a GPSDO, this is physically
impossible.

I think with external signal you mean the PPS signal; you can of course
use
a reference signal and build synchronization in software. That is a
problem
equivalent to synchronization in communication systems, e.g.
synchronization of mobile phones to a base station.

Best regards,
Marcus Müller

On 12/07/2014 04:09 PM, Muhammad Shahmeer Omar wrote:

Hello all,

Ive been trying to achieve transmit time synchronization for over a
month
now using GNURadio and USRP B200, and so far i have had limited success.
I
could not find alot online. My question is simple. Is it possible to
achieve synchronization between two USRPs without using an external
signal
or the GPSDO?

If so a little guidance would be much appreciated. Thanks.

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