Re: [Discuss-gnuradio] Predictable latency?

[Brian Padalino]

On Tue, Aug 19, 2008 at 11:21 AM, Thomas Schmid <address@hidden> wrote:
> This is correct. Your samples go through buffers, and therefore it is
> hard to predict the latency each and every sample will have to get
> from software to the USRP. I did a study on this a while back. If you
> are interested, you can find the paper here:
> http://nesl.ee.ucla.edu/document/show/242
>
> What you can do though is calculate the minimum and the maximum
> latency that the samples will have. Also, I am not sure how far the
> mblock and GNU Radio is in regards to timestamping outgoing samples (I
> didn't follow the GNU Radio development lately) is, but if you can
> tell the USRP when to send out which sample, then you could easily
> predict the latency itself.

I believe the TX direction for the m-block/inband signaling in the
FPGA works well, but the RX has issues with providing the actual
timestamp of the received sample block (which will be fixed soon).

Brian