[USRP-users] RE: DSP chain flushing for burst transmissions

Nowlan, Sean Sean.Nowlan at gtri.gatech.edu
Sat Oct 18 09:31:29 EDT 2014


> From: USRP-users <usrp-users-bounces at lists.ettus.com> on behalf of Nowlan, Sean via USRP-users <usrp-users at lists.ettus.com>
> Sent: Monday, September 22, 2014 6:39 PM
> To: USRP-users at lists.ettus.com
> Subject: [USRP-users] DSP chain flushing for burst transmissions ?
>
> Following up from discussions at the GNU Radio conference, it seems that many USRP users have a need for flushing
> the DSP chain (interpolation filters, CIC filter, etc.) in the FPGA when using the transmit burst interface. Using metadata
> headers for setting transmit time_specs and starts/ends of bursts is useful and works very well, but information and
> guidance about how many zero samples are needed to flush the DSP chain is sparse and undocumented. (To my
> knowledge, at least). Some things that would be helpful, in increasing level of effort:
>
>      1)      Documentation about how many zero samples must be transmitted to flush the DSP chain: if host sample-rate dependent, a
> formula or lookup table
>      2)      A tool/utility to automatically determine this number through a loopback test, etc.
>
> Thanks,
> Sean Nowlan

Any information about this would be greatly appreciated.
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