[srslte-users] Why setting sampling rate multiplied by 4?

[Enes ÜNAL]

Thanks for the clarification Tom,

Enes.

11 Nis 2017 Sal, 04:29 tarihinde, Tom Tsou <tom at tsou.cc> şunu yazdı:

> On Mon, Apr 10, 2017 at 7:09 AM, Ismael Gomez
> <ismael.gomez at softwareradiosystems.com> wrote:
> > Yes I think it should work well setting the master clock rate to the
> > sampling rate. I think at some time we found better results in terms of
> USRP
> > latency when operating at low sampling rates. But that might be fixed
> > already. Have you tried setting it to the sampling rate?
>
> I just want add that there are two considerations here focusing on the
> B200/B210.
>
> 1. The long term stable UHD release series - 3.9.x - supports master
> clock rates down to 5 MHz, which means that the lowest LTE sample
> rates (1.92 and 3.84 MHz) require oversampling. The regular 3.10
> release series does not have this limitation and can handle all
> relevant LTE sample rates directly.
>
> 2. Regarding latency, oversampling will generally result in shorter
> latencies due to faster clocking with both the FPGA and RFIC. That
> said, oversampling group delay is affected by the sample rate
> converters, so the behavior is not a simple one-to-one relationship.
> For latency critical applications, developers will need to either
> perform timing measurements and/or testing for the required
> configuration(s).
>
>   -TT
>
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