[srslte-users] New numerology in srslte

[Justin Tallon]

Hey Zhouyou,

If you want to play with the subcarrier spacing my advice would be to pick
a number of subcarriers you are happy with and then change the sampling
rate at which it runs.

The easiest way this could be done is with a scaling parameter, scaling the
sampling rate by some factor. You will also need to change the timing being
sent to your RF frontend as this is passed in milliseconds, not samples so
this will also need to be scaled.

In addition, pay attention to anywhere the subcarrier spacing (15000) is
used explicitly, especially in CFO calculations.

Regards,
Justin
____
Justin Tallon Ph.D.

Software Radio Systems (SRS)
http://www.softwareradiosystems.com

+353-86-067-0753 | justin.tallon at softwareradiosystems.com


On Tue, Mar 31, 2020 at 5:24 PM Zhouyou Gu <guzhouyou at gmail.com> wrote:

> Dear srsLTE team,
>
> I am trying to implement a shorter TTI in srsLTE
> My platform is B210 and dell computer.
>
> To implement the shorter TTI, I have changed the subcarrier spacing to
> 30kHz (x2 than the original) and doubled the subcarrier spacing for PRACH
> as well.
> In addition, I have changed the clock rate setting.
>
> After I did this, srsUE cannot find the cell.
>
> What do you think about this idea?
> Is it possible on my platform (B210).
>
> If yes, what else may also need to be changed?
>
> Thanks a lot!
>
> Regards,
> Zhouyou
>
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