Re: USRP X300 Synchronization

[Hamed Al-Zubi]

Actually, I don't know. I thought that by using PC clock in UHD sink and source block in gnuradio allows synchronization. 
Also, I thought that Schmidl and Cox algorithm used for timing recovery in OFDM receivers.

On Thursday, May 18, 2023 at 10:46:38 AM CDT, Marcus Müller <mmueller@gnuradio.org> wrote:

Any OFDM receiver needs a timing recovery method anyways, so that has nothing to do with

how well your PC is suitable for synchronizing two devices.

On 18.05.23 17:43, Hamed Al-Zubi wrote:

> Thanks for your response, Marcus!

> I have observed a constellation rotation for OFDM subcarriers when I use the PC clock for

> synchronization. However, by using the channel model, I am able to see the QPSK

> constellation.

>

> Thanks!

> HZ

>

> On Thursday, May 18, 2023 at 10:35:01 AM CDT, Marcus Müller <marcus.mueller@ettus.com> wrote:

>

>

> No, it's several orders of magnitude worse and generally insufficient for anything where

> you need synchronization.

>

> Best,

> Marcus

>

> On 18.05.23 17:12, Hamed Al-Zubi wrote:

> Hello Dears,

>

> I would like to inquire about the synchronization of two USRPs X300, one acting as a

> transmitter (Tx) and the other as a receiver (Rx). If both USRPs are connected to the same

> laptop, I'm wondering if the accuracy provided by PC clock synchronization is similar (or

> close) to that achieved through GPSDO synchronization?

>

> Regards,

> HZ