[USRP-users] Re: Synchronization of two USRP x310s

Wed, 26 Jan 2022 00:31:17 -0800

Is there a resource for synchronizing multiple USRP x310s without an external reference clock?

 

Also, would SBX-120 daughterboards perform better when using multiple USRPs because of its phase sync feature?

 

V/r

 

LoyCurtis Smith

 

From: Marcus D. Leech
Sent: Tuesday, January 25, 2022 11:14
To: LoyCurtis Smith
Cc: [email protected]
Subject: Re: [USRP-users] Re: Synchronization of two USRP x310s

 

On 2022-01-25 11:12, LoyCurtis Smith wrote:

Would their mechanism included UHD based code?

Since UHD is the way ANY application talks to the radios, yes.  But I have no idea if OAI, as one of dozens and dozens of different appilcations
  "out there" has any way to support that functionality.


 

Also, I assume that the only other option would be to purchase an Octoclock or some other clock distribution module?

Yes, you'd need some kind of shared 10MHz reference clock and 1PPS source, AND your application needs to be able to configure the radios to
  use it.



 

On Tue, Jan 25, 2022 at 10:40 Marcus D. Leech <[email protected]> wrote:

On 2022-01-24 20:53, LoyCurtis Smith via USRP-users wrote:

My system setup is as follows: 

·        2 x USRP x310 with CBX-120 daughterboard

·        2 x Ubuntu 18.04 workstation

·        2 x Taoglas 45.8113 antenna

·        2 x  Internal Reference Clock (Master Clock set at 184.32 MHz)

·        2 x Internal Time source 

·        2 x Connected via 1 Gig-E interfaces

·        2 x Using UHD 4.1

The devices have been in two setups: stacked and a few inches apart. 

 

I am attempting to deploy a 5G network using the openairinterface (OAI) software system. Both devices synchronize initially, then they fail. With openairinterface, I am using frequency offset compensation at the UE. Its a useful parameter when running over the air and/or without an external clock/time source (https://gitlab.eurecom.fr/oai/openairinterface5g/blob/develop/doc/RUNMODEM.md)

 

Is there a way to synchronize the reference clock/timing of both USRP x310s over the air? In the future, I will be attempting to connect a third USRP x310. My setup will include one base station and two user devices. 

 

V/r

 

LoyCurtis Smith

 

Unless OAI provides some mechanism for that, the answer would be no.  You need a shared reference clock.


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V/r

 

LoyCurtis Smith

 

 

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