[USRP-users] Full-duplex MIMO issues with B210 board

Ian Buckley ianb at ionconcepts.com
Fri Apr 10 14:00:18 EDT 2015


The 30.72MHz issue is now resolved in UHD @ HEAD of both maint and master.
If anyone see's any further issues @30.72MHz with 2x2 operation please let us know.
-Ian

On Mar 19, 2015, at 1:29 PM, Tom Tsou <tom at tsou.cc> wrote:

> On Thu, Mar 19, 2015 at 1:52 AM, Ian Buckley via USRP-users
> <usrp-users at lists.ettus.com> wrote:
>> Marcus,
>> You've been given bad information by R&D…RX and TX H/W paths are orthogonal…2x2 MIMO@ 30.72MHz is a legal configuration. (It is however the maximum legal sample rate for this configuration)
> 
> Confirming the following B210 items:
> 
> * 2x2 MIMO at 30.72 MHz is a valid configuration.
> * Full-duplex or Rx/Tx only does not restrict the clock rate setting.
> * Operation with 2x2 MIMO at 30.72 MHz may generate bit-level errors.
> 
> Ettus R&D has reproduced and diagnosed the clocking issue and a fix is
> in progress. In the meantime with 2x2 MIMO, master clock rates that
> approach the maximum allowable value of 30.72 MHz should be avoided.
> Single channel operation is not affected.
> 
> For 2x2 LTE purposes, clocking at 7.68 or 15.36 MHz provides coverage
> up to 15 MHz channels. 20 MHz LTE can be covered with 23.04 MHz clock
> and sample rates.
> 
>  -TT





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