On 01/18/2010 09:23 PM, Per Zetterberg wrote:
Matt Ettus wrote:
On 01/18/2010 12:49 PM, Per Zetterberg wrote:
Dear All.
I think I read on the list that xcvr2450 doesn't support MIMO (frequency
coherent transceivers to be more precise). However, when I search for
xcvr2450 and MIMO in the archives I don't find any post on this.
Can somebody update me on this ?
You CAN do MIMO with the XCVR2450. However, phased arrays (where you
need to know the absolute phase difference between boards) will be
hard due to the fractional-N synthesizer.
The only board which is not MIMO capable is the TVRX.
Matt
That's great! But doesn't the same problem (fractional-N synthesizer)
also apply to the RFX? I think I have seen this phase-shift. I have used
my own db driver most of the time - does the proper driver fix this ?
There will be a phase ambiguity with all the PLLs, but there is a small
number of possible phase differences with an integer-N PLL (roughly
equal to the R-divider), while there are thousands with a fractional-N.
Matt
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