Xcvr2450 and MIMO

GNU Radio
1

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 ?

BR/
Per

2

On 01/18/2010 12:49 PM, Per Z. 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

3

Matt E. wrote:

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 ?

BR/
Per

4

On 01/18/2010 09:23 PM, Per Z. wrote:

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