[USRP-users] SBX daughtercard bandwidth problem..!!

salman dinani salmandinani at gmail.com
Sun Feb 12 23:01:07 EST 2012


Thanks Josh and Ian Buckley....:) So it means:
1. I cannot set the decimation or interpolation to "1" in simulink SDRu
block? or in other words i        cannot get the sampling rate of 100
MSPS?? :(

2. Is there any way using Simulink SDRu block??

Regards

Salman Dinani

On Mon, Feb 13, 2012 at 2:06 AM, Ian Buckley <ianb at ionconcepts.com> wrote:

> Clearly I needed more coffee!
> You confused me there referring to it as a 16bit mode rather than 8bit
> complex.
>
> On Feb 12, 2012, at 9:47 AM, Josh Blum wrote:
>
> >
> >
> > On 02/12/2012 09:36 AM, Ian Buckley wrote:
> >> Josh,
> >> It's possible you didn't have your Sunday morning coffee yet, or
>  possibly that the laws of Physics have been shattered...
> >> but did you really intend to state that you can now receive 16bits @
> 50Msps in UHD...because Cisco would like to offer you a job if so :-)
> >> I'm assuming you intended to say 8bits at 50Msps.......or is it not a
> complex sample stream in this new mode?
> >
> > sorry, no coffee yet, but the math seems solid
> >
> > 1 byte real, 1 byte imaginary = 16 bits per sample (complex baseband)
> >
> > 16 bits per sample * 50 Msps = 800 Mbits per second, which is well
> > within gigE rate of 1000 Mbits per second.
> >
> > -Josh
> >
> >>
> >> -Ian
> >>
> >> On Feb 11, 2012, at 10:58 PM, Josh Blum wrote:
> >>
> >>>
> >>>> 1. Am i write in this conclusion??
> >>>
> >>> Correct.
> >>>
> >>> However, it is possible to increase sample rate at the expense of
> >>> dynamic range. On the UHD master, you can receive 50Msps with 16 bit
> >>> samples. This feature is not yet a part of the SDRu driver.
> >>>
> >>>> 2. If yes, than why it is written in application notes tat it has BW
> of 40
> >>>> MHz??
> >>>
> >>> This is an analog bandwidth filter. You cannot receive signals outside
> >>> LO +/- 20Mhz due to the filter. Consider that some may tune the LO away
> >>> from the center frequency for various reasons.
> >>>
> >>>> 4. Why i am not able to set decimation or interpolation to 1.??
> >>>
> >>> The bandwidth bottleneck is the gigabit ethernet port. Given the recent
> >>> advent of 16 bit samples, a decimation of 2 is really the minimum.
> >>>
> >>> This is a user mod to burst 100Msps packets, which you may find
> helpful:
> >>>
> https://lists.gnu.org/archive/html/discuss-gnuradio/2011-03/msg00303.html
> >>>
> >>> -Josh
> >>>
> >>> _______________________________________________
> >>> USRP-users mailing list
> >>> USRP-users at lists.ettus.com
> >>> http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com
> >>
>
>
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