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Re: [Discuss-gnuradio] USRP B200 host BW with USB 3.0/2.0

From: Ralph A. Schmid, dk5ras
Subject: Re: [Discuss-gnuradio] USRP B200 host BW with USB 3.0/2.0
Date: Thu, 29 Jan 2015 16:35:58 +0100

I made tests with the bladeRF at 30 MHz bandwidth, and I was able to see the spectrum just fine, not matter if I used a USB2 or a USB3 cable. No hacks, no switching chunks of the spectrum, just using a standard receiver program. The lost samples are not a problem as longs as you do not want to listen in.



From: address@hidden [mailto:address@hidden On Behalf Of Jorge Gallo
Sent: Thursday, January 29, 2015 4:07 PM
To: Martin Braun
Cc: GNURadio Discussion List
Subject: Re: [Discuss-gnuradio] USRP B200 host BW with USB 3.0/2.0




The alternative of a USB 3.0 is not having 5 USRPs. It is just reading 5 times at different centrer frequencies in order to get 40MHz information although that information will not be gathered at the same time.


For my application I just need to "see" the sprectrum. I do not need to demodulate data so that it would be fine to proceed that way. However i would rather get 40MHz in a row.


Many thanks, 



On 29 January 2015 at 14:07, Martin Braun <address@hidden> wrote:

On 01/29/2015 01:48 PM, Jorge Gallo wrote:
> I understand the given values of host bandwidth for each protocol:
> USB 2.0                  8 (MS/s @ 16-bit I/Q)

If you go down to 8-bit I&Q, you will get twice that amount, if that's
any help.

> USB 3.0                61.44 (MS/s @ 16-bit I/Q)
> However I would like to process 40MHz of analogue BW in GNURadio over
> USB 2.0
> I fully understand  a continuous reception is not possible to manage
> since it would require 40 IQ MS/s and I am limited to 8MS/s.
> However, is it possible to take snapshots of 40MHz over the time so that
> I am able to receive bits of 40MHz with USB 2.0 which are not continuous
> in time?
> Are there buffers in the FPGA that manage this kind of operation?

None big enough for anything useful.

It seems like attaching a USB3.0 connector would be simpler than running
5 USRPs? Not that I would complain about the sales :)


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