On 01/20/2021 05:34 PM, Spam Blocker via USRP-users wrote:
We have an application that requires about 640Mbps of transmit and
640Mbps of receive samples bandwidth. We have a high performance
Dell laptop hooked to a B205.
Questions:
1. Do the different versions of UHD support different throughput rates?
For the B2xx series, the different UHD versions will show only very
minor difference in maximum achievable sample rates.
2. Are there maximum sample rates for the B205 that would restrict the
throughput reaching the numbers we need.
The maximum sample rate of the B2xx is 56Msps in each direction, which
means roughly 56MHz of bandwidth into and out of your
application. How that translates into *mbits* of data depends very
very very much on your particular application, coding efficiency,
modulation efficiency, channel characteristics, Eb/No, etc. That's up
to you and your particular application, and whatever your
compute platform can deliver.
The USRP SDRs don't inherently *know* anything about what you're doing
*within* the bandwidth they dutifully transport back and forth.
Higher order modulations and coding schemes take more compute power,
so that's almost always your limiting factor.
3. Is there a receive and transmit throughput test that I can use to
see what the maximum is for our platform?
Thanks
K-
There is the "benchmark_rate" test application that is usually located in:
<prefix>/uhd/examples
This will give you an idea of what your computer can move back-and-forth
between itself and the USRP, absent any additional load from
doing anything "real" with those samples.
I would spend some time here:
https://kb.ettus.com/Knowledge_Base
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