[USRP-users] Help improving USRP B200 throughput

Jason Heym jpheym at gmail.com
Thu Sep 4 16:57:53 EDT 2014

Bumping this thread...

Any suggestions?

On Fri, Aug 29, 2014 at 6:47 PM, Jason Heym <jpheym at gmail.com> wrote:
> I have been testing a recently-purchased USRP B200 with an Asus G750 laptop.
> My goal is full duplex 32 million samples/second TX and RX.
> Reliability is very important. This is for some radar experiments that
> need maximum TX and RX bandwidth continuously for periods of several
> minutes.
> Please see the attached test results.
> Note I'm doing TX and RX of 50M samples for each run. So each run
> represents a few seconds of TX and RX. Fewer samples per run will have
> less chance of interruption and produce higher success rates. But my
> goal is interruption-free operation over at least a few minutes.
> Basically for 2 to 8 MSPS symmetric (TX and RX) reliability is around
> 50% to 60%. At 16 MSPS reliability drops to 25%. At 32 MSPS there is
> total failure. Reducing the RX data rate while keeping the TX rate
> fixed can improve success rates. However the opposite (reducing TX
> data rate and keeping RX fixed) does not help. I do need symmetric
> data rates.
> What can I do to improve the throughput or better diagnose and address
> the problem?
> I prefer a laptop for portable / field operation. This laptop performs
> well with a Point Grey Grasshopper3 USB 3.0 camera, achieving 350
> MB/second error-free for extended periods (a few hours). Obviously
> this is mostly camera-to-host throughput, not symmetric full duplex.
> The B200 and AD9361 have enormous potential. I just need to improve
> the throughput situation. I recognize that USB 3.0 SuperSpeed has its
> challenges, probably especially for full-duplex symmetric throughput.
> Thank you!
> Jason Heym

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