doesn't it look like the USB 2.0 is a heavily constraining bottleneck?
Yes, USB2.0 is the bottleneck.
And, if I'm not wrong about this, will it be possible in the future to
have a USRP <--> PC interface which doesn't limit us so much.
Other than 802.11, there aren't many applications that require more than
8 MHz of bandwidth. Radio astronomy is one, but you can use fewer bits
per sample with RA. It is not uncommon to use 1 or 2 bits per sample,
which would allow you to cover 128 and 64 MHz respectively.
There is an 8-bit per sample mode in the USRP which will allow you to
get 16 MHz of BW across the bus.
Matt
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