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Re: [Discuss-gnuradio] USRP hardware purchase

From: Eric Blossom
Subject: Re: [Discuss-gnuradio] USRP hardware purchase
Date: Thu, 16 Aug 2007 02:25:39 -0700
User-agent: Mutt/1.5.9i

On Wed, Aug 15, 2007 at 06:56:17PM -0700, Dan Halperin wrote:
> On top of that, an (extremely, I think) optimistic lower bound for
> latency in a GNU radio system is over 1 millisecond from the RX antenna
> through the FPGA over the USB to the computer to your software back over
> the USB and out the TX antenna. This makes it _reallllllly_ hard to get
> the 10 _microsecond_ turnaround required for an 802.11b ACK, and carrier
> sense is meaningless with such a latency.

I think 100us is possible if you're mindful of the buffer sizing.

I concur that 10us is not going to happen on the host ;)


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