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List:       gnuradio-discuss
Subject:    Re: [Discuss-gnuradio] USRP bandwidth and FIFOs
From:       Matt Ettus <matt () ettus ! com>
Date:       2007-09-30 6:28:49
Message-ID: 46FF4221.8020904 () ettus ! com
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Andrey A wrote:
> Hello!
>
> I have two questions about USRP:
>
> 1. It is stated on
> http://www.comsec.com/wiki?UniversalSoftwareRadioPeripheral that USRP
> can sustain 32 megabytes per second over USB2.0.
> I'm about to build MIMO 2 antenna transmitter. As I and Q each occupy
> 16 bits, for two-antenna sample it will require (16*2) * 2 = 64 bits
> or 8 bytes. As a result I can get 32 / 8 = 4 mega samples per second
> and from Nyquist theorem only 2 MHz wide signals could be transmitted.
>
>   

4 MS/s COMPLEX gives a 4 MHz nyquist band, since it is complex samples.

> Please advise whether my reasonings are right.
>
> 2. What are the TX and RX FIFO buffers' sizes on the board?
>   

2K lines, IIRC

Matt



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