Re: [Discuss-gnuradio] gnuradio land speed record?

[Matt Ettus]

On 07/30/2010 09:33 AM, Clark Pope wrote:
> I'm curious what people do with the wideband capability of the
> gnuradio/usrp and what is the widest bandwidth signal one can really
> process with available computers?
>
> For reference I have a ~2.4 GHz core 2 duo laptop. For a 200 kHz FM
> demodulator I consume about 40% of one cpu. That's pretty much the
> simplest useful thing anyone can do so that maps to my laptop might
> be able to process 1 MHz bandwidth continuously.
>
> Similarly, my hard drive can't really keep up with 32 Mbyte/s
> recording. So if samples are 16-bit and you really can't afford lost
> data it seems like recording is limited to maybe 10 MHz or so
> bandwidth.
>
> However, with gigabit Ethernet you can send 100 Mbyte/s or more.
> What's the most anyone has recorded or processed continuously? What
> level of compexity was the processing?


With RAID arrays or SSDs, it isn't that hard anymore to sustain 100 MB/s 
recording to disk.  With 4 and 6 core systems and the i7 architecture 
you can get more than 5X the performance of your laptop.

There are a lot of applications using the full 25 MHz of RF bandwidth. 
You just need to pay a lot of attention to efficiency of your program 
and algorithms.

Matt