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 _______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
