On Fri, May 13, 2011 at 11:12 AM, Yang
<address@hidden> wrote:
Hi all,
I am working on the implementation of dynamic spectrum access with gnuradio and usrp2. I modified usrp_spectrum_sense for usrp2 to do the sensing job. However, I find the sensing speed is intolerably slow, which is about 1s for 1MHz.
Yang,
Considering that the USRP2 can sample 25 MHz, you should be able to capture that bandwidth instantaneously. It then matters what algorithm you are using and how many samples you require to make your sensing decision.
In general, you probably want to avoid making any decisions on the bandedge (maybe 10 - 20%) due to filtering. So if you are planning on sweeping a spectrum, it would probably be best to change the center frequency be less than the bandwidth of the receiver so that you have some overlap. Also, you will have to allow for some amount of settling time after changing frequencies.
Tom
I try to reduce the fft size but no significant improvement. My goal is to sense 4MHz in 10ms or so. I am wondering any ideas to improve the speed? Or is there any other ways to sense faster?
Any help would be appreciated! Thank you.
--
Yang
Sent with Sparrow
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