On 11/11/2010 10:46 AM, Vladutzzz wrote: > Dear all, > I am trying to receive with my USRP2 + WBX daughterboard a signal band of > precisely 8 MHz in order to measure it's power. > The problem is that since USRP2 has a 100 MSample/s sampling and I can't > just devide it by 12.5 to get the desidered 8 MHz band, I need > to use an FPGA decimation of 100 together with an interpolation of 8 in > order to get the desidered results > (I am not using decim 25 and interpol 2, because it is said in the > specification of USRP2 that both parameters have to be at least 4, and > multiples of 4, in order to get the full band). > > Is this the only way of going about this operation? > > Doesn't this eliminate too much usefull information? > > Please let me know if you would this in a different way! > Thank you for your time! > > Vlad. > I'm confused. Interpolation is generally used on Tx, rather than Rx.
What I would do, is specify a decimation of 10, giving you 10MHz of bandwidth into the host, and then filter the result down to 8MHz, and measure that with a complex-to-mag-squared, followed by a single-pole IIR filter. -- Principal Investigator Shirleys Bay Radio Astronomy Consortium http://www.sbrac.org _______________________________________________ Discuss-gnuradio mailing list [email protected] http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
