On Sat, 2008-05-24 at 21:13 -0400, Achilleas Anastasopoulos wrote: > Chuck, Eric, > > I think there is a way to perform the cPLL at 8 complex Msps and > upsample to 16Msps only at the very end when you want to get the Real > signal out for further processing. I believe this works (i didn't see > any point where there is a possibility for aliasing) and it can result > in some savings in complexity without sacrifising performance. > Hopefully I didn't miss anything big... > > Take a look at the block diagram here: > > http://www.eecs.umich.edu/~anastas/gnuradio/pll.png >
That is interesting - for what it's worth, from empirical testing, Eric's interpolator actually worked with a rx-clock / symbol rate ratio of 1.487 = 16 / 10.76, altho with a few more visible errors, and using a really good signal (a 17 element beam a few hundred yards away from a 100kw transmitter ;). --Chuck _______________________________________________ Discuss-gnuradio mailing list [email protected] http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
