I've been learning about software defined radio from the ground up and my maths are a bit shaky and I'm mainly a software guy, so concepts of signals and whatnot are rather foreign to me. So as I've been reading, I've taken lots of tangents to review what must seem like completely elementary concepts along the way. I fully understood what ADCs and DACs do, but I didn't have any clue what complex sampling really was. I ended up stumbling across a document from 1958 that seems to be when the concept of complex sampling was developed. Please do correct me if I'm wrong, but either way- this document seems to do a great job of explaining some of the maths of complex signals and with a small trigonometry review, it should be more clear just what a complex signal really is doing. I imagine most of the folks on this list are well past needing this type of review, but I'd highly recommend reading this if you need some of the basics. It pertains in large part to Frequency Modulation. Without further ado, here's the URL: http://handle.dtic.mil/100.2/AD636038 I've also found the JNL Research Group's gnuradio tutorial invaluable (and is linked to in several places on the gnuradio pages IIRC) (http://www.nd.edu/~jnl/sdr/docs/) I found a fairly good article on Cascaded Integrator-comb filters as well (http://www.us.design-reuse.com/articles/article10028.html) http://www.dspguru.com has quite a bit of useful background too for folks like me that need a lot of terminology defined. All this may be referenced/linked elsewhere, but I figured I'd share what has been useful to me so far.
on 2007-05-19 10:18