Tim!!!!!!
Yes i realized the same thing years ago. Wideband FM is a form of Analog FEC.
FM is amazing.
Mark
Reply by Tim Wescott●January 14, 20142014-01-14
One of the comments on the "VCO in a PLL" thread got me to thinking.
I remember being struck by the similarity in the waterfall curves between
FEC coding on the one hand, and FM radio on the other. One is in BER vs.
Eb/No, and the other is in output SNR vs. input SNR, but both are showing
that when you transmit a signal with redundant information you'll get
improved performance up to some noise threshold, and after that things go
to hell in a hurry.
Get the right book, or pair of books, and look at one and then the
other. Then allow yourself to be boggled by the similarities in the
curves.
There's something deep and philosophical in there, but I never managed to
grab onto it. I do think it's amazing that Major Armstrong managed to
INTUIT the advantages of frequency modulation at a time when most people
were still fumbling around trying to understand how carrier-wave
transmission worked.
--
Tim Wescott
Wescott Design Services
http://www.wescottdesign.com