In a word, NEVER. No self respecting communication systems designer
would allow that much excess bandwidth on the air or any realistic
transmission medium.
Typically 2-3 samples per baud is more than enough. You then use a
polyphase filter bank based clock recovery tool to FIND the correct
upsampled phase (at SAY, 6-10 samples per baud) but you never operate
the demodulator at that much oversampling.
I think Tom has finished and checked in the PFB based clock recovery
based on the work by fred harris last summer-ish. Am I right? If not,
if I may be off assistance in finishing, I will.
Bob
On 8/8/2010 5:00 PM, Tom Rondeau wrote:
On Sun, Aug 8, 2010 at 1:41 PM, Thunder87<thunderbolt...@mail.ru> wrote:
Thunder87 wrote:
If so, what is maximal and minimal safe "samples/symbol" to "samp_rate"
rates?
Minimal "samples/symbol" is 2.
Is there a maximal ?
215 is a pretty outrageous number to use; you should never need to
oversample that much.
2 to 4 is typical, 6-10 is about the highest you probably want to go.
Tom
_______________________________________________
Discuss-gnuradio mailing list
Discuss-gnuradio@gnu.org
http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
--
(Co)Author: DttSP, Quiktrak, PowerSDR, GnuRadio
Member: ARRL, AMSAT, AMSAT-DL, TAPR, Packrats,
NJQRP, QRP ARCI, QCWA, FRC.
“Be yourself, because the people who mind don't
matter. And the people that matter don't mind."
-Dr. Seuss
Active: Facebook,Twitter,LinkedIn
_______________________________________________
Discuss-gnuradio mailing list
Discuss-gnuradio@gnu.org
http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
