Manu Abraham wrote:
Richard Mayo wrote:
I am trying to find out about a feature of DVBS-2, the 90 symbols of
un-scrambled data, Physical Layer Signalling (PLS) code, which occurs a
regular intervals. Is the content constant or predictable?
PLSCODE aka Pilot tones are used to identify the Physical Layer params.
This is part of the DVB-S2 specification at the Physical Layer, nothing
abnormal. Some demods allow you to extract the Header, while some do
not. So it depends a lot on which demodulator you are using. Some handle
it in firmware while some do it in the driver.
The PLPARMS cannot be scrambled, since it contains very basic
information. According to the specification, the MODCOD can change at
any given instance of time. This information is present in the Physical
Layer. So therefore a lot will depend on how constant your MODCOD is "at
the least".
Manu
Thanks Manu,
I'm not demodulating the signal, I just wish to identify it with a
receiver with very poor S/N. So what information does it contain?
TTFN
Richard.
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