Johannes Stezenbach wrote:
According to my current understanding, all parts of
the S2 descriptor might be relevant to receive NBC-BS in
MIS or BC-BS mode, except for the scrambling_sequence_index,
where I have no idea what it is good for.
(I guess the scrambling_sequence_index might be used
for better seperation of two seperate DVB-S2 signals transmitted
Yes, i too think that way. It improves data reliability, as i read from
a couple of places.
on adjacent channels; can anyone shed a light on it? Is it
used for BS at all???)
From a document from Altera ..
Gold codes are a set of specific sequences found in systems employing
spread spectrum or code-division multiple access (CDMA) techniques.
These systems are often used in communications equipment such as
cellular telephones, global positioning systems (GPS), and Very Small
Aperture Satellite Terminals (VSATS). Gold codes have cross-correlation
properties necessary in a multi-user environment, where one code must be
distinguished from several codes existing in the same spectrum.
Found something interesting..
http://www.freshpatents.com/Method-and-apparatus-for-minimizing-co-channel-interference-by-scrambling-dt20051229ptan20050286405.php?type=description
In broadcast applications, continuous mode modems 105 are widely used.
Codes that perform well in low signal-to-noise (SNR) environments are at
odds with these modems with respect to synchronization (e.g., carrier
phase and carrier frequency). Physical layer header and/or pilot symbols
can be used for such synchronization. Accordingly, an important
consideration with respect to system performance is that of co-channel
interference on physical layer header and/or pilot symbols. Because
physical layer header and/or pilots are used for acquiring and/or
tracking carrier phase, carrier frequency, such interference can degrade
receiver performance.
Manu
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