[linux-dvb] [PATCH-REWORKED] frontend.h add dvb-s2 support including backwards compability

Manu Abraham abraham.manu at gmail.com
Fri Feb 24 15:36:50 CET 2006


Klaus Schmidinger wrote:
> Manu Abraham wrote:
>>
>> so it could possibly be, IMHO
>>
>> * PSK_B
>> * PSK_Q
>> * PSK_8
>> * PSK_16A
>> * PSK_32A
>
> Why not go all the way to
>
> * PSK_2
> * PSK_4
> * PSK_8
> * PSK_16A
> * PSK_32A
>
> (assuming 'B' stands for Bi-something and 'Q' for Quad-...)

BPSK = (B)inary (P)hase (S)hift (K)eying
BPSK is the simplest form of Phase Shift Keying. I think DSS uses BPSK

it is also termed as 2PSK, the phase difference is 180 degrees, and 
hence occupies two positions in the constellation diagram.


QPSK = (Q)uadrature (P)hase (S)hift (K)eying

In this case the phase difference is 90 degress and occupies 4 positions 
in the constellation diagram
can be called as 4PSK too.



>
> Just an idea - was wondering why some have letters and others have 
> numbers.
>


Easier for the tongue, maybe. All are the same. Suggestion sounds good..


Manu





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