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Article #12392

Re: Radiopaquete rápido con la tarjeta de sonido???

#12392
From: Xavier Montero
Date: Sat, 28 Jul 2001 18:36
32 lines
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> tambi�n se podr�a interpretar como el 20-PSK con muchas amplitudes
> que cubrir�an los puntos interiores (APSK??)

Me quoteo y complemento: Donde yo dije APSK, lo pues con
interrogantes porque hace varios a�os que no le�a literatura
a fondo del tema, en el Communication Systems, de Bruce
Carlson, editado por la McGraw Hill le llaman APK.

Cito el libro, en la p�gina 550 de la tercera
edici�n, para demostrar que no tiene sentido entrar en la discusi�n
de si QAM/APK es lo mismo o no porque s�lo son dos interpretaciones
de lo mismo:

[entre corchetes lo a�ado yo]

[Hablan de se�ales ASK coherentes] Suppose that two of these ASK
signals are transmitted on the same channel via quadrature-carrier
multiplexing, which requires no more bandwith than [only] one signal.
Let the information come from an M-ary source with M = u^2 [usan la
mu (micro) en vez de la u, al cuadrado], so the message can be
converted into two u-ary digit streams, each having the same rate
'r'. [Ahora viene lo que me interesa] We could describe this process
as u-ary QAM, but the more common designation APK emphatizes the
property that the source symbols are represented by amplitude and
phase modulation. Even so, the performance of APK fundamentally
depends upon the u-ary error rate and therefore will be superior
to direct M-ary modulation with M > u.

Saludos!
Xavi.

EB3ANC.
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From: Xavier Montero <xmontero@dsitelecom.com>
Newsgroups: es.comp.os.linux.programacion,es.comp.os.linux.redes
Subject: Re: Radiopaquete rápido con la tarjeta de sonido???
Date: Sat, 28 Jul 2001 20:36:43 +0200
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