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Article #12392Re: Radiopaquete rápido con la tarjeta de sonido???
From: Xavier Montero
Date: Sat, 28 Jul 2001 18:36
Date: Sat, 28 Jul 2001 18:36
32 lines
2777 bytes
2777 bytes
> 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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X-Google-Language: SPANISH,ASCII X-Google-Thread: 102d4d,bf59d03ee4a3136d X-Google-Attributes: gid102d4d,public X-Google-Thread: f86c8,bf59d03ee4a3136d X-Google-Attributes: gidf86c8,public X-Google-ArrivalTime: 2001-07-28 12:06:06 PST Path: arc1-ca.pugleaf.net!archiver1.google.com!newsfeed.google.com!newsfeed.stanford.edu!newsfeed.gamma.ru!Gamma.RU!opentransit.net!newsfeed.comtenidos.com!newsfeeder.wanadoo.es!news.antakira.com!not-for-mail 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 Organization: Digital Sound Items Lines: 32 Message-ID: <3B63063B.41613E03@dsitelecom.com> References: <9jho2u$kgi$1@news.wanadoo.es> <3B5ED611.B2AD955@wanadoo.es> <9jn2ue$knv$1@news.wanadoo.es> <3B5FEDAC.E70D7526@wanadoo.es> <3B630073.274116DA@dsitelecom.com> NNTP-Posting-Host: 212.25.147.135 Mime-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Transfer-Encoding: 8bit X-Trace: news.wanadoo.es 996346965 18305 212.25.147.135 (28 Jul 2001 19:02:45 GMT) X-Complaints-To: usenet@wanadoo.es NNTP-Posting-Date: Sat, 28 Jul 2001 19:02:45 +0000 (UTC) To: Xavier Montero <xmontero@dsitelecom.com> X-Mailer: Mozilla 4.77 [en] (Windows NT 5.0; U) X-Accept-Language: en