elettronica dei sistemi wireless lm ingegneria elettronica a.a. 2011/2012
TRANSCRIPT
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Elettronica dei Sistemi Wireless
LM Ingegneria Elettronicaa.a. 2011/2012
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A.A. 2011-2012X Lezione
Sommario
• Metodi di accesso al canale (TDMA, FDMA …• …. CDMA• Sistemi numerici di telecomunicazione
– Richiami e integrazioni sulle modulazioni numeriche
– Architettura di un sistema numerico di ricetrasmissione
– Modulatori universali
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Bit stream (time domain)
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Bit stream (frequency domain)
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Effetto della moltiplicazione per PN nel dominio del tempo
Bit stream
Chip stream
B(t) x C(t)
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Effetto della moltiplicazione per PN nel dominio della frequenza
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…ancora nel dominio del tempo
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….nel dominio della frequenza
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Perché trasmissioni numeriche?
Materiale tratto da
Agilent Technologies:
Digital Modulation in Communications Systems -
An Introduction
Application Note 1298
Agilent Technologies: Digital Modulation in Communications Systems -
An IntroductionApplication Note 1298
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Tradeoff “complessità vs.efficienza spettrale”
Agilent Technologies: Digital Modulation in Communications
Systems - An Introduction
Application Note 1298
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Evoluzione
Agilent Technologies: Digital Modulation in Communications Systems -
An Introduction - Application Note 1298
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Modulazioni di fase e di ampiezza
Agilent Technologies: Digital Modulation in Communications Systems -
An Introduction - Application Note 1298
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Modulatore universale I-Q
Agilent Technologies: Digital Modulation in Communications Systems -
An Introduction - Application Note 1298
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Demodulatore IQ
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Modulazioni digitali più diffuse e loro applicazioni
16VSB= 16 level vestigial sideband
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Costellation e vector diagram
Agilent Technologies: Digital Modulation in Communications Systems -
An Introduction - Application Note 1298
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Transizioni di simbolo: effetti sull’inviluppo
Agilent Technologies: Digital Modulation in Communications Systems - An Introduction - Application Note 1298
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Offset QPSK: costellazione
Agilent Technologies: Digital Modulation in Communications Systems -
An Introduction - Application Note 1298
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Modulazioni a inviluppo costante e non
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Agilent Technologies: Digital Modulation in Communications Systems - An Introduction - Application Note 1298
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Agilent Technologies: Digital Modulation in Communications Systems -
An Introduction - Application Note 1298
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Effetto della limitazione in banda del canale
Agilent Technologies: Digital Modulation in Communications Systems - An Introduction - Application Note 1298
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Sistema numerico di telecomunicazione: trasmettitore
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Agilent Technologies: Digital Modulation in Communications Systems - An Introduction - Application Note 1298
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Sistema numerico di telecomunicazione: ricevitore
Agilent Technologies: Digital Modulation in Communications Systems - An Introduction - Application Note 1298
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FINE