Apoyo al estudio de temas avanzados de comunicaciones by Eva María Arias de Reyna Domínguez

By Eva María Arias de Reyna Domínguez

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E V N 1'061 0 Comparando con el caso IH~(w)l = 1 p~ = Q R' < b /2E' :::::? 1 _ b V No > 25'4 · 10- 15 J Vw/lwl :; Wc: r--g) (V~ob ~-- 10- 6 b 1- > 4'75:::::? E' > 25' 4 . dB = 10 log(l'061 2 ) :::: . 7 Ejemplo Referencias • Proakis, J. ; Salehi, M. Digital Communications, McGraw-Hill, 2008. • Payán, F. ; Acha, B. Apuntes de la asignatura "Sistemas de Transmisión", 2009. Lección l. Transmisión de señales a través de canales limitados en banda. señales a través de canales limitados-en banda 90 /90 50 Tema 2 ,.

4800 lwl < 27r4800 • Diseñar un sistema con ISI nula. 41· para Pp < 10-ti Transmisión de señales a través. 7 Ejemplo Ejemplo: aptdo. 1 D Br = 2(1 Prc(w) + et) 4800 -2 =4800Hz= Be::::::? Br::; Be 2 = - =u [ 1+ COS [1 ' cos (Tiwl)l 2 J T 2 (T~wl) l lwl::; 2Wo lwl 2': _ lwl )] 1 +cos ( 9600 -1 T 1 2Wo 2 ( 4800 cos lw 1 ) 2. 9600 1 = 2 (. 7 Ejemplo Ejemplo: aptdo. 4800 f¡pre(w)l IHR(w)i =kV IHe(w)l - ( O1 + 'r ··-···- .. -----··-· 1 { iwl ) .. )2) ~ cos (19200 ( 2rr4soo lwl :S 2r:4800 e. o. c. ¡ "[ :;¡ "f ..

L\1} ' lwl > vVc Coseno Alzado Respuesta parcial Procedimiento w(t) 8 Relación entre EA\·· de la señal transmitida, A y jGy(w)j 8 Potencia de ruido(]"~ en función de IHR(w)j O Calcularemos Pe y veremos que P~ = cte · Q ( 2 ~v) • 151 nula • Codificación correlativa: Duobinaria o duobinaria modificada e Maximizar ;~. para minimizar Pe IHR(~·)I . -t Relación entre IGr(w)l y 0 Determinar jGy(w)j y IHR(w)j CD Sustituir los valores de ;~ en Pe (151 nula y cod. 'y(mT) IDeecor D~s de t t 1 5 Ida w(t) • ai = 4(2i- A1- 1), i E {1, 2, · · · , 1\II} 4, - ( 4,··· , 4} • an E {- (A!

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