Download Comunicaciones Móviles by Monica Gorrincho & Jose Luis Gorrincho PDF

By Monica Gorrincho & Jose Luis Gorrincho

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Extra info for Comunicaciones Móviles

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Por contra, a medida que aumente la duración de la señal, el canal tiene más tiempo para variar y en consecuencia distorsionar la señal transmitida. Por tanto, como en el caso del delay spread, la distorsión temporal es relativa al ancho de banda de la señal transmitida. © Los autores, 2002; © Edicions UPC, 2002. 31 Fundamentos de la telefonía móvil Se define un tiempo de coherencia del canal, tiempo en el cual el comportamiento del mismo es aproximadamente invariante. Para tener un orden de magnitud, se cuantifica dicho tiempo de coherencia como el inverso de la máxima frecuencia Doppler, que depende de la velocidad de desplazamiento del terminal móvil cuando éste se mueve en la misma dirección que la de propagación de la señal transmitida entre emisor y receptor.

5. Existen otros sistemas de comunicaciones como el sistema TETRA (Trans European Trunking RAdio) de trunking que realiza el duplexado en el tiempo (TDD). Por otra parte, los sistemas de segunda generación utilizan, igual que los sistemas de primera generación, la subdivisión frecuencial (FDMA) de todo el ancho de banda ascendente y descendente en canales. La diferencia entre los sistemas de primera y segunda generación estriba en que los sistemas de primera generación ocupan un canal por comunicación, mientras que los sistemas de segunda generación multiplexan en tiempo (TDMA) o en código (CDMA) varias comunicaciones sobre cada canal.

Con ello se consigue reducir la varianza de la relación señal a interferencia de la comunicación para velocidades de desplazamiento del terminal lentas. Aprovechando el multiplexado temporal de la comunicación, cada slot de tiempo se emite en una frecuencia distinta, ya que el terminal móvil tiene tiempo para sintonizar una nueva frecuencia para la emisión del siguiente slot. La utilización de dicha técnica no impone ninguna restricción adicional sobre el terminal móvil, ya que éste tiene que sintonizar igualmente otras frecuencias en los intervalos de tiempo libres entre emisión y recepción para poder localizar las celdas vecinas.

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