Orthogonal Frequency Division Multiplexing for Wireless Communications

Ye Geoffrey Li (u. a.)

ISBN 10: 1441939709 / ISBN 13: 9781441939708

Edité par Springer, 2010

Orthogonal Frequency Division Multiplexing for Wireless Communications | Ye Geoffrey Li (u. a.) | Taschenbuch | xii | Englisch | 2010 | Springer | EAN 9781441939708 | Verantwortliche Person für die EU: Springer Verlag GmbH, Tiergartenstr. 17, 69121 Heidelberg, juergen[dot]hartmann[at]springer[dot]com | Anbieter: preigu. N° de réf. du vendeur 107207863

Synopsis :

Frequency division multiplexing (FDM) is a technology that transmits multiple signals simultaneously over a single transmission path, such as a cable or wireless system. Each signal travels within its own unique frequency range (carrier), which is modulated by the data (text, voice, video, etc.).

Orthogonal FDM's (OFDM) spread spectrum technique distributes the data over a large number of carriers that are spaced apart at precise frequencies. This spacing provides the "orthogonality" in this technique which prevents the demodulators from seeing frequencies other than their own. The benefits of OFDM are high spectral efficiency, resiliency to RF interference, and lower multi-path distortion. This is useful because in a typical terrestrial broadcasting scenario there are multipath-channels (i.e. the transmitted signal arrives at the receiver using various paths of different length). Since multiple versions of the signal interfere with each other (inter symbol interference (ISI)) it becomes very hard to extract the original information.

OFDM is sometimes called multi-carrier or discrete multi-tone modulation. It is the modulation technique used for digital TV in Europe, Japan and Australia.

Détails bibliographiques

Titre : Orthogonal Frequency Division Multiplexing ...
Éditeur : Springer
Date d'édition : 2010
Reliure : Taschenbuch
Etat : Neu