Surface wave devices for differential coherent detectors

H - Electricity – 04 – L

Patent

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Details

H04L 27/227 (2006.01) H03H 9/64 (2006.01) H03H 9/72 (2006.01) H03M 7/00 (2006.01) H03M 7/36 (2006.01) H04B 1/38 (2006.01) H04B 1/707 (2006.01)

Patent

CA 2198529

A surface wave device, for use in differential coherent detection in a commutation signaling communications system using N predetermined M-bit codewords, propagates surface waves for each codeword to a first coded output IDT (inter-digital transducer) comprising M parallel taps with a pitch t = T / M, the taps having phases representing bits of the respective codeword, and to a second output IDT which is at a distance from an input IDT greater by T than the first coded output IDT, to provide an additional delay of one information symbol. The input IDT, or each tap of each coded output IDT, has a length equal to t. The second output IDT can comprise a coded IDT, or a delay tap responsive to the surface wave propagated via the first coded output IDT.

L'invention est un générateur d'ondes de surface utilisé pour la détection cohérente différentielle dans un système de communication à commutation utilisant N mots de code de M bits. Pour chaque mot de code, le générateur transmet des ondes de surface à un premier IDT (transducteur interdigité) de sortie codé comportant M prises parallèles espacées l'une de l'autre d'une distance t = T/M et ayant des phases représentant les bits du mot de code correspondant, ainsi qu'à un second IDT de sortie espacé d'un IDT d'entrée d'une distance plus grande de T que le premier IDT de sortie codé, pour produire un retard additionnel correspondant à la durée d'un symbole d'information. L'IDT d'entrée, ou chaque prise de chaque IDT de sortie codé, a une longueur égale à t. Le second IDT de sortie peut comprendre un IDT codé, ou une prise à retardement asservie à l'onde de surface transmise via le premier IDT de sortie codé.

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