Digital communication system using superposed transmission...

H - Electricity – 04 – L

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Details

H04L 1/00 (2006.01) H04B 7/216 (2006.01) H04L 5/06 (2006.01)

Patent

CA 2083776

A digital communication system using superposed transmission of high and low speed digital signals capable of transmitting superposed high and low speed digital signals through an identical frequency band efficiently by increasing a simultaneously transmittable number of channels in the low speed digital signals, while achieving the practically reasonable bit error rate performances for both the high speed digital signals and the low speed digital signals. In this system, the low speed digital signals are transmitted in a form of spread spectrum signals and the high speed digital signals are cancelled out from the superposed transmission signals in obtaining the output low speed digital signals by using the phase inverted replica of the high speed digital signals to be combined with the superposed transmission signals, so that it becomes possible to increase a number of channels for the low speed digital signals, while achieving the practically reasonable bit error rate performances for both the high speed digital signals and the low speed digital signals.

L'invention est un système de communication numérique capable de transmettre simultanément de façon efficace des signaux dans une même bande de fréquences en augmentant le nombre des canaux de transmission à faible débit tout en maintenant le taux d'erreur sur les bits à un niveau acceptable pour les signaux à grand débit et les signaux à faible débit. Dans ce système, les signaux numériques à faible débit sont transmis par étalement du spectre, alors que les signaux numériques à grand débit sont éliminés des signaux transmis superposés dans l'extraction des signaux à faible débit à l'aide d'une copie inversée en phase des signaux à grand débit que l'on combine avec les signaux transmis superposés, afin d'accroître le nombre de canaux pour les signaux à faible débit tout en maintenant le taux d'erreur sur les bits à un niveau acceptable pour les signaux à grand débit et les signaux à faible débit.

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