Reducing crosstalk between communications systems

Details Reducing crosstalk between communications systems Reducing crosstalk between communications systems

H - Electricity

04

M

H04M 1/74 (2006.01) H04B 3/32 (2006.01) H04B 15/02 (2006.01)

Patent

CA 2256898

Modems (12, 14) using a telephone line (10) for high speed communications between them are arranged to monitor crosstalk (24, 26) from other existing communications systems (16, 18, 20, 22) with which they may mutually interfere, and adjust the power spectral densities (PSDs) of their transmitted signals to reduce overlap between the PSDs of the different systems, thereby reducing near end crosstalk. Communications can thereby be optimized for whatever crosstalk conditions may exist. The modems can have a master-slave relationship for communicating buffered frames in a half-duplex manner using a collision avoidance protocol for computer network access. Analysis of monitored crosstalk PSD information can be performed by each modem, by the master modem, or by a separate computer on the network. A digital signal processor used in each modem for receiving signals can be configured to be used at other times for the monitoring of crosstalk.

Des modems (12, 14), mettant en oeuvre une ligne téléphonique (10) destinée à des communications grande vitesse entre eux, sont conçus pour contrôler la diaphonie (24, 26) provenant d'autres systèmes de communications existants (16, 18, 20, 22) et pouvant provoquer des interférences mutuelles, et pour régler les densités spectrales d'énergie de leurs signaux transmis afin de réduire le chevauchement entre les densités spectrales des différents systèmes, ce qui permet d'atténuer la paradiaphonie. Il est ainsi possible d'optimiser des communications, quelles que soient les conditions existantes de diaphonie. Les modems peuvent avoir une relation maître-esclave, aux fins de communications de trames tamponnées en mode semi-duplex, au moyen d'un protocole anticollision destiné à un accès à un réseau informatique. Chaque modem, ou chaque modem maître, ou un ordinateur séparé du réseau, peut effectuer l'analyse des informations des densités spectrales d'énergie de la diaphonie contrôlée. Un processeur de signaux numériques, mis en oeuvre dans chaque modem pour recevoir des signaux, peut être configuré pour être utilisé à d'autres moments afin de contrôler la diaphonie.

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