Bit detection threshold in a tdma burst communication system

Details Bit detection threshold in a tdma burst communication system Bit detection threshold in a tdma burst communication system

H - Electricity

04

L

H04L 25/06 (2006.01)

Patent

CA 2414517

A method is disclosed for optimally adjusting the received bit detection threshold in a digital communication system, such as a TDMA system that is characterized by very short duration burst transmissions. In one embodiment of the invention, a half-duplex radio modem is used for transmission and receipt of messages for airborne and ground-based Automatic Dependent Surveillance- Broadcast (ADS-B) service. A feedback path is provided for in the transmission/receiver unit to provide the transmission signal to the receiver path. A bit detection threshold adjustment circuit receives the transmission signal. The circuit digitizes the analog baseband signal, detects the positive and negative peak values and calculates a peak-to-peak deviation value to define the bit detection threshold value.

L'invention concerne un procédé permettant d'ajuster de manière optimale le seuil de détection de bit reçu dans un système de communication numérique, comme un système TDMA qui est caractérisé par des transmissions en rafales de très courtes durées. Selon l'un des modes de réalisation, un modem semi-duplex radio sert à transmettre et recevoir des messages pour un service d'émission-surveillance dépendant automatique (ADS-B) aériens et terrestres. Un parcours de réaction d'une unité de réception/transmission sert à envoyer un signal de transmission au parcours de réception. Un circuit d'ajustement de seuil de détection reçoit le signal de transmission. Ensuite, le circuit numérise le signal de bande de base analogique, détecte les valeurs de pic positives et négatives et calcule une valeur de déviation pic-à-pic, en vue de définir la valeur de seuil de détection de bit.

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