Synchronous multipoint-to-point cdma communication system

Details Synchronous multipoint-to-point cdma communication system Synchronous multipoint-to-point cdma communication system

H - Electricity

04

J

H04J 3/06 (2006.01) H04J 14/00 (2006.01) H04B 1/69 (2006.01) H04B 1/707 (2006.01) H04J 13/02 (2006.01) H04J 13/00 (2006.01)

Patent

CA 2197757

A multipoint-to-point CDMA communication system comprises a plurality of CDMA transmitting stations (TS1, TS2, TS3) and a single CDMA receiving station (RS), all of which are intercoupled to each other over one CDMA channel (FB1) and one feedback channel (FB2). On the one CDMA channel, the plurality of CDMA transmitting stations simultaneously send respective CDMA signals (21, 22, 23 of fig. 2) to the receiving station. In the receiving station, respective time differences are measured between a reference clock signal (RCK) and the spreading codes in the CDMA signals from each of the CDMA transmitting stations; and these time differences are indicated in respective error signals (ER1, ER2 in 27 of fig. 2) which the CDMA receiving station sends on the feedback channel to each of the CDMA transmitting stations. Each CDMA station responds to its error signals by time shifting its spreading code such that it arrives in the receiving station in synchronization (24, 25, 26 of fig. 2) with the reference clock signal. This synchronization enables interference between the spreading codes at the receiving station to be reduced by using codes which have minimal cross-correlation when their time difference is zero; and consequently, the maximum number of stations that can simultaneously transmit is increased.

Système de communication AMDC de plusieurs à un comprenant une série de stations émettrices AMDC (TS1, TS2, TS3) et une seule station réceptrice AMDC (RS), toutes étant interconnectées les unes aux autres sur un seul canal AMDC (FB1) et un seul canal de retour (FB2). Sur le canal unique AMDC, les multiples stations émettrices AMDC envoient simultanément leurs signaux AMDC respectifs (21, 22, 23 de la figure 2) à la station réceptrice. A la station réceptrice, les écarts de temps respectifs sont mesurés entre un signal d'horloge de référence (RCK) et les codes d'étalement des signaux AMDC de chacune des stations émettrices AMDC; après quoi ces écarts de temps sont indiqués dans des signaux d'erreur correspondants, (ER1, ER2 dans 27 de la figure 2) que la station réceptrice AMDC envoie sur le canal de retour à chacune des stations émettrices AMDC. Chacune des stations AMDC répond à ces signaux d'erreur par un décalage de temps de son code d'étalement de sorte que ce code parvient à la station réceptrice en synchronisation (24, 25, 26 de la figure 2) avec le signal d'horloge de référence. Cette synchronisation permet de réduire l'interférence entre les codes d'étalement à la station réceptrice en utilisant les codes présentant la corrélation transverse la plus faible lorsque leur écart de temps est nul. En conséquence, le nombre maximum de stations pouvant émettre simultanément se trouve accru.

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