Synchronization and equalization in a tdma cellular system

H - Electricity – 04 – J

Patent

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Details

H04J 3/06 (2006.01) H04B 7/212 (2006.01) H04B 7/26 (2006.01) H04Q 7/22 (2006.01)

Patent

CA 2063421

In a Time Division Multiple Access (TDMA) cellular system, there is provided a mechanism for synchronization and equalization comprising: providing synchronization information (S/S) sufficiently removed from the start of a TDM slot so as to maintain the integrity of that synchronization information (S/S) at adjacent cells and providing that synchronization information (S/S) not so far removed from the start of the slot as to necessitate adaptive equalization of information preceding the synchronization information (S/S) for sufficiently reliable recovery. The equalization is further enhanced by providing, roughly mid-way between the synchronization information (S/S) and the end of the slot, additional information (CC) upon which equalization may retrain. Accordingly, equalizers perform retrospective, non-adaptive equalization of information preceding the synchronization information (S/S), perform adaptive equalization of information following that synchronization information (S/S), and retrain utilizing known bit-sequences elsewhere within the TDM slot; the additional information (CC) comprises known bit-sequences identifying cells.

ans un système cellulaire a accès multiple à répartition dans le temps (AMRT), un mécanisme de synchronisation et d'égalisation fournit une information de synchronisation (S/S) suffisamment éloignée du début d'une fenêtre de multiplexage temporel pour maintenir l'intégrité de cette information de synchronisation (S/S) aux cellules adjacentes et fournit cette information de synchronisation (S/S) à un instant qui n'est pas suffisamment éloigné du début de la fenêtre pour nécessiter une égalisation adaptative de l'information qui précède l'information de synchronisation (S/S) afin d'assurer la fiabilité de l'extraction. On améliore l'égalisation en fournissant, approximativement à mi-chemin entre l'information de synchronisation (S/S) et la fin de la fenêtre, une information additionnelle (CC) sur laquelle l'égalisation peut reprendre. Les égaliseurs effectuent donc une égalisation rétrospective et non adaptative de l'information qui précède l'information de synchronisation (S/S), une égalisation adaptative de l'information qui suit cette information de synchronisation (S/S) et reprend en utilisant des séquences de bits connues choisies ailleurs dans la fenêtre de multiplexage temporel. L'information additionnelle (CC) comprend des cellules d'identification de séquences de bits connues.

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