Subtractive multicarrier cdma access methods and systems

H - Electricity – 04 – B

Patent

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H04B 7/204 (2006.01) H04B 7/26 (2006.01) H04J 4/00 (2006.01) H04L 5/02 (2006.01) H04Q 3/22 (2006.01) H04B 1/707 (2006.01) H04J 13/02 (2006.01) H04J 13/00 (2006.01)

Patent

CA 2247617

Apparatuses and methods for practising subtractive multi-carrier CDMA techniques are disclosed. A channel is divided into a plurality of contiguous subchannels, wherein in each subchannel an amount of spreading is reduced in accordance with the number of subchannels. The channel can be divided into a plurality of time slots and a fraction of the total number of conversations sharing the channel can be allocated to each time slot. A radio communications device, using such a method, can employ one time slot for transmission and another time slot for reception.

On décrit des appareils ainsi que des procédés destinés à mettre en oeuvre des techniques d'accès multiple par différence de code (CDMA), au moyen de porteuses multiples et soustractives. On a divisé une voie en plusieurs sous-voies contiguës, l'étalement du spectre étant réduit dans chaque sous-voie en fonction du nombre de sous-voies. On peut diviser la voie en une pluralité de tranches de temps et on peut allouer à chaque tranche de temps une fraction du nombre total des conversations se partageant cette voie. Dans un dispositif de communications radio mettant en oeuvre un tel procédé, on peut utiliser une tranche de temps pour l'émission et une autre tranche de temps pour la réception.

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