Radio interface for a cordless small system using the 2.4...

Details Radio interface for a cordless small system using the 2.4... Radio interface for a cordless small system using the 2.4...

H - Electricity

04

B

H04B 7/204 (2006.01) H04B 7/26 (2006.01) H04L 27/18 (2006.01) H04Q 11/00 (2006.01) H04Q 7/36 (2006.01)

Patent

CA 2294535

The present invention relates to a radio interface for a cordless small system using the 2.4 GHz ISM band. According to the present invention, a transmission system having a fixed station (1) and at least one mobile station (2, 3) is provided for this purpose, the fixed station (1) and the mobile station (2) each having devices (RF modules 4, 5) in order to transmit the data in time slots using a frequency-division multiplex method (FDMA) and a time-division multiplex method (TDMA), and with time division duplexing (TDD). As is known from DECT Standard, the data are modulated onto a carrier frequency (f x) using a GMSK modulation method. The RF modules (4, 5) in the fixed station (1) and, respectively, the mobile station (2) are in this case designed such that the carrier frequency (f x) is changed after a predetermined time period, which may correspond, for example, to the time duration of a time slot or of a transmission frame. A transmission frame in this case contains 16 time slots.

L'invention concerne une interface radio pour une petite installation sans fil dans la bande ISM 2,4 GHz. Selon l'invention, il est prévu à cet effet un système de transmission comportant une station fixe (1) et au moins une station mobile (2, 3), la station fixe (1) et la station mobile (2, 3) présentant chacune des unités (modules HF 4, 5) pour transmettre les données dans des créneaux temporels selon un procédé de multiplexage fréquenciel (AMRF), de multiplexage temporel (AMRT) et de duplex à répartition dans le temps (DRT). Les données sont modulées à une fréquence porteuse (fx), de façon connue dans la norme DECT, selon un procédé de modulation GMSK. Les modules HF (4, 5) dans la station fixe (1) ou dans la station mobile (2, 3) sont conçus de sorte que la fréquence porteuse (fx) soit changée, après un durée prédéterminée qui peut correspondre par exemple à la durée d'un créneau temporel ou d'une trame de transmission. Une trame comprend 16 créneaux temporels.

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