Dual-mode fm/cdma communication system

H - Electricity – 04 – L

Patent

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Details

H04L 27/32 (2006.01) H04B 1/04 (2006.01) H04B 1/18 (2006.01) H04B 1/40 (2006.01) H04L 25/49 (2006.01) H04L 27/14 (2006.01) H04L 27/233 (2006.01) H04J 13/00 (2006.01) H04Q 7/32 (2006.01)

Patent

CA 2208081

A dual-mode digital communication system for communicating an information signal during operation in frequency-modulated (FM) and multiple-access modes is disclosed herein. The digital communication system includes a dual-mode transmitter (14) for transmitting the information signal using an FM communication signal during FM mode operation, and for transmitting the information signal using a multiple-access communication signal during multiple-access mode operation. The communication system further includes a dual-mode receiver (16) for receiving the FM communication signal during FM mode operation, and for receiving the multiple-access communication signal during multiple-access mode operation. Incorporated within the dual- mode receiver (16) is a digital demodulator (96) for recovering the information signal from the received FM signal during operation in the FM mode, and for recovering the information signal from the received multiple-access signal during multiple-access mode operation.

La présente invention décrit un système de communication numérique en mode double permettant de communiquer un signal d'information lorsque les modes modulation de fréquence (FM) et accès multiple sont utilisés. Le système de communication numérique comprend un émetteur en mode double (14) qui permet d'émettre le signal d'information soit à l'aide d'un signal de communication FM lorsque le mode FM est utilisé, soit à l'aide d'un signal de communication à accès multiple, lorsque le mode à accès multiple est utilisé. De plus, le système de communication comprend un récepteur en mode double (16) qui assure la réception du signal de communication FM pendant l'utilisation du mode FM et la réception du signal de communication à accès multiple pendant l'utilisation du mode à accès multiple pendant l'utilisation du mode à accès multiple. Le récepteur en mode double (16) comprend également un démodulateur numérique (96) qui récupère soit le signal d'information provenant du signal FM reçu pendant l'utilisation en mode FM, soit le signal d'information provenant du signal à accès multiple pendant l'utilisation en mode à accès multiple.

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