Qpsk modulated backscatter system

H - Electricity – 04 – B

Patent

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Details

H04B 7/22 (2006.01) G06K 7/00 (2006.01) H04B 14/08 (2006.01) H04L 27/18 (2006.01) H04L 27/20 (2006.01) H04L 27/233 (2006.01)

Patent

CA 2219266

In accordance with the present invention, a duplex radio communication system comprises an Interrogator which generates a radio signal to at least one remote Tag. The remote Tag receives the radio signal. The Tag then generates a subcarrier signal, and using Quadrature Phase Shift Keying (QPSK), modulates an information signal onto the subcarrier. A Backscatter Modulator, using this modulated subcarrier, modulates the reflection of the radio signal, the reflected signal being a reflected modulated signal. The Interrogator receives and demodulates the reflected modulated signal to obtain the information signal. In one embodiment, demodulation utilizes a homodyne detector. In another embodiment, the Interrogator modulates an information signal onto the radio signal, transmits that modulated radio signal to the Tag, and the Tag demodulates that modulated radio signal to recover the information signal. In another embodiment, higher order phase modulations are used to modulate an information signal onto the subcarrier.

La présente invention est un système de radiocommunication duplex comportant un interrogateur qui transmet un signal radio à une étiquette éloignée au moins. Quand elle reçoit ce signal, celle-ci produit une sous-porteuse qu'elle module par déplacement de phase en quadrature au moyen d'un signal d'information. En utilisant cette sous-porteuse modulée, un modulateur module le signal radio réfléchi. L'interrogateur reçoit ce signal réfléchi modulé et le démodule pour obtenir le signal d'information. Dans l'une des concrétisations de l'invention, la démodulation se fait au moyen d'un détecteur homodyne. Dans une autre concrétisation, l'interrogateur module un signal d'information sur le signal radio, transmet ce signal radio modulé à l'étiquette et celle-ci démodule ce signal pour recouvrer le signal d'information. Encore dans une autre concrétisation, le signal d'information est incorporé à la sous-porteuse par des modulations de phase d'ordre plus élevé.

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