Iq combiner technology in modulated backscatter system

Details Iq combiner technology in modulated backscatter system Iq combiner technology in modulated backscatter system

H - Electricity

04

L

H04L 27/22 (2006.01) H03D 1/22 (2006.01) H03D 3/00 (2006.01) H04B 7/22 (2006.01)

Patent

CA 2221905

In accordance with the present invention, an RFID system has a homodyne receiver having two outputs; the in-phase or I output and the quadrature or Q output. The modulated baskscattered signal is composed of an information signal, modulated onto a single frequency subcarrier signal, generating a modulated subcarrier signal; this modulated subcarrier signal is then backscatter modulated onto the incoming RF signal. To demodulate this modulated backscattered signal, the Iand Q outputs are combined using an IQ combiner. This IQ combiner introduces a 90° phase shift, with respect to the frequency of the subcarrier signal, onto one of the demodulator outputs and then combines the outputs of the demodulator.

La présente invention est un système d'identification radiofréquence comportant un récepteur homodyne à deux sorties, une sortie en phase I et une sortie en quadrature Q. Le signal rétrodiffusé modulé est constitué d'un signal d'information modulé sur une sous-porteuse monofréquence; cette sous-porteuse modulée est ensuite modulée sur le signal RF incident. Pour démoduler ce signal rétrodiffusé modulé, les signaux de sortie I et Q sont combinés dans un combinateur qui introduit dans l'un les signaux de sortie du démodulateur un déphasage de 90o par rapport à la sous-porteuse avant de combiner les signaux de sortie du démodulateur.

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