Telecommunications – Transmitter and receiver at separate stations – Frequency or phase modulation
Patent
1996-12-31
1998-07-21
Eisenzopf, Reinhard J.
Telecommunications
Transmitter and receiver at separate stations
Frequency or phase modulation
455106, 455283, 329304, 342 44, 342 51, 34087007, 34087018, H03C 152
Patent
active
057846863
ABSTRACT:
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 backscattered 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 I and Q outputs are combined using an IQ combiner. This IQ combiner introduces a 90.degree. 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.
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Shober R. Anthony
Wu You-Sun
Aoki Makoto
Eisenzopf Reinhard J.
Lucent Technologies - Inc.
Narcisse Claude R.
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