Methods and apparatus for single sideband modulation...

Details Methods and apparatus for single sideband modulation... Methods and apparatus for single sideband modulation...

2011-03-08

2011-03-08

Pan, Yuwen (Department: 2618)

Telecommunications

Transmitter and receiver at same station

With transmitter-receiver switching or interaction prevention

C455S084000, C340S010100

Reexamination Certificate

active

07904032

ABSTRACT:
Systems and techniques for RFID communication using a frequency shift between uplink and downlink carrier frequencies achieved by digital processing of a baseband signal before radio frequency modulation of a carrier signal occurs. Generation of the carrier signal, and modulation of the carrier signal, is accomplished using digital techniques. A digital representation of a baseband signal is modulated to create a complex baseband signal multiplied by a negative frequency shift equal to a difference between downlink and uplink carrier frequencies. This signal undergoes analog to digital conversion and modulation by a carrier signal at an uplink frequency. The complex baseband signal includes in-phase and quadrature components. During uplink communication, the in-phase component of the complex baseband signal is replaced by a constant value. The quadrature component is replaced by a zero signal. During uplink communication, therefore, an umodulated carrier signal at an uplink frequency is generated.

REFERENCES:
patent: 5751820 (1998-05-01), Taenzer
patent: 5940006 (1999-08-01), MacLellan et al.
patent: 6084530 (2000-07-01), Pidwerbetsky et al.
patent: 7035322 (2006-04-01), Girard
patent: 2007/0188305 (2007-08-01), Drucker

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