Multiplex communications – Duplex – Transmit/receive interaction control
Reexamination Certificate
2008-04-22
2008-04-22
Sam, Phirin (Department: 2619)
Multiplex communications
Duplex
Transmit/receive interaction control
C375S152000, C379S406010
Reexamination Certificate
active
10219906
ABSTRACT:
A method and apparatus are disclosed for canceling cross-talk in a frequency-division multiplexed communication system. The disclosed frequency-division multiplexed communication system employs multiple carriers having overlapping channels and provides an improved cross-talk cancellation mechanism to address the resulting interference. Bandwidth compression is achieved using n level amplitude modulation in each frequency band. An FDM receiver is also disclosed that decomposes the received broadband signal into each of its respective frequency bands and returns the signal to baseband in the analog domain. Analog requirements are relaxed by removing cross-talk from adjacent RF channels, from image bands, and minimizing the performance degradation caused by In-phase and Quadrature-phase (I/Q) phase and gain mismatches in modulators and demodulators. The disclosed transmitter or receiver (or both) can be fabricated on a single integrated circuit.
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