Multiplex communications – Generalized orthogonal or special mathematical techniques – Quadrature carriers
Reexamination Certificate
2011-08-09
2011-08-09
Jain, Raj K (Department: 2472)
Multiplex communications
Generalized orthogonal or special mathematical techniques
Quadrature carriers
Reexamination Certificate
active
07995454
ABSTRACT:
Systems and methods for orthogonal frequency division multiplexing are provided. In one embodiment, a multi-carrier modem comprises: a receiver configured to receive a waveform comprising spectrally overlapping carrier signals from at least two of a plurality of remotes, wherein the spectrally overlapping carrier signals are modulated using an inverse Fourier transform algorithm; a transmitter; a processor coupled to the transmitter, wherein the processor outputs data for transmission by the transmitter, wherein the processor applies an inverse Fourier transform algorithm to the data provided to the transmitter; a controller programmed to calculate an elapsed time for each of the two remotes, the elapsed time representing a time between transmitting a ranging signal to a remote and receiving a signal from the remote in response to the ranging signal; the controller further programmed to reducing any difference between at least two elapsed times by instructing at least one of the plurality of remotes to adjust a delay.
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Anderson Brian D.
Brede Jeffrey
Ferris Tammy
Fort Michael J.
Geile Michael J.
Goodwin & Procter LLP
HTC Corporation
Jain Raj K
LandOfFree
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