SYSTEMS AND METHOD FOR ORTHOGONAL FREQUENCY DIVISIONAL MULTIPLEXING
First Claim
1. A multi-carrier modem, the modem comprising:
- a receiver configured to receive symbols from at least one of a plurality of spectrally overlapping carrier signals to produce an output;
a transmitter configured to modulate symbols onto at least one of a plurality of the spectrally overlapping carrier signals;
a processor coupled to the receiver, wherein the processor applies a Fourier transform to the output from the receiver; and
a controller programmed to instruct the transmitter to transmit at least one symbol comprising a ranging pattern when a predetermined instruction is received by the receiver.
4 Assignments
0 Petitions
Accused Products
Abstract
Systems and methods for orthogonal frequency division multiplexing are provided. In one embodiment, a multi-carrier modem comprising: a receiver configured to receive symbols from at least one of a plurality of spectrally overlapping carrier signals to produce an output; a transmitter configured to modulate symbols onto at least one of a plurality of the spectrally overlapping carrier signals; a processor coupled to the receiver, wherein the processor applies a Fourier transform to the output from the receiver; and a controller programmed to instruct the transmitter to transmit at least one symbol comprising a ranging pattern when a predetermined instruction is received by the receiver.
142 Citations
8 Claims
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1. A multi-carrier modem, the modem comprising:
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a receiver configured to receive symbols from at least one of a plurality of spectrally overlapping carrier signals to produce an output;
a transmitter configured to modulate symbols onto at least one of a plurality of the spectrally overlapping carrier signals;
a processor coupled to the receiver, wherein the processor applies a Fourier transform to the output from the receiver; and
a controller programmed to instruct the transmitter to transmit at least one symbol comprising a ranging pattern when a predetermined instruction is received by the receiver. - View Dependent Claims (2, 3, 4)
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5. A multi-carrier modem, the modem comprising:
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a receiver configured to de-modulate symbols from at least one of a plurality of spectrally overlapping carrier signals;
a transmitter configured to modulate symbols onto at least one of a plurality of the spectrally overlapping carrier signals;
a processor coupled to the transmitter, wherein the processor outputs data for transmission by the transmitter, wherein the processor applies an inverse Fourier transform to the data transmitted by the transmitter;
a controller programmed to compare a phase of a ranging tone received from at least one of a plurality of remote units with a synchronizing tone transmitted to the plurality of remote units. - View Dependent Claims (6, 7, 8)
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Specification