SYSTEMS AND METHOD FOR ORTHOGONAL FREQUENCY DIVISIONAL MULTIPLEXING
First Claim
1. A multi-carrier communication system, the system comprising:
- a first remote unit comprising;
a first receiver configured to de-modulate symbols from at least one of a plurality of spectrally overlapping carrier signals to produce a receiver output;
a first transmitter configured to modulate symbols onto at least one of a plurality of the spectrally overlapping carrier signals;
a first processor coupled to the first transmitter, wherein the first processor outputs data for transmission by the first transmitter, wherein the first processor applies an inverse Fourier transform algorithm to the data transmitted by the first transmitter;
the first processor coupled to the first receiver, wherein the first processor applies a Fourier transform algorithm to the receiver output of the first receiver; and
a first controller programmed to instruct the first transmitter to transmit at least one symbol representing a request for bandwidth allocation on a first carrier of the plurality of spectrally overlapping carrier signals;
a second remote unit comprising;
a second receiver configured to de-modulate symbols from at least one of a plurality of spectrally overlapping carrier signals to produce a receiver output;
a second transmitter configured to modulate symbols onto at least one of a plurality of the spectrally overlapping carrier signals;
a second processor coupled to the second transmitter, wherein the second processor outputs data for transmission by the second transmitter, wherein the second processor applies an inverse Fourier transform algorithm to the data transmitted by the second transmitter;
the second processor coupled to the second receiver, wherein the second processor applies a Fourier transform algorithm to the receiver output of the second receiver; and
a second controller programmed to instruct the second transmitter to transmit at least one symbol representing a request for bandwidth allocation on the first carrier of the plurality of spectrally overlapping carrier signals;
wherein the second controller is further programmed to determine when a collision has occurred on the first carrier of the plurality of spectrally overlapping carrier signals between transmissions from the first remote unit and transmission from the second remote unit.
3 Assignments
0 Petitions
Accused Products
Abstract
Systems and methods for orthogonal frequency division multiplexing are provided. In one embodiment, a multi-carrier modem comprises: a receiver configured to de-modulate symbols from at least one of a plurality of spectrally overlapping carrier signals to produce a receiver 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 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; the processor coupled to the receiver, wherein the processor applies a Fourier transform to the receiver output; and a controller programmed to instruct the transmitter to transmit at least one symbol representing a request for bandwidth allocation on a first carrier; wherein the controller is further programmed to determine when a collision has occurred on the first carrier.
150 Citations
8 Claims
-
1. A multi-carrier communication system, the system comprising:
-
a first remote unit comprising; a first receiver configured to de-modulate symbols from at least one of a plurality of spectrally overlapping carrier signals to produce a receiver output; a first transmitter configured to modulate symbols onto at least one of a plurality of the spectrally overlapping carrier signals; a first processor coupled to the first transmitter, wherein the first processor outputs data for transmission by the first transmitter, wherein the first processor applies an inverse Fourier transform algorithm to the data transmitted by the first transmitter; the first processor coupled to the first receiver, wherein the first processor applies a Fourier transform algorithm to the receiver output of the first receiver; and a first controller programmed to instruct the first transmitter to transmit at least one symbol representing a request for bandwidth allocation on a first carrier of the plurality of spectrally overlapping carrier signals; a second remote unit comprising; a second receiver configured to de-modulate symbols from at least one of a plurality of spectrally overlapping carrier signals to produce a receiver output; a second transmitter configured to modulate symbols onto at least one of a plurality of the spectrally overlapping carrier signals; a second processor coupled to the second transmitter, wherein the second processor outputs data for transmission by the second transmitter, wherein the second processor applies an inverse Fourier transform algorithm to the data transmitted by the second transmitter; the second processor coupled to the second receiver, wherein the second processor applies a Fourier transform algorithm to the receiver output of the second receiver; and a second controller programmed to instruct the second transmitter to transmit at least one symbol representing a request for bandwidth allocation on the first carrier of the plurality of spectrally overlapping carrier signals; wherein the second controller is further programmed to determine when a collision has occurred on the first carrier of the plurality of spectrally overlapping carrier signals between transmissions from the first remote unit and transmission from the second remote unit. - View Dependent Claims (2, 3)
-
-
4. A multi-carrier modem, the modem comprising:
-
a receiver configured to de-modulate symbols from at least one of a plurality of spectrally overlapping carrier signals to produce a receiver 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 transmitter, wherein the processor outputs data for transmission by the transmitter, wherein the processor applies an inverse Fourier transform algorithm to the data transmitted by the transmitter; the processor further coupled to the receiver, wherein the processor applies a Fourier transform algorithm to the receiver output of the receiver; and a controller programmed to instruct the transmitter to transmit at least one symbol representing a request for bandwidth allocation on a first carrier of the plurality of spectrally overlapping carrier signals; wherein the controller is further programmed to determine when a collision has occurred on the first carrier of the plurality of spectrally overlapping carrier signals between transmissions transmitted from the transmitter and any other transmissions. - View Dependent Claims (5, 6, 7, 8)
-
Specification