MULTIPOINT-TO-POINT COMMUNICATION USING ORTHOGONAL FREQUENCY DIVISION MULTIPLEXING
First Claim
1. A host unit for a bi-directional communication system, the host unit comprising:
- a modem to communicate with a plurality of remote units using a fast Fourier transform to accomplish orthogonal frequency division multiplexing, the plurality of remote units communicatively coupled to the modem in a multipoint-to-point configuration;
the modem receiving an orthogonal frequency division multiplexing waveform, the orthogonal frequency division multiplexing waveform comprising a plurality of tones transmitted by the plurality of remote units;
a control circuit, coupled to the modem, that is configured to generate adjustment information for a first remote unit of the plurality of remote units; and
wherein the control circuit provides the adjustment information to the modem for transmission to the first remote unit so that when any tones are transmitted from the first remote unit and at least one other remote unit of the plurality of remote units, the tones are substantially orthogonal when received at the modem.
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Accused Products
Abstract
A bidirectional communication system is provided. The system includes a first remote unit for communicating with a host unit using orthogonal frequency division multiplexing. The host unit is communicatively coupled to a plurality of remote units in a multipoint-to-point configuration. The first remote unit is configured to transmit up to a plurality of tones and the first remote unit includes a modulator for modulating the plurality of tones with upstream information using orthogonal frequency division multiplexing such that when any tones are transmitted from the first remote unit and at least one other remote unit of the plurality of remote units, the tones are substantially orthogonal when received at the host unit.
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Citations
17 Claims
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1. A host unit for a bi-directional communication system, the host unit comprising:
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a modem to communicate with a plurality of remote units using a fast Fourier transform to accomplish orthogonal frequency division multiplexing, the plurality of remote units communicatively coupled to the modem in a multipoint-to-point configuration;
the modem receiving an orthogonal frequency division multiplexing waveform, the orthogonal frequency division multiplexing waveform comprising a plurality of tones transmitted by the plurality of remote units;
a control circuit, coupled to the modem, that is configured to generate adjustment information for a first remote unit of the plurality of remote units; and
wherein the control circuit provides the adjustment information to the modem for transmission to the first remote unit so that when any tones are transmitted from the first remote unit and at least one other remote unit of the plurality of remote units, the tones are substantially orthogonal when received at the modem. - View Dependent Claims (2, 3, 4, 5)
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6. A remote unit for a bi-directional communication system, the remote unit comprising:
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a modem communicatively coupled with a multipoint-to-point host unit via an orthogonal frequency division multiplexing waveform in a multiple access scheme;
wherein the modem is adjusted by the multipoint-to-point host unit to modulate at least one tone of a plurality of tones in the orthogonal frequency division multiplexing waveform to be orthogonal with other tones in the orthogonal frequency division multiplexing waveform at the host unit. - View Dependent Claims (7, 8, 9, 10)
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11. A bidirectional communication system, comprising:
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a host unit having a modem;
a plurality of remote units, communicatively coupled with the host unit in a multipoint-to-point configuration;
wherein the plurality of remote units are configured to use a multiple access communication scheme to transmit using a plurality of tones in an orthogonal frequency division multiplexing (OFDM) waveform so that tones from the plurality of remote units are received at the host unit modem substantially orthogonal within an OFDM waveform. - View Dependent Claims (12, 15, 16, 17)
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- 13. The system of clam 11, wherein the host unit is communicatively coupled with the plurality of remote units over a distribution network.
Specification