SYMBOL ALIGNMENT IN MULTIPOINT-TO-POINT ORTHOGONAL FREQUENCY DIVISION MULTIPLEXING COMMUNICATION
First Claim
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1. A method comprising:
- sharing upstream bandwidth capacity among a plurality of remote units in a manner that permits at least two of the remote units to transmit to a host at any one time using the upstream bandwidth capacity, the upstream bandwidth capacity comprising a plurality of orthogonal tones generated using inverse fast Fourier transforms; and
causing at least one remote unit to adjust the manner in which symbols are transmitted therefrom on at least one of the plurality of orthogonal tones in order to improve the alignment of symbols received at the host.
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Abstract
A method is provided. The method includes sharing upstream bandwidth capacity among a plurality of remote units in a manner that permits at least two of the remote units to transmit to a host at any one time using the upstream bandwidth capacity, the upstream bandwidth capacity comprising a plurality of orthogonal tones generated using inverse fast Fourier transforms, and causing at least one remote unit to adjust the manner in which symbols are transmitted therefrom on at least one of the plurality of orthogonal tones in order to improve the alignment of symbols received at the host.
129 Citations
12 Claims
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1. A method comprising:
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sharing upstream bandwidth capacity among a plurality of remote units in a manner that permits at least two of the remote units to transmit to a host at any one time using the upstream bandwidth capacity, the upstream bandwidth capacity comprising a plurality of orthogonal tones generated using inverse fast Fourier transforms; and
causing at least one remote unit to adjust the manner in which symbols are transmitted therefrom on at least one of the plurality of orthogonal tones in order to improve the alignment of symbols received at the host. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method comprising:
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receiving at a host a plurality of upstream symbols transmitted from a plurality of remote units on a plurality of orthogonal tones using orthogonal frequency division multiplexing;
determining a symbol timing error for at least one remote unit; and
causing the at least one remote unit to adjust the manner in which symbols are transmitted therefrom based on the symbol timing error. - View Dependent Claims (10)
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11. A method for a remote unit of a multi-point to point communication system, the method comprising:
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modulating one or more tones of an orthogonal frequency division multiplexing waveform with the upstream information based on an inverse Fourier transform algorithm;
transmitting the one or more tones to a multi-point-to-point host unit;
receiving a symbol timing adjustment from the multi-point-to-point host unit; and
delaying transmission of symbols on the one or more tones based on the symbol timing adjustment. - View Dependent Claims (12)
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Specification