COARSE AND FINE SYNCHRONIZATION ADJUSTMENTS
First Claim
1. A method for a remote unit of an orthogonal frequency division multiplexing multipoint-to-point communications system, the method comprising:
- establishing communication between a first remote unit of a plurality of remote units and a host unit, the plurality of remote units communicatively coupled to the host unit in a multipoint-to-point configuration;
transmitting up to a plurality of tones from the first remote unit, the up to a plurality of tones modulated with upstream information using orthogonal frequency division multiplexing;
making a first adjustment in a manner in which transmissions are transmitted from the first remote unit on at least one of the up to a plurality of tones, the first adjustment varying the alignment of the transmissions as received at the host unit; and
making a second adjustment in the manner in which transmissions are transmitted from the first remote unit on the at least one of the up to a plurality of tones, the second adjustment varying the alignment of the transmissions as received at the host unit, wherein the second adjustment is a finer adjustment than the first adjustment.
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Accused Products
Abstract
Systems and methods for course and fine synchronization are provided. In one embodiment, a method comprises establishing communication between a first remote of a plurality of remote units and a host, the plurality of remote units coupled to the host in a multipoint-to-point configuration; transmitting up to a plurality of tones from the first remote, the tones modulated with upstream information using orthogonal frequency division multiplexing (OFDM); making a first adjustment in a manner in which transmissions are transmitted from the first remote on at least one of the tones, the first adjustment varying the alignment of the transmissions received at the host; and making a second adjustment in the manner in which transmissions are transmitted from the first remote on the at least one of the tones, the second adjustment varying the alignment of the transmissions received at the host, wherein the second adjustment is finer the first adjustment.
287 Citations
15 Claims
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1. A method for a remote unit of an orthogonal frequency division multiplexing multipoint-to-point communications system, the method comprising:
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establishing communication between a first remote unit of a plurality of remote units and a host unit, the plurality of remote units communicatively coupled to the host unit in a multipoint-to-point configuration;
transmitting up to a plurality of tones from the first remote unit, the up to a plurality of tones modulated with upstream information using orthogonal frequency division multiplexing;
making a first adjustment in a manner in which transmissions are transmitted from the first remote unit on at least one of the up to a plurality of tones, the first adjustment varying the alignment of the transmissions as received at the host unit; and
making a second adjustment in the manner in which transmissions are transmitted from the first remote unit on the at least one of the up to a plurality of tones, the second adjustment varying the alignment of the transmissions as received at the host unit, wherein the second adjustment is a finer adjustment than the first adjustment. - View Dependent Claims (2, 3)
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4. A method for an orthogonal frequency division multiplexing multipoint-to-point communications system, the method comprising:
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establishing communication between a first remote unit of a plurality of remote units and a host unit, the plurality of remote units communicatively coupled to the host unit in a multipoint-to-point configuration;
receiving an orthogonal frequency division multiplexing waveform at the host unit, the orthogonal frequency division multiplexing waveform comprising a plurality of tones transmitted by the plurality of remote units. causing a first remote unit of the plurality of remote units to make a first adjustment in a manner in which transmissions are transmitted from the first remote unit on at least one of the plurality of tones, the first adjustment varying the alignment of the transmissions as received at the host unit; and
causing a second adjustment in the manner in which transmissions are transmitted from the first remote unit on the at least one of the plurality of tones, the second adjustment varying the alignment of the transmissions as received at the host unit, wherein the second adjustment is a finer adjustment than the first adjustment. - View Dependent Claims (5, 6, 7)
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8. A bi-directional communication system, the system comprising:
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a multipoint-to-point host unit; and
a plurality of remote units communicatively coupled to the multipoint-to-point host unit through an orthogonal frequency division multiplexing waveform;
wherein the multipoint-to-point host unit is configured to receive the orthogonal frequency division multiplexing waveform, the orthogonal frequency division multiplexing waveform comprising a plurality of tones transmitted by the plurality of remote units;
wherein the multipoint-to-point host unit is configured to make both coarse adjustments and fine adjustments in a manner in which transmissions are transmitted from each of the plurality of remote units on the plurality of tones. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15)
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Specification