Synchronization of remote units using multiple adjustments
First Claim
1. A method for a remote unit of an orthogonal frequency division multiplexing multipoint-to-point communications system, the method comprising:
- transmitting up to a plurality of tones from a first remote unit, the up to a plurality of tones modulated with upstream information using orthogonal frequency division multiplexing and configured to combine with tones from at least one other remote unit to form an orthogonal frequency division multiplexing waveform of spectrally overlapping orthogonal carriers;
transmitting a first signal from the first remote unit, the first signal providing for a first adjustment of 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
transmitting a second signal from the first remote unit, the second signal providing for a second adjustment of 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 signal is different than the first signal.
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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.
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Citations
14 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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transmitting up to a plurality of tones from a first remote unit, the up to a plurality of tones modulated with upstream information using orthogonal frequency division multiplexing and configured to combine with tones from at least one other remote unit to form an orthogonal frequency division multiplexing waveform of spectrally overlapping orthogonal carriers; transmitting a first signal from the first remote unit, the first signal providing for a first adjustment of 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 transmitting a second signal from the first remote unit, the second signal providing for a second adjustment of 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 signal is different than the first signal. - 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 comprising spectrally overlapping orthogonal carriers 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 based on a first signal received from the first remote unit, the first adjustment varying the alignment of the transmissions as received at the host unit; and causing the first remote unit of the plurality of remote units to make 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 based on a second signal received from the first remote unit, the second adjustment varying the alignment of the transmissions as received at the host unit, wherein the second signal is different than the first signal. - 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 comprising spectrally overlapping orthogonal carriers, 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 adjustments to a manner in which transmissions are transmitted from each of the plurality of remote units on the plurality of tones based on a first signal and a second signal received from each of the plurality of remote units, wherein the first signal is different than the second signal. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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Specification