Ranging and round trip delay timing adjustment in a multi-point to point bidirectional communication system
First Claim
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1. A method for 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 using orthogonal frequency division multiplexing and synchronized in timing and frequency such that signals from the first remote unit combine with signals from at least one other remote unit to form an orthogonal frequency division multiplexing waveform of spectrally overlapping orthogonal carriers; and
adjusting a round trip path delay associated with the first remote unit.
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Abstract
A bidirectional communication system is provided. In one embodiment, a method for an orthogonal frequency division multiplexing multipoint-to-point communications system comprises 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 using orthogonal frequency division multiplexing; and adjusting a round trip path delay associated with the first remote unit.
662 Citations
15 Claims
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1. 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 using orthogonal frequency division multiplexing and synchronized in timing and frequency such that signals from the first remote unit combine with signals from at least one other remote unit to form an orthogonal frequency division multiplexing waveform of spectrally overlapping orthogonal carriers; and adjusting a round trip path delay associated with the first remote unit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method for an orthogonal frequency division multiplexing multipoint-to-point communications system, the method comprising:
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receiving an orthogonal frequency division multiplexing (OFDM) waveform at a multipoint-to-point host unit from a plurality of remote units, the plurality of remote units synchronized in timing and frequency so that OFDM transmissions from the plurality of remote units form the orthogonal frequency division multiplexing waveform from spectrally overlapping orthogonal carriers; receiving at least one ranging signal at the multipoint-to-point host unit, the at least one ranging signal transmitted from at least one of the plurality of remote units; estimating at least one round trip path delay based on the at least one ranging signal; and adjusting the at least one round trip path delay between the multipoint-to-point host unit and the at least one of the plurality of remote units. - View Dependent Claims (10, 11, 12)
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13. 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 and synchronized in timing and frequency such that signals from the first remote unit combine with signals from at least one other remote unit of the plurality of remote units to form an orthogonal frequency division multiplexing waveform of spectrally overlapping orthogonal carriers; receiving a round trip delay adjustment based on an estimated round trip delay period between the first remote unit and the host unit; and delaying transmission of up to a plurality of tones from the first remote unit based on the round trip delay adjustment, the up to a plurality of tones modulated with upstream information using orthogonal frequency division multiplexing. - View Dependent Claims (14, 15)
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Specification