US2007253500A1PendingUtilityA1
Method for multiple use subchannels
Est. expiryMay 20, 2016(expired)· nominal 20-yr term from priority
Inventors:Mark J. DapperMichael J. GeileTerrance J. HillHarold A. RobertsBrian D. AndersonJeffrey BredeMark S. WadmanRobert J. KirschtJames J. HerrmannMichael J. FortSteven P. BuskaJeff SolumDebra Lea EnfieldDarrell BergThomas SmigelskiThomas C. TuckerJoe HallJohn M. LogajanSomvay BoualouangHeng LouMark ElpersMatt DownsTammy FerrisAdam OpoczynskiDavid S. RussellCalvin G. NelsonNiranjan R. SamantJoseph F. ChiappettaScott Sarnikowski
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Claims
Abstract
Methods for multiple use subchannels are provided. In one embodiment, a method for an orthogonal frequency division multiplexing (OFDM) 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; transmitting up to a plurality of tones from the first remote unit, the up to a plurality of tones modulated with upstream information using OFDM; adjusting a carrier frequency of the up to a plurality of tones such that when any tones are transmitted from a first remote unit and a least one other remote unit, the orthogonality of the tones when received at the host unit is improved; and transmitting both control data and payload data on at least one of the up to a plurality of tones from the first remote unit.
Claims
exact text as granted — not AI-modified1 . 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; 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; adjusting a carrier frequency of the up to a plurality of tones such that when any tones are transmitted from a first remote unit and a least one other remote unit of the plurality of remote units, the orthogonality of the tones when received at the host unit is improved; and transmitting both control data and payload data on at least one of the up to a plurality of tones from the first remote unit.
2 . The method of claim 1 , wherein the control data comprises control symbols and the payload data comprises payload symbols.
3 . The method of claim 1 , further comprising sharing upstream bandwidth capacity among the plurality of remote units using a time division multiple access scheme in which control data is transmitted on the first tone of the plurality of tones during a first time period and payload data is transmitted on the first tone of the plurality of tones during a second time period.
4 . The method of claim 1 , further comprising:
adjusting a carrier amplitude and a phase of the up to a plurality of tones such that when any tones are transmitted from a first remote unit and at least one other remote unit of the plurality of remote units, the orthogonality of the tones when received at the host unit is improved.
5 . A method for an orthogonal frequency division multiplexing multipoint-to-point communications system, the method comprising:
receiving an orthogonal frequency division multiplexing waveform at a multipoint-to-point host unit, the orthogonal frequency division multiplexing waveform comprising a plurality of tones transmitted by a plurality of remote units; communicating between a first remote unit of the plurality of remote units and the multipoint-to-point host unit, the plurality of remote units communicatively coupled to the multipoint-to-point host unit in a multipoint-to-point configuration; adjusting a carrier frequency of the up to a plurality of tones such that when any tones are transmitted from a first remote unit and at least one other remote unit of the plurality of remote units, the orthogonality of the tones when received at the host unit is improved; and receiving on a first tone of the plurality of tones both control data and payload data.
6 . The method of claim 5 , wherein the control data comprises control symbols and the payload data comprises payload symbols.
7 . The method of claim 5 , wherein receiving on a first tone of the plurality of tones both control data and payload data further comprises:
receiving control data transmitted on the first tone of the plurality of tones during a first time period; and receiving payload data transmitted on the first tone of the plurality of tones during a second time period.
8 . The method of claim 5 , further comprising:
adjusting a carrier amplitude and a phase of the up to a plurality of tones such that when any tones are transmitted from a first remote unit and at least one other remote unit of the plurality of remote units, the orthogonality of the tones when received at the host unit is improved.
9 . 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 provided by using orthogonal frequency division multiplexing with a plurality of tones; adjusting a carrier frequency of the up to a plurality of tones such that when any tones are transmitted from a first remote unit and at least one other remote unit of the plurality of remote units, the orthogonality of the tones when received at the host unit is improved; and transmitting on a first tone of the plurality of tones both control data and payload data.
10 . The method of claim 9 , wherein the control data comprises control symbols and the payload data comprises payload symbols.
11 . The method of claim 9 , further comprising sharing upstream bandwidth capacity among the plurality of remote units using a time division multiple access scheme in which control data is transmitted on the first tone of the plurality of tones during a first time period and payload data is transmitted on the first tone of the plurality of tones during a second time period.
12 . The method of claim 9 , further comprising:
adjusting a carrier amplitude and a phase of the up to a plurality of tones such that when any tones are transmitted from a first remote unit and at least one other remote unit of the plurality of remote units, the orthogonality of the tones when received at the host unit is improved.Cited by (0)
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