Data-specific bandwidth allocation in multipoint-to-point communication using orthgonal frequency division multiplexing
AssigneeADC Telecommunications, Inc.
InventorsMichael Geile, Harold Roberts
Life of this patent
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Abstract
A bidirectional communication system is provided. In one embodiment, a system comprises: a host unit and a plurality of remote units using a multiple access scheme to communicate at the same time with the host unit using orthogonal frequency division multiplexing (OFDM). The host unit allocates only a subset of available orthogonal tones within the OFDM system to at least one of the plurality of remote units. The host unit allocates a number of orthogonal tones to the at least one remote unit for upstream transmission based at least in part on a type of data to be transmitted by the at least one remote unit.
Claims11
A multipoint-to-point, orthogonal frequency division multiplexed (OFDM) communication system comprising:
- a plurality of remote units,
- a host unit that includes a demodulator;
- wherein each of the remote units transmits an upstream OFDM signal using a multiple access scheme to the host unit demodulator using at least one of a plurality of orthogonal tones within an OFDM waveform,
- wherein the host unit receives the upstream OFDM signals from a plurality of the remote units, the tones of the upstream signals being substantially orthogonal when received at the host unit;
- wherein portions of upstream OFDM signals from at least two of the remote units arrive at the host unit at the same time,
- wherein the host unit demodulator demodulates said portions, and
- wherein the host unit allocates to a first remote unit up to a plurality of the orthogonal tones for upstream payload signal transmission based at least in part on a characteristic of data to be transmitted by the first remote unit.
A system comprising:
- a host unit;
- a plurality of remote units using a multiple access scheme to communicate at the same time with the host unit using orthogonal frequency division multiplexing (OFDM);
- wherein the host unit allocates only a subset of available orthogonal tones within the OFDM system to at least one of the plurality of remote units, and
- wherein the host unit allocates a number of orthogonal tones to the at least one remote unit for upstream transmission based at least in part on a type of data to be transmitted by the at least one remote unit.
Dependencies are inferred from the claim text.