Systems for contention-based bandwidth requests in orthogonal frequency division multiplexing systems
First Claim
1. A bidirectional communication system, the system comprising:
- a first remote unit for communicating with a host unit using orthogonal frequency division multiplexing, the host unit communicatively coupled to a plurality of remote units in a multipoint-to-point configuration;
wherein the first remote unit is configured to transmit up to a plurality of tones, the up to a plurality of tones modulated with upstream information using orthogonal frequency division multiplexing;
wherein the first remote unit is configured to determine when bandwidth is needed for upstream transmission to the host unit;
wherein the first remote unit is configured to transmit a request for bandwidth to the host unit on a first tone of the plurality of tones, wherein access to the first tone is contention-based; and
the first remote unit including a modulator for modulating the up to a plurality of tones with upstream information using orthogonal frequency division multiplexing, wherein the modulator is configured to adjust a carrier frequency, a carrier amplitude, and a phase of at least one tone of the up to a plurality of tones such that when any tones are transmitted from the first remote unit and at least one other remote unit of the plurality of remote units, the any tones transmitted from the first remote unit and the at least one other remote unit are orthogonal when received at the host unit.
3 Assignments
0 Petitions
Accused Products
Abstract
Systems for contention-based bandwidth requests in orthogonal frequency division multiplexing (OFDM) systems are provided. In one embodiment, a bi-directional communication system comprises: a multipoint-to-point host unit; and a plurality of remote units communicatively coupled to the multipoint-to-point host unit through an OFDM waveform. The multipoint-to-point host unit is configured to receive the OFDM waveform, the OFDM comprising a plurality of tones transmitted by the plurality of remote units. A first remote unit of the plurality of remote units is configured to transmit a request for bandwidth to the host unit on a tone of the plurality of tones, wherein access to the tone is contention-based. The multipoint-to-point host unit is configured to direct a modem to transmit information on at least one tone of the OFDM waveform based on whether the modem successfully receives the request for bandwidth from the first remote unit of the plurality of remote units.
147 Citations
9 Claims
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1. A bidirectional communication system, the system comprising:
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a first remote unit for communicating with a host unit using orthogonal frequency division multiplexing, the host unit communicatively coupled to a plurality of remote units in a multipoint-to-point configuration; wherein the first remote unit is configured to transmit up to a plurality of tones, the up to a plurality of tones modulated with upstream information using orthogonal frequency division multiplexing; wherein the first remote unit is configured to determine when bandwidth is needed for upstream transmission to the host unit; wherein the first remote unit is configured to transmit a request for bandwidth to the host unit on a first tone of the plurality of tones, wherein access to the first tone is contention-based; and the first remote unit including a modulator for modulating the up to a plurality of tones with upstream information using orthogonal frequency division multiplexing, wherein the modulator is configured to adjust a carrier frequency, a carrier amplitude, and a phase of at least one tone of the up to a plurality of tones such that when any tones are transmitted from the first remote unit and at least one other remote unit of the plurality of remote units, the any tones transmitted from the first remote unit and the at least one other remote unit are orthogonal when received at the host unit. - View Dependent Claims (2, 3, 4)
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5. 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 a first remote unit of the plurality of remote units is configured to transmit a request for bandwidth to the host unit on a first tone of the plurality of tones, wherein access to the first tone is contention-based; wherein the multipoint-to-point host unit is configured to direct a modem to transmit information on at least one tone of the orthogonal frequency division multiplexing waveform based on whether the modem successfully receives the request for bandwidth from the first remote unit of the plurality of remote units; and the plurality of remote units each including a modulator for modulating the up to a plurality of tones with upstream information using orthogonal frequency division multiplexing, the modulator configured to adjust a carrier frequency, a carrier amplitude, and a phase of at least one tone of the up to a plurality of tones such that when any tones are transmitted from the first remote unit and at least one other remote unit of the plurality of remote units, the any tones transmitted from the first remote unit and the at least one other remote unit are orthogonal when received at the host unit. - View Dependent Claims (6, 7, 8, 9)
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Specification