Systems for synchronous multipoint-to-point orthogonal frequency division multiplexing communication
First Claim
1. A head end controller that controls a plurality of service units in a telecommunications system with a multi-carrier transmission scheme, the head end controller comprising:
- a logic circuit that generates control messages for the plurality of service units, wherein each service unit is assigned to at least one subband of a transmission bandwidth;
a transceiver that is coupled to a distribution network of the transmission system, wherein the transceiver broadcasts control messages to the plurality of service units; and
wherein the plurality of service units are configured to use a multiple access scheme to transmit on a radio frequency carrier using orthogonal frequency division multiplexing (OFDM) so that transmissions from the plurality of service unit are received from the distribution network at the transceiver synchronized within an OFDM waveform.
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Accused Products
Abstract
A head end controller is described. The head end controller controls a plurality of service units in a telecommunications system with a multi-carrier transmission scheme. The head end controller includes a logic circuit that generates control messages for the plurality of service units. Each service unit is assigned to at least one subband of a transmission bandwidth. The head end controller further includes a transceiver that is coupled to a distribution network of the transmission system, wherein the transceiver broadcasts control messages to the plurality of service units. The plurality of service units are configured to use a multiple access scheme to transmit on a radio frequency carrier using orthogonal frequency division multiplexing (OFDM) so that transmissions from the plurality of service unit are received from the distribution network at the transceiver synchronized within an OFDM waveform.
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Citations
11 Claims
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1. A head end controller that controls a plurality of service units in a telecommunications system with a multi-carrier transmission scheme, the head end controller comprising:
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a logic circuit that generates control messages for the plurality of service units, wherein each service unit is assigned to at least one subband of a transmission bandwidth; a transceiver that is coupled to a distribution network of the transmission system, wherein the transceiver broadcasts control messages to the plurality of service units; and wherein the plurality of service units are configured to use a multiple access scheme to transmit on a radio frequency carrier using orthogonal frequency division multiplexing (OFDM) so that transmissions from the plurality of service unit are received from the distribution network at the transceiver synchronized within an OFDM waveform. - View Dependent Claims (2, 3, 4)
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5. A head end controller that controls a plurality of service units in a telecommunications system with a multi-carrier transmission scheme, the head end controller comprising:
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a logic circuit that generates control messages for the plurality of service units, wherein each service unit is assigned to at least one subband of a transmission bandwidth; a transceiver that is coupled to a distribution network of the transmission system, wherein the transceiver broadcasts the control messages to the plurality of service units; and wherein the logic circuit generates control messages to at least one of the plurality of service units to synchronize the at least one of the plurality of service units such that a plurality of tones in an Orthogonal Frequency Division Multiplexing (OFDM) waveform are orthogonal at the transceiver. - View Dependent Claims (6, 7, 8, 9, 10)
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11. A head end controller that controls a plurality of service units in a telecommunications system with a multi-carrier transmission scheme, the head end controller comprising:
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a logic circuit that generates control messages for the plurality of service units, wherein each service unit is assigned to at least one subband of a transmission bandwidth; a transceiver that is coupled to a distribution network of the transmission system, wherein the transceiver broadcasts the control messages to the plurality of service units; and wherein the transceiver receives an orthogonal frequency division multiplexing waveform, the orthogonal frequency division multiplexing waveform comprising a plurality of tones transmitted by the plurality of service units; wherein the logic circuit is configured to transmit frequency, amplitude and phase adjustment information to a first service unit of the plurality of service units so that when any tones are transmitted from the first service unit and at least one other service unit of the plurality of service units, the plurality of tones are substantially orthogonal when received at the host unit.
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Specification