Near-end, far-end and echo cancellers in a multi-channel transceiver system
First Claim
1. A transceiver, comprising:
- a receiver portion including at least one receiver to receive signals from a complementary transmitter through a single differential electrically conducting pair, the at least one receiver including a plurality of demodulators to receive the signals from a corresponding plurality of frequency separated channels, wherein the plurality of demodulators includes at least one down-converting demodulator, the down-converting demodulator comprising;
an analog down converter coupled to receive an analog signal from the transmission medium and generate base-band signals corresponding to signals transmitted at a specific carrier frequency on the transmission medium;
an analog-to-digital converter coupled to the down converter to provide a digitized base-band signal; and
a decoder coupled to the analog-to-digital converter to provide data signals in response to the base-band signals; and
an interference filter coupled to the receiver portion to substantially reduce interference in signals received by the receiver portion that result from transmission coupled to each of the plurality of corresponding frequency separated channels from transmitters other than the complementary transmitter.
2 Assignments
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Accused Products
Abstract
A transceiver according to the present invention receives data from a plurality of frequency separated transmission channels from a complementary transmitter and includes an interference filter for correcting for interference from transmitters other than the complementary transmitter. The interference filter, for example, can correct for near-end cross-talk and echo interference filtering and/or far-end crosstalk interference filtering is presented. A transceiver can include a transmitter portion and a receiver portion with one or more receivers coupled to receives signals in the plurality of frequency separated transmission channels. A baseband transmitter can be combined with one or more transmitters that transmit data into one of the frequency separated transmission bands. Any combination of modulation systems can be utilized (e.g. PAM for the baseband and QAM for the frequency separated bands). In some embodiments, one baseband PAM transmitter is combined with one or more frequency separated QAM transmitters.
82 Citations
65 Claims
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1. A transceiver, comprising:
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a receiver portion including at least one receiver to receive signals from a complementary transmitter through a single differential electrically conducting pair, the at least one receiver including a plurality of demodulators to receive the signals from a corresponding plurality of frequency separated channels, wherein the plurality of demodulators includes at least one down-converting demodulator, the down-converting demodulator comprising; an analog down converter coupled to receive an analog signal from the transmission medium and generate base-band signals corresponding to signals transmitted at a specific carrier frequency on the transmission medium; an analog-to-digital converter coupled to the down converter to provide a digitized base-band signal; and a decoder coupled to the analog-to-digital converter to provide data signals in response to the base-band signals; and an interference filter coupled to the receiver portion to substantially reduce interference in signals received by the receiver portion that result from transmission coupled to each of the plurality of corresponding frequency separated channels from transmitters other than the complementary transmitter. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37)
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38. A method of receiving data from a single differential electrically conducting pair, comprising:
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receiving signals into a plurality of demodulators from a corresponding plurality of frequency separated channels transmitted on the differential electrically conducting pair by a complementary transmitter; in at least one of the plurality of demodulators, analog down-converting the signal at the frequency of the frequency separated channel corresponding to the demodulator to a base-band signal, filtering out signals not at the base-band frequency, digitizing the base-band signal to form a digitized signal, and correcting the digitized signal to remove interference resulting from transmitters other than the complementary transmitter to form corrected signals; and recovering data transmitted by the complementary transmitter from signals related to the corrected signals for each of the plurality of demodulators. - View Dependent Claims (39, 40, 41, 42, 43, 44)
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45. A transceiver system, comprising:
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a transceiver comprising a first transmitter including plurality of modulators, each of the plurality of modulators transmitting into one of a first plurality of frequency separated channels on a transmission medium, and a first receiver including a plurality of demodulators, each of the plurality of demodulators receiving signals from one of a second plurality of frequency separated channels on the transmission medium; and a complementary transceiver, the complementary transceiver including a complementary first receiver coupled to receive signals corresponding to signals transmitted into one of the first plurality of frequency separated channels on the transmission medium by the first transmitter, and a complementary first transmitter coupled to transmit signals into the second plurality of frequency separated channels on the transmission medium to be received by the first receiver; and wherein the transceiver includes an interference filter coupled to the first receiver, the interference filter removing interference that result from transmitters other than the complementary first transmitter from signals in the first receiver, and wherein the first plurality of frequency separated channels and the second plurality of frequency separated channels are each transmitted on a single differential conducting pair. - View Dependent Claims (46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59)
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60. A communication device, comprising:
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a receiver to receive signals on a set of frequency separated channels from a complementary transmitter, the set of frequency separated channels being transmitted on a single conducting twisted copper pair, the receiver including a plurality of demodulators, each of the plurality of demodulators analog down converting one of the frequency separated channels to a base-band signal and digitizing the base-band signal; and a filtering unit to correct for interference in the signals from a transmitter other than the complementary transmitter.
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61. A transceiver, comprising
means for receiving signals from a plurality of frequency separated channels transmitted from a complementary transmitter through a single differential conducting pair, the means for receiving including a plurality of demodulators, each of the plurality of demodulators analog down-converting one of the plurality of frequency separated channels to a base-band signal and digitizing the base-band signal; - and
means for correcting for interference from the effects of transmitters other than the complementary transmitter transmitting on the single differential conducting pair. - View Dependent Claims (62, 63, 64, 65)
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Specification