Communication system with multicarrier telephony transport
First Claim
1. A communications system for transferring digital data over a distribution network, comprising:
- an interface for receiving successive strings of digital data from a source, each string representing a certain number of bits;
a symbol mapper for converting the strings into a sequence of symbols representing a constellation of discrete values of the amplitude and phase of a carrier for a predetermined period, wherein adjacent ones of the amplitude and phase values generally represent data strings having at least as few differences among the bits of their corresponding strings as do nonadjacent ones of the amplitude and phase values;
a modulator for synthesizing at least one carrier from said symbols; and
a transmitter for sending the modulated carrier over a distribution network.
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Accused Products
Abstract
A communications system for transferring digital data over a distribution network is described. The communications system includes an interface for receiving successive strings of digital data from a source, each string representing a certain number of bits and a symbol mapper for converting the strings into a sequence of symbols representing a constellation of discrete values of the amplitude and phase of a carrier for a predetermined period. The adjacent ones of the amplitude and phase values generally represent data strings having at least as few differences among the bits of their corresponding strings as do nonadjacent ones of the amplitude and phase values. The system further includes a modulator for synthesizing at least one carrier from said symbols, and a transmitter for sending the modulated carrier over a distribution network.
132 Citations
11 Claims
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1. A communications system for transferring digital data over a distribution network, comprising:
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an interface for receiving successive strings of digital data from a source, each string representing a certain number of bits;
a symbol mapper for converting the strings into a sequence of symbols representing a constellation of discrete values of the amplitude and phase of a carrier for a predetermined period, wherein adjacent ones of the amplitude and phase values generally represent data strings having at least as few differences among the bits of their corresponding strings as do nonadjacent ones of the amplitude and phase values;
a modulator for synthesizing at least one carrier from said symbols; and
a transmitter for sending the modulated carrier over a distribution network. - View Dependent Claims (2, 3, 4)
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5. A communications system for transferring digital data over a distribution network, comprising:
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an interface for receiving successive strings of digital data from a source, each string representing a certain number of bits;
a symbol mapper for converting the strings into a sequence of symbols representing a constellation of discrete values of the amplitude and phase of a carrier for a predetermined period, wherein the constellation is rotationally asymmetric for valid ones of the data strings;
a modulator for synthesizing a plurality of orthogonal carriers from said symbols; and
a transmitter for sending the modulated carriers over a distribution network.
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6. A method of transmitting data in a communications system, the method comprising:
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receiving multiple serial strings of digital data;
randomizing the serial strings of digital data;
converting the randomized strings into randomized digital symbols representing the strings of digital data;
converting the randomized symbols into digital representations of multiple modulated orthogonal carriers;
converting the digital representations into an analog waveform; and
transmitting the analog waveform over a distribution network. - View Dependent Claims (7)
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8. A method of digital data over a distribution network in a communications system, comprising:
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receiving successive strings of digital data from a source, each string representing a certain number of bits;
converting each string of digital data into a sequence of symbols representing a constellation of discrete values of the amplitude and phase of a carrier for a predetermined period, wherein adjacent amplitude and phase values generally represent data strings having at least as few differences among the bits of their corresponding strings as do nonadjacent amplitude and phase values;
synthesizing at least one carrier from the symbols; and
transmitting the at least one carrier over a distribution network. - View Dependent Claims (9, 10, 11)
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Specification