Methodology and method and apparatus for signaling with capacity optimized constellations
DCFirst Claim
1. A digital communication system, comprising:
- a transmitter capable of transmitting signals via a communication channel, the transmitter comprising;
a coder capable of receiving user bits and outputting encoded bits at a data rate;
a mapper capable of mapping encoded bits to symbols in a symbol constellation; and
a modulator capable of generating a modulated signal for transmission via the communication channel using symbols generated by the mapper;
wherein the symbol constellation is an unequally spaced symbol constellation that is characterizable by assignment of locations and labels of constellation points to maximize parallel decode capacity of the symbol constellation at a given signal-to-noise ratio so that the symbol constellation provides a given capacity at a reduced signal-to-noise ratio compared to a uniform symbol constellation that differs from the symbol constellation only in that the minimum distance, dmin, between constellation points of the uniform symbol constellation is maximized.
2 Assignments
Litigations
1 Petition
Accused Products
Abstract
Communication systems are described that use unequally spaced constellations that have increased capacity compared to conventional constellations operating within a similar SNR band. One embodiment is a digital communications system including a transmitter transmitting signals via a communication channel, the transmitter including a coder capable of receiving user bits and outputting encoded bits at a rate, a mapper capable of mapping encoded bits to symbols in a constellation, and a modulator capable of generating a modulated signal for transmission via the communication channel using symbols generated by the mapper, wherein the constellation is unequally spaced and characterizable by assignment of locations and labels of constellation points to maximize parallel decode capacity of the constellation at a given signal-to-noise ratio so that the constellation provides a given capacity at a reduced signal-to-noise ratio compared to a uniform constellation that maximizes the minimum distance between constellation points of the uniform constellation.
76 Citations
40 Claims
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1. A digital communication system, comprising:
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a transmitter capable of transmitting signals via a communication channel, the transmitter comprising; a coder capable of receiving user bits and outputting encoded bits at a data rate; a mapper capable of mapping encoded bits to symbols in a symbol constellation; and a modulator capable of generating a modulated signal for transmission via the communication channel using symbols generated by the mapper; wherein the symbol constellation is an unequally spaced symbol constellation that is characterizable by assignment of locations and labels of constellation points to maximize parallel decode capacity of the symbol constellation at a given signal-to-noise ratio so that the symbol constellation provides a given capacity at a reduced signal-to-noise ratio compared to a uniform symbol constellation that differs from the symbol constellation only in that the minimum distance, dmin, between constellation points of the uniform symbol constellation is maximized. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. A digital communication system, comprising:
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a receiver capable of receiving signals via a communication channel, the receiver comprising; a demodulator capable of demodulating a signal received via the communication channel; a demapper capable of estimating likelihoods from the demodulated signal using a symbol constellation; a decoder that is capable of estimating decoded bits from the likelihoods generated by the demapper; and wherein the symbol constellation is an unequally spaced symbol constellation that is characterizable by assignment of locations and labels of constellation points that maximize parallel decode capacity of the symbol constellation at a given signal-to-noise ratio so that the symbol constellation provides a given capacity at a reduced signal-to-noise ratio compared to a uniform symbol constellation that differs from the symbol constellation only in that the minimum distance, dmin, between constellation points of the uniform symbol constellation is maximized. - View Dependent Claims (21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36)
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37. A digital communication system, comprising:
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a receiver capable of receiving signals via a communication channel, wherein the receiver comprises; a demodulator capable of demodulating a signal received via the communication channel; a demapper capable of estimating likelihoods from the demodulated signal using a symbol constellation selected from a plurality of symbol constellations; and a decoder that is capable of estimating decoded bits from the likelihoods generated by the demapper; wherein the selected symbol constellation is an unequally spaced symbol constellation that is characterizable by assignment of locations and labels of constellation points that maximize parallel decode capacity of the selected symbol constellation at a given signal-to-noise ratio so that the selected symbol constellation provides a given capacity at a reduced signal-to-noise ratio compared to a uniform symbol constellation that differs from the selected symbol constellation only in that the minimum distance, dmin, between constellation points of the uniform symbol constellation is maximized; and wherein the receiver further comprises a local transmitter capable of sending a request to a remote transmitter to use a given symbol constellation from the plurality of symbol constellations. - View Dependent Claims (38)
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39. A digital communication system, comprising:
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a transmitter configured to transmit signals via a communication channel; wherein the transmitter, comprises; a coder configured to receive user bits and output encoded bits at an expanded output encoded bit rate; a mapper configured to map encoded bits to symbols in a modulated symbol constellation; and a modulator configured to generate a modulated signal for transmission via the communication channel using symbols generated by the mapper; wherein the transmitter is characterized in that the symbol constellation is an unequally spaced symbol constellation obtained by optimizing locations and labeling of constellation points to maximize parallel decode capacity at a given signal-to-noise ratio so that the symbol constellation provides a given capacity at a reduced signal-to-noise ratio compared to a uniform symbol constellation that maximizes the minimum distance, dmin, between the constellation points of the uniform symbol constellation.
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40. A digital communication system, comprising:
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a receiver configured to receive signals via a communication channel;
the receiver comprising;a demodulator configured to demodulate a signal received via the communication channel; a demapper configured to estimate likelihoods from the demodulated signal using a symbol constellation; a decoder that is configured to estimate decoded bits from the likelihoods generated by the demapper; and wherein the receiver is characterized in that the symbol constellation is an unequally spaced symbol constellation obtained by optimizing locations and labeling of constellation points to maximize parallel decode capacity at a given signal-to-noise ratio so that the symbol constellation provides a given capacity at a reduced signal-to-noise ratio compared to a uniform symbol constellation that maximizes the minimum distance, dmin, between the constellation points of the uniform symbol constellation.
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Specification