Methodology and method and apparatus for signaling with capacity optimized constellations
First Claim
1. A digital communication system, comprising:
- a transmitter configured to transmit signals to a receiver 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 using a code;
a mapper configured to map said encoded bits to symbols in a phase shift keyed (PSK) symbol constellation;
a modulator configured to generate a signal for transmission via the communication channel using symbols generated by the mapper;
wherein the PSK symbol constellation is a geometrically spaced symbol constellation in which the phases of the constellation points are optimized for capacity using parallel decode capacity that provides a given capacity at a reduced signal-to-noise ratio compared to a PSK signal constellation that maximizes dmin.
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Abstract
Design Methodology and Method and Apparatus for Signaling with Capacity Optimized Constellation Abstract Communication systems are described that use geometrically PSK shaped constellations that have increased capacity compared to conventional PSK constellations operating within a similar SNR band. The geometrically shaped PSK constellation is optimized based upon parallel decoding capacity. In many embodiments, a capacity optimized geometrically shaped constellation can be used to replace a conventional constellation as part of a firmware upgrade to transmitters and receivers within a communication system. In a number of embodiments, the geometrically shaped constellation is optimized for an Additive White Gaussian Noise channel or a fading channel. In numerous embodiments, the communication uses adaptive rate encoding and the location of points within the geometrically shaped constellation changes as the code rate changes.
66 Citations
19 Claims
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1. A digital communication system, comprising:
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a transmitter configured to transmit signals to a receiver 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 using a code; a mapper configured to map said encoded bits to symbols in a phase shift keyed (PSK) symbol constellation; a modulator configured to generate a signal for transmission via the communication channel using symbols generated by the mapper; wherein the PSK symbol constellation is a geometrically spaced symbol constellation in which the phases of the constellation points are optimized for capacity using parallel decode capacity that provides a given capacity at a reduced signal-to-noise ratio compared to a PSK signal constellation that maximizes dmin. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A digital communication system, comprising:
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a receiver configured to receive signals transmitted via communication channel using a PSK constellation; wherein the receiver, comprises; a demodulator configured to demodulate the received signal via the communication channel; a demapper configured to estimate likelihoods of symbols in a PSK constellation from the demodulated signal; a decoder that is configured to estimate the likelihood of decoded bits from the likelihoods generated by the demapper based upon a code; and wherein the PSK symbol constellation is a geometrically spaced symbol constellation in which the phases of the constellation points are optimized for capacity using parallel decode capacity that provides a given capacity at a reduced signal-to-noise ratio compared to a PSK signal constellation that maximizes dmin. - View Dependent Claims (14, 15, 16, 17, 18, 19)
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Specification