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US 11,082,266 B2Granted
Probabilistic amplitude shaping
AssigneeNokia Solutions and Networks Oy
InventorsLuca Gabriele Razzetti, Giancarlo Gavioli, Carlo Costantini, Sara Caobianco
Life of this patent
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Abstract
An apparatus, comprising: circuitry configured, in response to receipt of input data, to transmit a stream of symbols of a constellation to a modulator for modulation onto a carrier wherein a frequency of occurrence of symbols in the stream is dependent upon a probability-amplitude distribution for symbols of the constellation, wherein the probability-amplitude distribution has a kurtosis less than a target value and a shape of the probability-amplitude distribution causes low-amplitude symbols to occur more frequently on average in the stream than high-amplitude symbols.
Claims16
An apparatus, comprising:
- circuitry configured, in response to receipt of input data, to transmit a stream of symbols of a constellation to a modulator for modulation onto a carrier, wherein a frequency of occurrence of symbols in the stream is dependent upon a probability-amplitude distribution for symbols of the constellation, wherein the probability-amplitude distribution has a kurtosis less than a target value and a shape of the probability-amplitude distribution causes low-amplitude symbols to occur more frequently on average in the stream than high-amplitude symbols;
- and
- wherein the target value is a programmable target value.
An optical communication system comprising:
- a transmitter comprising an apparatus comprising circuitry configured, in response to receipt of input data, to transmit a stream of symbols of a constellation to a modulator for modulation onto a carrier, wherein a frequency of occurrence of symbols in the stream is dependent upon a probability-amplitude distribution for symbols of the constellation, wherein the probability-amplitude distribution has a kurtosis less than a target value and a shape of the probability-amplitude distribution causes low-amplitude symbols to occur more frequently on average in the stream than high-amplitude symbols, wherein the transmitter is configured to transmit the carrier onto which the stream of symbols of the constellation has been modulated;
- and
- a receiver comprising a circuitry configured, in response to receipt of the carrier, to demodulate the carrier to obtain the stream of symbols of the constellation and use the probability-amplitude distribution for symbols of the constellation to obtain an estimate of the input data, wherein the receiver comprises a circuitry for performing blind equalization to produce a stream of signals and an inverse constellation re-mapper configured, in response to receipt of the stream of symbols of a constellation, to map the stream of symbols to a different stream of symbols of the constellation wherein the different stream of symbols has a higher kurtosis than the stream of symbols.
A method comprising:
- causing probabilistic amplitude shaping by mapping an input data stream to a first stream of symbols of a constellation such that the first stream has symbols of lower energy that are more probable than other symbols;
- and
- re-mapping the first stream of symbols to produce a second stream of symbols of the same constellation such that the second stream has a probability distribution of the symbols that is of lower kurtosis than a probability distribution of the first stream.
An apparatus, comprising:
- a digital mapper to cause probabilistic amplitude shaping by mapping an input data stream to a first stream of symbols of a constellation such that the first stream has symbols of lower energy more probable than other symbols in response to the input data stream being random or pseudorandom;
- and
- a digital re-mapper to map the first stream of symbols into a second stream of symbols of the same constellation such that the second stream has a probability distribution of the symbols of lower kurtosis than the first stream in response to the input data stream being random or pseudorandom.
An apparatus, comprising:
- circuitry configured, in response to receipt of input data, to transmit a stream of symbols of a constellation to a modulator for modulation onto a carrier, wherein a frequency of occurrence of symbols in the stream is dependent upon a probability-amplitude distribution for symbols of the constellation, wherein the probability-amplitude distribution has a kurtosis less than a target value and a shape of the probability-amplitude distribution causes low-amplitude symbols to occur more frequently on average in the stream than high-amplitude symbols;
- and
- wherein, for increasing data rates for the input data, the transmitted stream of symbols of the constellation has a probability-amplitude distribution with a constant or increasing kurtosis.
An apparatus, comprising:
- circuitry configured, in response to receipt of input data, to transmit a stream of symbols of a constellation to a modulator for modulation onto a carrier, wherein a frequency of occurrence of symbols in the stream is dependent upon a probability-amplitude distribution for symbols of the constellation, wherein the probability-amplitude distribution has a kurtosis less than a target value and a shape of the probability-amplitude distribution causes low-amplitude symbols to occur more frequently on average in the stream than high-amplitude symbols;
- and
- wherein the circuitry comprises:
- a probabilistic amplitude shaping symbol source circuit configured, in response to receipt of the input data, to produce the first stream of symbols of the constellation for modulation wherein a frequency of occurrence of symbols in the first stream is dependent upon a probability-amplitude distribution for symbols of the constellation, wherein the probability-amplitude distribution is a probability-amplitude distribution that causes low-amplitude symbols to occur more frequently on average in the first stream than high-amplitude symbols;
- and
- a constellation re-mapper circuit configured, in response to receipt of the first stream of symbols, to map the first stream of symbols to a second stream of symbols of the constellation for modulation and to produce the second stream of symbols wherein the second stream of symbols has a lower kurtosis than the first stream of symbols.
3 more elements
Dependencies are inferred from the claim text.