Coded polarization-multiplexed iterative polar modulation
AssigneeNEC Laboratories America, Inc.
InventorsIvan B. Djordjevic, Lei Xu, Ting Wang
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Abstract
Systems and methods for optical communication that use a transmitter/receiver. The systems and methods include receiving a modulated, encoded input stream. Channel memory is reduced using coarse digital backpropagation and other channel impairments are removed using turbo equalization. Symbols are detected in the input stream that conform to a non-uniform, polar constellation having a Gaussian source distribution to produce a stream of encoded data. The stream of encoded data is decoded with one or more low density parity check (LDPC) decoders.
Claims20
A method for receiving, comprising:
- receiving a modulated, encoded input stream;
- reducing channel memory using coarse digital backpropagation;
- removing channel impairments using turbo equalization;
- detecting symbols in the input stream that conform to a non-uniform, polar constellation having a Gaussian source distribution to produce a stream of encoded data;
- and
- decoding the stream of encoded data with one or more low density parity check (LDPC) decoders.
A method for transmitting, comprising:
- encoding one or more streams of input data with one or more low density parity check encoders to produce one or more encoded data streams;
- mapping the one or more encoded data streams to symbols that conform to a non-uniform, polar constellation derived from a Gaussian source distribution;
- and
- modulating the symbols onto an optical carrier beam.
A receiver, comprising:
- one or more detectors, each configured to extract symbols that conform to a non-uniform, polar constellation having a Gaussian source distribution from a carrier beam and to output a coded stream;
- one or more log likelihood ratio (LLR) modules configured to generate LLR information for the respective coded streams, comprising a lookup table configured to store correspondences between bit sequences and the symbols;
- and
- one or more decoder, each configured to accept a coded stream and the associated LLR information and to produce a decoded data stream.
A transmitter, comprising:
- one or more low density parity check (LDPC) encoders, each configured to encode one or more streams of input data to produce one or more encoded data streams
- a mapper, configured to map the one or more encoded data streams to symbols that conform to a non-uniform, polar constellation derived from a Gaussian source distribution;
- and
- a modulator, configured to modulate the symbols onto a first optical carrier beam.
Dependencies are inferred from the claim text.