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Methodology and method and apparatus for signaling with capacity optimized constellations

  • US 9,743,292 B2
  • Filed: 07/01/2016
  • Issued: 08/22/2017
  • Est. Priority Date: 06/05/2007
  • Status: Active Grant
First Claim
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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;

    a mapper configured to map said encoded bits to symbols in a first symbol constellation, wherein the first symbol constellation comprises a set of non-uniformly spaced points;

    a modulator configured to generate a signal for transmission via the communication channel using symbols generated by the mapper;

    wherein the receiver, comprises;

    a demodulator configured to demodulate the received signal via the communication channel;

    a demapper configured to estimate likelihoods from the demodulated signal;

    a decoder that is configured to estimate decoded bits from the likelihoods generated by the demapper;

    wherein the first symbol constellation is a capacity optimized non-uniformly spaced symbol constellation that provides a given capacity at a reduced signal-to-noise ratio compared to a signal constellation that maximizes dmin; and

    wherein the transmitter and the receiver adapt from using the first symbol constellation to a second capacity optimized non-uniformly spaced symbol constellation in response to channel conditions.

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