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Probabilistically shaped orthogonal frequency division multiplexing

  • US 10,236,991 B2
  • Filed: 03/02/2018
  • Issued: 03/19/2019
  • Est. Priority Date: 03/10/2017
  • Status: Active Grant
First Claim
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1. A method of optical communication, implemented at a transmitter in an optical communication network, comprising:

  • mapping input data to complex symbols using a probabilistic shaped quadrature amplitude modulation (PS-QAM) scheme;

    converting the complex symbols from serial data to parallel data to obtain parallel complex symbols;

    generating an OFDM signal from the parallel complex symbols, wherein the OFDM signal is a Discrete Fourier Transform-Spread (DFT-S) OFDM signal, and wherein the generating of the OFDM signal from the parallel complex symbols includes;

    performing an L-point Fast Fourier Transform (FFT) on the parallel complex symbols to obtain an L-point DFT-S signal, andperforming an N-point Inverse Fast Fourier Transform (IFFT) on the L-point DFT-S signal to obtain the DFT-S OFDM signal, wherein N is equals to a number of subcarriers of the DFT-S OFDM signal and wherein N and L are integers;

    adding a cyclic prefix to the OFDM signal;

    converting the OFDM signal with the cyclic prefix from parallel data to serial data to obtain a serial OFDM signal;

    generating a real-value OFDM signal from the serial OFDM signal; and

    transmitting the real-value OFDM signal.

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