A MODULATOR FOR GENERATING AN ASYMMETRICALLY CLIPPED OPTICAL, ACO, ORTHOGONAL FREQUENCY DIVISION MULTIPLEXING, OFDM, SIGNAL AS WELL AS A CORRESPONDING DEMODULATOR
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United States of America Patent
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Aug 11, 2022
app pub date -
Jul 6, 2020
filing date -
Jul 11, 2019
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Abstract
A modulator and demodulator for generating an Asymmetrically Clipped Optical, ACO, Orthogonal Frequency Division Multiplexing, OFDM, signal for use in data communication based on a data stream comprising input data symbols. said modulator comprising: an OFDM time signal generator block arranged for generating a time domain OFDM signal based on said input data symbols, a copy-and-flip block arranged for copying and flipping said time domain OFDM signal and appending said copied and flipped real-valued time domain OFDM signal to said time domain signal thereby obtaining a full time domain ACO-OFDM signal. The demodulator follows an inverse approach wherein an un-flip and merge block un-flips a second half of said ACO OFDM signal and merges the un-flipped second half of said ACO OFDM signal with a of said ACO OFDM signal, thereby obtaining a time domain ACO OFDM signal which is they used to retrieve the input data symbols.
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