Low-complexity carrier phase recovery based on principal component analysis for square-QAM modulation formats

Júlio César Medeiros Diniz, Qirui Fan*, Stenio Magalhaes Ranzini, Faisal Nadeem Khan, Francesco Da Ros, Darko Zibar, Alan Pak Tao Lau

*Corresponding author for this work

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Abstract

We propose, numerically analyze and experimentally demonstrate a low-complexity, modulation-order independent, non-data-aided (NDA), feed-forward carrier phase recovery (CPR) algorithm. The proposed algorithm enables synchronous decoding of arbitrary square-quadrature amplitude modulation (QAM) constellations and it is suitable for a realistic hardware implementation based on block-wise parallel processing. The proposed method is based on principal component analysis (PCA) and it outperforms the well-known and widely used blind phase search (BPS) algorithm at low signal-to-noise ratio (SNR) values, showing much lower cycle slip rate (CSR) both numerically and experimentally. For operation at higher SNR values, a hybrid two-stage implementation combining the proposed method and BPS is also proposed and their performance are investigated benchmarking them against the two-stage BPS (2S-BPS). The complexity of the proposed simple and hybrid methods are evaluated against 2S-BPS and computational complexity savings of 92% and 40% are expected for the simple and hybrid methods, respectively.
Original languageEnglish
JournalOptics Express
Volume27
Issue number11
Pages (from-to)15617-15626
ISSN1094-4087
DOIs
Publication statusPublished - 2019

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