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In this letter, we analyze three different carrier phase estimation approaches for coherent optical systems based on multi-subcarrier modulation, comparing them in terms of both performance and complexity. Averaging the estimated values on the subcarriers (SCs) significantly increases the laser linewidth tolerance at the expense of additional complexity, while using a single SC for carrier phase estimation...
A detailed analysis of different CPE schemes for 256- QAM signals is presented. Viterbi&Viterbi algorithms demonstrate very poor performance, while the best compromise between complexity and performance is achieved using the BPS+MLE algorithm.
A detailed simulative and experimental analysis of different CPE schemes for 64-QAM systems is presented. The best compromise between linewidth tolerance and complexity is achieved using a recently proposed multi-stage architecture, based on a modification of the standard V&V algorithm.
A detailed analysis of a novel low-complexity two-stage digital feed-forward carrier recovery algorithm for 64-QAM, based on the rotation of constellation points to remove phase modulation is presented. Its performance and complexity is compared with previously proposed algorithms.
Recent results indicate that high-complexity MLSE processors could recover large amounts of chromatic dispersion. We propose a new branch metric that minimizes complexity while preserving very good performance.
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