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Photonics 2017, 4(2), 37; doi:10.3390/photonics4020037

Blind Phase Search with Angular Quantization Noise Mitigation for Efficient Carrier Phase Recovery

1
Networking and Transmission Laboratory, RISE Acreo AB, SE-164 40 Kista, Sweden
2
School of Engineering Sciences, KTH Royal Institute of Technology, SE-100 44, Stockholm, Sweden
*
Author to whom correspondence should be addressed.
Received: 19 April 2017 / Revised: 8 May 2017 / Accepted: 18 May 2017 / Published: 23 May 2017
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Abstract

The inherent discrete phase search nature of the conventional blind phase search (C-BPS) algorithm is found to introduce angular quantization noise in its phase noise estimator. The angular quantization noise found in the C-BPS is shown to limit its achievable performance and its potential low complexity implementation. A novel filtered BPS algorithm (F-BPS) is proposed and demonstrated to mitigate this quantization noise by performing a low pass filter operation on the C-BPS phase noise estimator. The improved performance of the proposed F-BPS algorithm makes it possible to significantly reduce the number of necessary test phases to achieve the C-BPS performance, thereby allowing for a drastic reduction of its practical implementation complexity. The proposed F-BPS scheme performance is evaluated on a 28-Gbaud 16QAM and 64QAM both in simulations and experimentally. Results confirm a substantial improvement of the performance along with a significant reduction of its potential implementation complexity compared to that of the C-BPS. View Full-Text
Keywords: blind phase search (BPS); carrier phase estimation (CPE); carrier phase recovery (CPR); coherent detection; quadrature amplitude modulation (mQAM); phase noise blind phase search (BPS); carrier phase estimation (CPE); carrier phase recovery (CPR); coherent detection; quadrature amplitude modulation (mQAM); phase noise
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Rodrigo Navarro, J.; Kakkar, A.; Schatz, R.; Pang, X.; Ozolins, O.; Udalcovs, A.; Popov, S.; Jacobsen, G. Blind Phase Search with Angular Quantization Noise Mitigation for Efficient Carrier Phase Recovery. Photonics 2017, 4, 37.

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