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Nearby Phase Search Algorithm with Reduced Complexity for Higher Order QAM Formats

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Abstract:

This paper proposes a nearby phase search (NPS) algorithm based on BPS estimation algorithm in optical coherent receivers. And its suitable for arbitrary multi-level modulation. Making use of the continuity of phase change, the proposed NPS algorithm is applied to process nearby symbols by taking the pre-estimation phase of each symbol block as reference point. Compared to the traditional blind phase search (BPS) algorithm and its improved two-stage BPS algorithm, the performance of the proposed NPS algorithm is greatly improved in ultra-high speed coherent optical transmission system. By the simulation, the effectiveness and feasibility of the proposed algorithm are demonstrated in 28GBaud 16-QAM and 64-QAM system. Its shown that the computational complexity of the NPS algorithm greatly reduces in the guarantee of laser line width tolerance and bit error rate.

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Info:

Periodical:

Advanced Materials Research (Volumes 760-762)

Pages:

1869-1873

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.760-762.1869

Citation:

Cite this paper

Online since:

September 2013

Authors:

Li Min Xia, Xian Zhou, Dong Yan, Na Na Zhang, Xiao Yun Wu

Keywords:

Blind Phase Search, Carrier Phase Estimation, Multi-Level Modulation, Optical Coherent Detection

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