FPGA Implementation of Distance-Independent Symbol Timing Synchronization in IM/DD OFDM-PON

Xiaoyi Chen; Mingyi Gao; Yanping Sha; Ji Zhang; Erxi Fang; Hongliang Ren

doi:10.1109/ACCESS.2019.2956876

IEEE Access (Jan 2019)

FPGA Implementation of Distance-Independent Symbol Timing Synchronization in IM/DD OFDM-PON

Xiaoyi Chen,
Mingyi Gao,
Yanping Sha,
Ji Zhang,
Erxi Fang,
Hongliang Ren

Affiliations

Xiaoyi Chen: ORCiD; Suzhou Key Laboratory of Advanced Optical Communication Network Technology, School of Electronic and Information Engineering, Soochow University, Suzhou, China
Mingyi Gao: ORCiD; Suzhou Key Laboratory of Advanced Optical Communication Network Technology, School of Electronic and Information Engineering, Soochow University, Suzhou, China
Yanping Sha: ORCiD; Suzhou Key Laboratory of Advanced Optical Communication Network Technology, School of Electronic and Information Engineering, Soochow University, Suzhou, China
Ji Zhang: ORCiD; Suzhou Key Laboratory of Advanced Optical Communication Network Technology, School of Electronic and Information Engineering, Soochow University, Suzhou, China
Erxi Fang: ORCiD; Suzhou Key Laboratory of Advanced Optical Communication Network Technology, School of Electronic and Information Engineering, Soochow University, Suzhou, China
Hongliang Ren: ORCiD; College of Information Engineering, Zhejiang University of Technology, Hangzhou, China

DOI: https://doi.org/10.1109/ACCESS.2019.2956876
Journal volume & issue: Vol. 7
pp. 173731 – 173737

Abstract

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Intensity modulation/direct detection (IM/DD) orthogonal frequency division multiplexing (OFDM) is very suitable for high-speed cost-sensitive passive optical network (PON) applications. However, real-time OFDM systems are sensitive to synchronization bias, and thus symbol timing synchronization (STS) becomes a critical issue. We proposed a proportional-sign cross-correlation (PS-CC) STS algorithm with the advantages of distance-independence and low resource utilization. In the proposed PS-CC STS algorithm, the sign operation is applied instead of the multiplication operation with high computational complexity to decrease the resource utilization and the characteristic of low resource utilization will drive its application in real-time systems. Meanwhile, we use field programmable gate array (FPGA) to design a baseband IM/DD OFDM receiver with pipeline structure and built a universal loop test system, which is applied to implement the proposed PS-CC STS algorithm and evaluate its performance. In the experiment of a 16-QAM OFDM-PON system, a 30-km fiber transmission only results in 1.98% ripple on the peak amplitude of correlation, which verifies the distance-independence of the proposed method.

Published in IEEE Access

ISSN: 2169-3536 (Online)
Publisher: IEEE
Country of publisher: United States
LCC subjects: Technology: Electrical engineering. Electronics. Nuclear engineering
Website: https://ieeexplore.ieee.org/xpl/RecentIssue.jsp?punumber=6287639

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