Joint timing and frequency synchronization based on weighted CAZAC sequences for reduced-guard-interval CO-OFDM systems

被引：16
|
作者：
Omomukuyo, Oluyemi [1 ]
Chang, Deyuan [1 ]
Zhu, Jingwen [1 ]
Dobre, Octavia [1 ]
Venkatesan, Ramachandran [1 ]
Ngatched, Telex [2 ]
Rumbolt, Chuck [3 ]
机构：
[1] Mem Univ Newfoundland, Fac Engn & Appl Sci, St John, NF A1B 3X5, Canada
[2] Mem Univ, Div Sci, Corner Brook, NF A2H 5G4, Canada
[3] Altera Newfoundland Technol Ctr, Mt Pearl, NF A1N 4S9, Canada
来源：
OPTICS EXPRESS | 2015年 / 23卷 / 05期
关键词：
COHERENT OPTICAL OFDM; OFFSET ESTIMATION; PHASE NOISE; TRANSMISSION; COMPENSATION; EQUALIZATION; SCHEME;
D O I：
10.1364/OE.23.005777
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
A novel joint symbol timing and carrier frequency offset (CFO) estimation algorithm is proposed for reduced-guard-interval coherent optical orthogonal frequency-division multiplexing (RGI-CO-OFDM) systems. The proposed algorithm is based on a constant amplitude zero autocorrelation (CAZAC) sequence weighted by a pseudo-random noise (PN) sequence. The symbol timing is accomplished by using only one training symbol of two identical halves, with the weighting applied to the second half. The special structure of the training symbol is also utilized in estimating the CFO. The performance of the proposed algorithm is demonstrated by means of numerical simulations in a 115.8-Gb/s 16-QAM RGI-CO-OFDM system. (C) 2015 Optical Society of America
引用
收藏
页码：5777 / 5788
页数：12
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