Blind frequency offset estimation based on cyclic prefix and virtual subcarriers in CO-OFDM system
Blind frequency offset estimation based on cyclic prefix and virtual subcarriers in CO-OFDM system
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DOI：
10.3788/col20100809.0888
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发表时间：
2010-09
影响因子：
3.5
通讯作者：
Yaojun Qiao;Zhansheng Wang;Yuefeng Ji
中科院分区：
文献类型：
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作者：
Yaojun Qiao;Zhansheng Wang;Yuefeng Ji
针对相干光正交频分复用（CO-OFDM）系统，提出了一种基于循环前缀和虚拟子载波的盲频偏估计方法。该算法能够同时估计频偏的小数部分和整数部分。其估计范围约为[？3.5 GHz，3.5 GHz]。综合分析了COOFDM系统中整数频偏的影响。分别研究了它在加性白色高斯噪声（AWGN）信道和色散信道中的性能。仿真结果表明，即使在色散信道中，当光信噪比（OSNR）较低时，它仍然可以很好地工作。
A new blind frequency offset estimation method based on cyclic prefix and virtual subcarriers in coherent optical orthogonal frequency division multiplexing (CO-OFDM) system is presented. It is able to estimate the fractional part and integral part of frequency offset at the same time. Its estimation range is about [?3.5 GHz, 3.5 GHz]. The influence of the integral frequency offset is comprehensively analyzed in COOFDM system. Its performances in the additive white Gaussian noise (AWGN) channel and the dispersive channel are investigated, respectively. Simulation results indicate that even in the dispersive channel, when the optical signal-to-noise ratio (OSNR) is low, it can still work very well.