SFO compensation by pilot-aided channel estimation for real-time DDO-OFDM system
SFO compensation by pilot-aided channel estimation for real-time DDO-OFDM system
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DOI：
10.1016/j.optcom.2015.06.046
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发表时间：
2015-11
影响因子：
2.4
通讯作者：
Rui Deng;Jing He;Ming Chen;Lin Chen
中科院分区：
文献类型：
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作者：
Rui Deng;Jing He;Ming Chen;Lin Chen
在本文中，我们实验证明了一个导频辅助和线性插值信道估计技术的实时直接检测光正交频分复用（DDO-OFDM）系统中使用的成本效益的直接调制激光器（DML）。仿真结果表明，基于导频的线性内插信道估计技术可以有效地补偿采样频率偏移的影响。实验结果表明，基于导频辅助和线性内插信道估计技术，即使在170 ppm的SFO下，在硬判决前向纠错（HD-FEC）阈值下，16-QAM-OFDM信号也可以在100 km的SSMF上成功传输，误码率为3.8×10−3。高达~25 ppm的SFO的影响可以忽略不计。
In this paper, we experimentally demonstrated a pilot-aided and linear interpolated channel estimation technique in the real-time direct-detection optical orthogonal frequency division multiplexing (DDO-OFDM) system using a cost-effective directly modulated laser (DML). It has been verified that the pilot-aided and linear interpolated channel estimation technique can help to compensate the sampling frequency offset (SFO) effect. The experimental results show that, based on the pilot-aided and linear interpolated channel estimation technique, even at a SFO of 170 ppm, a 16-QAM-OFDM signal can be successfully transmitted over 100-km SSMF under the hard-decision forward-error-correction (HD-FEC) threshold with a bit error rate of 3.8×10−3. And the effect of up to ~25 ppm SFO can be negligible.