Inter-Symbol Differential Detection-Enabled Sampling Frequency Offset Compensation for DDO-OFDM
Inter-Symbol Differential Detection-Enabled Sampling Frequency Offset Compensation for DDO-OFDM
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DOI：
10.1109/lpt.2018.2877723
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发表时间：
2018-12
影响因子：
2.6
通讯作者：
Ming Chen;Gang Liu;Hui Zhou;Qinghui Chen;Jing He
中科院分区：
文献类型：
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作者：
Ming Chen;Gang Liu;Hui Zhou;Qinghui Chen;Jing He
由于采样频率偏移（SFO）引起的码间干扰、信道间干扰和相位旋转，数模转换器和模数转换器之间的采样频率偏移（SFO）会严重影响异步直接检测光OFDM（DDO-OFDM）接收机的性能。在这封信中，一个简单的和无开销的SFO补偿方案，使符号间差分检测（ISDD）的建议和实验证明，在短距离和低成本的直接调制的激光为基础的DDO-OFDM系统的最佳快速傅里叶变换的大小。实验结果表明，SFO高达±200 ppm可以补偿可接受的误差矢量幅度（EVM）的罚款后，20公里的标准单模光纤传输。此外，当SFO较大时，在ISDD之后使用判决辅助的残余相位补偿方法可以进一步提高EVM的性能。
Sampling frequency offset (SFO) between digital-to-analog converters and analog-to-digital converters will seriously degrade the receiver performance of the asynchronous direct-detection optical OFDM (DDO-OFDM), due to the SFO-induced inter-symbol interference, inter-channel interference, and phase rotation. In this letter, a simple and overhead-free SFO compensation scheme enabled by inter-symbol differential detection (ISDD) is proposed and experimentally demonstrated in a short-reach and low-cost directly modulated laser-based DDO-OFDM system with an optimal fast Fourier transform size. The experimental results exhibit that the SFO up to ±200 ppm can be compensated with acceptable error vector magnitude (EVM) penalties after 20-km standard single-mode fiber transmission. Moreover, the EVM performance can be further enhanced by using a decision-aided residual phase compensation method after ISDD when SFO is large.