| 李莹,张帅,王维超.基于DFT的信道估计算法在CO-OFDM系统中研究[J].光电子激光,2018,29(12):1286~1291 |
| 基于DFT的信道估计算法在CO-OFDM系统中研究 |
| An improved channel estimation based on DFT algorithm for coherent optical OFDM system |
| 投稿时间：2018-04-24 |
| DOI： |
| 中文关键词: CO-OFDM 信道估计 最小二乘 离散傅里叶变换 |
| 英文关键词:coherent optical OFDM (co-OFDM) channel estimation least square discrete Fou rier transformation |
| 基金项目:山东省技术创新项目(201320201024)和潍坊市科技发展项目(2017GX102)资助项目 (1.潍坊工程职业学院 信息工程系,山东 青州 262500； 2.东南大学 信息科学 与工程学 院,江苏,南京 210018; 3.山东大学 信息科学与工程学院,250100) |
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| 中文摘要: |
| 信道估计作为相干光OFDM(CO-OFDM)系统的一种 关键技术对系统的性能有着十分重要的影响, 光纤通信系统通过信道估计,可以将信号经过光纤传输后的影响,如损耗、色散、非线性等 ,通过在发送 端发送已知数据,在接收端利用均衡等恢复出原始信号。本文首先介绍了相干光OFDM系统, 并使用 optisystem和matlab软件搭建了相干光OFDM系统仿真平台,提出了适用于相干光OFDM系统 的基于DFT 算法及其进一步的改进算法,并在此平台上进行了仿真试验。结果表明,基于DFT算法及其 改进算法能够 很好地提高相干光OFDM系统的传输性能,改进的DFT算法与DFT算法在BER的值 为10－4的条件下,有1dB的光信噪比增益；与LS算法比较, 有3dB的光信噪比增益。 |
| 英文摘要: |
| In coherent optical orthogonal frequency division multiplexing (OFDM) communicat ion system,when the transmission rate of a signal reaches 100Gbit/s or higher,the influence of the channel beco mes a major limiting factor affecting system performance.At this time,the system is very sensitive to channel factor s,which requires an effective method to accurately track channel changes.Through the channel estimation,the p hysical effects of optical fiber, such as chromaticity dispersion and nonlinearity,can be obtained at the receiver through the transmitted known data at the transmitter,and then through the equilibrium to restore the original signal.Th is paper first introduces the coherent optical OFDM system,then builds a coherent optical OFDM system simulation platfo rm.On this platform, a DFT based and improved algorithm is applised to the coherent optical OFDM syst em for channel estimation.The results show that this algorithm can improve the performance of coherent optical OFDM transmission system,and has 1dB optical signal-to-noise ratio (OSNR) gain compared with the DFT algorithm at th e bit error rate of 10－4,and has 3dB OSNR gain compared with algorithm. |
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