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Demonstration of Baud-Rate-Variable and Channel- Spacing-Tunable Demultiplexing of 10-40-Gbaud OFDM Subcarriers using a Multi-Tap Optical DFT
Fiber optics links subsystems Nonlinear wave mixing
2015/5/25
We experimentally demonstrate a tunable and reconfigurable optical DFT to demodulate 10-40-Gbuad OFDM with 2/3/4 subcarriers at 20/40GHz frequency spacing. Average power penalty of ~7 dB at BER of 10 ...
玉米品种近红外光谱的DFT特征分析方法
近红外光谱 玉米种子 离散傅里叶变换
2011/5/12
提出了一种基于离散傅里叶变换(discrete Fourier transform，DFT)的玉米品种特征分析新方法。实验数据为37个玉米品种种子的近红外漫反射光谱数据，波段范围为4 000～12 000 cm-1。文中通过对原始数据进行分析，发现扫描频率较高的部分噪声也比较大。文中首先定义了一种类间、类内差异度Qm的计算方法，以度量特征选择的有效性;然后利用Qm对原始数据和DFT变换后的数据进行...
We consider application of the discrete Fourier transform-spread orthogonal frequency-division multiplexing (DFT-spread OFDM) technique to high-speed fiber optic communications. The DFT-spread OFDM is...