ID 原文 译文
24565 采用DCASE-2017和LITIS-Rouen数据集作为实验数据，比较不同特征与聚类方法的性能。 Two datasets, DCASE-2017 and LITIS-Rouen, are used as experimental data, and the performance of different features and clustering methods are compared.
24566 实验结果表明：采用归一化互信息和聚类精度作为评价指标时，基于联合学习框架提取的深度变换特征优于其他特征，本文方法优于其他方法。 Experimental results show that the DTF extracted by the joint learning framework outperforms other features, and our method is superior to other methods, in terms of the metrics of both normalized mutual information and clustering accuracy.
24567 本文方法所需要付出的代价是需要较大的计算复杂度。 The cost of the proposed method is the higher computational complexity.
24568 非线性失真是影响光载无线通信链路无杂散动态范围和工作带宽的主要因素。 Nonlinear distortion is identified as a major factor affecting the operating bandwidth and spurious-free dynamic range (SFDR) of radio-over-fiber link.
24569 通过结合射频功率比、偏振复用和偏置控制技术，针对分布式天线系统，构建了一种大动态范围和跨倍频程带宽多通道光载无线通信链路。 Combining with the RF power ratio, polarization multiplexing and bias control techniques, a multi-channel radio-over-fiber link with high dynamic range and octave-spanning bandwidth is constructed for distributed antenna system (DAS).
24570 利用拉格朗日乘子法对所提链路进行线性度优化建模，得到了射频输出功率、偏振入射角和射频功率比之间的最佳折衷，从而在抑制三阶交调失真和二阶谐波失真的基础上，实现了链路线性度的最优化。 A model of linearity optimization for the proposed link is developed using a Lagrange multiplier method optimization model, and the best trade-off among RF output power, polarization incident angle and RF power ratio can be obtained. Thus, the optimization of link linearity can be achieved on the premise that the third-order intermodulation distortion (IMD3) and second-order harmonic distortion (HD2) are suppressed simultaneously.
24571 仿真和实验结果验证了所提方案的有效性和可行性。 The simulated and experimental results show the proposed scheme is effective and feasible.
24572 论文基于涡旋光束传输特性及光散射理论，研究了叠加态涡旋光束经旋转随机粗糙表面的场分布及干涉特性。 Based on the transmission characteristics of vortex beams and light scattering theory, the field distribution and interference characteristics of superposition vortex beams passing through the rotating random rough surface are studied.
24573 对拓扑荷值大小相同、符号相反的两束涡旋光进行了叠加生成仿真及实验，利用角谱衍射理论，分析了旋转随机粗糙表面均方根粗糙度对光束传输的影响，数值计算了不同拓扑荷值的叠加态涡旋光束经旋转随机粗糙表面后，与参考光进行干涉得到不同转速下归一化强度值随时间变化的曲线，并通过光强-时间函数间接求得频移量,再反演得到旋转目标的转速。 Two vortex beams with the same topological charge value and opposite signs are used for simulation and experiment of superimposition generation. Using angular spectrum diffraction theory, the influence of the root-mean-square roughness of the rotating random rough surface on the beam transmission is analyzed. As the superposition vortex beams with different topological charges pass through the rotating random rough surface and interfere with the reference light, the time-dependent curve of normalized intensity values at different rotational speeds can be obtained through numerical calculation. Then the frequency shift can be indirectly obtained by light intensity-time function and the speed of rotating target can be obtained through inversion.
24574 结果表明：通过仿真曲线的周期反演频率，当转速 Ω 分别为 2π/3 rad/s，2π rad/s，10π/3 rad/s 时，对应的频移Δf分别为2/3Hz，2Hz，10/3Hz。 The results show that: the frequency is inverted by the period of the simulation curve, and when the rotational speed Ω is 2π/3 rad/s, 2π rad/s, 10π/3 rad/s, the corresponding frequency shift Δf is 2/3Hz, 2Hz, 10/3Hz, respectively.