LTE 频点和频率换算工具V1.0，用于频点和频率之间的相互换算，支持3GPP TS 36.101 V14.1.0(2016-09)

针对单负载，垂直变形引起的传统MEMS（微机电系统）谐振器窄带和谐振频率固定的问题，提出了一种新型的具有超宽带，可调谐频率和基于垂直方向两级调节特性的MEMS谐振器。和水平负载。 建立了水平和垂直负载双级调节谐振器的微分方程，推导了两端锚定的谐振器的频率方程。 提出的谐振器的中心频率为17.7 MHz，两级范围分别为395480 ppm和16 ppm。

针对低信噪比下电子侦察机接收到的多分量信号的盲检测问题,提出了一种基于特征值能量的盲信号检测算法。该算法首先计算归一化特征值,然后进行信号子空间维数估计,构建检验统计量表达式,进而研究了扰动分布,从而确定给定虚警概率下的检测门限,实现信号的盲检测。理论分析和仿真结果表明,该算法对多分量信号尤其是时频重叠的多分量信号适应性强,和现有的利用特征值分析的盲检测算法相比,性能可以提高2dB。

This paper firstly, to the best of our knowledge, proposed two-dimensional (2D) encryption based on the Arnold transformation for implementing a secure DC-biased optical orthogonal time-frequency multiplexing (DCO-OTFM) in optical-wireless communications (OWCs). The encrypted data is transformed to the particular 2D matrix and decrypted by the only key to get the correct information. Meanwhile, the number of keys in 2D encryption is enormous, which prevents eavesdroppers from exhaustively search

A passively Q-switched side-pumped laser with folded resonator is specially constructed for singlelongitudinal-mode smooth pulse output. Nd:YAG is chosen as the laser active medium and Cr⁴⁺:YAG as the saturable absorber medium. Additionally, the method of frequency selection by grating with 1200 line/mm and Fabry-Perot (F-P) etalon is used in the twisted-mode cavity. The single-frequency smooth pulses are produced with 10-Hz repetition rate, 20-ns pulse width, and 1.064-\m

We report an all-fiber high power, single frequency large-mode area (LMA) linearly polarized ytterbiumdoped fiber amplifiers (YDFA) module, which is based on the master oscillator multi-stage power amplifiers (MOPA). The maximum output power is 43.8 W at a wavelength of 1064 nm when 60-W launched pump light is coupled, with high slope efficiency of 88%, polarization extinction rate (PER) >17.2 dB and nearly diffraction-limited beam quality (M2<1.1).

A scheme for the photonic generation of frequency-tunable millimeter wave and terahertz wave signals based on a highly flat optical frequency comb is proposed and demonstrated experimentally. The frequency comb is generated using two cascaded phase modulators (PMs) and an electro-absorption modulato

In this Letter, we focus on the theoretical analysis of the relativistic energy and angular distributions of the ejected photoelectrons during the relativistic tunnel ionization of atoms by intense, circularly polarized light. We make a small modification of the general analytical expressions for these distributions. The role of the initial momentum, the ponderomotive potential, and the Stark shift are considered. We also present the maximal angle of electron emission.

针对UMA-RFID协议的安全漏洞,提出一个改进的超轻量级的RFID认证协议。通过修改UMA-RFID协议的交互方式,避免泄露标签标识符,保证读写器应答消息的新鲜性。该协议仅使用异或操作和移位操作,降低了对标签计算能力和存储能力的要求。分析结果表明,该协议可有效抵抗假冒攻击和重传攻击,适合于较低成本的RFID系统。

In visible light communication, orthogonal frequency division multiplexing (OFDM) is an effective approach to improve the system speed. However, the nonlinearity of the light-emitting diode (LED) suppresses the transmission performance. The low-frequency part of the transmitted signal from LED suffe