Design and Application of Amplitude-Locked Loop Separation System Based on SignalWAVe

In this paper, we adopt concepts from the SignalWAVe development platform for the multi-speech signal separation system of a frequency modulation system. The signal separation system is formed using a phase-locked loop in combination with an amplitude-locked loop (ALL) and is modeled using a digital finite-impulse response (FIR) filtering algorithm. Therein, the objective is to improve the signal distortion of co-channel interferences and additive white Gaussian noise (AWGN). In comparison to a traditional separation system, the ALL is achieved in the monitored system and in signal interception applications with a characteristic analysis based on the power spectrum density. The field programmable gate array (FPGA) design platform has the advantages of flow simplicity, easy reconfiguration, and high compatibility for verification. The design system is operated in real time and is implemented in the system model using various chip designs. The FPGA is implemented system as a system on a chip for high efficiency. According to the simulated performances under an applied AWGN channel, the ALL system in combination with a digital FIR filter achieves prefect performance. The SignalWAVe verification system was also implemented on the chip by building, verifying programs, and implemented communication functions for practical application in the industry.     

针对容性压电负载的桥式功率放大电路的设计

功率放大电路负责驱动容性压电负载,是整个压电执行器的关键部件.根据某驱动电源中的功率放大电路作为设计对象,通过采用桥式电路结构,从而提高了整体性能;通过研究放大器的共模输入电压范围,从而设定了非对称电源;通过分析波形,从而设定了电压增益;通过采用过压保护和限制电流,增强了电路的安全性;通过计算热工,设置了散热方式;通过使用方波测试法,测定了电路的稳定性.实验结果显示,该方法能实现双极性输出,以至于性能上的提高胜过了成本和复杂性的增加.     

Investigation of candidate VRM topologies for futuremicroprocessors

By reducing the power supply voltage, faster, lower power consumption, and high integration density data processing systems can be achieved. The current generation high-speed complementary metal-oxide-semiconductor (CMOS) processors (e.g., Alpha, Pentium, Power PC) are operating at above 300 MHz with 2.5 to 3.3 V output range. Future processors will be designed in the 1.1-1.8 V range, to further enhance their speed-power performance. These new generation microprocessors will present very dynamic loads with high current slew rates during transient. As a result, they will require a special power supply, voltage regulator module (VRM), to provide well-regulated voltage. The VRMs should have high power densities, high efficiencies, and good transient performance. In this paper, the critical technical issues to achieve this target for future generation microprocessors are addressed. A VRM candidate topology, interleaved quasisquare-wave (QSW), is proposed. The design, simulation and experimental results are presented     

浅论邮政企业组织文化的变革

针对邮政企业的组织文化相当落后 ,迫切需要进行变革 ,分析并提出了实现邮政企业组织文化变革的若干构想     

Ⅴ/Ⅲ族气体源流量比对AlGaInP材料MOCVD外延生长的影响

用MOCVD系统外延生长AlGaInP材料时往往要通入过量的PH3来获得足够大的Ⅴ/Ⅲ族气体源流量比,以便得到高质量的晶体结构.分别采用1 000 ml/min和400 ml/min 的PH3流量(对应的Ⅴ/Ⅲ比分别为723和289),利用低压金属有机物化学气相沉积(LP-MOCVD)系统生长了AlGaInP材料,并使用MOCVD在位监测(in-situ)软件、X射线双晶衍射仪以及光荧光测试系统等对样品进行了测量分析.发现Ⅴ/Ⅲ比不但会影响AlGaInP材料的生长速度,对外延材料与衬底GaAs的晶格失配度和材料的光学特性也有影响.     

基于粒子群优化多核支持向量数据描述的广播式自动相关监视异常数据检测模型

广播式自动相关监视(ADS-B)作为新一代空中交通管理(ATM)通信协议,是未来空管监视系统的关键技术。目前,由于ADS-B采用明文格式广播发送数据,其安全性问题受到挑战。针对ADS-B易受到的欺骗干扰,该文将ADS-B位置数据和同步的二次雷达(SSR)数据作差,将两者的差值作为样本数据。利用多核支持向量数据描述(MKSVDD)训练样本,得到了超球体分类器,此超球体分类器能检测出ADS-B测试样本中的异常数据。并且,通过粒子群算法(PSO)优化了GaussLapl和GaussTanh两种MKSVDD的惩罚因子、多核核函数系数以及核参数,提高了异常数据检测性能。实验结果表明,对于随机位置偏移、固定位置偏移、拒绝服务(DOS)攻击和重放攻击,粒子群优化多核支持向量数据描述(PSO-MKSVDD)模型能检测出这4种攻击类型的异常数据。且相较于其他机器学习和深度学习方法,该模型的适应性更好,异常检测的召回率和检测率更优。证明该模型可用于ADS-B异常数据的检测。     

基于移动终端的striving时间管理系统设计与实现

文章实现一个面向在校生的基于移动终端的striving时间管理系统,用户可以通过此系统来体验诸如番茄计时、查阅并评论校内公告、学习资源云盘共享、学习圈子交互等核心功能。系统采用微信小程序原生语法开发,主体为JavaScript,页面渲染使用WXML以及WXSS,后端服务选用LeanCloud。该系统的建成将帮助用户建立良好的时间管理意识,提高学习效率。     

非跟踪体制炮位侦察雷达目标自动识别技术的实现

非跟踪体制炮位侦察雷达要实现目标的自动识别,其关键技术是背景杂波的处理和对目标信号的识别。文中提出了采用脉冲积累技术,对非相参脉冲串信号处理进行视频积累,由门限判决器判断有无目标回波、抑制噪声和杂乱脉冲干扰,降低系统的虚警率;采用杂波存储技术存储全画面杂波,建立静态杂波图,有效地抑制地物杂波的影响;采用单片机主-从系统双机速度识别技术,对回波信号进行速度识别和相关处理,实现非跟踪体制炮位侦察雷达目标自动识别。     

基于IRWLS支持向量拟合的线谱检测算法

基于迭代最小二乘支持向量拟合（IRWLS—SVR）法,建立了舰船噪声中线谱信号的数学模型用于对噪声背景中线谱信号的检测;利用IRWLS—SVR算法得到的稀疏解,减少了运算量,提高了运算速度。利用计算机仿真信号和实测舰船声信号的验证表明,该算法在高斯噪声背景下可以有效地检测出线谱信号,检测舰船噪声信号中线谱信号的信噪比改善达到4dB。     

10GEPON关键技术及产业发展现状

EPON/GPON已经成为十分成熟的技术,广泛应用于各运营商现网建设和工程改造。但是,随着今后对网络高速化、扁平化要求的进一步提高,10GEPON能提供更多用户接入、更高带宽保障,受到业界的广泛关注,成为FTTX技术发展的新方向。本文主要论述10GEPON技术的整体架构、技术优势、产业链发展现状以及现有PON网络向10G速率提升的可行性方案。