美国无线电干扰监管机制概况

美国无线电干扰监管系统的建设工作起步很早,发展到今天已形成了一套完整的、成熟的无线电干扰监管机制.联邦通信委员会(FCC)和国家电信和信息管理局(NTIA)是美国主要的两个无线电监管机构,它们从不同方面承担起美国的无线电平扰监管工作,本文将分别进行介绍.     

下一代无线电技术与广播电视发展的探讨

本文叙述了下一代无线电技术对广播电视技术发展的影响。空时无线电、感知无线电、IPCN、无线电资源管理将成为下一代无线电发展的主要方向,以完成无线电资源的挖掘和更有效的配置,实现技术系统和业务系统的贯通与整合。广播电视将作为顶层业务和技术系统出现在下一代无线电中。     

下一代无线电技术与广播电视发展的探讨

本文叙述了下一代无线电技术对广播电视技术发展的影响。空时无线电、感知无线电、IPCN、无线电资源管理将成为下一代无线电发展的主要方向。以完成无线电资源的挖掘和更有效的配置,实现技术系统和业务系统的贯通和整合。广播电视将作为顶层业务和技术系统出现在下一代无线电中。     

新型的无线电遥控环幕升降系统

本文介绍了一种最近研制而成的新型的无线电遥控环幕升降系统,简要论述利用现有无线电收发模块来实现无线电遥控环幕升降的基本原理以及人工按钮和无线电遥控两种控制方式合二为一的工程制作方法。为同类产品在其它领域中的应用设计和工程实现提供了一定的参考价值。     

无线区域网和认知无线电技术(2)

802．22工作组的主要任务是开发和建立一套基于认知无线电（CR）技术，在现有电视频段利用暂时空闲的频道进行无线通信的区域网空中接口标准。由于基于802．22协议的无线区域网（WRAN）工作在现有电视频段中，要求不能对正在广播的电视频道产生干扰，所以WRAN采用了认知无线电技术，对电视频段进行感知和测量，利用动态频谱管理技术找到空闲频道进行再分配。认知无线电技术将是未来无线通信的发展方向之一。本讲座将分3期对无线区域网和认知无线电技术进行介绍，第1讲介绍无线区域网络和IEEE802．22工作组情况，包括WRAN背景、802．22系统、802．22空中接口等；第2讲介绍认知无线电技术和实现其的基础软件无线电（SDR）技术，包括无线电知识描述语言（RKRL）和认知循环、无线电频谱礼仪等；第3讲介绍802．22WRAN频谱共存问题和认知无线电技术的应用。[编者按]     

无线区域网和认知无线电技术

802.22工作组的主要任务是开发和建立一套基于认知无线电（CR）技术。在现有电视频段利用暂时空闲的频道进行无线通信的区域网空中接口标准。由于基于802.22协议的无线区域网（WRAN）工作在现有电视频段中，要求不能对正在广播的电视频道产生干扰，所以WRAN采用了认知无线电技术，对电视频段进行感知和测量。利用动态频谱管理技术找到空闲频道进行再分配。认知无线电技术将是未来无线通信的发展方向之一。本讲座分3期对无线区域网和认知无线电技术进行介绍，第1讲已经介绍无线区域网络和IEEE802．22工作组情况，包括WRAN背景、802.22系统、802．22空中接口等；第2讲已经介绍认知无线电技术和实现其的基础软件无线电（SDR）技术，包括无线电知识描述语言（RKRL）和认知循环、无线电频谱礼仪等；本讲介绍802．22WRAN频谱共存问题和认知无线电技术的应用。[编者按]     

基于深度学习与软件无线电的盲解调系统研究

盲解调系统能够在未知调制方式的条件下完成信号解调，在认知无线电、电子对抗等领域具有重要的应用价值。现有的盲解调系统，大多调制方式识别精度低，容易产生解调错误，且受硬件平台限制，拓展性较差。本文设计并实现了一套基于深度学习和软件无线电的盲解调系统。该系统利用最新的深度学习算法替代传统的基于特征的算法，用于提高调制方式识别精度；同时，还采用软件无线电平台替代传统的硬件电路，便于系统功能的升级和扩充。测试结果表明，本文实现的系统达到了设计需求，在各种场景下均能正确解调信号，且能够对调制方式的改变及时作出反应。      

基于OAI的LTE通信平台的研究与实现

文章首先介绍基于SDR(Software Defined Radio,软件定义无线电)实现的LTE开源无线通信系统—OAI(Open AirInterface的简称),重点分析OAI的软硬件平台以及OAI连接流程,通过OAIUE OAIeNB+OAI EPC/HSS实验调试与分析,采用FDD-LTE制式,实现了从EPS到eNodeB的S1接口的互连,再通过真实无线环境到UE的上下行通信。相对于其它仿真实验,可为研究LTE和相关科研教学工作人员提供一个更加符合真实应用场景的实验平台。     

基于无源时差定位技术的无线电监测系统研究与设计

在研究现有无线电监测系统的基础上,指出了系统存在的不足,设计了一种基于无源时差定位技术的无线电监测系统。给出了系统的总体的设计方案;分析了系统的核心子系统和主要组成单元的工作原理;最后总结了本系统的定位工作流程。本系统的设计对于工程实现有一定的指导意义。     

浅谈我国无线电管理机构的办公自动化系统

0前言 办公自动化系统可以帮助各省实现无线电管理工作中的无纸化办公,提高工作效率,推动全国无线电管理工作的信息化进程,作为全国无线电管理信息系统推广的应用系统之一,我国从2000年下半年开始实施国家无线电管理机构和各省无线电管理机构的网络互联.采用的办公自动化系统由京华计算机网络系统公司出品,京华ExOA2000办公自动化系统是该公司于1998年12月成功发布的具有独特的跨平台技术的办公自动化系统,融汇了京华计算机网络系统公司首创的自定义思想和各种新技术,是国内第一套可以跨平台运行的办公自动化软件.它功能强大、灵活,能够满足用户的各种办公要求,全面实现各类办公应用.     

Cost-effective test solutions for smart card and other integrated flash applications

From its emergence in the late 1980s as a lower cost alternative to early EEPROM technologies, flash memory has evolved to higher densities and speedsand rapidly growing acceptance in mobile applications.In the process, flash memory devices have placed increased test requirements on manufacturers. Today, as flash device test grows in importance in China, manufacturers face growing pressure for reduced cost-oftest, increased throughput and greater return on investment for test equipment. At the same time, the move to integrated flash packages for contactless smart card applications adds a significant further challenge to manufacturers seeking rapid, low-cost test.     

An improved parallel thinning algorithm with two subiterations

The parallel thinning algorithm with two subiterations is improved in this paper. By analyzing the notions of connected components and passes, a conclusion is drawn that the number of passes and the number of eight-connected components are equal. Then the expression of the number of eight-connected components is obtained which replaces the old one in the algorithm. And a reserving condition is proposed by experiments, which alleviates the excess deletion where a diagonal line and a beeline intersect. The experimental results demonstrate that the thinned curve is almost located in the middle of the original curve connectivelv with single pixel width and the processing speed is high.     

Theoretical analysis of the relationship between the Brillouin gain coefficient and the strain in the optical-fiber sensors

The relation between the power of the Brillouin signal and the strain is one of the bases of the distributed fiber sensors of temperature and strain. The coefficient of the Bfillouin gain can be changed by the temperature and the strain that will affect the power of the Brillouin scattering. The relation between the change of the Brillouin gain coefficient and the strain is thought to be linear by many researchers. However, it is not always linear based on the theoretical analysis and numerical simulation. Therefore, errors will be caused if the relation between the change of the Brillouin gain coefficient and the strain is regarded as to be linear approximately for measuring the temperature and the strain. For this reason, the influence of the parameters on the Brillouin gain coefficient is proposed through theoretical analysis and numerical simulation.     

Novel fiber-optical interferometer with miniaturized probe for in-hole measurements

Today, micro-system technology and the development of new MEMS （Micro-Electro-Mechanical Systems） are emerging rapidly. In order for this development to become a success in the long run, measurement systems have to ensure product quality. Most often, MEMS have to be tested by means of functionality or destructive tests. One reason for this is that there are no suitable systems or sensing probes available which can be used for the measurement of quasi inaccessible features like small holes or cavities. We present a measurement system that could be used for these kinds of measurements. The system combines a fiber optical, miniaturized sensing probe with low-coherence interferometry, so that absolute distance measurements with nanometer accuracy are possible.     

Teleportation of an arbitrary unknown N-qubit entangled state under the controlling of M controllers

A new quantum protocol to teleport an arbitrary unknown N-qubit entangled state from a sender to a fixed receiver under M controllers(M < N) is proposed. The quantum resources required are M non-maximally entangled Greenberger-Home-Zeilinger (GHZ) state and N-M non-maximally entangled Einstein-Podolsky-Rosen (EPR) pairs. The sender performs N generalized Bell-state measurements on the 2N particles. Controllers take M single-particle measurement along x-axis, and the receiver needs to introduce one auxiliary two-level particle to extract quantum information probabilistically with the fidelity unit if controllers cooperate with it.     

Diode-end-pumped Nd:YVO4/LBO lasers with 4.2W continuous-wave output at 457 nm

A continuous-wave (CW) 457 nm blue laser operating at the power of 4.2 W is demonstrated by using a fiber coupled laser diode module pumped Nd: YVO4 and using LBO as the intra-cavity SHG crystal With the optimization of laser cavity and crystal parameters, the laser operates at a very high efficiency. When the pumping power is about 31 W, the output at 457nm reaches 4.2 W, and the optical to optical conversion efficiency is about 13.5% accordingly. The stability of the out putpower is better than 1.2% for 8 h continuously working.     

Call for Papers

正Wireless Body-area Networks The last decade has witnessed the convergence of three giant worlds:electronics,computer science and telecommunications.The next decade should follow this convergence in most of our activities with the generalization of sensor networks.In particular with the progress in medicine,people live longer and the aging of population will push the development of wireless personal networks     

Call for Papers—Feature Topic,Vol.12,No.7,2015

正Information Centric Networking Information-Centric Networking(ICN) is an emerging direction in Future Internet architecture research,gaining significant tractions among academia and industry.Aiming to replace the conventional host-to-host communication model by a data-centric model,ICN treats data content as the first     

JOURNAL OF ELECTRONICS(CHINA)

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NEXT GENERATION WIRELESS NETWORKS–ESPECIALLY THE USE OF MILLI-MICROWAVE BANDS

The global bandwidth shortage of wireless communications has motivated the exploration of the naillimeter wave （ram-wave） frequency spectrum for the next generation wireless communications. Recent advances in RF CMOS technology and high speed baseband signal processing technologies have enabled tile extensive research and development of turn-wave wireless communications. The multi gigabit per second data rate of ram-wave system will lead to applications in many important scenarios, such as WPAN, WLAN,back-haul for cellular system. And the frequency bands include 28 GHz, 38 GHz, 45GHz, 60GHz, E-BAND and even beyond 100 GHz. The propagation and the imitation of the RF circuits design in these frequency bands make the directional antennas be inevitable for mm-wave communications.