基于蓝牙4.0的低功耗无线传感器网络节点设计

针对国内外一些可穿戴式智能设备的无线传感节点的设计方案,有一些是基于集成了无线传输协议的控制器,他们有数字处理能力有限,硬件系统固定,缺乏单元灵活性,特别不利于多路参数并行处理的问题,设计了一种基于蓝牙4.0的低功耗无线传感器网络节点。使用了基于蓝牙4.0技术的CC2540芯片和Xilinx公司的低功耗FPGA芯片,并结合手机应用程序完成了系统设计。并且在硬件设计和软件设计上注意降低整个系统的功耗。测试结果表明,系统在低功耗设计的基础上,可以准确的将数据通过蓝牙发送出去。该系统具有低功耗、低成本、开发难度小等特点,可适用于可穿戴式智能设备等领域。     

蓝牙技术联盟推出新一代蓝牙低功耗无线技术 开启医疗保健、健身、安全和家庭娱乐等全新市场大门

蓝牙技术联盟（Bluetooth Special Interest Group,SIG）宣布推出采用低功耗版本蓝牙核心规格4.0版本的升级版蓝牙低功耗无线技术,将为具备低成本、低功耗的无线设备带来全新的市场!此蓝牙技术的新革命运动将掀起一场前所未见、超越想象的崭新应用,     

基于蓝牙4.0的便携式低功耗TVOC传感器设计

一种基于蓝牙4.0的便携式TVOC的无线传感器,由低功耗单片机pic16f913、高精度TVOC模组以及蓝牙4.0模组组成,18650电池供电,软件上采取低功耗策略,实现了TVOC的精准采集,并可以通过智能手机查看监测值.     

智能蓝牙-低功耗连接技术革命

正智能蓝牙技术(Bluetooth Smart)又称低功耗蓝牙(BLE),是能够将低功耗装置和传感器连到智能手机、平板电脑等控制器的无线个人区域网络协议,信号传输采用2.4GHz射频通信技术。低功耗蓝牙技术的商用推广由蓝牙技术联盟负责,目标应用主攻医疗保健、运动健身、安保系统、穿戴式装置、家庭自动化等智能创新产品设备。低功耗蓝牙技术能够帮助创新者研制尺寸紧凑、电池寿命长久且能够无缝     

蓝牙4.0无线传感网数据采集及以太网传输设计

介绍了蓝牙4.0无线传感器网络及以太网传输技术,以基于蓝牙低功耗技术的CC2540射频单片机为核心,控制多种传感器来进行数据的采集,搭建星形拓扑的蓝牙无线传感器网络,并通过以太网接口将采集到的数据传输给远程的TCP服务器。实验结果表明,本系统具有体积小、功耗低、远距离传输等优点。     

基于低功耗蓝牙的智能手机车身控制系统研究

提出了一种基于低功耗蓝牙的智能手机汽车车身控制系统。在汽车车身上安装低功耗蓝牙模块,支持蓝牙4.0规范的智能手机通过相关应用程序与低功耗蓝牙模块通讯。手机控制命令通过蓝牙信号传递到车身,车身上的其他控制模块接收到控制命令后执行相应动作,并将对应的状态信息通过蓝牙信号返回给手机,显示在手机应用程序界面,使用户通过智能手机来控制汽车状态并且获取车上相关信息。对该系统进行了调试,调试结果表明,该系统信息传输稳定,界面友好,实现了手机对汽车的智能控制。     

Qualcomm Atheros最新笔记本电脑平台蓝牙技术获宏选用其石

高通公司旗下联网和连接技术子公司Qualcomm Atheros日前宣布推出适用于笔记本电脑及其他计算机设备的Bluetooth 4.0＋HS芯片解决方案。Qualcomm Atheros业内第一款Bluetooth 4.0＋HS芯片,可使笔记本电脑无线探测及连接近感探测和健康监控等低功耗蓝牙设备。     

CSR:蓝牙低功耗与室内定位前景被看好

在CSR手机业务部战略营销经理Darren Watkins看来,无线行业是发展最快的行业,其特征是不断更新和定义相关的技术与标准。他表示,2011年CSR将着重发力以下领域:1.蓝牙低功耗。作为蓝牙核心标准v4.0的一个主要     

全新蓝牙4.0版本即将问世

此规格引领蓝牙技术扩展医疗保健、运动健身、保全和家庭娱乐无线市场蓝牙技术联盟（Bluetooth SpecialInterest Group,SIG）今年于西雅图举行的全体成员大会上．正式公布即将问世蓝牙核心规格40版本的相关数据,其中包括该规格的标志优势一蓝牙低功耗技术,预计在第二季度末上市。     

Zig Bee如何应对蓝牙4.0的冲击

蓝牙4.0带着低功耗的优点强势回归,给以低功耗为傲的Zig Bee技术当前一棒。面对蓝牙4.0的来势汹汹,Zig Bee又将如何应对。文章通过对两者技术特点的对比分析简述了Zig Bee技术在某些领域对蓝牙4.0的应对以及得出了两者是一种优势互补关系的结论。     

Resolution Enhancement Technology:Integrated Process Solutions using OPC

DUV lithography, using the 248 nm wavelength, is a viable manufacturing option for devices with features at 130 nm and less. Given the low kl value of the lithography, integrated process development is a necessary method for achieving acceptable process latitude. The application of assist features for rule based OPC requires the simultaneous optimization of the mask, illumination optics and the resist.Described in this paper are the details involved in optimizing each of these aspects for line and space imaging.A reference pitch is first chosen to determine how the optics will be set. The ideal sigma setting is determined by a simple geometrically derived expression. The inner and outer machine settings are determined, in turn,with the simulation of a figure of merit. The maximum value of the response surface of this FOM occurs at the optimal sigma settings. Experimental confirmation of this is shown in the paper.Assist features are used to modify the aerial image of the more isolated images on the mask. The effect that the diffraction of the scattering bars (SBs) has on the image intensity distribution is explained. Rules for determining the size and placement of SBs are also given.Resist is optimized for use with off-axis illumination and assist features. A general explanation of the material' s effect is discussed along with the affect on the through-pitch bias. The paper culminates with the showing of the lithographic results from the fully optimized system.     

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.     

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.     

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.     

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.     

Study of waveguide coupling efficiency in hybrid silicon lasers

This paper presents a new method to increase the waveguide coupling efficiency in hybrid silicon lasers. We find that the propagation constant of the InGaAsP emitting layer can be equal to that of the Si resonant layer through improving the design size of the InP waveguide. The coupling power achieves 42% of the total power in the hybrid lasers when the thickness of the bonding layer is 100 nm. Our result is very close to 50% of the total power reported by Intel when the thickness of the thin bonding layer is less than 5 nm. Therefore, our invariable coupling power technique is simpler than Intel＇s.     

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.     

A rigorous proof of MIMO channel capacity’s increase with antenna number

It is well known that adding more antennas at the transmitter or at the receiver may offer larger channel capacity in the multiple-input multiple-output（MIMO） communication systems. In this letter, a simple proof is presented for the fact that the channel capacity increases with an increase in the number of receiving antennas. The proof is based on the famous capacity formula of Foschini and Gans with matrix theory.     

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