一个新颖的用于CT0标准的数字收发器

介绍了一种新颖的用于CT0无绳电话标准的数字收发器.该收发器采用数字调制和解调技术来进行数据传输,取代了传统的模拟调制解调方式.在发射机中,使用小数分频锁相环实现了CPFSK调制;为了减小占用带宽,使用了2RC整形技术.在接收机中,使用了一种新颖的数字解调方法实现2RC CPFSK信号的解调.该芯片采用SMIC 0.35μm混合信号工艺实现,芯片尺寸为2mm×2mm.使用片外的低噪声放大器,该芯片的接收灵敏度可达-103dBm.     

一种新颖的CPM信号接收技术

以8CPFSK为例对连续相位调制（CPM）信号的同步技术和解调技术进行研究，并提出一种新颖的解调和同步联合的接收方案。该方案利用了“多符号差分检测”和CPM信号特有的相位特性，反馈地修正同步误差。仿真结果表明使用该方案不但能简便准确地同步信号接收。而且能大幅度提高连续相位调制信号的误码性能。     

基于Σ△调制技术的CPFSK调制芯片设计

采用Σ△调制技术的小数分频频率合成器设计了CPFSK调制电路,对调制电路的原理以及噪声性能进行了细致的分析.芯片集成了2RC波形成形电路、三阶单级Σ△调制器、双模分频器、鉴频鉴相器、电荷泵和压控振荡器,在四电平2RC-CP FSK调制时,16 kHz的带宽内可以实现25.6 kbps的信息速率传输.电路采用0.35μm标准CMOS工艺实现,调节片外电感,芯片最高工作频率可以到200 MHz.     

基于FPGA的2CPFSK全数字中频调制器的设计与实现

针对飞行器数据链中高码速率要求,需要使用数字技术实现传统模拟调制,以得到更好的调制性能,增加系统作用距离。本文介绍了二进制连续相位频移键控(2CPFSK)调制原理,提出了基于软件无线电架构的2CPFSK正交调制算法。该算法利用2CPFSK相位累加特性实现了基带数据的分数倍内插,从而适应宽范围码速率的调制。设计了提高频谱纯度的数字滤波器、基于FPGA+DAC架构的数字调制器硬件平台并实现算法。通过与传统模拟频率调制(FM)比较,该设计提升了1.7 dB调制性能,增加了系统作用距离。     

基于ΣΔ调制技术的CPFSK调制芯片设计

采用ΣΔ调制技术的小数分频频率合成器设计了CPFSK调制电路,对调制电路的原理以及噪声性能进行了细致的分析。芯片集成了2RC波形成形电路、三阶单级ΣΔ调制器、双模分频器、鉴频鉴相器、电荷泵和压控振荡器,在四电平2RC-CPFSK调制时,16kHz的带宽内可以实现25.6kbps的信息速率传输。电路采用0.35μm标准CMOS工艺实现,调节片外电感,芯片最高工作频率可以到200MHz。     

一种适用于塑料光纤局域网的收发器研究

提出了一种适用塑料光纤局域网的光纤收发器.收发器首先将输入的数据源进行CMI编码,再经过发送单元发送光信号;其次将接收到的光信号经过解码后送至光接收单元还原出原始数字序列.完成了仿真实验及实验室中与现有局域网中广泛使用的RJ-45接头的连接.实验证明该光纤收发器的可行性和有效性.     

基于FPGA／DDS原理的MSK信号调制与解调的设计与实现

本文提出了一种采用直接数字合成DDS原理和延时相干解调原理实现最小频移键控MSK信号的调制与解调的新方法。与传统采用直接提取载波进行相干解调的方法相比较,本文采用的新方法．避免了载波提取困难的问题：本设计建立了系统模型给出了基于现场可编程门阵列FPGA和DDS原理的MSK信号调制与解调的详细的软硬件架构设计及关键核心模块的设计方案,采用FPGA以及专用DDS芯片AD9851实现了调制与解调系统。     

8DPSK传真信号解调/再调制的DSP实现

介绍了数字电路倍增设备(DCME)中8DPSK传真信号的解调／再调制技术。提出了一种适于DSP实现的非相干基带差分解调算法,采用该算法不需恢复相干载波即可实现8DPSK传真信号的全数字解调。另外根据8DPSK调制信号的空间矢量图的特点,提出了采用相位旋转的抽样判决方法,大大降低了抽样判决的运算量。最后简要介绍了利用基带信号的包络特征实现8DPSK传真信号解调位同步技术的原理和DSP软件的实现方法。     

一种FSK反正切差分解调方法

针对频移键控在通信系统应用中其调制解调技术在一定程度上直接影响通信系统的性能,提出了一种FSK数字解调方法,称作反正切差分解调.该方法基于正交反正切算法,正交信号直接相除消除了幅度调制成分.新的方法适用于窄带和宽带的FSK信号并适合于数字接收机.仿真结果表明,该技术能有效解调FSK信号,并适合于多种制式的FSK信号.     

一种采用半速结构的CMOS串行数据收发器的设计

设计了一种单片集成的CMOS串行数据收发器.该收发器用于线上速率为1.25Gb/s的千兆以太网中,全集成了发送和接收的功能,主要由时钟发生器、时钟数据恢复电路、并串/串并转换电路、线驱动器和均衡器组成.为了降低系统设计难度和电路功耗,收发器采用了半速率时钟结构.电路采用1.8V 0.18μm 1P6M CMOS数字工艺,芯片面积为2.0mm×1.9mm.经Cadence Spectre仿真验证以及流片测试,电路工作正常,功能良好.     

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.     

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