Current-crowding effect in diagonal MOSFET's

Electrical and reliability characteristics of diagonally shaped n-channel MOSFETs have been extensively investigated. Compared with the conventional device structure, diagonal MOSFETs show longer device lifetime under peak I_sub condition (V_g =0.5 V_d). However, in the high-gate-bias region (V_g=V_d), diagonal MOSFETs exhibit a significantly higher degradation rate. From the I_sub versus gate voltage characteristics, this larger degradation rate under high gate bias is concluded to be due mainly to the current-crowding effect at the drain corner. For a cell-transistor operating condition (V_g>V_d), this current-crowding effect in the diagonal transistor can be a serious reliability concern     

多天线对角空频编码传输

将平坦衰落信道的对角代数空时码(DAST)推广到频率选择性衰落信道,提出了对角空频分组码(DSF).基于多输入多输出天线和正交频分复用(OFDM),DSF码将满秩的旋转信号星座和子载波分组结合起来,以对角发送方式(每时刻只有一个天线发射)发射旋转信息符号向量的每个分量.成对错误概率分析表明:在频率选择性信道中,通过选择最佳的旋转矩阵,这种DSF-OFDM系统能实现满分集增益和最大的编码增益.系统采用了球型解码器对DSF码实施最大似然解码,它的解码复杂性是中等的,并且,解码算法的复杂性与信号星座的维数无关.此外,和先前所提出的一些方法相比,提出的空频码还具有频谱效率高(1symbol/s/Hz)的性能特点.     

High-gain step-profiled integrated diagonal horn-antennas

Dipole-excited integrated horn antennas are limited by their large flare angle of 70°, which is inherent in the anisotropic etching process of 〈100〉 silicon wafers. The large flare angles does not allow for integrated horns with gain higher than 13 dB and for 10-dB beamwidths less than 90°. A step-profiled horn is proposed which reduces the effective flare angle of the horn and allows gains in the region 17 dB to 20 dB to be achieved. The symmetry of the horn's radiation pattern is enhanced by positioning the exciting dipole along the diagonal of the horn cavity. A specific design example is shown with a gain of 18.4 dB and a 10-dB beamwidth of 37° in the E, H and 45° planes. The coupling efficiency of this horn to a Gaussian beam is calculated to be 83%. An equivalent smooth envelope-horn was built at 12.1 GHz and the measured patterns agree well with theory. The integrated step-profiled horn is well suited for millimeter-wave and terahertz focal plane imaging arrays requiring a large number of elements     

VANET中路由协议分析

分析目前大多数VANET路由算法,将其归类为基于位置的贪婪路由算法、基于锚节点路由算法、基于街道集路由算法和基于簇路由算法,并着重于这些特点设计每类算法,通过NS2仿真实验对比和分析,为进一步的研究提出新的课题。     

GMPLS路由算法研究

首先简要介绍了路由算法的一些特征及设计目标.在此基础上重点讨论了基于GMPLS的网络各种不同的路由算法,并对各种路由算法做了简单的对比.     

路由协议测试研究—边界网关路由协议BGP—4测试

现有测试理论和方法在路由协议测试中面临挑战。由于路由协议具有与通信协议不同的特点,现有测试系统的能力已经难以满足测试需求,本文介绍了在路由协议测试中进行的探讨和实践,深入分析了路由协议的特点,在此基础上对现有测试方法的适用性进行考察,选择了相应的测试方法和结构,扩充了测试系统中的考实现增强测试能力,设计了TTCN格式的测试集,通过测试实践,证实所用方法手段的有效性,并为国产路由器的开发提供了有力的支持。     

零陷展宽对角载入算法

提出了零陷展宽对角载入算法,该算法既解决了干扰在快速运动时,干扰零陷过窄的问题,又解决了协方差矩阵误差和导向矢量误差存在时,算法稳定性变差的问题。同时,通过对角载入因子和采样协方差矩阵间的关系确定了对角载入算法载入因子的值。计算机仿真结果表明该算法有很好的稳健性,以及较宽的零陷。     

ASON动态路由解决方案浅析

以自动交换光网络(ASON)标准路由模型为基础,介绍了域间路由协议在ASON路由中的实现方法,并针对其动态路由算法的不足进行分析,结合ASON控制平面发展趋势提出了初步的解决方法.     

Double-sided least-squares problem with diagonal constraints

The double-sided least-squares problem with a constrained parameter matrix is formulated and solved using multilinear products.     

基于对角切片特征提取和深度学习的辐射源识别

针对复杂电磁环境下辐射源识别率低的问题，提出基于对角切片特征和深度学习的辐射源识别算法。利用辐射源信号双谱的个体特性，提取信号双谱对角切片特征作为深度学习模型的输入数据，采用Softmax分类器进行辐射源识别。仿真实验利用两部同型辐射源进行测试，结果表明该算法能识别个体辐射源，在低信噪比条件下也能获得高的辐射源识别率；相比于其他识别算法，双谱对角切片特征有更鲁棒的分辨性。     

一种基于自适应对角加载的雷达通道均衡算法

雷达通道均衡可以保证通道间的幅度和相位一致性。对角线加载技术能减弱均衡器阶数增加带来的矩阵病态的影响,改善了均衡性能,但是加载量的确定是一个比较困难的问题。文中提出采用自适应对角线加载进行雷达通道均衡的算法,提高了通道均衡的稳健性。仿真结果证明了该算法的有效性。     

On diagonal algebraic space-time block codes

Theoretical and practical aspects of diagonal algebraic space-time block codes over n transmit and m receive antennae are examined. These codes are obtained by sending a rotated version of the information symbols over the principal diagonal of the n /spl times/ n space-time matrix over n transmit antennae and n symbol periods. The output signal-to-noise ratios of two predecoding filters and two decoding algorithms are derived. Analysis of the information loss incurred by using the codes considered is used to clarify their structures, and the expected performances. Different algebraic real and complex rotations presented in the literature are analyzed and compared as regards the achieved coding gains, the complexities, performances, and peak-to-mean envelope power ratios.     

Two-dimensional block diagonal LMS adaptive filtering

The paper is concerned with the development of two-dimensional (2D) adaptive filters using the block diagonal least mean squared (BDLMS) method. In this adaptive filtering scheme, the image is scanned and processed block by block in a diagonal fashion, and the filter weights are adjusted once per block rather than once per pixel. The diagonal scanning is adopted to avoid the problems inherent in the 1D standard scanning schemes and to account for the correlations in two directions. The weight updating equation for 2D BDLMS is derived, and the convergence properties of the algorithms are investigated. Simulation results that indicate the effectiveness of the 2D BDLMS when used for image enhancement, estimation, and detection applications are presented     

Introducing intelligent sensors in presses for plastic material injection

This paper presents some theoretical and experimental results concerning the introduction of advanced sensors in the design and development of a new generation of presses for plastic material injection used to produce washing machine tubs. The architecture of the control system for the presses is based on a distributed solution and relies on fieldbus communications to obtain a graceful migration path to the adoption of sensors of a new generation. This enables a dramatic decrease in both the cabling complexity and cost, together with a significant improvement in the performance of the whole machine. The adoption of the field network to connect sensors and actuators to the controller has been carefully evaluated by means of a preliminary theoretical analysis. Then, two test systems have been implemented to collect data and performance figures by carrying out experiments and measures on some of the real devices selected for the design of press control equipment.     

BGP路由的动态性研究

BGP路由的不断变化使得对协议策略的维护、定位路由故障、控制协议流量十分困难。本文从优化BGP路由策略配置、解释产生路由更新的根本来源、预测BGP的路由行为等角度对BGP路由的动态特征的相关研究进行介绍,进而对不同研究进行比较分类,剖析其优劣。     

Multidimensional digital filtering by using parallel algorithms based on diagonal processing

An approach for massive parallel processing in multidimensional digital filtering, which has briefly been introduced for causal digital filters in previous publications, is generalized and examined in more detail. It is based on a suitably modified sampling procedure combined with diagonal processing and does not require any additional arithmetic operations in comparison with corresponding conventional digital filtering. The condition that has to be satisfied for making the approach suitable for full parallel processing is derived. Properties of diagonal hyperplanes as required for the present approach are discussed.     

Reconfiguration of hexagonal arrays by diagonal deletion

This paper describes various algorithms for dynamic reconfiguration of VLSI hexagonal arrays. These algorithms are applicable to arrays in which reconfiguration requires logical deletion of the diagonal front of computation. Initially it is proven that the intuitive, but rather naive approach of diagonal deletion is not correct, because it does guarantee the generation of the correct dimensions in the target array.A new approach based on geometrical considerations is proposed. Theorems that preserve the dimensions of the desired target array, are presented. Two reconfiguration algorithms are presented. These algorithms have linear time-complexity with respect to the dimensions of the array. The innovative features of this approach are the dependence of reconfiguration on the dimensions of the array to be reconfigured and a better exploitation of redundancy for run-time reconfiguration. Simple switching circuits are described. It is proved that silicon overhead consists of four two-by-two Banyan switches per cell. Illustrative examples are presented.     

Active routing

Active routing permits individual customers, network managers, or network owners to control the paths that their data takes through the network. The objective is to allow routing mechanisms that provide quality of service (QoS), mobility, etc., to be quickly deployed, without waiting for standards, and to allow different routing mechanisms, that provide similar services, to compete. The current work on label switching (MPLS) can also be used to give high level customers, such as virtual private networks (VPNs), more control over their paths. We show how active routing can extend the capabilities of MPLS. We address several implementation issues, including pricing and distributed sandboxes. Pricing or policing must be used to limit the resources that customers acquire, in order to encourage them to use network resources economically. Sandboxes must be used to limit the resources that the participants acquire, in order to limit the harm that they can inflict on other participants. Active routing creates a free market system where network providers compete to sell their resources and implementers compete to sell their active routing programs. We establish a framework to quantitatively compare networks and service providers. As an example, we route Internet protocol (IP) telephony over combinations of circuit and packet networks     

自动交换光网络(ASON)分级路由技术的研究

路由技术是自动交换光网(ASON)的核心技术之一．文章在分析ASON的层网络结构、路由结构以及路由功能部件相互作用的基础上，重点讨论了ASON的分级路由技术，包括分级路由的网络结构及其详细的操作步骤．