同频同时全双工数字自干扰抵消算法

同频同时全双工是第五代移动通信（5G）提出的核心概念之一,其关键技术为自干扰抵消。其中数字抵消具备灵活高效的优势,进一步提高其性能是降低全双工节点的成本、功耗和复杂度的重要途径。本文首先介绍了基本数字抵消算法——信道估计重构法的原理,然后从提高自适应性、提高自干扰信号还原准确性以及实现简化三个角度介绍了改进算法。最后,展望了全双工数字自干扰抵消算法未来的研究方向,为全双工架构和算法设计提供参考。     

A Complex View of Barycentric Mappings

Barycentric coordinates are very popular for interpolating data values on polyhedral domains. It has been recently shown that expressing them as complex functions has various advantages when interpolating two‐dimensional data in the plane, and in particular for holomorphic maps. We extend and generalize these results by investigating the complex representation of real‐valued barycentric coordinates, when applied to planar domains. We show how the construction for generating real‐valued barycentric coordinates from a given weight function can be applied to generating complex‐valued coordinates, thus deriving complex expressions for the classical barycentric coordinates: Wachspress, mean value, and discrete harmonic. Furthermore, we show that a complex barycentric map admits the intuitive interpretation as a complex‐weighted combination of edge‐to‐edge similarity transformations, allowing the design of “home‐made” barycentric maps with desirable properties. Thus, using the tools of complex analysis, we provide a methodology for analyzing existing barycentric mappings, as well as designing new ones.     

Analysis of the M/G/1 queue with discriminatory random order service policy

We consider an M/G/1 queue with different classes of customers and discriminatory random order service (DROS) discipline. The DROS discipline generalizes the random order service (ROS) discipline: when the server selects a customer to serve, all customers waiting in the system have the same selection probability under ROS discipline, whereas customers belonging to different classes may have different selection probabilities under DROS discipline. For the M/G/1 queue with DROS discipline, we derive equations for the joint queue length distributions and for the waiting time distributions of each class. We also obtain the moments of the queue lengths and the waiting time of each class. Numerical results are given to illustrate our results.     

Probabilistic Marching Cubes

In this paper we revisit the computation and visualization of equivalents to isocontours in uncertain scalar fields. We model uncertainty by discrete random fields and, in contrast to previous methods, also take arbitrary spatial correlations into account. Starting with joint distributions of the random variables associated to the sample locations, we compute level crossing probabilities for cells of the sample grid. This corresponds to computing the probabilities that the well‐known symmetry‐reduced marching cubes cases occur in random field realizations. For Gaussian random fields, only marginal density functions that correspond to the vertices of the considered cell need to be integrated. We compute the integrals for each cell in the sample grid using a Monte Carlo method. The probabilistic ansatz does not suffer from degenerate cases that usually require case distinctions and solutions of ill‐conditioned problems. Applications in 2D and 3D, both to synthetic and real data from ensemble simulations in climate research, illustrate the influence of spatial correlations on the spatial distribution of uncertain isocontours.     

SSD: Smooth Signed Distance Surface Reconstruction

We introduce a new variational formulation for the problem of reconstructing a watertight surface defined by an implicit equation, from a finite set of oriented points; a problem which has attracted a lot of attention for more than two decades. As in the Poisson Surface Reconstruction approach, discretizations of the continuous formulation reduce to the solution of sparse linear systems of equations. But rather than forcing the implicit function to approximate the indicator function of the volume bounded by the implicit surface, in our formulation the implicit function is forced to be a smooth approximation of the signed distance function to the surface. Since an indicator function is discontinuous, its gradient does not exist exactly where it needs to be compared with the normal vector data. The smooth signed distance has approximate unit slope in the neighborhood of the data points. As a result, the normal vector data can be incorporated directly into the energy function without implicit function smoothing. In addition, rather than first extending the oriented points to a vector field within the bounding volume, and then approximating the vector field by a gradient field in the least squares sense, here the vector field is constrained to be the gradient of the implicit function, and a single variational problem is solved directly in one step. The formulation allows for a number of different efficient discretizations, reduces to a finite least squares problem for all linearly parameterized families of functions, and does not require boundary conditions. The resulting algorithms are significantly simpler and easier to implement, and produce results of quality comparable with state‐of‐the‐art algorithms. An efficient implementation based on a primal‐graph octree‐based hybrid finite element‐finite difference discretization, and the Dual Marching Cubes isosurface extraction algorithm, is shown to produce high quality crack‐free adaptive manifold polygon meshes.     

基于3G无线网络的工业监控系统设计

设计了一种基于3G无线网络工业监控系统,把自动控制技术和先进的移动通信技术相结合,使用便携手机作为监控终端,利用3G无线网络实时清晰地传递工业现场的动态信息,并将监控人员控制命令下达给现场设备,管理设备运行,针对控制功能提供权限认证,当遇到异常情况时,及时发出报警信息。     

基于PCS7的全液压矫直机监控系统

介绍了PCS7软件在四重式全液压可逆十一辊矫直机控制系统中的应用,以及一个包含了自动化站、主操作站、监控站、工程师站等的分布式计算机控制系统。该系统通过PLC控制变频器,实现传动电机速度控制,以及通过液压调整位置控制回路,实现板材矫直中辊缝位置的设定与恒定保持;这样矫直的钢板,头尾均得到很好的矫直质量。     

固态数字语音记录仪的设计与实现

介绍一种固态数字语音记录仪的实现方案。它主要由ＤＳＰ最小系统、液晶显示模块、串行通信接口、键盘电路和片外闪烁存储器电路构成。实现语音信息的采集与播放,并且能够和笔记本电脑通过ＲＳ２３２串行口进行通信。     

PLC在高浓度冲稀自动控制系统的应用

本文在介绍高浓度冲稀自动控制系统的工作原理、特点、系统调校及日常维护要点的基础上,探讨了PLC在这种类型的系统中的应用。     

论3G无线通信技术分析

3G无线通信技术是移动通信技术在经历了第一代模拟制式手机（1G和）第二代GSM、CDMA等数字手机（2G）的基础上研发出来的,所谓的第三代移动通信技术。这种技术给传输信息通达全球性。但是在通信技术高速发展的今天,这种技术会不会被已有的通信技术所代替,能不能在其基础上进一层次的研发,达到社会的需求,或者这种技术的生命期还有多长是个未知数。本文针对3G技术的发展趋势和应用与及前帚作了分析。