The Research on 220GHz Multicarrier High-Speed Communication System

This paper presents our investigation into a 220 GHz multicarrier highspeed communication system based on solid state transceivers.The proposed system has eased the demand of high sampling rate analog-to-digital converter(ADC)by providing several signal carriers in microwave band and converting them to 220 GHz channel.The system consists of a set of 220 GHz solid-state transceiver with 2 signal carriers,two basebands for 4 GSPS ADCs.It has achieved 12.8 Gbps rate real-time signal transmission using 16QAM modulation over a distance of 20 m without any other auxiliary equipment or test instruments.The baseband algorithm overcomes the problem of frequency difference generates by non-coherent structure,which guarantees the feasibility of long-distance transmission application.Most importantly,the proposed system has already carried out multi-channel 8K video parallel transmission through switch equipment,which shows the multicarrier high-speed communication system in submillimeter wave has great application prospects.To the best of the authors’knowledge,this is the first all-solid-state electronics multicarrier communication system in submillimeter and terahertz band.     

移动互联网时代充值支付在新渠道快速上线的体系分析

随着网络的快速发展和手机功能的不断强大,互联网发生了用户习惯的大改变。为了更好地适应顾客消费习惯的改变,以服务赢得用户、跟随用户的步伐拓展渠道成为中国移动当前业务发展的新方向,秉持为客户提供最便利的服务的宗旨,开展建设互联网充值新渠道。文章以中国移动为例,介绍了其互联网时代充值支付在新渠道快速上线的体系,并结合当前形势进行简单的分析。     

运动图像的锯齿消除算法研究

针对隔行扫描到逐行扫描转换中出现的运动图像锯齿现象,提出适用于去锯齿的运动检测和基于角度提取的场内插值算法。利用相邻4场运动差值进行运动检测,并结合待插像素相邻行和隔行相关像素点的夹角进行加权平均,提取相关度大的角度点进行场内插值。实验结果表明,算法有效提高了峰值性噪比,也有效降低了均方差,实际图像去锯齿效果良好。     

A Low On-Resistance SOI LDMOS using a Trench Gate and a Recessed Drain Ge Rui(葛锐), Luo Xiaorong(罗小蓉)?, Jiang Yongheng(蒋永恒), Zhou Kun(周坤),

本文提出了一种超低比导通电阻(R_on,sp) SOI槽栅凹漏MOSFET(TGRD MOSFET)。正向导通时,槽栅和凹漏的结构增加了导电区域,缩短了电流流经的路径,从而降低了比导通电阻。并且此结构中采用了RESURF结构提高了漂移区浓度,进一步降低了比导通电阻。当TGRD MOSFET的半个元胞尺寸为6.5μm时,它的击穿电压为97V,R_on,sp为0.985mΩ.cm₂。与SOI槽栅MOSFET(TG MOSFET)和常规MOSFET(Conventional MOSFET)相比,在相同的BV下,TGRD MOSFET的R_on,sp分别地降低了46%和83%。或者在相同的R_on,sp下,与SOI槽栅槽漏MOSFET(TGTD MOSFET)相比, BV提高了37%。     

纯方位目标跟踪极坐标模型的状态空间变换方法

在纯方位目标跟踪定位研究领域里,采用极坐标模型,可以实现可观测状态和不可观测状态的分离,但非线性的系统方程使算法的具体实现非常困难。利用状态空间的变换,可避免直接计算非线性函数雅可比矩阵的值,减小了计算量,提高了滤波稳定性。     

A Coding and Automatic Error-Correction Circuit Based on the Five-Particle Entangled State

In this paper, we discuss the concepts of quantum coding and error correction for a five-particle entangled state. Error correction can correct bit-reverse or phase-flip errors of one and two quantum states and is no longer limited to only one quantum state. We encode a single quantum state into a five-particle entangled state before being transferred to the sender. We designed an automatic error-correction circuit to correct errors caused by noise. We also simplify the design process for a multiple quantum error-correction circuit. We compare error-correction schemes for five and three entangled particles in terms of efficiency and capabilities. The results show that error-correction efficiency and fidelity are im- proved.     

Detecting Hot Road Mobility of Vehicular Ad Hoc Networks

Vehicular Ad Hoc Networks (VANETs) can provide value-added services to both drivers and passengers with on-board vehicular communication systems. Node mobility and volatile wireless connection in VANETs affect inter-contact time (T _I ) between mobile nodes, which greatly degrades the performance of vehicular applications. Nevertheless, the node spatial distribution in VANETs is another important factor especially in real applications. It positively affects the inter-contact time of vehicular nodes. By leveraging it, we can significantly improve the performance of data transmissions and inter-vehicle communication. To this end, we investigate the data collected from around 4,000 taxisin Shanghai and propose in this paper an efficient hot road mobility model. We find that most taxis distribute on some hot roads, which makes the node spatial distribution follow the power law. Based on this observation, we propose the concepts of indirect contact and heterogeneous inter-contact time (T _H ) to reveal how hot roads can change the distribution of inter-contact time. We find that the tail distribution of T _H also appears the power law, and both node spatial distribution and T _H distribution decay at least as the power law. We further propose a model for detecting vehicle mobility in hot roads, which can generates synthetic traces that captures both spatial and temporal features of nodes in VANETs.     

数字化PGC解调光纤水听器的动态范围

阐述了基于数字化PGC解调的光纤水听器基本原理,对该系统最大可测信号及最小可测信号进行了理论分析,得出了系统动态范围的主要决定因素。搭建光纤水听器系统,测试了光纤水听器系统的自噪声谱级,建立标准得到系统的最大可测信号。当带宽为63～1600Hz时,测得系统的动态范围高达108～120dB。     

通信机房环境温度调整节能研究与分析

从深入挖掘通信机房节能潜力的角度出发,在保障机房通信设备正常运行的条件下,对机房温度、空调设置温度及总体能耗三者的关联关系进行研究与分析;通过建立量化的数据分析模型,测算出不同环境条件和设备工况下,温度调整后相对准确的节能数据,为后续的工作提供参考依据。     

构造嵌入式Linux系统

文中首先介绍了嵌入式Linux系统的优点及其广泛应用.然后针对构造一个Linux嵌入式操作系统所面临的问题作了具体深入的分析.这些问题具体包括如何精简内核以及系统启动过程的细致分析,如何为硬件编写驱动程序.