一种可管理的智能企业网关

针对中小企业的常见信息化需求,文章提出了一种新型的双核智能网关,在传统网关的基础上增加应用处理器,为网关添加执行通用应用的能力,实现诸如高性能文件共享、信息化应用加载、外设扩展等功能。双核智能网关中间件的引入,统一了智能网关的软件运行环境,降低了新一代智能企业网关的硬件开发难度和开发成本。     

一种基于Femto的GSM网关设计与实现

GSM网络用户众多,在GSM接入网中引入Femto架构,符合移动通信网络扁平化发展趋势。在此研究基于Femto架构的GSM网关,作为用户端数据接入核心网的接口,将移动、宽带和固定业务融合在一起,在GSM网络中将发挥重要的作用。采用IP化承栽方式,Abis接口完全IP化,用模块化设计方法,基于Femto架构,在ATCA的平台上设计实现了具有信令处理、数据转换、编码转换及速率适配、路由等4功能的GSM网关,通过该网关已打通电话,语音质量达到商用,具有重要的实际应用价值。     

基于物联网的智能家居服务网关的设计

为了实现智能家居系统中的远程及近程控制,从物联网的概念出发,设计实现了一个嵌入式的WEB网关服务器,将基于Zigbee协议的无线传感器网络与基于TCP/IP协议的Internet相联。该设计采用STM32F107VC为主控制器,通过串口实现与WSN协调器的通信,外接一个网卡芯片实现与Internet的连接。在软件设计上重点实现智能家居通信控制系统,并引入嵌入式操作系统uCOS-II对系统资源进行管理,移植LwIP协议栈实现TCP/IP的基本功能。     

RF-TSV design, modeling and application for 3D multi-core computer systems

The state-of-the-art multi-core computer systems are based on Very Large Scale three Dimensional (3D) Integrated circuits (VLSI). In order to provide high-speed vertical data transmission in such 3D systems, efficient Through-Silicon Via (TSV) technology is critically important. In this paper, various Radio Frequency (RF) TSV designs and models are proposed. Specifically, the Cu-plug TSV with surrounding ground TSVs is used as the baseline structure. For further improvement, the dielectric coaxial and novel air-gap coaxial TSVs are introduced. Using the empirical parameters of these coaxial TSVs, the simulation results are obtained demonstrating that these coaxial RF-TSVs can provide two-order higher of cut-off frequencies than the Cu-plug TSVs. Based on these new RF-TSV technologies, we propose a novel 3D multi-core computer system as well as new architectures for manipulating the interfaces between RF and baseband circuit. Taking into consideration the scaling down of IC manufacture technologies, predictions for the performance of future generations of circuits are made. With simulation results indicating energy per bit and area per bit being reduced by 7% and 11% respectively, we can conclude that the proposed method is a worthwhile guideline for the design of future multi-core computer ICs.     

基于ZigBee的无线传感器网络网关的设计与实现

文中给出了基于ZigBee技术的无线传感器网络网关的设计方案。网关节点以微芯公司的PIC24FJ128GA010单片机为MCU,射频芯片为MRF24J40MA,采用串口转以太网模块达到协议转换的目的。软件方面采用微芯的开源ZigBee协议栈。     

Simplified gateway selection scheme for multihop relay in vehicular ad hoc network

Integrating vehicular ad hoc network (VANET) and universal mobile telecommunication system (UMTS) could be a promising architecture for future machine‐to‐machine applications. This integration can help vehicles have steady Internet connection through the UMTS network and in communicating with other vehicles. However, dead spot areas and unsuccessful handoff processes caused by the high speed of vehicles can disrupt the implementation of this kind of architecture. In this paper, a new simplified gateway selection (SGS) scheme for multihop relay in a VANET‐UMTS integration network is proposed. The proposed scheme extends the coverage or/and calming of the frequent handoff process and allows vehicles to continue to be connected to the UMTS infrastructure network. An integrated simulation environment that combines VanetMobiSim and NS2 is used to simulate and evaluate the proposed scheme. The simulation results show that the SGS scheme performed better when it was implemented with ad hoc on a demand distance vector routing and destination‐sequenced distance vector routing protocols. Furthermore, the SGS scheme is compared with other cluster‐based gateway selections used in the previous works. The results show that our SGS scheme outperforms other cluster‐based gateway selections scheme in terms of selection delay, control packet overhead, packet delivery ratio, and overall throughput. Copyright © 2013 John Wiley & Sons, Ltd.     

中小型电视台媒体文件安全交互平台的设计与应用

针对文成电视台(文中简称"我台")制播网络和外部网络文件交互使用的现状,提出架构高安全、高效率的媒体文件传输平台的必要性和重要性。详细阐述了媒体文件安全交互平台的系统架构和工作原理,并在线对该系统平台的安全性能和传输效率进行测试。实践证明该系统可以实现高安全、高可靠、高效率的数据交互,完全符合中小型电视台全台网数据安全交互的需求。     

美国F-22"猛禽"战斗机综合化航空电子系统概述

本文结合现代航空电子系统的发展情况,介绍了典型第四代战斗机-美国的F-22“猛禽”战斗机的技战术特点、综合化航空电子体系结构以及主要设备的功能和性能等,并提出了研究和发展建议。     

无线数字家庭娱乐研究

对数字家庭及娱乐系统的内、外部网络进行了介绍,重点阐述了在数字家庭及娱乐无线化的过程中可采取的模式,提出了改进型无线家庭网关、3G家庭无线网关、嵌入式家庭无线网关3种家庭无线网关形式及其结构,为数字家庭及娱乐的无线化进程提供了思路和方法。     

MOS-only complex filter design for dual-band GNSS receivers

In this paper, the use of MOS-only active filters in the implementation of area-effective low-IF image reject filters is discussed. For this purpose, complex filter design procedure is considered regarding MOS-only filter realization techniques and a new second-order filter topology which favors filter’s area-effective implementation is proposed. Owing to the presented approach, a new complex image-reject filter with reduced chip area, which can be used in dual-band GNSS receivers, is obtained. Issues related to IQ imbalance are briefly discussed and a calibration imbalance circuit is proposed. By virtue of the current-mode design technique, the IQ imbalance circuit is embedded with the complex filter, simplifying the system topology. In order to illustrate the feasibility of the filter, post-layout simulation results of a fourth-order Butterworth-type image reject filter designed for dual-band GNSS receivers are provided using SPECTRE simulation tool in CADENCE design environment.