Experimental Results of Testing a BIST Σ–Δ ADC on the HOY Wireless Test Platform

High pin count packaging and 3D IC technology make testing such advanced ICs more and more difficult and expensive. The HOY wireless test platform provides an alternative and cost-effective test solution to address the poor accessibility and high test cost issues. The key idea is implementing a low-cost and short-distance wireless transceiver on chip so that all test instructions and data can be transmitted without physical access. Due to the limited wireless bandwidth, all modules in the device under test (DUT) are preferred to have some built-in self-test (BIST) features. Prior works successfully demonstrated that DUTs with memory and digital circuits can be tested on the low-cost wireless test platform. However, there is no example to show if it is also possible to test the DUT embedded with analog circuits on the HOY test platform. This paper demonstrates the first system-level integration including hardware and software for testing a fully-integrated BIST ADC on the HOY wireless test platform. The DUT chip fabricated in 0.18-μm CMOS consists of a second-order Σ–Δ ADC under test (AUT) and the BIST circuitry. The AUT design employs the decorrelating design-for-digital-testability (D³T) scheme to make itself digitally testable. The BIST design is based on the modified controlled sine wave fitting (CSWF) method. The required BIST circuits are purely digital and as small as 9.9k gates. The gate count of the HOY test wrapper is less than 1k. Experimental results obtained by the HOY wireless test platform show that the AUT achieves a dynamic range of 85.1 dB and a peak SNDR of 78.6 dB. The wireless test results show good agreement with those acquired by conventional analog tests.     

GPRS支持下的WPKI设计与实现

针对GPRS系统接入安全风险大的特点,提出了与WPKI相结合的终端接入认证方案,并对该方案进行了分析研究。提出了将无线公钥基础设施（WPKI）应用于GPRS平台以获得应用层无线安全保障的方案。设计了一个将WPKI体系和GPRS平台结合起来的实验系统,给出了各个功能模块的逻辑和功能结构图,并基于开源代码库Openssl对试验系统中的CA服务器和RA服务器进行了实现和测试,在GPRS平台上实现了WPKI核心内容一证书申请、证书签发、证书查询、证书撤销等。经过测试,该实验系统能在实际的GPRS平台上可靠运行。     

基于WinCE的B/S模式WSN网关的研究与实现

为方便用户对无线传感器网络的监控,设计了一种基于windows CE的B/S模式WSN网关.且为提高Web访问速度以及并发访问能力,采用了Web API技术,使用WinCE自带的Web Server,该Web Server支持ISAPI标准.使用ISAPI标准编写的程序较现有CGI程序执行更快,耗费的系统资源更少,实验表明该方案可行并且有效.     

An Access Mechanism for Embedded Sensors in Modern SoCs

With technology scaling, the number of sensors integrated into modern system-on-chip (SoC) designs has increased greatly over the past several years. These sensors must be accessed for a number of reasons (test, configuration, calibration, etc.). This paper proposes a novel sensor access mechanism (SAM) to address sensor access in various operation modes, including manufacturing test mode, functional mode, built-in self-test (BIST) mode, silicon validation mode, and calibration mode. Within this mechanism, we develop a structured and scalable sensor access architecture and a pipeline sensor access flow. The SAM architecture addresses sensor insertion and access in different scenarios, while the pipeline flow is developed by utilizing the features of sensor measurement and hardware architecture to improve the efficiency of sensor access. Moreover, SAM standardizes the testing and measurement of embedded sensors by providing easy and effective access to sensors distributed across the SoC. Further, SAM is JTAG-compatible and practice-oriented for easy industry adoption. Various simulation results, collected by integrating SAM into several benchmarks, demonstrate that sensor controllability and observability can be achieved with high efficiency and low overhead using the proposed architecture.     

一种消除虚假定位目标的方法

利用单传感器检测能力的先验信息,导出了多传感器系统的多假设检验数据关联方法,并将该方法用于多传感器定位系统以消除虚假定位目标。计算机模拟表明,该方法对虚假定位目标的消除具有较好的效果。     

An efficient cluster-based communication protocol for wireless sensor networks

A wireless sensor network is a network of large numbers of sensor nodes, where each sensor node is a tiny device that is equipped with a processing, sensing subsystem and a communication subsystem. The critical issue in wireless sensor networks is how to gather sensed data in an energy-efficient way, so that the network lifetime can be extended. The design of protocols for such wireless sensor networks has to be energy-aware in order to extend the lifetime of the network because it is difficult to recharge sensor node batteries. We propose a protocol to form clusters, select cluster heads, select cluster senders and determine appropriate routings in order to reduce overall energy consumption and enhance the network lifetime. Our clustering protocol is called an Efficient Cluster-Based Communication Protocol (ECOMP) for Wireless Sensor Networks. In ECOMP, each sensor node consumes a small amount of transmitting energy in order to reach the neighbour sensor node in the bidirectional ring, and the cluster heads do not need to receive any sensed data from member nodes. The simulation results show that ECOMP significantly minimises energy consumption of sensor nodes and extends the network lifetime, compared with existing clustering protocol.     

基于红外的智能跳远测试仪研究

跳远测试仪是智能体质测试系统的一个子系统.为解决传统接触式跳远检测方法存在的问题,提出基于红外传感器阵列的智能跳远测试仪模型.通过同步驱动逻辑、时间片轮转策略和时序优化方法,消除传感器组之间的干扰,保证了系统的精度和响应速度.在起跳位置自适应、二次扫描算法和无线通讯的基础上,实现了跳远的完全自动检测.实验结果表明,提出的模型和算法有效地实现了智能跳远测试仪自动化、数字化、高精度、快响应和使用寿命的统一.     

基于GNU Radio&USRP的IEEE802.15.4/6双协议收发系统

随着无线传感网络技术的不断发展,面向不同应用场景的单协议通信系统已满足不了各种应用场景的需求,如远距离或者高速率等.充分利用IEEE802. 15. 4标准的远距离和IEEE802. 15. 6标准的高速率特征,采用GNU Radio+USRP软件无线电平台来实现双协议互补无线通信功能,主要工作包括两种协议的媒体访问控...     

REALISM:一种面向未来异构无线网络演进的架构

未来无线通信系统将是各种无线接入技术和标准的融合,包容各自独立的网络,形成通用的平台并以简便的协议和信令操作,来实现异构网络融合是我们提出REALISM(REconfigurable:Adaption Layer for Integrated SysteM)的初衷,它通过在协议栈添加适配层(REAL:REconfigurable Adaption Layer),为由WLAN和UMTS组成的无线异构网络提供了融合的平台.文章重点关注了REALISM架构中的主要功能模块;然后描述了无线资源管理方面功能的实现,并以切换管理,例进行详细阐述.     

基于JESS的智能家居安防系统设计

根据目前世界智能家居安防市场和安防技术的发展趋势,提出了基于JESS的智能家居安防系统设计。首先介绍系统是根据基于JESS的专家系统、嵌入式和无线传感器等技术进行研究的,系统的组成包括门禁子系统、防盗报警子系统、防火灾报警子系统、防燃气泄漏子系统等。基于Java语言开发的规则引擎JESS专家系统,能够根据家庭内发生的场景来判断家庭状况是否处于安全状态,并对非安全状态做出及时反映。最后的仿真结果验证了系统的设计。     

基于无线传感网络的手机实时医疗监护系统简

针对通过住院观察病人的心电图来对心血管疾病进行诊断的方法的不足,文中采用无线传感网络作为监控系统的信息采集平台,将其应用于人体健康监控领域,设计并实现了一款基于无线传感网络的手机实时医疗监护系统。系统通过无线传感网络来对患者的心电数据进行集中式管理．并可通过医生工作站来实现对患者的远程病情诊断。与目前现有的远程医疗监护系统相比,基于无线佳感网络的手机实时医疗监护系统具有精确度高、实时性好、能耗低、部署方便、设备廉价等一系列优势。     

RF energy harvesting: an analysis of wireless sensor networks for reliable communication

Wireless Networks - In this paper, we consider a wireless energy harvesting network consisting of one hybrid access point (HAP) having multiple antennas, and multiple sensor nodes each equipped...     

车载双模无线视频监控系统的设计与实现

设计并实现了一种基于WCDMA和CDMA2000 EVDO无线3G网络的车载式双模无线视频监控系统。介绍了车载式视频监控终端嵌入式设备的整体硬件结构,以及相应功能模块定义和说明。从系统总体结构、主要流程图和关键技术等方面详细描述了监控中心的软件实现。测试结果表明,该车载式监控系统充分利用WCDMA和CDMA2000 EVDO双模网络进行数据传输,相比于传统单模视频传输系统,有效提高了视频传输质量。     

结构无线应变传感器设计、制作与测试

针对传统的应变采集传输方法存在的问题,结合电阻应变片工作机理,提出了一种用于结构局部应变监测的无线传感器及其系统;重点介绍了系统的核心部分。即无线应变传感器,的组成及功能;并详细讨论了该无线采集传输装置中典型电路的设计,给出了软件流程图;最后对所研制的系统进行了实验。结果表明：所研制的无线传感器及其系统,具有采集准确、传输可靠、价格低廉、携带方便、简单实用等特点,适合在实际工程中应用推广。     

基于Basic—RF的家居环境监测预警系统设计

针对实际应用需求,结合Basic-RF无线通信技术、网络通信技术和GSM通信技术设计了一种基于Basic—RF的家居环境监测预警系统。系统由信息处理子系统和无线传感器网络子系统两部分组成,无线传感器网络子系统利用CC2530的Basic．RF双向无线通信协议结合应用层算法构建,信息处理子系统以STM32单片机为核心,利用ENC28J60网络模块以及SIM900A短信模块实现数据的远程传输。用户可通过上网设备方便地监测家居环境数据。当环境异常时会及时收到报警短信。实验结果表明,该系统具有稳定性高、实用性强、灵活性好的优点,对家居环境监测和预警具有广泛的应用前景。     

WLAN层间服务接口设计与FPGA实现

提出一种无线局域网中物理层与媒体访问控制(MAC)层的层间接口设计方案。该方案分别从硬件连线规划、地址分配、层间原语交互操作和层间数据收发等几个方面进行设计,并在FPGA上实现。通过一套完整的无线传输实验平台进行实验验证,结果表明,此接口功能符合IEEE 802.11a协议要求,物理实现简单,可扩展性好。     

基于ZigBee的家庭网关的设计与实现

ZigBee作为一种近距离,低复杂度,低功耗,低成本的无线自组网络通信技术,在工业信息化、家电智能化等方面有着广泛的应用。针对家电智能化应用,采用ARM平台并嵌入Linux操作系统和基于CC2530的传感器节点,设计了一种基于ZigBee的嵌入式家庭网关。介绍了软硬件平台的搭建和软件设计的流程,最后实现家庭网关的功能。最终在实现了ZigBee与TCP/IP协议之间转换的同时实现了对家电的远程实时控制。实验结果表明,ZigBee技术在家电智能化方面有很大的优势。     

A Modular Wireless Sensor Platform With Fully Integrated Battery

This paper presents the design and development of a miniaturized, modular, system platform with fully integrated battery for wireless sensor nodes. It uses commercial off-the-shelf components and overcomes many of the limitations that attach to more conventional wireless sensor nodes based on planar vertical stacking of circuit boards. The platform is based around a plastic cubic framework that also acts as a receptacle for the battery. Six printed circuit boards (PCBs), interconnected with flex-PCB, are folded around the six faces of the cube, with two of the PCBs making contact with the two terminals of the battery. The sensor node architecture is partitioned in a modular fashion so that the main node circuit blocks (power, sensors, processing, and communications) are allocated to the individual PCBs on the six faces of the cube. Each of the PCBs has a common edge-connection layout, and each of the flex tapes joining the PCBs is identical in layout, giving a common ldquobusrdquo between the PCBs. This makes it easy to change any of the individual circuit blocks without having to redesign the whole system. The use of a cube also means that the sensors and antenna can each be on an external face of the node instead of being limited to the two external faces typical of planar vertical stacks. The functionality of the platform is verified by the design, assembly, and testing of a four-sensor environment sensing node working at 868 MHz.     

物联网中的窗帘远程控制系统设计

文章针对物联网中的家居控制问题,结合物联网发展现状,利用无线传感器、无线传输模块和安卓（Android）系统平台,搭建一个窗帘远程控制系统。Android应用界面可以控制电动窗帘的开合,根据传感器收集的光强度信息,系统也可自动控制窗帘。实验验证,该系统使用简单灵活,实现了窗帘的远程控制和自动控制,为人们的生活提供了方便,具有一定的应用前景。     

Design and deployment of a smart system for data gathering in aquaculture tanks using wireless sensor networks

The design of monitoring systems for marine areas has increased in the last years. One of the many advantages of wireless sensor networks is the quick process in data acquisition. The information from sensors can be processed, stored, and transmitted using protocols efficiently designed to energy saving and establishing the fastest routes. The processing and storing of data can be very useful for taking intelligent decisions for improving the water quality. The monitoring of water exchange in aquaculture tanks is very important to monitor the fish welfare. Thus, this paper presents the design, deployment, and test of a smart data gathering system for monitoring several parameters in aquaculture tanks using a wireless sensor network. The system based on a server is able to request and collect data from several nodes and store them in a database. This information can be postprocessed to take efficient decisions. The paper also presents the design of a conductivity sensor and a level sensor. These sensors are installed in several aquaculture tanks. The system was implemented using Flyport modules. Finally, the data gathering system was tested in terms of consumed bandwidth and the delay Transmission Control Protocol (TCP) packets delivering data from the sensors.