基于便携式PC 控制器的小型AGV 系统

针对传统火炮检测AGV系统存在的多车组网运行过程中安全距离较大、定位精度不高等问题,研制一款基于便携式PC控制的新型自动导引车(AGV).利用PC热点建立无线通信网络;基于Wi-Fi模组的AP&STA双模式,实现AGV的在线巡检;通过传感器信息融合的方式,完成AGV的位置及基于位置信息的自适应速度控制.现场测试结果表明:基于本设计的新型火炮检测AGV系统具有更高的紧密性与定位精度,且导航方式简易可靠、成本低,具有较强的实用性.     

一种基于多终端动态协同的室内定位方法

由于Wi-Fi环境的高动态性,当标定样本类稀少或者逐渐失去其原始价值时,将严重影响定位精度;若重新标定样本,又会带来大量人力物力投入,不利于实际应用。针对这一问题,提出了一种基于多终端动态协同的室内定位方法——OC-ELM。该方法利用环境中多个终端提供的Wi-Fi信息动态协同定位,并在每轮定位结束后及时更新样本库。实验结果表明此方法不仅能实现高精度定位,更重要的是避免了重复的标定工作,提高了实际应用能力。     

通过连接中心的智能无线整合将手机设计的潜力最大化

本文将探讨手机设计者可用技术的范围,以及智能IC设计如何改变无线整合的架构设计复杂性.     

一种基于蓝牙技术的室内强险救生定位系统

为了解决因反射等导致的信号延迟使普通无线通信与卫星难于用于室内定位，探讨了一类基于蓝牙技术的强险救生定位系统。剖析了室内定位存在的技术挑战，研究了实现室内定位的框架，设计了基于蓝牙技术的室内定位系统。以室内搭建的蓝牙技术定位平台实际测试进行验证，表明该定位系统有比较高的精度。实测数据研究表明:所设计的定位系统可以满足一般室内强险救生定位需求。     

电动通用飞机动力锂电池监控系统设计

目前电动力通用飞机机载动力锂电池组所用监控电路具有结构复杂、质量体积较大、采集精度较低、电路本身功耗太高等特点,这严重限制了锂电池在通用飞机上的应用。提出一种基于DSP的电动通用飞机动力锂电池监控系统设计,实现了对多节锂离子电池电压、电流、温度数值的采集与处理,并进行实时循环显示;从硬件和软件两方面提高采集精度;集成了SPI总线协议,可扩展多片采集模块;使用了Wi-Fi传输数据,减轻了质量和体积;采用大规模集成电路,减少了布线。     

Wireless broadband drivers and their social implications

Wireless local area networks now offer high-speed Internet access at numerous locations in both public and private environments. Associated with this rapid growth, numerous social implications come to the fore, especially relating to practices, such as the free use and sharing of bandwidth. Using case-based comparative analysis, we examine three primary strategies involved in providing wireless broadband access. Based on this research, we discuss the future of Wi-Fi growth, emergent competing technologies, and the broad social implications of this phenomenon.     

无线以太网和蓝牙在ISM频段的共存

在近距离的无线应用中,相互间的干扰是不同设备共存时值得考虑的问题。通过一些实验性数据简明地阐述了问题产生的根源及可能的解决途径。     

Dual band microstrip patch antenna array loaded with split ring resonators and via holes

Reduction in antenna size by using multi-band radiators play a vital role in the miniaturization of present world wireless handheld devices, as dual band behaviour of the antennas result in the integration of more than one communication standard in a single system and thus, saving the installation space required for separate antennas. In this context, this communication presents a shorted-pin dual band metamaterial inspired microstrip patch antenna array. Under the unloaded conditions, the traditional patch antenna array resonates at 5.8 GHz with gain of 9.8 dBi and bandwidth of 540 MHz. However, when each patch of this traditional antenna array is loaded with split ring resonator (SRR) and a metallic via hole is introduced in the patch, the same antenna array produces an additional resonant frequency in IEEE 802.11b/g/n 2.45 GHz Wi-Fi band with bandwidth and gain of 290 MHz and 5.6 dBi, respectively, while the initial resonant frequency (i.e. 5.8 GHz) gets shifted to IEEE 802.11ac 5 GHz Wi-Fi band, providing the gain and bandwidth of 11.4 dBi and 510 MHz, respectively. The proposed antenna array has been fabricated, and the measured results are presented to validate the proposed array. Moreover, the equivalent circuit of the proposed antenna array has been designed and analyzed to validate the simulated, measured and theoretical results. Attainment of dual band characteristics by incorporating the metamaterial with single band traditional patch antenna array makes this structure novel, as this has been achieved without any extra hardware cost, size and loss of structural planarity. Also, both the frequency bands of this proposed metamaterial inspired antenna array possess considerable gain and bandwidth.     

A method for throughput enhancement in Wi-Fi backscatter communications using power-level modulation

An improved data rate technology from tag to reader in Wi-Fi backscatter systems is proposed. The proposed system applies a power-level modulation to the conventional backscatter communication system. This technology can improve the data rate dramatically. It also adopts the Euclidean distance evaluation during demodulation, which looks for the most similar signal to enhance the BER performance. We analyze the error performance of the proposed decoding method, and the numerical results are presented. The power level is formed ranging from 2-level to 8-level. The performance of the detecting algorithm is compared to the conventional system, which utilizes the received power of selected sub-carriers.     

基于LPC2214的嵌入式智能家居控制终端的设计

为进一步提高家居生活的智能化和便捷化,文中设计了一款嵌入式智能家居控制终端。该终端以NXP（恩智浦）公司的ARM7TDMI处理器LPC2214为核心,集多款家电操控和状态监控界面于一体,通过扩展RF模块组建家庭内部无线网络。该终端既可以伴随相应的语音提示,通过按键进行家电操控界面切换和相应功能的选择及遥控,又可通过Wi-Fi模块接收由平板电脑或智能手机上家电控制软件下发的控制命令编码,最终实现对家电的遥控。同时,家电状态的变化也会实时反馈给控制终端、平板电脑或智能手机进行状态显示更新。该方案解决了对家电远程遥控和状态的实时监控问题。经过实验测试,该终端具备轻巧便携、控制精准、速度快等特点,非常适宜在智能家居系统中应用。