智能传感器节点的数据处理方案设计

针对嵌入式智能传感器节点数据并发处理问题,提出了DMA＋多进程／多线程的方法。利用DMA技术进行数据采集,利用多进程／多线程技术进行并发数据的处理。该方案充分利用了ARM微处理器的硬件资源和嵌入式Linux操作系统的特性,可以有效提高系统数据采集与处理的速度和实时性。     

3G和Wi-Fi融合分析系统的价值和实现

为使3G和Wi-Fi在业务和网络方面较好地协同发展,通过Wi-Fi有效分流3G数据流量,需要开发3G和Wi-Fi融合分析系统,以支撑Wi-Fi网络的建设、优化,分析Wi-Fi和3G用户行为,提高融合数据分析效率。本文阐明系统架构、关键技术和主要功能,实现3G和Wi-Fi融合分析系统,达到有效分流3G数据流量、提高用户感知、提升网络的整体性能和价值的目的。     

智能终端主流平台——Android的IPv6分析

Android平台作为目前非常热门的开源智能手机操作系统,已经风靡全球。其发展之迅速,大有不可阻挡之势。文章通过移植Android原始代码的实验板和已经上市的手机,从Wire Ethernet、Wi—Fi以及3G（EV—DO）三种上网方式的实验,比较深入地研究了Android从底层芯片到上层浏览器对于IPv6的支持情况,对未来Android终端厂商开发IPv6功能具有很好的参考意义。     

嵌入式无线视频小车的设计与实现

随着嵌入技术的飞速发展,各式各样的嵌入式系统应用已逐渐走进我们的生活。通过设计将嵌入式的特点应用在可移动小车架构上,满足了不同监控场合的灵活性需求。在三星S3C2440型ARM芯片上移植嵌入式Linux操作系统,修改I/O驱动程序来实现对小车的方向控制,加入无线传输模块实现视频和控制信号的远程传输。通过实践实现了视频画面的无线传输和小车的远程控制,为整个系统的开发打下了良好的基础。     

GSM900M频段的宽带接入技术

比较了现有的几种无线宽带接入方式，介绍了一种利用GSM900M频段采用OFDM调制技术来实现无线宽带接入的方案原理以及实际测试结果，并给出了此种方案的配置原则。     

Spatio-temporal adaptive indoor positioning using an ensemble approach

We present a fingerprinting-based Wi-Fi indoor positioning method robust against temporal fluctuations and spatial instability in Wi-Fi signals. An ensemble is created using randomized weak position estimators, with the estimators specialized to different areas in the target environment and designed so that each area has estimators that rely on different subsets of stable APs. When conducting positioning, we cope with spatial instability by dynamically adjusting the weights of the weak estimators depending on the user’s estimated location and cope with temporal fluctuations by dynamically adjusting the weights based on a periodic assessment of their performance using a particle filter tracker.     

Wi-Fi security evaluation model based on BP neural network

A Wi-Fi security evaluation model was proposed based on BP neural network.Firstly a large number of Wi-Fi hotspots was analyzed,safety information sources about wireless hotspots were selected.Secondly,a model of BP neural network was constructed,the weights were adjusted,and the evaluation system for Wi-Fi safety was formed,which was higher credibility.Finally,on the Android flatform the application based on above theory was designed.A lot of experi-ments show the model is able to scan and evaluate the wireless hotspot around user.It can also provide the disconnect function on unsafe wireless hotspot.     

无线网络中数据信息的安全性研究

无线网络在社会各领域的普及应用,给人们的工作和生活带来极大的便利。然而,无线网络上流动着大量的数据,其中包含着个人的隐私和企业的商业机密,如何在无线网络上有效地保护企业和个人的数据信息,是一个值得研究的课题。文章对Wi-Fi的安全性进行了探讨。     

农村WLAN建设发展探析

由于农村地区具有地形环境复杂和人口居住地较分散等特点,因此在农村地区的宽带网络建设中将遇到众多的新问题。针对农村地区的特点,提出采用WLAN进行农村宽带建设,探讨在农村地区建设WLAN过程中所采用的建设模式,经测试证明该建设模式提高了覆盖能力,提升了用户体验,设备可靠性稳定。     

WiFace: A Secure Geosocial Networking System Using Wi-Fi Based Multihop MANET

A number of mobile Online Social Networking (OSN) services have appeared in the market in recent times. While most mobile systems benefit greatly from cloud services, centralized servers and communications infrastructure is not always available. Nor are location-based services offered to mobile devices without GPS. To take advantage of cloud and to address these problems, a Wi-Fi based multihop networking system called MoNet is proposed. On top of MoNET we propose a privacy-aware geosocial networking service called WiFace. Where there is no infrastructure, a distributed content sharing protocol significantly shortens the relay path, reduces conflicts, and improves data availability. Furthermore, a security mechanism is developed to protect privacy. Comprehensive experiments performed on MoNet show that the system is more than sufficient to support social networking and even audio and video applications.