认知无线Mesh网络跨层设计研究

传统网络的分层设计不能满足具有特殊QoS需求的无线宽带业务,无法应对动态频谱接入的无线通信环境。采用联合开放、架构灵活的跨层设计研究无线Mesh网络接入技术日渐成为热点。本文首先介绍了跨层设计的起源、分类,然后分析了认知无线Mesh网络跨层研究的挑战、难点及最新进展,并提出利用跨层设计实现路由及频谱管理的一种构想,最后展望了认知无线Mesh网络跨层研究的新方向。     

GSM网络结构调整探讨

本文从设备能力、网络容量、网络覆盖、分流、频率复用等方面分析了转型期GSM网络存在的困境,给出了网络结构调整建议,阐述LTE网络初期规划与建设时期就应借鉴GSM网络的经验,避免不必要的重复投资。     

Petahertz communication: Harmonizing optical spectra for wireless communications

With the rapid deployment of Next-Generation Networks (NGN), the research community has initiated discussions on an entirely new suite of optical enabling techniques. To pave the way for the development of future wireless networks, this article aims to unify the existing infrared, visible light, and ultraviolet subbands while also exploring the potential of the Petahertz (PHz) band to support extremely bandwidth-thirsty telepresence style applications. Our focus is on the emerging Petahertz Communication (PetaCom) framework, scenario-dependent propagation channels, modulation schemes, system performance, multiple access techniques, and networking. We conclude with a range of PetaCom challenges and open research issues.     

60 GHz宽带无线通信射频芯片研究进展

60GHz无线通信技术由于其超高速的数据传输能力,将成为第4代无线通信技术的代表,引发了学术界和工业界研究热潮。近几年,随着半导体技术的发展,基于不同工艺的60GHz宽带无线通信射频芯片已经不断有报道。文中跟踪了近些年国外60GHz无线技术研究情况,分别从应用、技术特点、标准状况和芯片研究进展等方面介绍了60GHz宽带无线通信系统及其发展趋势。     

基于磁耦合共振传输技术的手机无线充电系统设计与研究

在社会经济与科技飞速进步的背景下,手机已经成为人们日常生活、工作中不可或缺的重要工具.无线充电系统能够较好地提升电能转化的效率,实现更加高效便捷的充电模式,应用磁耦合技术较好的摆脱充电线和充电接口的限制影响.文章系统性地介绍了磁耦合共振的工作原理和基本模型,结合手机无线充电的优势和现状,详细分析了该技术在充电系统中的设...     

无线光通信双幅度脉冲位置调制

无线光通信脉冲位置调制(PPM)的功率利用率虽然很高,但带宽需求也非常高,在无线光通信系统中,应当充分考虑带宽需求和功率利用率的平衡问题.针对该问题,提出了一种新的双幅度脉冲位置调制(DAPPM).在给出了其符号结构之后,分析了其带宽利用率.然后,推导了弱湍流信道模型下DAPPM的误时隙率和误包率,并与OOK、PPM、DPIM和DAPIM等调制方式进行了比较.结果表明,在相同的位分辨率条件下,DAPPM的误包率虽然高于PPM和DPIM,但明显优于OOK和DAPIM.同时,DAPPM去除了PPM中冗余的时隙,且平均长度比DPIM短,从而获得了比DPIM更高的带宽利用率.     

A Genetic‐Algorithm‐Based Optimized Clustering for Energy‐Efficient Routing in MWSN

With the increasing demands for mobile wireless sensor networks in recent years, designing an energy‐efficient clustering and routing protocol has become very important. This paper provides an analytical model to evaluate the power consumption of a mobile sensor node. Based on this, a clustering algorithm is designed to optimize the energy efficiency during cluster head formation. A genetic algorithm technique is employed to find the near‐optimal threshold for residual energy below which a node has to give up its role of being the cluster head. This clustering algorithm along with a hybrid routing concept is applied as the near‐optimal energy‐efficient routing technique to increase the overall efficiency of the network. Compared to the mobile low energy adaptive clustering hierarchy protocol, the simulation studies reveal that the energy‐efficient routing technique produces a longer network lifetime and achieves better energy efficiency.     

Miniaturized Flexible Electronic Systems with Wireless Power and Near‐Field Communication Capabilities

A class of thin, lightweight, flexible, near‐field communication (NFC) devices with ultraminiaturized format is introduced, and systematic investigations of the mechanics, radio frequency characteristics, and materials aspects associated with their optimized construction are presented. These systems allow advantages in mechanical strength, placement versatility, and minimized interfacial stresses compared to other NFC technologies and wearable electronics. Detailed experimental studies and theoretical modeling of the mechanical and electromagnetic properties of these systems establish understanding of the key design considerations. These concepts can apply to many other types of wireless communication systems including biosensors and electronic implants.     

基于无线网络的遥控视频监控车

监控是安防系统中应用最多的系统之一,视频监控现在是主流.现有的视频监控方式采用固定式摄像装置对图像进行捕捉并上传,但是这种固定式摄像装置的图像捕捉区域小,若是针对大范围或是复杂空间时,就需要通过广设摄像装置去实现针对该空间的监控,这样不论是在监控建设方面、还是成本方面,都是件不合理、不经济的工程.本设计采用Arduino为中心器件来设计控制主板,系统使用灵活、操作简单、监控范围广,可有效弥补传统监控方式中的不足.     

一种基于C8051F350的无线同步数据采集方法

设计了一种以C8051F350作为核心控制器,并配以无线通信模块的数据采集系统。介绍了系统无线数据传输中软件同步的设计及相关的处理,提出了一种通过多次测试、计算,获得数据在无线传输过程中产生的时间差,进行时间补偿后实现系统同步数据采集的方法。通过对同一信号进行多次测试,证明了该方法实现了数据的同步采集,为歼击机操纵杆／舵操纵力一位移性能检测评估系统提供了准确的测量数据。