排序方式: 共有126条查询结果,搜索用时 15 毫秒
91.
A wireless solution for greenhouse monitoring and control system based on ZigBee technology 总被引:10,自引:0,他引:10
ZHANG Qian YANG Xiang-long ZHOU Yi-ming WANG Li-ren GUO Xi-shan 《浙江大学学报(A卷英文版)》2007,8(10):1584-1587
With the rapid development of wireless technologies, it is possible for Chinese greenhouses to be equipped with wireless sensor networks due to their low-cost, simplicity and mobility. In the current study, we compared the advantages of ZigBee with other two similar wireless networking protocols, Wi-Fi and Bluetooth, and proposed a wireless solution for green- house monitoring and control system based on ZigBee technology. As an explorative application of ZigBee technology in Chinese greenhouse, it may promote Chinese protected agriculture. 相似文献
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如何保证实时业务(如VoIP、AoD和VoD等多媒体业务)的服务质量是目前无线通信领域的一个重要课题。本文概述了现有的IEEE 802.11中服务质量支持机制,包括基于 MAC层的区分服务机制、基于MAC以上层的接纳控制和带宽预留机制等,对实现复杂性、兼容性和资源利用率等进行了简要分析。 相似文献
94.
麻书钦 《广东职业技术师范学院学报》2011,(9):19-23
随着无线网络的迅速发展和日益增加的移动办公需求,无线网络逐渐成为不少高校信息化网络的重要组成部分,本文介绍了无线网络的技术标准以及智能无线校园网络的部署探究,从而使用户智能安全的接入和使用无线校园网络. 相似文献
95.
高速无线局域网信道差错控制研究 总被引:1,自引:0,他引:1
沈乐 《广东技术师范学院学报》2005,(6):37-40
为了解决无线局域网传输差错多、信道时变性强的问题,本文提出了高速无线局域网信道FEC纠错的基本方法,并对其信道的自适应差错控制机制进行了深入的研究,着重对IEEE802.11b现有的重传纠错机制进行改进,加入了FEC纠错,并对传输信道的可靠性与吞吐量进行了研究与仿真. 相似文献
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Zigbee协议栈及应用实现 总被引:2,自引:0,他引:2
Zigbee是基于IEEE 802.15.4的一种新兴的无线网络技术.在介绍Zigbee协议栈的架构,每层协议的参考模型及各层的帧结构的基础上.提供了目前应用广泛的两种基于Zigbee的解决方案,即freescale和Chipcon的Zigbee解决方案. 相似文献
97.
A clock synchronization method based on IEEE 1588 and its implementation on Ethernet 总被引:1,自引:0,他引:1
We presented a clock synchronization method that contained a clock adjusting algorithm and a frequency compensated clock to achieve precise synchronization among distributed clocks based on IEEE 1588 protocol. Further, we presented its application on Ethernet and implementation of the frequency compensated clock in a field programmable gate array (FPGA) as experiments. The results indicate that this method can support sub-microsecond synchronization with inexpensive standard crystal oscillators. 相似文献
98.
程锐 《中国教育技术装备》2008,(20)
对当今主流的e—learning规范与标准进行较全面地介绍,并对其中最具有影响力的几种进行详实的论述与深入的分析。 相似文献
99.
朱小刚 《绵阳师范学院学报》2007,26(8):123-128
介绍最新的总线标准IEEE1451,该标准定义了网络适配处理器(NCAP)和智能传感器接口模型(STIM),为研究解决通用智能传感器的设计开发问题提供了一个可以共同遵循的基础,使得智能传感器的即插即用成为可能;文中根据IEEE1451.2模块TMI1451.2-SC平台,结合实际监控领域的要求,设计和配置了网络化智能传感器的电子数据表单(TEDS)。 相似文献
100.
Jázef LUBZCZ 《浙江大学学报(A卷英文版)》2008,9(10):1309-1317
This paper presents an analytical saturation throughput model of IEEE 802.11DCF (distributed coordination function) with basic access in ad hoc mode. The model takes into account freezing of the backofftimer when a station senses busy channel. It is shown that taking into account this feature of DCF is important in modeling saturation throughput by yielding more accurate and realistic results than models known from literature. The proposed analytical model also takes into account the effect of transmission errors. All essential features of the proposed analytical approach are illustrated with numerical results. The presen- tation of the model is proceeded by an overview of approaches to IEEE 802.11 network performance evaluation presented in the literature. 相似文献