共查询到20条相似文献,搜索用时 359 毫秒
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随着越来越多的生产厂家加入蓝牙SIG,许多OEM厂家直接购买已经获得蓝牙认证的蓝牙芯片或模块,开发蓝牙产品,如移动电话、PDA、电脑、打印机、MP3播放器、数字相机等。由于产品类型不同,需要更换天线,或者由于其他无线模块或时钟模块的影响以及电源的变化,这些都会导致蓝牙最终产品的射频性能发生变化,因此在研发和生产过程中必须对该产品的射频性能进行测试,以保证其无线指标符合蓝牙射频规范的要求。安立公司推出了经济有效的蓝牙无线测试解决方案。蓝牙无线综合测试仪MT8850A蓝牙无线测试配置包括一台测试仪和被测设备(EU… 相似文献
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研制了一种无线激光通信系统,旨在满足在中等大气能见度下通信距离不小于25km
的应用。从理论计算上,核实了设计参数,证明本系统在理论上是可行的;而且经过外场实验测试,除大雾情况,在其他情况下达到预期效果。 相似文献
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基于ZigBee节点的智能家居系统语音控制设计 总被引:2,自引:1,他引:1
为实现基于S3C6410核心处理器与ZigBee技术的智能家居系统的语音控制,研究设计了基于SPCE061A单片机的ZigBee语音子节点。凌阳单片机SPCE061A能够进行语音信号的采集、处理以及语音识别,并与无线射频芯片CC2530之间通过串口进行通信。由语音识别系统以及ZigBee无线收发模块等所组成的语音子节点通过ZigBee无线网络与网关进行通信,通过网关来控制其他的ZigBee子节点。该系统实现了对开关型以及红外型家电的智能语音控制。该智能家居语音控制系统具有识别率高,控制使用方便等特点,有一定的发展前景。 相似文献
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Routing with Guaranteed Delivery in Ad Hoc Wireless Networks 总被引:14,自引:0,他引:14
We consider routing problems in ad hoc wireless networks modeled as unit graphs in which nodes are points in the plane and two nodes can communicate if the distance between them is less than some fixed unit. We describe the first distributed algorithms for routing that do not require duplication of packets or memory at the nodes and yet guarantee that a packet is delivered to its destination. These algorithms can be extended to yield algorithms for broadcasting and geocasting that do not require packet duplication. A byproduct of our results is a simple distributed protocol for extracting a planar subgraph of a unit graph. We also present simulation results on the performance of our algorithms. 相似文献
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在许多情况下。我们都希望所用的CPLD系统具有远距离无线通讯的功能,本文通过一种红外通讯编码方式使系统扩展成具有远距离通讯能力的系统。 相似文献
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Salonidis T. Bhagwat P. Tassiulas L. LaMaire R. 《Selected Areas in Communications, IEEE Journal on》2005,23(3):633-643
Bluetooth, a wireless technology based on a frequency-hopping physical layer, enables portable devices to form short-range wireless ad hoc networks. Bluetooth hosts are not able to communicate unless they have previously discovered each other through synchronization of their timing and frequency-hopping patterns. Thus, even if all nodes are within proximity of each other, only those nodes which are synchronized with the transmitter can hear the transmission. To support any-to-any communication, nodes must be synchronized so that the pairs of nodes, which can communicate with each other, form a connected graph. Using Bluetooth as an example, we first provide deeper insights into the issue of link establishment in frequency-hopping wireless systems. We then introduce an asynchronous distributed protocol that begins with nodes having no knowledge of their surroundings and terminates with the formation of a connected network topology satisfying all constraints posed by Bluetooth. An attractive protocol feature is its ease in implementation using the communication primitives offered by the Bluetooth Specification. 相似文献
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蓝牙接入设备的设计与实现 总被引:1,自引:0,他引:1
基于短距离无线通信问题的研究.为了使无线网络设备及有线网络之间能够方便有效地进行信息交换,利用新华龙公司的80C51F120芯片和蓝牙模块芯片BCM-05,文章设计一个蓝牙接入设备,使其能与各种现场设备进行数据通信.该设计的实现对家庭自动化,智能大厦及楼宇控制,办公室间通讯及计算机终端接口等实现通信具有一定应用价值. 相似文献
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Zhao Nan 《中兴通讯技术(英文版)》2008,(2):30-33
Wireless Mesh Network (WMN) is a new-type wireless network. Its core idea is that any of its wireless equipment can act as both an Access Point (AP) and a router. Each node in the network can send and receive signals as well as directly communicate with one or several peer nodes. One important issue to be considered in wireless Mesh networks is how to secure reliable data transmission in multi-hop links. To solve the problem, the 3GPP system architecture proposes two functionalities: ARQ and HARQ. This paper presents two HARQ schemes, namely hop-by-hop and edge-to-edge, and three ARQ schemes: hop-by-hop, edge-to-edge, and last-hop. Moreover, it proposes three solutions for WMNs from the perspective of protocol stock design: layered cooperative mechanism, relay ARQ mechanism and multi-hop mechanism. 相似文献
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Wireless Networks - A Vehicular Ad hoc Network is a model of mobile Ad hoc network for running vehicles in which vehicles can communicate with wireless communication devices within a confined... 相似文献