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内嵌TCP/IP协议的CDMA无线终端 总被引:2,自引:0,他引:2
介绍基于CDMA无线终端的TCP/IP协议实现。从CDMA无线数据通信的应用背景和应用特点出发,介绍CDMA无线终端TCP/IP协议的特殊结构,阐述应用层网络程序的开发原理,并给出实际应用系统原理及实现方法。 相似文献
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主要介绍了无线定位在CDMA网络中的具体实现方法。分析了CDMA无线定位技术及CDMA无线定位业务的网络结构。 相似文献
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针对采用天线作为CDMA无线通信系统覆盖设备时存在信号绕射及穿透能力较差,在弯曲度及高低起伏大的巷道无法保证无线信号的覆盖距离及信号质量,无法随意增大矿用CDMA基站发射功率来满足无线覆盖要求的问题,提出了一种利用漏泄电缆进行井下CDMA无线信号覆盖的解决方案。该方案中,井下CDMA基站输出的射频信号通过二功分器连接到漏泄电缆,可实现巷道的无线信号覆盖。实际应用表明,采用该方案信号覆盖稳定,通信效果良好。 相似文献
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《微计算机信息》2000,(3)
随着信息运营商和网络服务提供商把无线服务提供给用户,空中数据革命将会波及到每个人,商家部署自己的无线网络,个人也把家里的电器设备连接成无线PAN或住宅区局域网。无线广域网OVWAN):考虑一下Internet访问和WWAN。现在语音无线电话已经流行开来了。SPrint通讯公司已经开始建设第一个基于CDMA(码分多址访问)的国家级无线数据网络。SPrintPCS无线Web使用T3Com的CDMA交互作用功能(IWF)网关,可以容纳四百万SPrintPCS服务用户。除了电路交换式CDMA之外,可以支持最高64KPs无线速率的新一代色交换式CDMA也就要迎… 相似文献
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介绍了基于ZigBee和CDMA技术结合的智能家居系统的软硬件结构设计方案,系统以CC2530为核心控制器,利用ZigBee的无线自组网络的通信方式和3G通信网络CDMA技术,实现了智能家居系统本地与远程的无线监控系统设计。 相似文献
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基于TDMA与CDMA混合的传感器网络MAC协议 总被引:1,自引:0,他引:1
MAC协议是保证无线传感器网络正常运作、高效通信的关键。无线传感器网络的无线信道分配机制主要有随机竞争机制、TDMA机制、FDMA机制以及CDMA机制。基于随机竞争的MAC协议存在空闲侦听和数据碰撞等能耗问题;基于I'DMA和FDMA的MAC协议存在扩展性差的问题;基于CDMA则存在较多额外能耗开销的问题。在分析纯"I'DMA、纯CDMA和TDMA/CDMA混合的能耗模型的基础上,提出了一种基于分簇的TDMA/CDMA混合的HCT-MAC协议,它较好地解决了低时延和冲突干扰问题,其簇内节点采用们)MA机制进行信道分配,避免碰撞串扰问题,从而实现低延迟快速上传数据;簇首节点则采用CDMA机制,避免多跳同步问题,增强可扩展性。 相似文献
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This article describes the rationale for the multiphase creative problem solving process, and reports the findings from an empirical investigation conducted to facilitate the problem solving of managers. The ideational skills of the managers were assessed before and after training in a complete process of creative problem solving, along with their ideational attitudes, creative problem solving style (i.e., generator, conceptualizer, optimizer, or implementor), and evaluative skill (i.e., ability to recognize original ideas). The most important findings indicated that the training had a significant impact on the evaluative accuracy of the managers. They were significantly more accurate in their judgments about original ideas after training, both in their identification of original ideas and their recognition of unoriginal ideas. After training, the managers also gave more solutions and more original solutions to problems. Finally, several variables (e.g., the “preference for active divergence” attitude, and the conceptualizer process style) seemed to moderate the impact of training. Training was therefore effective, with specific effects that can be predicted from pre-training individual differences in attitudes and process style. 相似文献
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为发现我国国家标准与国外发达国家标准法规的差距,从根本上提高我国国家标准的总体质量,提升我国产品的质量安全水平,以关键指标(因子)为核心,研究国内外标准法规比对的工作流程,利用面向对象的方法设计,实现了国内外标准法规比对分析系统。该系统适用于所有产品国内外标准法规的比对工作。 相似文献
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为提高高等院校的管理水平和决策水平,充分利用校园网资 源,开发了高等院校行政财政分析与决策系统。解决了诸如数据的动态查询、自动生成报表 、网络环境下数据共享等技术问题,具有网上数据共享、图形界面友好和安全的保密措施等 特点。 相似文献
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Mark A. Reynolds 《Nexus Network Journal》2001,3(2):147-150
Geometer Marcus the Marinite explores how the geometric and harmonic means can be employed compositionally within a frame;
how means function in the development of organizational field grids; how means work to develop linear perspective and proportional
grids. 相似文献
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Goldman DB 《IEEE transactions on pattern analysis and machine intelligence》2010,32(12):2276-2288
We discuss calibration and removal of "vignetting" (radial falloff) and exposure (gain) variations from sequences of images. Even when the response curve is known, spatially varying ambiguities prevent us from recovering the vignetting, exposure, and scene radiances uniquely. However, the vignetting and exposure variations can nonetheless be removed from the images without resolving these ambiguities or the previously known scale and gamma ambiguities. Applications include panoramic image mosaics, photometry for material reconstruction, image-based rendering, and preprocessing for correlation-based vision algorithms. 相似文献
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