排序方式: 共有81条查询结果,搜索用时 140 毫秒
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技术标准化中的公司专利战略--以Motorola为例 总被引:3,自引:0,他引:3
高科技的发展使得标准与专利之间的关系正在逐步发生变化。以GSM移动通讯标准为例,研究了标准与专利之间关系由冲突走向协调的演进过程,以及在其中发挥重要作用的Motorola公司专利战略, 相似文献
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浅析远程监控的数据传输 总被引:3,自引:0,他引:3
文章论述了远程监控系统数据传输技术的重要性以及常用的几种实现方式,并对其优缺点进行了比较和分析。文中分析了利用全球移动通信系统(GSM)进行数据传输的优越性,并介绍了GSM传输的3种方式的特点,各自的实现方式,最后展望了远程监控数据传输的发展前景。 相似文献
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马锋 《中国高新技术企业评价》2007,(13):102-102,105
文章主要介绍GSM/TD-SCDMA系统互操作的原则和策略,分析与总结了GSM/TD-SCDMA网络共存的可行性,提出基于成熟GSM网络的TD-SCDMA网络部署建议,减少投资并快速实现3G商用服务的运营目标。 相似文献
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在广义空间调制(GSM)系统中,最大似然(ML)检测可以取得最优的检测性能,然而其计算复杂度随激活天线数的增加急剧增长。针对这一问题,提出了一种基于稀疏重构理论的低复杂度检测算法——正则化正交匹配追踪(ROMP)算法。该算法首先根据信道矩阵和当前残差的内积选取多个候选激活天线索引,接着对候选天线索引按正则化标准进行可靠性验证,剔除错误索引,缩小信号的搜索空间,最后通过求解最小二乘问题估计信号。仿真结果表明,与经典的正交匹配追踪(OMP)算法相比,所提算法以少许复杂度的增加为代价极大提升了检测性能,能够在检测性能与复杂度之间取得更好的折中。 相似文献
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进入21世纪,手机成为人们不可或缺的联系工具,它不但体积小方便携带,只要由网络覆盖的地方都能实现GSM短信息通讯。GSM短信息灵活方便,可以跨市、跨省、甚至跨国传送,而且短信息非常可靠廉价。因此发射机利用短信息来实现遥控遥测、传输数据是一个非常实用的方案。目前该技术已经在工业测量等领域广泛应用。 相似文献
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The wireless industry is one of the most capital intensive high-technology industries. This paper applies real options techniques to estimate investments under uncertainty in two new ventures: (a) deferral of the expansion from 2.5G to 3G networks; and (b) expansion of a 2.5G network using Wi-Fi as an alternative technology. The cases are examined and analyzed both qualitatively and quantitatively, using realistic assumptions and parameters. Investment cost, number of subscribers, pricing of services, and risk are at the core of investment decision processing. In both cases, sensitivity analysis of the value of the (real) option considering the above key parameters was conducted, to extrapolate useful findings that should be taken into consideration by the decision makers in wireless companies. 相似文献
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George P. Boretos Author Vitae 《Technological Forecasting and Social Change》2007,74(3):331-340
One of the fastest growing technologies of our times is that of mobile phones. In this article we use the assumption that the diffusion of mobile technology, as measured by the number of active mobile accounts, follows the well known S-curve of natural growth in competition systems. The accuracy of the logistic fit is tested against actual data for the whole world, Europe, China and the GSM system. Using the produced models predictions concerning the future of mobile business are deliberated.According to these models active mobile accounts around the globe are expected to grow from 1.7 billion in 2004 to approximately 2 billion in 2008, reaching a peak penetration of 29.2%. Growth barriers, apart from the age of the potential user, are also low income and extreme poverty. Europe, early adopter of mobile technology and leader in active mobile accounts against all other regions in the world, has apparently reached a peak with almost every European, apart from the very young or very old, using a mobile phone. The mobile market in China is anticipated to exceed 500 million active accounts and may increase even further depending on the economic and social reform that is currently under way in that part of the world. GSM will most likely remain the leading mobile technology in the future as it is today.The growth process for the world, Europe, and the GSM system is almost completed and during this stage instabilities may occur before the potential emergence of a new wave of growth. 相似文献
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GPRS(通用无线业务)技术是为了满足现有的GSM网络实现与高速数据分组的简便接入而兴起的一门新技术。文章系统分析了GPRS的组成结构及特点,研究了其主要的技术实现。 相似文献
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基于手机办公模式的电子政务的研究 总被引:1,自引:0,他引:1
全球性的信息化、网络化进程正在改变着人们的生活和工作方式.传统的办公模式已经不能紧随信息的飞速发展,时间和空间越来越成为移动办公的障碍.为此提出的手机办公模式在一定程度上解决了该问题,通过设计和实现手机的短信模块,可以实现移动办公,为电子政务的发展起到了推动作用. 相似文献