共查询到20条相似文献,搜索用时 125 毫秒
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主要介绍数字电视对山区覆盖的重要意义和利用数字电视这一高新技术在无线覆盖系统内实现公益性宣传和产业化运作的尝试 ,同时介绍了数字电视无线覆盖可能实施的两种技术方案。 相似文献
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电视发射机在推陈出新,数字电视发射机无线覆盖技术是一种新的技术手段,在一定程度上争取普及数字电视发射机无线覆盖技术,运用无线覆盖技术,让广大电视观众可以看到高清晰度、丰富多样的电视节目,进一步满足电视观众的实际精神要求。 相似文献
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对地面无线数字电视传输覆盖技术的特点、组网方式等进行了探讨,通过分析和比较,从而为各地地面数字电视无线覆盖的规划和发展提供参考。 相似文献
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数字电视无线覆盖技术是一种新兴的技术,文章对其进行了简要的理论性分析。通过数字电视发射机无线覆盖这种途径,让全国广大群众都能收看到高品质高清晰的电视节目,以满足精神上的追求。 相似文献
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代明刘骏高力曹志李国松高洋马小朴 《广播与电视技术》2015,(12):99-105
中央广播电视节目无线数字化覆盖工程将在全国建设地面数字电视覆盖网络,在各省采用单频网或多频网进行传输覆盖。本文主要介绍地面数字电视发射系统的测试与技术验收方法,主要包括地面数字电视发射设备出厂验收测试和发射台站的覆盖效果测试。 相似文献
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本文从对数字电视地面无线发射系统技术方案简析入手,对数字电视地面无线发射系统技术的方案构建要点,进行了重点的分析,并指出了数字化覆盖工程设计中应注意的细节. 相似文献
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蓝牙技术在数控系统实时数据传输中的应用研究 总被引:1,自引:0,他引:1
蓝牙是一种短距离无线通信技术,用于代替数字设备和计算机外设间的电统连接以及实现数字设备间的无线网络。在通信、网络、芯片、软件等,甚至消费类电器和汽车制造等方面得到了广泛的应用。但是在工业控制领域的应用还非常有限。研究如何将蓝牙技术应用于数控系统是非常有实用价值的,为实现控制方式的多样性提供了一种新的思路。本文详细阐速了蓝牙无线技术在实时数据传输系统中的应用,对蓝牙的特点及关键技术进行了理论的研究。并且最终实现了与控制系统间的无线实时数据传输。实验结果表明蓝牙无线传输系统能够正确、稳定地实现与数控机床的无线数据传输,而不会对机床运行产生任何干扰。 相似文献
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一种实用的蓝牙数控系统实时数据传输技术 总被引:1,自引:0,他引:1
蓝牙是一种短距离无线通信技术,用于代替数字设备和计算机外设间的电缆连接以及实现数字设备间的无线网络,在通信、网络、芯片、软件等,甚至消费类电器和汽车制造等方面得到了广泛的应用。但是在工业控制领域的应用还非常有限。详细阐述了蓝牙无线技术在实时数据传输系统中的应用,对蓝牙的特点及关键技术进行了理论研究,并最终实现了与控制系统间的无线实时数据传输。实验结果表明蓝牙无线传输系统能够正确、稳定地实现与数控机床的无线数据传输,而不会对机床运行产生任何干扰。 相似文献
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一个地级市有线电视网络,往往还有下属的县级网络或者无线覆盖网络。在数字电视运营中,由于区域不同,面向的用户群不同,这些网络传输的节目可能不完全相同。如果在地级市前端能够用一套EPG系统来描述不同网络的数字电视节目,这样不仅减少了前端系统设备的投入,也减少了平日节目单录入和维护的工作量。EPG系统的一个扩展功能多NIT能很好地解决这个问题。 相似文献
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概括说明数字用户线(xDSL)、无源光纤网络(PON)和光纤到路边(FTTC)、有线电视(CATV)和光纤同轴电缆混合(HFC)网、无线本地环路(WLL)和固定宽带无线接入(FBWA)4种用户接入方式。 相似文献
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地面无线数字电视系统是有线电视线路无法达到的区域覆盖方式的一种,其技术方案也有不同,系统建成后应可以提供标清电视业务、数字声音广播业务、多媒体广播和数据服务业务等。建设的方案要能尽可能地利用原有的各种资源,尽可能地缩减成本,设计方案是按照安徽广电信息网络股份有限公司的网络架构进行设计的。 相似文献
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Shu-ping Yeh Talwar S. Seong-choon Lee Heechang Kim 《Communications Magazine, IEEE》2008,46(10):58-65
Femtocells are viewed as a promising option for mobile operators to improve coverage and provide high-data-rate services in a cost-effective manner. The idea is to overlay low-power and low-cost base station devices, Femto-APs, on the existing cellular network, where each Femto-AP provides high-speed wireless connection to subscribers within a small range. In particular, Femto-APs can be used to serve indoor users, resulting in a powerful solution for ubiquitous indoor and outdoor coverage, using a single access technology such as WiMAX. In this article we consider a WiMAX network deploying both macro BSs and Femto-APs, where it is assumed that Femto-APs have wired backhaul such as cable or DSL and operate on the same frequency band as macro BSs. Simulation results show that significant areal capacity (throughput per unit area) gain can be achieved via intense spatial reuse of the wireless spectrum. In addition, Femto-APs improve indoor coverage, where the macro BS signal may be weak. Motivated by the gains in capacity and coverage offered by femtocells, we review the state of the art of this "infant" technology, including use cases and network deployment scenarios, technical challenges that need to be addressed, and current standardization and industry activity. 相似文献
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Donald C. Cox 《International Journal of Wireless Information Networks》1996,3(3):125-138
Several loop applications of wireless technology are aimed at reducing the cost of deploying communications services ranging
from telephone to wideband video. In these applications, wireless links replace a portion of a wireline loop from a central
location (a central office or cable headend) to a subscriber. The replacement of labor-intensive wireline technology by complex
mass-produced integrated electronics in wireless transceivers is projected to reduce the overall cost of the resulting loop.
These wireless loop applications attempt to provide existing communications services or small modifications to existing communications
services. A different interpretation of a wireless loop makes use of low-power digital radio technology to provide the last
thousand feet or so of a loop. Low-power low-complexity wireless loop technology in small base units can be integrated with
network intelligence to provide the fixed-infrastructure network needed to support economical personal communications services
(PCS) to small, lightweight, low-power personal voice and/or data communicators. Low-complexity communicators can provide
many hours of “talk time” or data transmission time and perhaps several days of standby time from small batteries (≤ 1.5 oz).
Because this application of wireless loop technology can reduce the inherent costs in several parts of a wireline loop, it
has the potential to provide convenient widespread PCS at less costs than providing telephone services over conventional wireline
loops. This low-power wireless loop application does not fit into any existing communications system paradigm. Wireless technology
with tetherless access and wide-ranging mobility, e.g., the personal access communications system (PACS), does not fit the
accumulated wisdom of the wireline telephony paradigm. It also does not fit the paradigm of existing cellular radio that has
sparsely distributed expensive cell sites, and it is not targeted at fixed video services as is wireless cable. Because a
significant change in thinking is required in addressing this new low-power low-complexity widespread wireless loop paradigm,
its large economic advantages and service benefits have not yet been embraced by many of the existing communications providers,
who appear to be more comfortable pursuing the better-known paradigms of video using wireless cable, or of cellular radio
in the guise of high-tier PCS, or in the guise of rapid economical deployment of telephone services in developing nations.
This paper discusses the inherent economic advantages and service benefits of low-power low-complexity wireless loop technology
integrated with network intelligence aimed at providing economical low-tier PCS to everyone. 相似文献