نتایج جستجو برای: radio and tv networks
تعداد نتایج: 16922542 فیلتر نتایج به سال:
Keywords: TV white space Cognitive radio Medium access control Survey Open research issues a b s t r a c t The opening of TV white space (TVWS) bands for cognitive access is one of the first tangible steps to solve spectrum scarcity problem in current wireless networks. However, this has also raised many new challenges to efficiently use the TVWS spectrum. One of the primary challenges is the d...
This demonstration shows how VESNA wireless sensor nodes can be used for cognitive radio experiments involving wireless sensor networks. SNE-ISMTV is a radio frontend that has been developed for this purpose. Spectrum sensing capability in the TV white-spaces and 2.4 GHz ISM band is demonstrated by running receivers in a swept-tuned spectrum analyzer configuration and displaying measured spectr...
Many appealing multicast services such as on-demand TV, teleconference, online games and etc. can benefit from high available bandwidth in multi-radio multi-channel wireless mesh networks. When multiple simultaneous transmissions use a similar channel to transmit data packets, network performance degrades to a large extant. Designing a good multicast tree to route data packets could enhance the...
rivers and runoff have always been of interest to human beings. in order to make use of the proper water resources, human societies, industrial and agricultural centers, etc. have usually been established near rivers. as the time goes on, these societies developed, and therefore water resources were extracted more and more. consequently, conditions of water quality of the rivers experienced rap...
In today’s challenging world, and so in the Middle East, TV series as the cultural products have found a extensive and effective cultural diplomacy function. Among the countries in the region, Turkey and Saudi Arabia, with TV series in various genres, have been able to stabilize their position and influence among the satellite television networks. Hence, the basic aim of this paper is to analyz...
With integration of software routers with embedded platform we can get the most modern routers, but with less price. TV and radio services over IP networks become available just when multicast routing is used. Multicast routing is currently feature only on expensive hardware solutions. XORP open-source platform offers multicast routing through a software router, with the possibility of integrat...
today, scouring is one of the important topics in the river and coastal engineering so that the most destruction in the bridges is occurred due to this phenomenon. whereas the bridges are assumed as the most important connecting structures in the communications roads in the country and their importance is doubled while floodwater, thus exact design and maintenance thereof is very crucial. f...
Cognitive radio (CR) paradigm was introduced, towards addressing challenges, related with radio spectrum scarcity and increased needs for wireless networking services provision. In this direction, CR networks exploit novel networking architectures, as well as dynamic radio spectrum access techniques and methods, alleviating problems, regarding limited wireless networking resources and their ine...
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