Current Issue : October - December Volume : 2014 Issue Number : 4 Articles : 5 Articles
In this paper we are going to briefly discuss about wireless communication and mobile or cellular technology. As the word suggest term “WIRELESS” means having “NO WIRES”. Communication is done without use of any cables via radio waves known as electromagnetic waves. Cellular technology which evolved from 1G, 2G, 3G, 4G to upcoming 5G in next few years. We are going to discuss about this wireless mobile Technology and comparative analysis of it....
An improved DV-HOP localization algorithm is\nproposed based on the traditional DV-HOP localization algorithm\nin the paper. There will be a big error that using the\nnearest anchor node�s average hop distance instead of the\naverage hop distance of all the anchor nodes that involved in\nthe localizing in the traditional DV-HOP localization algorithm.\nTherefore, the improved algorithm introduces threshold\nM, it uses the weighted average hop distances of anchor\nnodes within M hops to calculate the average hop distance\nof unknown nodes. In addition, the positioning results\nare corrected in the improved algorithm. The simulation results\nshow that the new localization algorithm effectively\nimproves the positioning accuracy compared with the traditional\nDV-HOP localization algorithm, it is an effective\nlocalization algorithm in the wireless sensor networks....
The tendencies of the contemporary communication systems development are characterized by\nthe increasingly stringent requirements for maximum channel utilization. Considering discrete\ncommunication systems in channels with intersymbol interference identification with the use of\ntraining signal is the key technology to create various types of equalizers. However, the time (from\n20% to 50%) spent on training signal is increasingly attractive resource for upgrading standards\nTDMA, especially in mobile systems. An alternative method to training signal is blind signal processing....
Overlay networks employ underlying network\ntechnologies in order to provide end-system related communication\nand over the years overlays have been getting\nmore and more attention in research community and in business\nworld as well. Since overlays tackle many drawbacks\npresent in pure ââ?¬Å?link-router-networkââ?¬Â engineering, they have\nbecome an excellent solution for multimedia-oriented applications.\nA good example comprises multicast communications,\nwhere an overlay system, in contrast to IP Multicast,\neliminates many issues related to scalability or management\ncontrol. This paper focuses on modeling and optimization\nof overlay multicast networks aimed at realizing maximum\nthroughput with survivability constraints, where survivability\ndefines the ability of a multicast system to limit potential\nthroughput losses in case of a failure of single virtual\nlink. We present linear formulation derived from fractional\ntree packing problems based on predefined topologies which\nmay route multicast traffic. Linear model might be used for\nobtaining optimal multicast structures, however its applicability\nis limited by increasing sizes of networks. Hence, we\nalso design and evaluate heuristic searches dedicated to optimization\nof maximum flow survivable overlay multicast\nnetworks....
There are millions and billions of cell phone users worldwide. But, how many of us truly know the real technology responsible behind cell phones which is being used for communication? The paper has included about the type of technology used in today smart phone. 5G technologies haven’t been launched officially, but it would definitely be including the keen features of the latest 4G technology and its IMT advanced system. That will bring a complete breakthrough in the mobile systems with new changing technologies and lots of amazing designs. The futuristic 5G may include innovative concepts of multiple paths for the corresponding and appropriate data transfer. The data transfer rate is not inveterate for 5G technology....
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