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Optical wireless communication (OWC) has captivated an increasing interest in academia and industry recently with the widespread deployment of light emitting diodes (LEDs). OWC has been expected to be an appealing alternative to radio frequency (RF) systems due to its distinct advantages that include rich spectrum resources and high communication security. Orthogonal frequency division multiplexing...
Clustering is one of the recently challenging tasks since there is an ever-growing amount of data in scientific research and commercial applications. High quality and fast document clustering algorithms are in great demand to deal with large volume of data. The computational requirements for bringing such growing amount data to a central site for clustering are complex. The proposed algorithm uses...
With the advent of the space age, deep space exploration increasingly has become an important strategic task for human beings. To carry out space exploration, it is necessary to launch many space detectors with a variety of purposes, so that it requires establishing effective communication between the detector, and between the detectors and the Earth, that is to carry out deep space communication...
Data encryption has been widely applied in many data processing areas. Various encryption algorithms have been developed for processing text documents, images, video, etc. If we are able to collaborate the advantages of the different existing encryption methods, then a new hybrid encryption method can be developed which offers better security and protection. So, in order to accomplish the Hybrid encryption...
Now a days mobile handsets support both mobile and wireless LAN services. So we have to design an antenna that supports both these services. The antenna supports the Wimax and wireless local area network (WLAN). The antenna also supports a low specific absorption rate (SAR). The antenna consists of a monopole, a meander line and metamaterial structure. To cover the low frequency bands meander line...
Deep space communications have characteristics such as long delay, high code error rate and easily broken link etc. Easily broken links may lead to a certain degree of random flash break of Telemetry Tracking & Command signals, which in turn will result in the inconsiderable loss of data. Reliable downlink channel is necessary for deep space communication due to the distance between spacecraft...
Image Segmentation is necessary factor in the medical image processing. According to the current scenario of health care society, detection of brain tumor is a must. Automated brain disorder diagnosis with MR images is one of the challenging medical image analysis methodologies. Segmentation is used to separate the abnormal tumor portion in brain. These tumors are inhomogeneous, unsharp, and faint...
Many of the distributed environments like internets, intranets, local area networks and wireless networks have different distributed data sources. Inorder to analyze and monitor these distributed data sources specialized data mining technologies for distributed applications are required. A variety of distributed document clustering algorithms exists for this purpose. This paper presents an Enhanced...
With the increasing demand of wireless services, users expect better Quality of Service and performance. Quality of Service provides the level of assurance for the data delivery over the network. In this paper, to provide the best Quality of Service a seamless proactive vertical handoff scheme is used. The Vertical Handoff management scheme controls the Handoff process. Handoff procedures used in...
It is always desired to have high transmission rates over severe time-dispersive multi-path channels without usage of a complex receiver implementation. In this case the Multicarrier Code Division Multiple Access (MC-CDMA) is used which is a combination of conventional Code Division Multiple Access (CDMA) and Orthogonal Frequency Division Multiplexing (OFDM). Better BER performances are achieved by...
A secured Hierarchically Distributed Peer-to-Peer (HDP2PC) architecture and Clustering algorithm is used to overcome the scalability problem in structured peer to peer networks. It is possible to incorporate any number of layers of nodes. The architecture is based on a multilayer overlay network of peer neighbourhoods. Supernodes, which act as representatives of neighbourhoods, are iteratively grouped...
In modern wireless communication systems, a combination of multiple-input multiple-output (MIMO) system with the orthogonal frequency division multiplexing (OFDM) technique can be used to achieve high data rate and &better spectral efficiency. A Channel estimation technique using pilot carriers for multiple input multiple output( MIMO) systems for a Rayleigh fading channel is proposed in this...
In medical image processing segmentation of anatomical regions of the brain is the fundamental problem. Here, a brain tumor segmentation method has been developed and validated using MRI Data. In Preprocessing and Enhancement stage, medical image is converted into standard formatted image. Segmentation subdivides an image into its constituent regions or objects. This method can segment a tumor provided...
Overlay networks based on the P2P paradigm have been successfully employed to facilitate reliable data transport. They are used to improve the dependability of traffic flows between end-hosts without changing the underlying infrastructure. By observing connections between neighbours, the overlay can predict the statistical behaviour of the network and can thus select proper routes. In particular,...
A spectrally efficient OFDM transmission technique that does not require a cyclic prefix for combating intersymbol interference (ISI) is introduced. For achieving this, partial response coding (PRC) is combined with OFDM transmission scheme. PRC is regarded as one of the best known methods for combating ISI and for achieving the Nyquist signaling rate. In this paper the performance of OFDM system...
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