Abstract” In this paper we study the ˜service capacity™ of peer to peer (P2P) le sharing applications. We begin by considering a transient regime which is key to capturing the ability of such sys- tems to handle bursty trafc, e.g., ash crowds. In this context our models, based on age dependent branching processes, exhibit ex- ponential growth in service capacity, and permit the study of sen- sitivity of this growth to system policies and parameters. Then we consider a model for such systems in steady state and show how the avera ....etc

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SECURITY IN AD-HOC WIRELESS NETWORKS
Presented By:
Dr. D. Sreenivas Rao 1 A. Vani 2

1 E.C.E. Dept, J.N.T.U. College of Engineering, Hyderabad., (AP),India
2 E.C.E. Dept, J.N.T.U. College of Engineering, Hyderabad., (AP),India



ABSTRACT

Security is a major concern in the design of modern communication systems. It is articularly challenging with wireless networks such as Ad hoc networks. Ad hoc networks are dynamically reconfigured. For this reason they are vulnerable to several major sec ....etc

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Multiple-input multiple-output (MIMO) communication techniques make use of multi-element antenna arrays at both the TX and the RX side of a radio page link and have been shown theoretically to drastically improve the capacity over more traditional single-input multiple output (SIMO) systems . SIMO channels in wireless networks can provide diversity gain, array gain, and interference canceling gain among other benets. In addition to these same advantages, MIMO links can offer a multiplexing gain by opening Nmin parallel spatial chann ....etc

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We need Capacity of data collection in arbitrary wireless sensor network project report ....etc

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MIMO Wireless Channels: Capacity and Performance Prediction


Multiple-input multiple-output (MIMO) communication techniques make use of multi-element antenna arrays at both the TX and the RX side of a radio page link and have been shown theoretically to drastically improve the capacity over more traditional single-input multiple output (SIMO) systems . SIMO channels in wireless networks can provide diversity gain, array gain, and interference canceling gain among other benets. In addition to these same advantages, MIMO links can ....etc

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Seminar details on the topic:
MIMO Wireless Channels: Capacity and Performance Prediction
please send the information with necessary diagrams n figures ....etc

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Seminar on Wireless Ad hoc Sensor Networks



Solution: (Wireless) ad hoc networks

Try to construct a network without infrastructure, using networking abilities of the participants
This is an ad hoc network – a network constructed “for a special purpose”
Definition of the term « Ad Hoc Network »
Mobile ad hoc network (MANET), or simply ad hoc network, comprises nodes that freely and dynamically self-organize into arbitrary and temporary network topology without any infrastructure supp ....etc

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We present a new model for multiple input multiple-output (MIMO) out door wireless fading channels which is more general and realistic than the usual i.i.d. model. We investigate the channel capacity as a function of parameters such as the local scattering radius at the transmitter and the receiver, the distance between the transmit (TX) and receive (RX) arrays, and the antenna beamwidth sand spacing. We point out the existence of pinhole channels which exhibit low fading correlation between antennas but still have poor rank properties and hen ....etc

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Abstract—Data collection is a fundamental function provided by wireless sensor networks. How to efficiently collect sensing data from all sensor nodes is critical to the performance of sensor networks. In this paper, we aim to understand the theoretical limits of data collection in a TDMA-based sensor network in terms of possible and achievable maximum capacity. Previously, the study of data collection capacity , , , , , has concentrated on large-scale random networks. However, in most of the practical sensor ap ....etc

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Multiple-input multiple-output (MIMO) communication techniques make use of multi-element antenna arrays at both the TX and the RX side of a radio page link and have been shown theoretically to drastically improve the capacity over more traditional single-input multiple output (SIMO) systems . SIMO channels in wireless networks can provide diversity gain, array gain, and interference canceling gain among other benets. In addition to these same advantages, MIMO links can offer a multiplexing gain by opening Nmin parallel spatial chann ....etc

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