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Nowadays due to the increase in demand for various multimedia services requiring high capacity, shortage of wireless resources becomes a serious problem in cellular networks. It is difficult to suddenly increase the capacity of wireless communication networks because of high cost and complexity. In order to increase the capacity of wireless communication networks with minor changes and low cost, internetworking...
Wireless Sensor Networks have gained much attention in recent applications. However, they are very much subjected to the security threats. To provide security arrangements in sensor nodes, the energy required to carry out the operation may reduce the life time of the sensor nodes. In order to optimize the energy usage in sensor nodes, Middleware concept is introduced. The Middleware to provide security...
The combination of multiple antennas and multicarrier code division multiple access (MC-CDMA) is a strong candidate for the downlink of future mobile communications. The study of such systems, in scenarios that model real-life transmissions is an additional step towards an optimised achievement. Channel estimation is employed to improve its performance by characterising the channel. In this paper...
This work describes the strategies to improve the channel quality indicator (CQI) for multi-state channels in 802.16e (wimax) based systems. The method includes the use of Exponential effective SNR mapping (EESM) method as part of the modulation/coding selection process and the problems associated with this technique has been studied. MI-ESM (Mutual Information based Effective SNR mapping) SNR metric...
Implementation of particle swarm optimization (PSO) application for solving the optimization problem in the field of electric power system is proposed. PSO is a powerful tool for optimizing multidimensional discontinuous nonlinearity problems. The optimization problem in power system like minimization of energy capacity of a dynamic voltage restorer is identified and analyzed in the proposed work...
Wireless sensor networks (WSNs) have emerged as an interesting research area in the last few years. The applications envisioned for such networks require collaborative execution of a distributed task amongst a large set of sensor nodes. The collaborative execution is realized by exchanging messages that are time-stamped using the local clocks on the nodes. Hence, time synchronization becomes indispensable...
Dynamic Source Routing (DSR) Protocol is a commonly applied reactive protocol for mobile ad hoc networks (MANETs). When the network size is increased, overhead is increased due to the source routing nature of DSR. Moreover, energy consumption of the nodes increases, as the nodes act as intermediate nodes for many source destination pairs. In order to improve the scalability of DSR, in this paper,...
The reactive dynamic source routing (DSR) protocol is a commonly applied protocol in mobile ad hoc networks ( MANETs). When the network size is increased, it is observed that the overhead is also getting increased due to the source routing nature of DSR and this in turn reduces the efficiency of DSR protocol. In order to improve the scalability of DSR,in this paper, a modification is proposed for...
Mobile ad hoc networks (MANETs) are multi-hop wireless networks where all nodes cooperatively maintain network connectivity. When the nodes are highly mobile and the size of the network is large the frequency of link failure is increasing. Link failure is identified only during the transmission of data packets. Due to this, latency and control load of the network is increasing. In this paper, an adaptive...
This paper presents an efficient and reliable particle swarm optimization (PSO) method for the economic load dispatch (ELD) problems. The PSO method was developed through the simulation of a simplified social system and has been found to be robust in solving continuous nonlinear optimization problems in terms of accuracy of the solution and computation time and it can out perform other algorithms...
WATM Networks support several types of traffic stream including data, voice and video with different QoS requirements. Due to the effects of fading, multipath propagation and interference, the wireless link is characterized by a higher and more variable error rate. This has necessitated error control coding for WATM networks in order to insulate the ATM network layer from wireless channel impairments...
The code-division multiple-access (CDMA) scheme has been considered as one possible choice of the future standards for cellular networks because of its various advantages. Since there can be only one carrier frequency being used in CDMA systems, a handoff scheme with diversity, a so-called “soft handoff,” was proposed for higher communication quality and capacity. Unlike the reverse link, soft handoff...
Multicarrier communication systems with adaptive modulation and coding systems such as ofdm are well suited for high speed and mobility oriented networks like mobile wimax that has to support users in different fading and mobility conditions. The channel estimation and link prediction are worked out at different levels. These estimators and predictors are normally examined using complex emulators...
High overhead is a limiting factor of Dynamic Source Routing(DSR) protocol applied for mobile ad hoc networks(MANETs).In this paper, a modification is proposed for basic DSR to enhance its performance. In the modified- DSR(MDSR), for a source destination pair, the destination responds to the first received route request packet(RREQ) with a route reply packet(RREP), and the subsequently received RREQs...
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