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Transcoding is an inevitable need that is highly required for the current communication system like telemedicine, education, etc. However, it is not devoid of challenges that occur during retrieval end of format incompatibility. Apart from the massive research work in past on designing efficient transcoder architecture, quality of image resolution in wireless media is found to be quite challenging...
Worldwide interoperability for microwave access (WiMAX) brings additional features that can be utilized for enhancing positioning accuracy. This paper deals with WiMAX positioning scheme based on the first arrival path (FAP) of the time of arrival (TOA) technique by utilising one of WiMAX offered features i.e multiple input multiple output (MIMO) system. Simulation results show that the performance...
Data offloading is a method to significantly improve network capacity. Offloading of data from macro-cells to pico-cells helps to ease capacity demand in hotspot areas where user distribution is dense and often demanding high bandwidths per user. This study uses a heterogeneous network using combined Long Term Evolution — WiFi IEEE 802.11n coverage to improve the capacity performance of the network...
Implementation of high performance, low-latency cooperative collision avoidance (CCA) protocols for Vehicular Ad hoc NETworks (VANETs) is of major importance for public safety organizations and automobile manufacturers. In this study, we examine a vehicle-to-roadside (V2R) transmission scheme in which the intermediate roadside terminal amplifies and forwards the broadcasted warning signal and acts...
Radio resource partitioning is a vital feature that ought to be considered to further enhancing the overall performance of the Orthogonal Frequency Division Multiple Access (OFDMA) system. Radio resources can be allocated in either time domain or frequency domain in OFDMA system. As the emergence recent technologies such as femtocell, which is it underlay the macrocell network, the users fairness...
After a disaster, the destruction of the infrastructure strike raises the sudden need of an mobile ad hoc network. Abbreviated as MANET, is a system of wireless mobile nodes that can freely and dynamically self-organize in temporary network topologies without the need of a wired backbone or a centralized administration. The objective is to investigate the performance metrics of a mobile ad hoc network...
In web service oriented architecture, web services are available in specific registers and described using Web Service Description Language (WSDL). Users or application developers ask these registers to discover the needed services. When the existing services don't meet user's requirements, they must be composed to offer new functionalities. In the last decade, many languages have been proposed to...
The aim of the present work is to present the characterization of OR logic based on SOA-NOLM. Three input states were being analyzed. Numerical simulation was also studied in the way of effect of semiconductor optical amplifier (SOA) on the gain, polarization state and extinction ratio. The effect of time delay and polarization also been analyzed.
A stochastic gradient adaptation(SGA) of antenna array receiver in DSSS system is proposed in this article, the beamformers are updated by using the perturbation vector that gives the largest correlator output, and the chip-phase delay of PN code is estimated by maximizing the output of matched filter at the same time. The beamformed signal power is maximized without jammer input, and the signal-to-interference-plus-noise-ratio...
Machine-to-Machine (M2M) communication in cellular network is the driver for the future Internet of Things (IoT). The main challenge of M2M communication is the possibility of huge traffic in the uplink network that can cause problem in the network. This paper considers the problem of resource allocation among machines connecting in uplink to different femto base stations (FBSs). Resource allocation...
This paper focuses on spectrum handoff where cognitive user can returns the spectrum to demanded licensed user. Besides, the cognitive user can chooses to adjust its transmission power with sufficient protection to licensed user instead of carry out spectrum handoff. Using our proposed scheme, cognitive user switches between the bands if and only if it is unable to modify its transmission power within...
MIMO-OFDM is known for its novelty and capability for higher data rate transmission and has been an effective multicarrier transmission technique over frequency selective channels. However, its vulnerability to frequency offset (FO), has wiped out the orthogonality of the subcarriers and lead to inter-carrier interference (ICI) which degrades the system performance. The system performance will also...
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