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Multipath Trust Based Framework for Prevention of Blackhole Attack in MANETs
Due to its self-organizing nature the Mobile Ad hoc NETworks (MANETs) are successfully able to provide a great channel for communication anywhere, anytime in absence of any centralized infrastructure and have a huge potential in actual applications like, in the military, rescue and commercial fields. However, due to its dynamic...
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In this paper, the authors present results of the studies aimed at development of new method for formation of signals for cognitive radio communication systems, which would allow increasing spectral efficiency of systems for data transmission as compared to the existing approaches. Signals which are used in cognitive radio communication...
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IPS - Indoor Positioning System with Wireless Sensors
Recent developments in the area of ubiquitous and pervasive computing emphasize the interest in context-aware applications. Location is probably the most important context. Indoor location estimation and tracking remains challenging due to the lack of usable and cost-effective technologies. GPS has proved itself for outdoor usage, but it is not...
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A Beamformer for 120-Degree Secterization in LTE Systems
A Long Term Evolution (LTE) technology is the most possible candidate for next generation mobile wireless communications. One impairment of LTE is an interference from neighboring cells, so called Inter-Cell Interference (ICI). A Fractional Frequency Reuse (FFR) has been proposed to handle the problem. Also lately, soft FFR technique has...
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Outage Analysis in Multi-User and Multi-Relay Cognitive AF Relaying Networks Using MRC
In this paper, the authors investigate the outage performance in multi-user and multi-relay cognitive amplify-and-forward relaying networks for MinW relay selection scheme over independent non-identically distributed Rayleigh fading channels, where the eavesdropper node may intercept the source message. To guarantee the quality-of-service of the Primary User (PU), both the maximum...
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Closed Form Delay/Doppler/Propagation Factor Acquisition for GPS Signals
In this paper, a delay/Doppler/propagation factor acquisition method for Global Positioning System (GPS) signal is proposed. Utilizing the Fast Fourier Transform (FFT) of the Auto-Correlation Function (ACF) for the received signal, together with some mathematical simplifications, a closed form solution is derived to estimate the delay/Doppler/propagation factor for the received...
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GPS signal Detection Method based on High Order Cyclo-stationarity (DMHOC) is the state-of-the-art method for acquiring the GPS signal under multiplicative and additive noise. However, since the method only uses autocorrelation function to obtain the peak and estimate the received signal frequency, the peak may be buried in the noise...
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QOSRGA Protocol Using Non-Disjoint Multiple Routes in Mobile Ad Hoc Networks
The problem of Quality of Service (QoS) routing for Mobile Ad-hoc NETwork (MANET) possesses several challenges that must be addressed. To select the most optimal route from source to destination, one has to choose from a set of routes with the corresponding quality of connectivity and resources. A rationale for...
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Cognitive Radio (CR) can improve the utilization of the spectrum by making use of licensed spectrum. However, the security aspects of cognitive radio networks have garnered little attention. In this paper, the authors discuss a threat to cognitive radio networks, which they call the Spectrum Sensing Data Falsification (SSDF) attack....
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In this paper, the conceptions of miniaturization of a 3D cubic antenna are presented and discussed. The miniature 3D cubic antenna is designed to operate in the UHF band (902-928MHz) (centered at 915MHz), produce a quasi-isotropic radiation pattern and have a miniaturized size which gives the authors a low cost,...
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