Communication is a crucial part and, often, a thorny problem of organizational life. In the modern-day organization, individuals must exchange information continuously and rapidly throughout the chain of command, whether to offer evaluation, direction or control. No more is this true, then for the rapidly growing and evolving domain of IT governance. Unfortunately, communication failures between business and…
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Architecting space communication networks under mission demand uncertainty
NASAs Space Network has been a successful program that has provided reliable communication and navigation services for three decades. As the third generation of satellites is being launched, alternatives to the current architecture of the system are being studied in order to improve the performance of the system, reduce its costs and facilitate its integration with the…
Impact of Primary Network on Secondary Network With Generalized Selection Combining
We propose cognitive spectrum sharing with generalized selection combining (GSC) at the secondary user (SU) in the presence of multiple primary transceivers with outdated channel information. Our main motivation is to determine the impact of GSC and outdated channel information on the outage probability of cognitive spectrum sharing subject to two practical power constraints: 1) maximum transmit power at…
Opportunistic relaying with wireless energy harvesting in a cognitive radio system
In this paper, the performance of opportunistic relay selection (ORS) in a cognitive radio is analyzed over flat Rayleigh fading channels. Data transmission between source and destination is assumed to be entirely performed via the relays. Relay nodes are assumed to have ability to harvest energy from the source signal and use that harvested energy to forward the…
crSimulator: A discrete simulation model for cognitive radio ad hoc networks in OMNeT ++
Cognitive Radio is an exciting new technology for efficient use of radio spectrum. Research oncognitive radio has for a large part, focused on physical layer issues such as robust spectrum sensing and radio environment characterization. The networking of cognitive radio nodes is equally important however as new protocols need to be developed to cope with physical layer dynamics. The lack of a widely used and open source simulation…
Engaging citizen communities in smart cities using IoT, serious gaming and fast markerless Augmented Reality
This paper describes a novel approach in engaging citizen communities based on serious gaming incorporating integration of the physical and digital worlds through aggregation of Internet of Things (IoT) service with Augmented Reality (AR) data visualization. The IoT service is provided by the ekoNET solution providing real-time monitoring of air quality and other atmospheric condition environmental data.…
Automatic modulation classification using S-transform based features
Automatic Modulation Classification plays a significant role in Cognitive Radio to identify the modulation format of the primary user. In this paper, we present the Stockwell transform (S-transform) based features extraction for classification of different digital modulation schemes using different classifiers such as Neural Network (NN), Support Vector Machine (SVM), Linear Discriminant Analysis (LDA), Naive Bayes (NB), k-Nearest Neighbor (k-NN).…
Image and video transmission in cognitive radio systems under sensing uncertainty
This paper studies the performance of hierarchical-modulation-based image and video transmission incognitive radio systems with imperfect channel sensing results under constraints on both transmit and interference power. Data intended for transmission is first compressed via source coding techniques and then divided into two priority classes, namely high priority (HP) data and low priority (LP) data, by taking…
An Alternative to Decoding Interference or Treating Interference as Gaussian Noise
This paper addresses the following question regarding Gaussian networks: Is there an alternative to decoding interference or treating interference as Gaussian noise? To state our result, we study a decentralized network of one primary user (PU) and one secondary user (SU) modeled by a two-user Gaussian interference channel. In one scenario, the primary transmitter is constellation-based and PUs…
Unified approach for performance analysis of Cognitive Radio Spectrum Sensing over correlated multipath fading channels
In this work, we analyse the performance of Cognitive Radio Spectrum Sensing (CRSS) systems with multiple receiving antennas considering the effect of correlation among fading branches. Exact closed-form expressions for the average detection probabilities (P̅D) are derived employing Probability Density Functions (PDF) approach for n.i.i.d.-L number of diversity branches over Nakagami-m fading channels with Maximal Ratio Combining (MRC)…