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Spectrum is limited, but the demand for it is growing steadily with new users, applications, and services in both commercial and tactical communications. The current paradigm of static spectrum allocation cannot satisfy this demand, resulting in a congested, contested environment with poor spectrum efficiency. Tactical radios need to share spectrum with other in- and out-ofnetwork tactical and commercial...
This paper studies the problem of routing in a multilayer (communication and social) network. Network protocols, such as link state routing and its variants, heavily used in mobile ad hoc networks (MANETs) cannot sustain robustness and efficiency as the topological information becomes easily stale with fast network dynamics. Attempts to collect and exchange excessive network information would result...
We introduce a method for detecting, localizing and identifying radio transmissions within wide-band time-frequency power spectrograms using feature learning using convolutional neural networks on their 2D image representation. By doing so we build a foundation for higher level contextual radio spectrum event understanding, labeling, and reasoning in complex shared spectrum and many-user environments...
Practical generation of secret bits using wireless channel measurements between two terminals is presented in this paper. The model used for this implementation assumes imperfect reciprocity between the channel measurements made by the two terminals in the presence of a passive eavesdropper. The channel measurements (e.g., received signal strength values) are used to estimate the secret key rate in...
In this paper, we implement an application-aware scheduler that differentiates users running real-time applications and delay-tolerant applications while allocating resources. This approach ensures that the priority is given to real-time applications over delay-tolerant applications. In our system model, we include realistic channel effects of Long Term Evolution (LTE) system. Our application-aware...
In this paper, we introduce an approach for application-aware resource block scheduling of elastic and inelastic adaptive real-time traffic in fourth generation Long Term Evolution (LTE) systems. The users are assigned to resource blocks. A transmission may use multiple resource blocks scheduled over frequency and time. In our model, we use logarithmic and sigmoidal-like utility functions to represent...
Creating a cognitive Long Term Evolution (LTE) network on an arbitrary frequency requires an LTE specific classifier. This paper explains a novel LTE signal classification method that requires no a priori information about the signal parameters including its frequency. The classification method consists of multiple steps. The first step is using a correlation-based discriminator which exploits the...
The effect of man-made noise in wireless microphone operation has been studied in this paper. Man-made noise measurements were taken in different locations in Vienna, VA and the amount of interference from man-made noise in potential wireless microphone channels were analyzed. Data collection results show that man-made noise levels can be up to 30 dB above the thermal noise floor. Our results show...
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