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Compared to conventional radar systems, passive coherent location (PCL) systems utilize transmitters already deployed within an environment. In this paper, we investigate PCL systems to estimate an unknown target position in three dimensional space, and propose a target-tracking process of three steps: 1) receiver selection, 2) target-tracking algorithm, and 3) filtering process. To reduce an estimation...
This work studies centrality metrics as forwarding load predictors, for both unicast and multicast traffic, within dynamic ad hoc network topologies. We present results from a series of emulation experiments based around an emergency response mobile network scenario. From collected temporal topological and traffic data, we calculate a rank correlation measure between predictive centrality metrics...
Mobile tactical networks (MTNs) in military communications extend the capabilities of mobile ad-hoc networks (MANETs). The MTNs are dynamic, infrastructureless, self-forming and self-healing systems designed for non-line-of-sight (NLOS) operations using multi-hop relaying. Unlike their commercial counterparts, MTNs have to offer much higher levels of security, jamming resistance, and service robustness...
Distributed Denial of Service (DDoS) attacks serve to diminish the ability of the network to perform its intended function over time. The paper presents the design, implementation and analysis of a protocol based upon a technique for address agility called DDoS Resistant Multicast (DRM). After describing the our architecture and implementation we show an analysis that quantifies the overhead on network...
Underwater communication with autonomous underwater vehicles (AUVs) has strong demands on the modems caused by the constantly changing signal propagation (multi-path propagation, scattering, diffraction and refraction at thermal layers, etc.) of the underwater channel. These demands typically lead to a modem designed to match specific conditions. In this paper we present an automated model-based physical...
In this paper, we investigate the performance of a generic relay system for small cells. The main features include the selection decode-and-forward (DF) scheme, Rician and Rayleigh fading, single or repeated transmissions in direct link, and maximal-ratio combining at destination. We are able to derive a set of closed-form expressions for the end-to-end performance. Based on these formulas, we define...
Today, rapid business and technology innovations are producing an array of advanced commercial satellite communications (COMSATCOM) systems that can deliver massive amounts of SATCOM capacity at a fraction of current cost and offer communications diversity that is critical for achieving resilience in a military contested environment. Recognizing the alignment of commercial capabilities with the Department...
In this paper, the problem of single-channel blind source separation (SCBSS) of a mixture of two co-frequency phase-shift keying (PSK) signals with unknown carrier frequency offsets (CFOs) is investigated. Two SCBSS algorithms which are robust to CFOs are proposed to perform separation of the mixture signals. In the first algorithm, the phase changes of the received signals caused by CFOs are tracked...
Range extension via the use of small aircraft with highly directional antennas that act as relays is a topic of interest in military network technology development. Antenna elements in such designs typically have limited field-of-view (FoV), potentially making interconnectedness among communication nodes dependent on the geometry of the physical network. This paper examines a generic sectorized pod...
There has been a significant increase in the number of sensors deployed to accomplish military missions. These sensors might be on manned or unmanned resources, and might collect quantitative and/or qualitative information important for mission success. Of critical importance for mission success is ensuring that the collected information is routed to the people/systems that need the information for...
The goal of this paper is to expand from previously researched liquid metal linear array models into a dynamically driven two dimensional liquid metal array. Simulations were performed using FEKO to prove the concept that a multi-dimensional array will provide the user more control over the direction of the main beam and also the direction of the nulls, making the resulting array useful for spatially...
Although a number of asynchronous physical-layer network coding (PNC) schemes have been proposed, synchronous PNC may still be preferred for its simplicity. In this paper we propose a new symbol-level synchronization scheme which reduces the misalignment to less than one hardware clock cycle period. In addition, we prototype the proposed scheme on the Universal Software Radio Peripheral (USRP) platform...
In this paper, the WISCA Software Defined Radio (SDR) Network platform are presented. The WISCA SDR Network provides the user with a highly configurable and flexible algorithm development platform to conduct wireless communication research. Each node in the network utilizes Ettus Research USRP (Universal Software Radio Peripheral) technology for the radio frequency front end, along with the industry...
This paper explores several algorithms that sequentially select input values to probe a discrete memoryless binary output channel (DMBOC) and establish a communication rate close to the capacity C. Adapting techniques from pure-exploration multi-arm bandit problems, each algorithm strives to sample an unknown channel as few times as possible to maximize a lower-bound rate RL that: (1) holds with at...
Wireless power transfer may enable remotely powered operation of low-energy devices. The use of directional antenna arrays makes millimeter wave (mmWave) band a potential candidate for wireless power transfer. The mmWave signals, however, are prone to blockage due to human bodies. This paper presents a feasibility study of using mmWave for wireless power transfer in a large-scale network consisting...
Efficient network communications are essential to enable network-centric warfare. However, tactical edge networks present an extremely challenging and heterogeneous networking environment due to heterogeneous architectures, dynamic topologies, unwanted adversarial behavior, interference, and other wireless channel conditions. In order to support end-user applications and guarantee system performance...
Tire Pressure Monitoring Systems (TPMS) offer real-time diagnostics of the status of a vehicle's tires via a wireless communications link back to the vehicle. These links, which provide data, mandated by the NHTSA, generally possess low security/low privacy, leading to a demonstrated potential for spoofing attacks or tracking a person/vehicle through the unencrypted emission of the tire's unique identifier...
Dynamic Spectrum Access (DSA) based Cognitive Radio (CR) allows a secondary user (SU) to use spectrum in an opportunistic manner when the primary user (PU) of that spectrum is not transmitting. Conventional dynamic spectrum allocation methods deal with acquiring spectrum as fixed width channels. In this paper, we propose a novel technique where a node inside a network can dynamically access the spectrum...
This paper describes an approach to address the challenges currently found in the management, provisioning, and troubleshooting of deployed SATCOM Terminals. We believe the proposed solution will address a major capabilities gap in the DOD's ability to maintain reliable and resilient network communications flows required for mission success in a dynamic net-centric battlefield. The proposed solution...
This paper presents the joint design of network coding and backpressure algorithm for cognitive radio networks and its implementation with software-defined radios (SDRs) in a high fidelity network emulation testbed. The backpressure algorithm is known to provide throughput optimal solutions to joint routing and scheduling for dynamic packet traffic. This solution applies to cognitive radio networks...
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