• Using adaptive nulling, an antenna system can reconfigure the receive antenna to produce nulls at the locations of any interference sources. Typically, two generic types of adaptive nulling antennas are considered: the thinned phased array and the multiple-beam antenna. The thinned phased array has excellent nulling resolution but is not a good candidate for area coverage. The multiple/beam a...

Background The traditional distributed system was first introduced approximately 20 years ago using fixed infrastructure [1]. Since then nomadic distributed systems have gone on to combine wireless edges with a fixed core infrastructure, where the load is primarily carried on the fixed infrastructure [1]. In this regime, the periphery of the communications system is composed of wireless devices...

Mobile ad hoc networks (MANETs) are of much interest to both the research community and the military because of the potential to establish a communication network in any situation that involves emergencies. Examples are search-and-rescue operations, military deployment in hostile environments, and several types of police operations. One critical open issue is how to route messages considering t...

This case is designed to relate the rationale used by the Department of Defense and the Test and Evaluation (T&E) Integrated Product Team, in order to determine the military utility of the Joint Medical Operations – Telemedicine Advanced Concept Technology Demonstration (JMO-T ACTD). The case also develops critical operational issues (COI) and measures of effectiveness (MOE) as methodologies fo...

Traditionally, for tactical Command & Control (C2), the Marine Corps utilized strictly voice communications as a result of continued reliability, modern innovative technology vulnerabilities, and the lack of ubiquitous data connectivity. Recently, driven by the technology advances there has been a shift in the paradigm toward more utilization of data applications, such as tactical chat and Blue...

This paper identifies the need for a secure military social networking site and the underlying research issues linked to the successful development of such sites. The paper further proposes a solution to the most basic issues by identifying and tackling known potential security threats to military personnel and their families. The paper further defines the base platform for this development to ...

Active antennas have been in use in communications satellites for decades. The antenna configurations include array-fed reflectors, multiple-beam lenses and direct radiating phased arrays. The active feedings of the antennas include single amplifier per radiating element and matrix power amplifiers shared between clusters of radiating elements. This paper reviews the combinations of antenna con...

The next generation of military communications satellites may be designed as a fast packet-switched constellation of spacecraft able to withstand substantial bandwidth capacity fluctuation in the face of dynamic resource utilization and rapid environmental changes including jamming of communication frequencies and unstable weather phenomena. We are in the process of designing an integrated sche...

The use of software radio technology will predominate the next generation of military radios, such as the Joint Tactical Radio System (JTRS) “Cluster One” being procured by the United States. The use of software radio technology is already widespread in commercial wireless base stations, and is spreading rapidly to mobile terminals. This paper examines military and commercial use cases involvin...