MILCOM 97 MILCOM 97 Proceedings

Motorola is investigating network architectures to support anti-jam wireless communications for the Advanced Telecommunication/Information Distribution Research Program Consortium sponsored by the U.S. Army Research Laboratory. It is envisioned that the network architecture will contain a distributed network control structure and mobile nodes. A major challenge in a distributed mobile wireless net... View full abstract»

A multidisciplinary research project is being undertaken at NPS to develop a semi-autonomous robotic system to detect and clear lab mines and unexploded ordnance (UXO). The robotic system under development consists of a land vehicle, an aerial vehicle, and a ground-based control station. Reliable communication between these three stations is needed. A traditional wire-based network requires that t... View full abstract»

L-3 Communications, Communication Systems-West is developing a single pitch, 6U VME satellite communications (satcom) modem (3158A) that is a full functional replacement for the OM-73 modem. The capabilities of this modem greatly exceed those of the OM-73, allowing it to operate with a number of military and commercial satcom services, supporting data rates ranging from 750 b/s to 75 Mb/s. The L-3... View full abstract»

In 1993, DARPA and CECOM embarked on a program called Commercial Communications Technology Testbed (C2T2). The goal of C2T2 was to systematically evaluate the applicability of commercial communication systems to tactical users, specifically the dismounted infantry. After a 6 month study phase, the first commercial system to be evaluated was chosen. This system was a trunked land mobile radio syste... View full abstract»

An OLS (orthogonal least squares) algorithm which efficiently combines structure and parameter estimation has been studied and applied to system identification for general NARMAX (nonlinear autoregressive moving average with exogenous input) stochastic systems by Chen et al. (1989). Based on QR decomposition, we present here how the OLS algorithm can be implemented recursively for general nonlinea... View full abstract»

We propose a novel signal-selective approach to enumerating the signals of interest (SOIs) impinging upon an array of antennas. This new signal selective information theoretic criterion (SSITC) is derived by formulating the likelihood function for parameters of second-order cyclostationary signals in unknown stationary interference plus noise, and then applying Rissanen's MDL principle. We demonst... View full abstract»

The 188-220 protocol test tool (PTT) was developed by the US Army CECOM Software Engineering Center. It combines software and hardware to monitor, decode, display, and analyze MIL-STD-188-220 traffic on the combat net radio (CNR) network. It operates under the Microsoft Windows NT operating system on a Pentium-class personal computer. This paper describes the functionality, capabilities, developme... View full abstract»

Based on factor space theory, a general framework called the expert machine, for building fuzzy expert systems is introduced. This machine helps experts capture intuitive expertise without the assistance of knowledge engineers, automatically builds the knowledge base, simplifies knowledge representation, reduces computer storage, and provides high-speed inference suitable for on-line problem solvi... View full abstract»

This paper presents an advanced capability technology demonstration (ACTD) proposed by Harris Corporation for the DoD ELB Program Office which will provide a high capacity (T3) wireless WAN. The ACTD will develop a virtual information network which will make the BG/ARG appear as a single ship to the embarked staff and provide HDR connectivity between afloat and ashore command centers View full abstract»

Even though the network trade press has highlighted the weaknesses in commercial-off-the-shelf (COTS) network management offerings, the status quo has changed little because most commercial networks are not structurally dynamic. Many military networks are comprised of strategic components, some in place for years, with limited bandwidth and increasing traffic payload requirements. Enhancing strate... View full abstract»

There are two major requirements, increased connectivity and bandwidth, for both military and commercial communications. Running counter to this is the high cost of installing new fiber and replacement of legacy systems. Wave division multiplexing and optical networks built using this technology are emerging as a leading solution to achieving higher bandwidths and channel capacity on existing inst... View full abstract»

A robust method for asynchronous modulation recognition without a priori knowledge about modulation and transmission parameters is proposed. The generated features are based on modulation dependent spectral lines observed in the estimated spectra of m-th law transformations of the received signal. A twofold robust normalisation scheme is introduced, which is adequate to build significant feature v... View full abstract»

The Near Term Digital Radio (NTDR) system is an Army open architecture networked data radio serving as a backbone for platoon to brigade that utilizes commercial modules and a standard bus. The NTDR system architecture employs a two-tier hierarchical network concept designed to increase capacity and reduce multiple access interference and relay delays. This paper presents an overview of the develo... View full abstract»

SPEAKeasy is a DoD R&D effort developing a multiband multimode radio (MBMMR) capable of 2 MHz to 2 GHz operation, employing waveforms selected from memory, or downloaded from floppy disk. The key is the publication of the open system architecture radio specification. A joint government/industry forum provides feedback and insight into the design. This way, other manufacturers will be able to p... View full abstract»

The US Army is investigating a Warfighter's Information Network (WIN) that includes the deployment of seamless multimedia voice, data and video services at the brigade level and below. Their intent is to leverage commercial PCS technology in the deployment of an autonomous network that supports fully distributed multimedia communications without the need for a commercial-type basestation infrastru... View full abstract»

We propose a new channel estimation and equalization scheme for time varying HF channels. Using a blind channel estimation (BCE) algorithm, the new approach estimates the channel impulse response directly without relying on the probe. Combined with the nonlinear data-directed estimator (NDDE), the new algorithm has two main advantages. First, it improves the transmission efficiency by eliminating ... View full abstract»

The Office of the Manager, National Communications System (OMNCS) is exploring the use of advanced intelligent network (AIN) capabilities to support national security and emergency preparedness (NS/EP) telecommunications requirements. To ensure that these critical NS/EP requirements can be supported, the security implications of AIN must be understood. Specifically, new AIN network elements add po... View full abstract»

Systems for the digital transmission of voice have traditionally been fixed rate in anti-jam situations. This design severely limits the potential of the communication system in the case of voice since compression of speech is a lossy process. Bit errors in the transmission of voice coded speech cause degradation which can be compensated for in several ways. The standard method is to trade off cha... View full abstract»

This paper deals with modulation classification of 4PSK (4 states phase shift keying) and 16QAM (16 states quadrature amplitude modulation) using a pattern recognition approach. The discriminating feature is build as an optimized combination of fourth and second order moments in order to maximize the probability of correct classification (P∞). This system is an extension of the on... View full abstract»

A new multistage Wiener filter is introduced which utilizes a decomposition based on orthogonal projections. A reduced-rank Wiener filter is developed based on this new structure which is not basis oriented, but evolves a basis which is a function of the multistage decomposition. The performance of this new Wiener filtering structure is evaluated using a comparative computer analysis model. It is ... View full abstract»

ATM data networks are being implemented by the DoD in an effort to provide the high throughput needed to satisfy emerging user missions. End-to-end network encryption has become available in the form of the FASTLANE (KG-75) in-line ATM encryptor. This device operates at speeds up to 622 Mbps and is approved by the National Security Agency for use with data of all security levels up to and includin... View full abstract»

We describe a novel modular learning strategy for the detection of a target signal of interest in a nonstationary environment, which is motivated by the information preservation rule. The strategy makes no assumptions on the environment. It incorporates three functional blocks: (1) time-frequency analysis, (2) feature extraction, (3) pattern classification, the delineations of which are guided by ... View full abstract»