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Military Communications Conference, 1994. MILCOM '94. Conference Record, 1994 IEEE

Date 2-5 Oct. 1994

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Displaying Results 1 - 25 of 215
  • A new jammer estimation method adapted to FH-PSK waveforms

    Publication Year: 1994, Page(s):1027 - 1031 vol.3
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (404 KB)

    It is well known that channel state information (CSI) can be used by the receiver to improve the BER performance of coded spread spectrum communications. Unfortunately, this information is generally not available, and has to be estimated by the receiver. The paper presents an efficient method for estimating jammer parameters, based on an iterative clustering technique. The approach presented is ap... View full abstract»

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  • Performance evaluation of an oversampled RAKE receiver

    Publication Year: 1994, Page(s):410 - 414 vol.2
    Cited by:  Papers (5)  |  Patents (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (443 KB)

    The adaptive RAKE receiver can be used in spread spectrum systems to combine the separate signal energies received due to multipath propagation effects. This paper presents an analytical performance evaluation of the average BER of an over-sampled RAKE receiver on a Rayleigh fading channel, and a comparison with asynchronous architecture. It is shown that over-sampling achieves a significant BER p... View full abstract»

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  • Proceedings of MILCOM '94

    Publication Year: 1994
    Request permission for commercial reuse | PDF file iconPDF (65 KB)
    Freely Available from IEEE
  • Frequency-hop signaling and multiple packets per transmission for store and forward packet radio networks

    Publication Year: 1994, Page(s):168 - 172 vol.1
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (508 KB)

    Store and forward packet radio networks often must be able to forward a packet through several radios to be able to deliver the packet to its destination. Forwarding protocols are required to control the relay of packets, and the protocols must account for the high variability of the qualities of the links and the unique characteristics of frequency-hop spread-spectrum signaling. The authors inves... View full abstract»

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  • Finite-difference time-domain of HF antennas

    Publication Year: 1994, Page(s):7 - 11 vol.1
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (240 KB)

    The FDTD method with higher-order absorbing boundary conditions is used to model and predict the input impedance and the far-field radiation of electrically short antennas. Far-field radiation results are presented and compared with measurement for HF loop (towel bar) and inverted-L antenna elements used at 10 MHz mounted on a helicopter-like body. Wideband input impedance predictions and measurem... View full abstract»

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  • Power control error in a CDMA satellite communication system

    Publication Year: 1994, Page(s):495 - 499 vol.2
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (424 KB)

    An adaptive power control (APC) scheme is essential to overcome shadowing and distance losses in a land mobile satellite system. Such a scheme, implemented on the uplink, ensures that all users' signals arrive at the base station with equal average power as they move within the satellite spot beam-an important requirement in a CDMA system. Because of the lengthy round-trip delay on a satellite lin... View full abstract»

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  • Communications center automation

    Publication Year: 1994, Page(s):674 - 679 vol.2
    Cited by:  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (620 KB)

    Martin Marietta developed a model for an automated navy radio room architecture and has implemented and demonstrated a subset of features to automatically command, control and monitor communication services for analog voice and digital data. Key features demonstrated include: 1. automation of monitor, control and (re)configuration functions with graphical display of equipment status information, 2... View full abstract»

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  • Transient behavior of the minimum mean-squared error receiver for direct-sequence code-division multiple-access systems

    Publication Year: 1994, Page(s):52 - 56 vol.1
    Cited by:  Papers (4)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (392 KB)

    This paper studies the transient behavior of an adaptive near-far resistant receiver for direct-sequence (DS) code-division multiple-access (CDMA) known as the minimum mean-squared error (MMSE) receiver. This receiver structure is known to be near-far resistant and yet does not require the large amounts of side information that are typically required for other near-far resistant receivers. In fact... View full abstract»

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  • Inside the command and control reference model

    Publication Year: 1994, Page(s):843 - 847 vol.3
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (552 KB)

    This paper provides an inside look at the C2RM and documents some of its more subtle aspects. More specifically, the taxonomy of the C2RM and its use with object-oriented benchmarks for modeling command and control are illustrated. In addition, the paper reviews known criticisms of the C2RM, attempts to dispel some of the apparent myths, and clarifies with specific examples possible areas of confu... View full abstract»

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  • Timing and carrier recovery techniques in DSP based digital receivers

    Publication Year: 1994, Page(s):639 - 643 vol.2
    Cited by:  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (360 KB)

    In conventional receivers, carrier recovery and timing recovery are performed in the analog domain by controlling the frequency and phase of voltage controlled oscillators (VCO) in their respective phase locked loop (PLL). When the control signal for these loops are generated in the sampled data domain by DSP techniques the digital samples must be brought to the analog domain by a pair of digital-... View full abstract»

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  • Electromagnetic interference and interaction with complex helicopter structures

    Publication Year: 1994, Page(s):12 - 16 vol.1
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (288 KB)

    Electromagnetic interference and interaction with complex helicopter structures is examined using general purpose electromagnetic codes such as the numerical electromagnetics code (NEC), surface patch (ESP) code and a finite-difference time-domain (FDTD) code. The geometry of a generic NASA helicopter model (7:1 scale) is processed using the GEOM which is a general geometry preprocessing code that... View full abstract»

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  • State-of-charge indicators [batteries]

    Publication Year: 1994
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (64 KB)

    Summary form only given. Prediction of the capacity remaining in used batteries is important information to the user. Each year millions of dollars are spent on batteries for use in portable electronics equipment. In order to maintain readiness, users currently replace batteries on a conservative schedule. This practice results in the waste of millions of dollars in battery energy every year-appro... View full abstract»

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  • Adaptive HF radio test results using real-time channel evaluation systems

    Publication Year: 1994, Page(s):890 - 894 vol.3
    Cited by:  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (524 KB)

    To facilitate the development of anti-interference features for proposed Federal Standard 1049 (adaptive high-frequency (HF) radio standard), adaptive radio systems and concepts have been solicited from Government and industry. One such contribution is an adaptive HF radio system, termed the SMARTNET (Skywave Management for Automatic Robust Transmission Network), that is capable of adapting power,... View full abstract»

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  • Tactical battlefield ATM

    Publication Year: 1994, Page(s):473 - 478 vol.2
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (480 KB)

    The Tactical Battlefield ATM Network will provide the communications infrastructure needed to interconnect distributed resources across the battlefield to allow rapid and intelligent use of resources. The network will open up the battlefield to a new class of applications that could not be supported by the existing systems. A soldier on the battlefield using a computer could, through the Tactical ... View full abstract»

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  • Error performance of the blind decision feedback equalizer using decorrelation

    Publication Year: 1994, Page(s):618 - 622 vol.2
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (304 KB)

    The decision feedback equalizer has the advantage of compensating for channel amplitude distortion without enhancing noise. Conventional decision feedback equalizers require a training sequence to help them adapt to unknown channel characteristics. Training sequences are not always appropriate. In such situations blind equalizers are more suitable. The blind decision feedback equalizer inherits fr... View full abstract»

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  • HF SChEMe: a skywave channel error model

    Publication Year: 1994, Page(s):870 - 874 vol.3
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (308 KB)

    Simulation has been extensively employed to evaluate concepts included in the current generation of automatic link establishment (ALE) high-frequency (HF) radio systems. As development of HF automation proceeds from link-layer technology to network- and higher-layer technology, it is no longer necessary to devote great amounts of computer time to detailed simulation of the physical medium. Instead... View full abstract»

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  • Trellis coding of non-coherent multiple symbol full response M-ary CPFSK with modulation index 1/M

    Publication Year: 1994, Page(s):453 - 457 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (464 KB)

    The paper introduces a trellis coded modulation (TCM) scheme for non-coherent multiple full response M-ary CPFSK with modulation index 1/M. A proper branch metric for the trellis decoder is obtained by employing a simple approximation of the modified Bessel function for large signal to noise ratio (SNR). Pairwise error probability of coded sequences is evaluated by applying a linear approximation ... View full abstract»

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  • The electronic intrusion threat to national security and emergency preparedness telecommunications

    Publication Year: 1994, Page(s):564 - 568 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (524 KB)

    The paper presents an assessment of the threat posed by individuals or groups that gain unauthorized access to elements of the nation's public telecommunications infrastructure. These individuals and groups, who are referred to as electronic intruders, possess the skills and tools to cause disruptions or denials of service, remotely monitor telecommunications traffic, steal sensitive information f... View full abstract»

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  • Implementation of the monitor and control system for the Caribbean Regional Operations Center (CARIBROC) communications network

    Publication Year: 1994, Page(s):669 - 673 vol.2
    Cited by:  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (424 KB)

    This paper describes the implementation of an adaptable, standards-based monitor and control system employed in a secure communications network, namely the Caribbean Regional Operations Center (CARIBROC) communications network. The monitor and control system integrates diverse network elements (i.e., equipment being controlled and monitored) from multiple vendors, many using unique and proprietary... View full abstract»

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  • High-capacity trunk radio for tactical communication on the digitized battlefield

    Publication Year: 1994, Page(s):188 - 192 vol.1
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (492 KB)

    Effective battlefield command and control that maximizes combat power, coupled with the high-mobility requirements of the battle staff, drives the need for a digitized battlefield network employing on-the-move, high-capacity wireless communications. The target high-capacity trunk radio (HCTR) link is a 156-megabits per second (Mbps), 64-QAM radio that operates in a 40-MHz bandwidth at a frequency ... View full abstract»

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  • Further results in likelihood classification of QAM signals

    Publication Year: 1994, Page(s):57 - 61 vol.1
    Cited by:  Papers (36)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (420 KB)

    Maximum likelihood decision theory is applied to the problem of classification of quadrature-modulated digital communication signals. Several aspects of the existing low signal-to-noise ratio (SNR) results are extended to the moderate and high SNR environments. An approximate probability density function (PDF) for the single-term approximation to the average log-likelihood-ratio (ALLR) which is va... View full abstract»

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  • Using Planyst in support of command and control

    Publication Year: 1994, Page(s):848 - 852 vol.3
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (648 KB)

    The command and control reference model is a layered structure interacting with the environment through four physical ports: communications, sensing/monitoring, infliction and transportation. An object oriented stochastic C2 graph architecture has been developed to model the combat and C2 dynamics of the associated processes within different layers. The latter structure must interact with a tool w... View full abstract»

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  • A concept for tactical wide-area network hub management

    Publication Year: 1994, Page(s):644 - 649 vol.2
    Cited by:  Patents (23)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (660 KB)

    Tactical wide-area network (WAN) management is concerned with the facilities to monitor and control the resources that provide high-quality tactical area communications services. Narrowly focused approaches have resulted in fielding of network control facilities (NCFs) dedicated to the individual management of a single family of tactical devices. These piecemeal approaches are now being recognized... View full abstract»

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  • Lattice CELP for low bit rate speech coding

    Publication Year: 1994, Page(s):703 - 707 vol.3
    Cited by:  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (280 KB)

    Proposes a CELP coder based on lattice codebooks to achieve toll quality speech at low bit rates. The new CELP coder allocates more bits for the codebook index allowing for larger codebooks which provide better speech quality as quantization levels increase. To allocate more bits for the codebook index the authors use backward adaptation to update a 10-th order LPC predictor. The LPC coefficients ... View full abstract»

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  • Exploiting advanced composite materials for lightweight shipboard SHF satellite communication antennas

    Publication Year: 1994, Page(s):17 - 21 vol.1
    Cited by:  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (808 KB)

    Naval satellite communications and capacity requirements demand improved shipboard antenna performance. Extraordinary design features and the use of lightweight composite materials are necessary to meet the requirements of a shipboard antenna for SHF satellite communications. Advanced materials, modeling, and analysis techniques are used to produce high-efficiency antennas for operating in shipboa... View full abstract»

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