11-14 Oct. 1992

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Displaying Results 1 - 25 of 240
  • Space based communication network for DoD applications

    Publication Year: 1992, Page(s):565 - 566 vol.2
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (118 KB)

    Summary form only given. To support low-altitude sensor satellites the authors advocate the establishment of a general-purpose space based communication infrastructure at medium or geosynchronous Earth orbit (MEO or GEO), to support the needs of future sensor systems. This communication infrastructure should be able to transfer information from a multitude of sensor-rate mobile uplinks (from groun... View full abstract»

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  • Update on PCS radio frequency issues

    Publication Year: 1992
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (64 KB)

    Summary form only given. PCS (personal communications service) incorporates a range of new wireless PBXs to rural microcells serving the over-the-road transportation industry. Each of these new services is the subject of a regulatory proceeding currently underway. In the case of spectrum, the Commission has proposed in the Emerging Technology Docket 92-9, 220 MHz of spectrum for new and emerging t... View full abstract»

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  • MILCOM '92 - 'Communications - Fusing Command, Control and Intelligence' Conference Record (Cat. No. 92CH3131-0)

    Publication Year: 1992
    Request permission for commercial reuse | PDF file iconPDF (104 KB)
    Freely Available from IEEE
  • The PR4G VHF ECCM system: extensive tactical communications for the battlefield

    Publication Year: 1992, Page(s):662 - 666 vol.2
    Cited by:  Papers (4)  |  Patents (20)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (529 KB)

    PR4G, a complete system for ECCM (electronic counter countermeasures) VHF tactical radio communications, is described. It has been developed to meet the requirements of the French army. Its characteristics, including enhancements and integration into the French C3I (command, control, communications, and intelligence) systems, are presented. The program and program management methodology are descri... View full abstract»

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  • New trends on high bit rate troposcatter links: a trade-off between tacticity and performance

    Publication Year: 1992, Page(s):6 - 11 vol.1
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (328 KB)

    The authors describe how to build a very mobile troposcatter station with a radio and a modem which can handle up to 4 Mb/s transmission. This is achieved by the combination of equalization and differential demodulation, and by a patented technique for getting a high diversity order with only one amplifier and one antenna View full abstract»

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  • The error probability of Reed-Solomon coding and interleaving on a bursty-noise channel

    Publication Year: 1992, Page(s):334 - 338 vol.1
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (452 KB)

    A useful bursty-noise channel model is proposed and, using this model, a binary communication system using Reed-Solomon coding and interleaving is analyzed. The model includes both thermal noise, which gives rise to random errors, and burst noise, which gives rise to error bursts. Error probabilities are derived for the uncoded system, and error probability bounds are derived for the coded system.... View full abstract»

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  • The use of antenna beam steering to improve the performance of meteor burst communications systems

    Publication Year: 1992, Page(s):12 - 17 vol.1
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (516 KB)

    It is demonstrated that beamforming techniques can significantly improve the performance of meteor burst systems. Simultaneous beamforming is shown to be an extremely efficient method of beam steering in the meteor burst environment. Measured results obtained over a link between Seattle, Washington, and Bozeman, Montana, show good agreement with predicted results, confirming the accuracy of the pr... View full abstract»

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  • Efficient simulation of multi-carrier digital communication systems in nonlinear channel environments

    Publication Year: 1992, Page(s):339 - 344 vol.1
    Cited by:  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (500 KB)

    For systems that contain both frequency division multiplexing and bandpass nonlinearities, the high sampling rate that is necessary for accurate simulation contributes to the long runtimes. A partial sum of products (ParSOP) method is proposed to reduce the sampling rate of such systems. The ParSOP method allows the simulation sampling frequency to be reduced by only generating those intermodulati... View full abstract»

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  • A comparison of ISDN and LAN technologies

    Publication Year: 1992, Page(s):530 - 532 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (284 KB)

    The author discusses the use of integrated services digital network (ISDN), broadband-ISDN, and fiber distributed data interface (FDDI) link protocols aboard ships. Connectionless services and connection-oriented services are compared, and their appropriateness for use in a tactical environment is analyzed. Conclusions are drawn on which technology is most appropriate for shipboard use and for use... View full abstract»

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  • An all digital 650-Mbps demonstration receiver for NASA's high data rate satellite applications

    Publication Year: 1992, Page(s):194 - 198 vol.1
    Cited by:  Papers (2)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (416 KB)

    A demonstration receiver that tracks and demodulates 650-Mb/s QPSK (quadrature phase-shift keying) data has been developed, utilizing a parallel processing VLSI architecture and multirate digital signal processing, to meet upcoming NASA satellite communication requirements. Data rates of 650 Mb/s were achieved with low implementation loss and two-sample/symbol operation using high-speed digital Ga... View full abstract»

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  • A frequency hopping sequential detection technique for in-net coarse acquisition

    Publication Year: 1992, Page(s):43 - 47 vol.1
    Cited by:  Papers (2)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (520 KB)

    The authors present the results of a study assessing the impact that sequential detection has on the performance of the two-level frequency hopping coarse acquisition detector. The performance of the two-level detector is computed for the case where the active correlations use sequential detection and compared to the conventional case where fixed correlation times are used. The results show that s... View full abstract»

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  • Total capacities of and maximum numbers of users in strictly bandlimited CDMA and FDMA Gaussian channels

    Publication Year: 1992, Page(s):247 - 251 vol.1
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (460 KB)

    The author compares the total capacities of strictly bandlimited additive white Gaussian noise channels with CDMA (code division multiple access) and FDMA (frequency division multiple access) signaling. Theoretically, orthogonal signaling such as FDMA achieves the total capacity of a strictly bandlimited channel by using the sinc pulse with a `brickwall' spectrum. However, when raised cosine pulse... View full abstract»

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  • Extraction of VLF-noise parameters

    Publication Year: 1992, Page(s):1040 - 1045 vol.3
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (348 KB)

    An algorithm is developed for real-time extraction of the parameters (power, impulsivity, and spikiness) of the Field-Lewinstein model for very-low-frequency (VLF) noise. This algorithm operates upon the first three moments of the noise envelope, which can be obtained by simple signal-processing hardware or software. The solution for the noise-model parameters in terms of the measured moments is b... View full abstract»

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  • An HF packet network for the Southern European Task Force

    Publication Year: 1992, Page(s):291 - 293 vol.1
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (304 KB)

    HF packet radio equipment was purchased for the Southern European Task Force Headquarters in Vicenza, Italy. The objective is to demonstrate the capability of HF packet radio to function as a base command, control, and administrative communication system. The HF packet radio system provides a voice and data capability, using commercial-grade, state-of-the-art HF communication transceivers with pac... View full abstract»

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  • Conversational voice communication over a high performance meteor burst channel

    Publication Year: 1992, Page(s):18 - 24 vol.1
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (620 KB)

    The authors describe a meteor burst system with sufficient performance to provide conversational voice communication. An advanced computer-based modeling technique used to design the high-performance system is illustrated, and some key system design parameters and technological advances are identified. Measured results are presented and compared with those for previous systems, and some applicatio... View full abstract»

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  • On channel identifiability based on second order cyclic spectrum

    Publication Year: 1992, Page(s):226 - 230 vol.1
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (408 KB)

    The author presents results that prove the identifiability of linear finite-dimensional channels with higher than minimum bandwidth based on the use of second-order cyclic statistics only. Since the sampled channel output is also cyclostationary, second-order cyclic statistics of data samples obtained at higher than the Nyquist sampling rate can be used to identify the unknown linear channel. With... View full abstract»

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  • Fiber optics trends and strategic applications

    Publication Year: 1992, Page(s):345 - 348 vol.1
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (344 KB)

    The authors first present the historical and forecasted trends in fiber optic technology, with implications for the expected cost of such transmission systems. The latest example of technology advances, the optical amplifier, is highlighted. The worldwide deployment of fiber optic systems is illustrated, and applications to the US Department of Defense are discussed. The Defense Commercial Telecom... View full abstract»

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  • Empirical evaluation of protocol performance over tactical networks

    Publication Year: 1992, Page(s):533 - 537 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (468 KB)

    The authors describe an experiment to evaluate the performance of a tactical network. The purpose of the experiment was to quantify the effect of three parameters, message length, message arrival rate, and transmission mode, on throughput and delay. The experiment was designed to allow an analysis of variance of these factors to examine their significance. Further data summaries helped quantify th... View full abstract»

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  • Variable rate voice coding system

    Publication Year: 1992, Page(s):364 - 367 vol.1
    Cited by:  Patents (32)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (288 KB)

    The authors discussed a variable bit rate voice coding system in digital communications networks. A novel voice compression method which provides significant improvement in transmission efficiency and flexibility for communications systems is described. The basic scheme used for the investigations involves the use of split vector quantized (SVQ) transform coding (TC) in conjunction with pitch pred... View full abstract»

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  • An importance sampling analysis of a non-interleaved Viterbi decoder in an RFI environment

    Publication Year: 1992, Page(s):575 - 579 vol.2
    Cited by:  Papers (1)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (448 KB)

    The authors present a model which analyzes a communications system consisting of a noisy channel, a transmitter/receiver, and a convolutional encoder/Viterbi decoder. The model determines the amount of bit error rate (BER) performance degradation caused by a bursty (e.g., pulsed RF interference) noise environment when interleaving is not used. It uses importance sampling to determine low BERs for ... View full abstract»

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  • On-board AJ enhancement using adaptive nonlinear processing: practical aspects of Smart AGC implementation

    Publication Year: 1992, Page(s):199 - 205 vol.1
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (564 KB)

    The authors have verified the capability of a new antijamming (AJ) approach that could be used for military satellite communication transponders. They have assessed performance in controlled jamming scenarios, and surveyed the capability of current technology to support near-term implementation. Smart AGC uses time-dependent, RF center stripping, the size of which is determined by a fast measureme... View full abstract»

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  • Hybrid (satellite and terrestrial) communication networks: object oriented generic tools for simulation and management

    Publication Year: 1992, Page(s):553 - 559 vol.2
    Cited by:  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (580 KB)

    The authors describe a generic object-oriented software environment for the simulation and management of hybrid communication networks (satellite and terrestrial), currently under development. Referred to as a systems engineering workstation for hybrid networks, the environment will have the capability to model such networks in a totally object-oriented way and link to network performance evaluati... View full abstract»

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  • Performance of a fast frequency-hopped DFT-based MFSK receiver with noise-normalization combining in a fading channel with partial-band interference

    Publication Year: 1992, Page(s):48 - 52 vol.1
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (472 KB)

    An error probability analysis is performed for a discrete-Fourier-transform-based (DFT-based) frequency-shift keying communications system using fast frequency-hopped spread spectrum (FFHSS) signals. A linear combination procedure referred to as noise normalization is used at the receiver to minimize the effects of partial-band interference. The use of FFHSS is found to improve the performance of ... View full abstract»

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  • Performance analysis of the FDDI MAC protocol

    Publication Year: 1992, Page(s):933 - 939 vol.3
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (804 KB)

    The fiber distributed data interface (FDDI) media access control (MAC) mechanism supports two classes of traffic: synchronous and asynchronous. The asynchronous traffic can further be divided into eight subclasses according to priority. The FDDI performance is closely related to its operational parameters, such as the number of stations on the ring, the frame size, and the target token rotation ti... View full abstract»

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  • Access flow control algorithms in broadband networks

    Publication Year: 1992, Page(s):252 - 256 vol.1
    Cited by:  Papers (1)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (424 KB)

    The authors present and analyze an access flow control algorithm which is applied at the access nodes to the network, specifically, at the input voice and video multiplexers. The algorithm uses a control signal that is proportional to the multiplexer congestion level to throttle the peak bit rate of the input arrival process. The algorithm comprises a continuous type of control rather than the con... View full abstract»

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