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Military Communications Conference, 1988. MILCOM 88, Conference record. 21st Century Military Communications - What's Possible? 1988 IEEE

23-26 Oct 1988

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Displaying Results 1 - 25 of 163
  • Rapid prototyping network management systems

    Publication Year: 1988, Page(s):891 - 895 vol.3
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (300 KB)

    The author presents a tutorial on the use of an expert shell in rapid prototyping of network management systems. Prototyping issues considered include the selection of an expert shell, software architecture, and the development cycle. It is concluded that expert-system shells provide a development environment that can dramatically boost productivity over conventional programming approaches and mak... View full abstract»

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  • MILCOM 88. 21st Century Military Communications - What's Possible? Conference Record. 1988 IEEE Military Communications Conference (IEEE Cat. No.88CH2537-9)

    Publication Year: 1988
    Request permission for commercial reuse | PDF file iconPDF (65 KB)
    Freely Available from IEEE
  • Performance analysis of Reed-Solomon codes in a slightly dispersive optical PPM system

    Publication Year: 1988, Page(s):7 - 12 vol.1
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (308 KB)

    Uncoded and coded optical pulse position modulation (PPM) systems are compared for both direct and heterodyne detection. Simulations of these systems with different code rates are included, and the gains obtained in the coded cases are reported. By using Reed-Solomon codes, it is seen that the performance of a coded system is improved over an uncoded system in direct detection. As the code rate is... View full abstract»

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  • IMAGENET: a high speed local area network

    Publication Year: 1988, Page(s):19 - 23 vol.1
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (315 KB)

    Developments in image and signal processing have generated the need for a distribution system capable of transferring extremely large files while maintaining acceptable delays for real-time control packets. To fill this need, IMAGENET has been developed, a local area network (LAN) capable of transferring large data packets, as well as small real-time command messages, over a STAR-configured fiber-... View full abstract»

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  • A fiber optic recirculating memory loop operating at microwave frequencies

    Publication Year: 1988, Page(s):31 - 34 vol.1
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (219 KB)

    The use of optical fibers as the delay line elements in high-frequency memory loops provides light-weight and small-size devices with long time delays. The authors present a performance analysis and experimental results on a 2-6 GHz fiber-optic recirculating delay line. It is shown that microseconds delays can be achieved using the fiber-optic memory loop (FOML) in the 2 to 6 GHz band. The main ad... View full abstract»

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  • The voice/data integrator

    Publication Year: 1988, Page(s):45 - 49 vol.1
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (350 KB)

    The authors present an architecture in which the realization and benefits of an integrated services network can be achieved utilizing the existing equipment currently being deployed. It is suggested that the voice/data integrator (VDI) will play a significant role in achieving this goal while providing the capability to share transmission resources more effectively in the near term. Features discu... View full abstract»

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  • A 4.8 kbps voice coding using pitch synchronous DFT

    Publication Year: 1988, Page(s):57 - 61 vol.1
    Cited by:  Papers (1)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (224 KB)

    The authors propose a 4.8-kbps voice-coding algorithm using pitch-synchronous discrete Fourier transform (DFT). This algorithm combines time-scale compression with pitch-synchronous DFT spectrum coding. It also discards the time-compressed signal-phase information and the nonharmonic spectral components to reduce the amount of information processes. Simulation results show that the reproduced soun... View full abstract»

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  • A secure audio teleconference system

    Publication Year: 1988, Page(s):63 - 67 vol.1
    Cited by:  Papers (23)  |  Patents (15)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (335 KB)

    The authors describe a secure teleconferencing system which can be operated in the public communications network. In this system, advantage is taken of the fact that clear speech must be available at each telephone set for the local participant, and this can be used with a distributed conference circuit to provide a multiparty conferencing system. The network conference control unit knows the addr... View full abstract»

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  • Application of fractionally-spaced decision-feedback equalizers to HF fading channels

    Publication Year: 1988, Page(s):103 - 107 vol.1
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (287 KB)

    The authors investigate various techniques for improving the performance of fractionally spaced decision-feedback equalizers (FSDFEs) when they are applied to HF fading channels. Because of the time-varying characteristics of these channels, a rapid tracking capability of the equalizer is essential. The authors focus on various techniques which reduce the misadjustment error of fractionally spaced... View full abstract»

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  • Delay densities and adaptive equalization of indoor radio channels

    Publication Year: 1988, Page(s):109 - 113 vol.1
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (382 KB)

    The authors analyze the benefits of using a decision feedback equalizer (DFE) in the indoor radio environment and examine the results of performance predictions for different channel modelings. A QPSK/DFE modem with second-order diversity can operate at a data rate that is an order of magnitude higher than that of a QPSK modem without equalization. A given set of measured profiles of the channel i... View full abstract»

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  • Bounds on the throughput in frequency-hop packet radio networks with convolutional coding

    Publication Year: 1988, Page(s):121 - 125 vol.1
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (388 KB)

    Lower bounds are developed for the throughput of a slotted, asynchronous frequency-hop packet radio network in which convolutional coding and Viterbi decoding are used for error control. The methods used for bounding the packet error probability for convolutional encoding and Viterbi decoding do not require prior knowledge of the complete transfer function for the code generator. These methods are... View full abstract»

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  • A frequency-hopped Ungerboeck-encoded 4-ary DPSK modem

    Publication Year: 1988, Page(s):133 - 141 vol.1
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (437 KB)

    The authors discuss the design of a frequency-hopped Ungerboeck-encoded 4-ary DPSK HF modem. First, they present a general channel model. Next, they present channel simulation results for rate-2/3 encoding of 8-ary and 4-ary differentially coherent DPSK. Both additive Gaussian white noise and Rayleigh fading channels are examined. The basic structure of the frequency-hopped waveform is elucidated,... View full abstract»

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  • Spread spectrum multiple access performance of orthogonal codes in fading multipath channels

    Publication Year: 1988, Page(s):143 - 147 vol.1
    Cited by:  Papers (4)  |  Patents (39)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (282 KB)

    Indoor wireless communications (IWC) is an attractive alternative to wire-based local area networks. However, the indoor environment is characterized by fading multipath channels. Direct-sequence spread-spectrum techniques, with their inherent resistance to multipaths, are promising for IWC. To allow multiple users within a limited bandwidth, code division multiple access (CDMA) is needed. The aut... View full abstract»

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  • Continuous phase quadrature phase shift keyed (CPQPSK) signaling technique

    Publication Year: 1988, Page(s):157 - 161 vol.1
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (257 KB)

    A continuous phase quadrature-phase-shift-keyed (CPQPSK) modulation technique is presented. This method uses a conventional QPSK-modulated signal and a phase trajectory converter to obtain nearly constant envelope amplitude and continuous phase trajectories. A computer simulation program, MODEM, is used to simulate the CPQPSK signaling technique. It is concluded that this technique is particularly... View full abstract»

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  • The undetected error probability for Reed-Solomon codes

    Publication Year: 1988, Page(s):163 - 167 vol.1
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (230 KB)

    R.J. McEliece and L. Swanson (IEEE Tran. Inform. Theory, vol.IT-32, p.701-3, 1986) offered an upper bound on P/sub E/(u), the decoder error probability given u symbol errors occur. In the present study, by using a combinatoric technique such as the principle of inclusion and exclusion, an exact formula for P/sub E/(u) is derived. The P/sub E/(u) of a maximum distance separable code is observed to ... View full abstract»

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  • A distributed military premises network architecture for campus-like applications

    Publication Year: 1988, Page(s):169 - 173 vol.1
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (227 KB)

    The authors propose a distributed military premises network architecture (DIPNET) for a wide range of campuslike military premises integrated services digital network (ISDN) applications. DIPNET is to offer integrated voice, data, and video services to the end-users for both premises network and network interface applications, and it has taken the network security, survivability, reconfigurability... View full abstract»

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  • ISDN-ASPEN-an ISDN performance evaluation tool

    Publication Year: 1988, Page(s):175 - 179 vol.1
    Cited by:  Papers (1)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (328 KB)

    To characterize the end-to-end performance of AT&T's ISDN BRI (Integrated Services Digital Network basic rate interface) services, a system called ISDN-ASPEN (Automatic System for Performance Evaluation of the Network) was developed. ISDN-ASPEN is a flexible, automatic data acquisition and analysis system built on the UNIX operating system. This system has the ISDN interface, which provides the ca... View full abstract»

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  • High-speed internetworking in a multi-vendor environment

    Publication Year: 1988, Page(s):181 - 186 vol.1
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (330 KB)

    The authors address a requirement for providing secure fully connected data processing services at a local site that may be spread out over several buildings of a campus environment. The network might consist of any variety of vendor terminals, workstations, hosts, or intermediate processors. Users are logically members of the same working community although they might reside in different location... View full abstract»

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  • LAN/WAN internetworking performance issues

    Publication Year: 1988, Page(s):187 - 192 vol.1
    Cited by:  Papers (1)  |  Patents (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (439 KB)

    Demand for interconnectivity from local area networks (LANs) to wide area networks (WANs) has been increasing rapidly. Several strategies exist to provide LAN/WAN internetworking capabilities, with each method exhibiting distinct performance issues. Performance issues are presented for bridge, router, and Brouter technologies specifically as they relate to WAN networking. The case of an ISO-to-X.2... View full abstract»

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  • C/sup 3/ product quality and interoperability

    Publication Year: 1988, Page(s):201 - 203 vol.1
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (143 KB)

    Within the military command, control, and communications (C/sup 3/) community interoperability has become a critical quality issue. A panel discussion is presented, providing a forum for: C/sup 3/ system users, C/sup 3/ system integrators, and C/sup 3/ hardware and software vendors to present their case so that a better understanding of the importance of interoperability in the development of qual... View full abstract»

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  • EMUL-a parallel processor emulator

    Publication Year: 1988, Page(s):211 - 214 vol.1
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (202 KB)

    EMUL is a user-friendly computer program that emulates the operation of a parallel processor. EMUL's capacity to emulate down to the chip or up to the cell level of a parallel processor gives EMUL powerful applications. Its capability to specify a parallel processor down to the chip/noise level, without regard for low-level electronic details such as drivers and resistors, permits the user to rese... View full abstract»

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  • GaAs digital arithmetic subsystem for high data-rate signal processing

    Publication Year: 1988, Page(s):215 - 219 vol.1
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (698 KB)

    A high-speed, low-power GaAs digital arithmetic subsystem has been developed which performs 8-bit arithmetic and logic functions required for signal processing. The subsystem integrates seven GaAs integrated circuits, including an 8*8-bit multiplier/accumulator, two 4-bit arithmetic logic units, three logical multiplexers, and a logical demultiplexer, using a commercially available prototype board... View full abstract»

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  • Fault tolerant high speed network for space systems

    Publication Year: 1988, Page(s):221 - 228 vol.1
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (486 KB)

    A robust, dynamically reconfigurable topology is needed for multiple-fault tolerance and automatic repair on long missions or in reusable systems. A forward-loop backward-hop (FLBH) braided-mesh network is compared to the FDDI ANSI X3T9.5 standard to determine response time under varying traffic conditions using different routing algorithms. The results show that FLBH: has a better response time f... View full abstract»

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  • Meteor burst link performance sensitivity to antenna pattern, power margin and range

    Publication Year: 1988, Page(s):257 - 263 vol.1
    Cited by:  Papers (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (417 KB)

    Physical models of a meteor-burst-communication channel (METLINK) and a link simulator (METWAIT) were developed. Validation was performed using data measured on an experimental link in Greenland. METLINK and METWAIT were used to determine the sensitivity of 1000-character message waiting times to antenna pattern, link power margin, and range. This analysis shows that the sensitivity of message wai... View full abstract»

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  • An improved technique for calculating outage time due to multipath fading effect

    Publication Year: 1988, Page(s):271 - 277 vol.1
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (455 KB)

    The authors present a unified analytical method for calculating the outage time of a digital radio relay system due to the multipath interference effect over line-of-sight paths. A computer program is used to simulate a two-path multipath transmission channel and the pulse-shaping networks in the modem. These simulations are used to obtain channel outage time caused by both multipath channel chara... View full abstract»

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