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IEEE Conference on Military Communications

Sept. 30 1990-Oct. 3 1990

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Displaying Results 1 - 25 of 245
  • MILCOM 90. A New Era. 1990 IEEE Military Communications Conference. Conference Record (Cat. No.90CH2831-6)

    Publication Year: 1990
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    Freely Available from IEEE
  • A frequency tracking RAKE demodulator for multipath channels

    Publication Year: 1990, Page(s):1020 - 1024 vol.3
    Cited by:  Papers (2)  |  Patents (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (292 KB)

    The structure and performance of a frequency-tracking RAKE receiver for spread-spectrum HF communications are discussed. The receiver uses a frequency-tracking loop that compensates for the Doppler-induced phase offset between the correlator output signal and the channel reference to maximize the resulting signal-to-noise ratio at the output. The processing estimates the average multipath phase of... View full abstract»

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  • A study of frequency selective multipath fading on an 8-GHz, 135.6-km overwater digital microwave path

    Publication Year: 1990, Page(s):461 - 465 vol.1
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (424 KB)

    Preliminary results of an ongoing study of a 135.6-km overwater path (Seburiyama, Japan to the Tsushima repeater with 106.4-km link from Tsushima to Changsan, Korea) showing the effects of severe reflective multipath and excess path clearance are presented. The results of five months of test results are covered. The path performance is monitored by the use of a computer-aided data acquisition syst... View full abstract»

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  • Soft-limiter RAKE receivers for coded DS/DPSK over pulse jammed multipath-fading channels

    Publication Year: 1990, Page(s):1014 - 1019 vol.3
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (396 KB)

    Two soft-limiter RAKE receivers that use a combination of antenna and multipath diversity are evaluated for direct-sequence differential phase shift keyed (DS/DPSK) signaling over a pulse jammed multipath-fading channel. One receiver uses predetection selective (antenna) combining and postdetection equal gain (multipath) combining, and the other uses postdetection equal gain combining only. In eit... View full abstract»

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  • Software for the analysis of microwave operational scenarios

    Publication Year: 1990, Page(s):456 - 460 vol.1
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (360 KB)

    Microwave operational scenario evaluation software (MOSES) for IBM-PC-compatible computers was developed to analyze propagation effects up to 1000 GHz. The purpose of the software is to provide a uniform, user-friendly interface to a great variety of analysis programs so that it is not necessary to learn to use different software packages each time a new problem is analyzed. Applications to be ana... View full abstract»

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  • A gate-array-based programmable Reed-Solomon codec: structure-implementation-applications

    Publication Year: 1990, Page(s):121 - 125 vol.1
    Cited by:  Papers (3)  |  Patents (26)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (260 KB)

    The structure, implementation, and potential application of a gate-array-based programmable Reed-Solomon encoder/decoder (codec) chip set is presented. The encoder is based on a transform encoding scheme. The decoder is based on a modified version of the time-domain decoding (transform decoding without transform) algorithm. This algorithm has a regular structure, which is important for VLSI implem... View full abstract»

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  • A new receiver operating in multiple access interference related to the near far problem

    Publication Year: 1990, Page(s):966 - 969 vol.3
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (192 KB)

    A receiver designed for direct sequence code division spread spectrum multiple access (DS/SSMA) systems is described. The interference is modeled by additive white Gaussian noise (AWGN) and one spread spectrum signal introduced by a multiple access user. It is assumed that the interfering user is near to the receiver and appears as a strong signal at the receiver's front end. This constellation is... View full abstract»

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  • Packet communication technology for advanced wireless networks

    Publication Year: 1990, Page(s):627 - 632 vol.2
    Cited by:  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (460 KB)

    Two techniques for future (third-generation) wireless networks are described. They are a switching architecture, referred to as a cellular packet switch, and a packet transmission technique, referred to as packet-reservation multiple access. It is shown how the two can work together to meet the demands of third-generation wireless networking. As a network design example, a dual-bus metropolitan ar... View full abstract»

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  • A soft decision syndrome decoding algorithm for convolutional codes

    Publication Year: 1990, Page(s):375 - 379 vol.1
    Cited by:  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (256 KB)

    Bit decoding algorithms of convolutional codes are used for real-time systems. A syndrome decoder is shown to be an efficient way for very high data rate implementation. With soft decision signals, the performance of the decoder can be improved. Utilizing a signal-plus-noise channel model to specify a Q-level quantized AWGN channel or a binary input Q-ary output channel, one is a... View full abstract»

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  • VLSI development of a global memory interface controller

    Publication Year: 1990, Page(s):254 - 257 vol.1
    Cited by:  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (308 KB)

    A high-speed global bus chip used for interprocessor communications is developed. This 2.0 μm CMOS standard cell integrated circuit is targeted for use in digital signal processing (DSP) applications where global memory resources are required. The global memory interface controller (GMIC) contains both a bus arbitration unit to prevent bus contention and a memory controller to access the addres... View full abstract»

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  • Meteor burst communications LPI applications

    Publication Year: 1990, Page(s):1009 - 1013 vol.3
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (252 KB)

    A technique that enhances the performance of meteor-burst communications is described. The technique, the feedback adaptive variable rate (FAVR) system, maintains a feedback channel that allows the transmitted bit rate to mimic the time behavior of the received power so that a constant bit energy is maintained. This results in a constant probability of bit error in each transmitted bit. Experiment... View full abstract»

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  • Survivable planar internetwork (SPIN) for multimedia communications

    Publication Year: 1990, Page(s):311 - 317 vol.1
    Cited by:  Papers (1)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (644 KB)

    A survivable planar internetwork (SPIN) architecture to interconnect local area networks (LANs), wide area networks (WANs), and extended-area satellite networks (ESANs) by organizing them into various connectivity planes that extend tie range of survivable communications provided by each is proposed. The core of the SPIN architecture is a layer of gateways that interconnect purpose-specific networ... View full abstract»

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  • Advances in line-of-sight link design for DoD applications

    Publication Year: 1990, Page(s):449 - 455 vol.1
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (420 KB)

    A comprehensive line-of-sight (LOS) link design program for Department of Defense (DoD) applications is discussed. A brief description of the digital LOS radio link design process as it is codified in a link design program is provided. This program provides a unified and complete methodology for link design, based on a mix of documented approaches. The general design process and program structure ... View full abstract»

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  • Physical- and link-layer modeling of packet-radio network performance

    Publication Year: 1990, Page(s):596 - 602 vol.2
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (552 KB)

    An analytic model that takes into account the properties of realistic link-layer mechanisms, such as the unreliable nature of acknowledgements, is presented. Attention is given to the mixed-packet capability of the model; the user may specify the distribution of packets having a particular combination of forward error correction and symbol rates. The resulting models cannot be solved analytically,... View full abstract»

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  • Performance of a parallel time-frequency direct sequence spread-spectrum acquisition scheme

    Publication Year: 1990, Page(s):151 - 155 vol.1
    Cited by:  Papers (3)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (288 KB)

    The implementation and detailed detection performance of a direct sequence spread-spectrum, fast code, and frequency acquisition receiver are discussed. This receiver has been established to possess an excellent processing structure when a large number of search intervals are required. This receiver, implemented for use with NASA's tracking and data relay satellite system (TDRSS), is required to r... View full abstract»

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  • Efficient link quality estimation in DS spread systems

    Publication Year: 1990, Page(s):771 - 775 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (264 KB)

    The author describes an algorithm for generating a link quality estimate (LQE) for direct-sequence (DS) phase-shift-keyed (PSK) signals that simultaneously possess good estimator properties, low-computational requirements, and a form easily incorporated into a digital receiver architecture. The algorithm exploits the nonlinear magnitude operations, available in the noncoherent and data automatic g... View full abstract»

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  • Intersymbol interference due to an ideal filter with linear amplitude attenuation

    Publication Year: 1990, Page(s):1276 - 1280 vol.3
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (252 KB)

    The square pulse response of an ideal low-pass filter with linear amplitude attenuation is evaluated in terms of the exponential integral function. This result is used to determine the intersymbol interference terms for binary phase-shift keyed (BPSK) and quadrature phase-shift keyed (QPSK) transmissions through the corresponding bandpass channel filter. Properties of the intersymbol interference ... View full abstract»

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  • Custom CMOS Reed Solomon coder for the Hubble Space Telescope

    Publication Year: 1990, Page(s):116 - 120 vol.1
    Cited by:  Papers (1)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (324 KB)

    A VLSI coder is presented that can function either as an encoder or decoder for Reed-Solomon codes. Full-custom VLSI is used to achieve both circuit density and speed, and allows control of the amount of interconnect. Speed, which is a function of capacitance, which is a function of interconnect, is an important parameter in high-performance VLSI. A single 8.2 mm×8.4 mm, 200000 transistor CM... View full abstract»

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  • The theoretical performance of optimal time-dependent filters for co-channel interference rejection

    Publication Year: 1990, Page(s):961 - 965 vol.3
    Cited by:  Papers (1)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (404 KB)

    Using the performance criterion of mean-square-error, periodically time-dependent and almost periodically optimal time-dependent filters (OTDF) are shown to be theoretically superior to time-independent optimal filters for suppressing cochannel interference in digital communications. The time-dependent filter is shown to be capable of exploiting the spectral correlation properties of digital commu... View full abstract»

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  • Response time calculation for VSAT networks

    Publication Year: 1990, Page(s):1184 - 1188 vol.3
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (392 KB)

    The response time of a VSAT network, which consists of network access time from VSAT terminals to the hub station, query waiting and processing time, and response queueing and transmission delay, is calculated. In addition to mathematical derivations, numerical examples are presented, and computer simulations are provided that verify the validity of the derived results View full abstract»

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  • A variable gain MMIC SSPA

    Publication Year: 1990, Page(s):475 - 482 vol.1
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (508 KB)

    A variable gain amplifier module design using three monolithic microwave integrated circuit (MMIC) chips in a single custom ceramic package for satellite communication applications is described. Feedback is used in the MMIC amplifier design (SCAMP4) to be deliberately tolerant to process variations in providing excellent gain flatness. It is noteworthy that while the SCAMP4 design was derived from... View full abstract»

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  • Multiclass routing

    Publication Year: 1990, Page(s):622 - 626 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (404 KB)

    An alternative to minimum-cost routing control, called multiclass routing, is presented. Multiclass routing was developed as an extension to a suite of link and network protocols for a mobile-radio environment. These protocols were based on the design of a packet radio that uses spread spectrum whose parameters are controllable in real time. In particular, a link-control protocol takes advantage o... View full abstract»

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  • Analysis of the structural efficiency of digital signal processing algorithms and their implementation on parallel processing architectures

    Publication Year: 1990, Page(s):1290 - 1294 vol.3
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (388 KB)

    A methodology for the analysis of the structure of a given digital signal processing algorithm is presented. The task precedence relationships within a scheduling cycle are derived for scheduling cycles that contain one and two basic cycles, which is sufficient to derive the precedence relationships for scheduling cycles that contain an arbitrary number of basic cycles. The schedules considered ar... View full abstract»

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  • On survivability measures for military networks

    Publication Year: 1990, Page(s):1120 - 1124 vol.3
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (336 KB)

    Several measures that ensure network survivability, the measure of a network's endurance in the presence of possible component failures, are reviewed. Two additional survivability measures, the minimum cut-tree formulation and weakest cut-tree formulation, are proposed. An algorithm for the computation of the cut-trees and an example of the applications of these measures are presented View full abstract»

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  • Multidimensional trellis coding for MPSK

    Publication Year: 1990, Page(s):369 - 374 vol.1
    Cited by:  Papers (1)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (380 KB)

    The use of multidimensional M-ary phase-shift keying (MPSK) signaling is considered for bandwidth and power efficient communication. Trellis-coded modulation is used to code N successive symbols (N-dimensional coding) of MPSK at one time to form a more complex signal than symbol-by-symbol coding, with the expectation of improved performance. In the general case, it is fo... View full abstract»

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