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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
  • Detectability of packet communications using variants of the X.25 protocol

    Publication Year: 1990, Page(s):648 - 652 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (364 KB)

    The low probability of intercept (LPI) performance of a variant of a robust, proven packet transmission protocol, AX.25, is examined. Both AX.25 and its variant are described. In the latter the message is packetized, overhead information is added to it, and it is sent a go-back-N protocol. The system performance is quantified in terms of the distribution function of the increase in detect... View full abstract»

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  • Equalization for mobile communications channels

    Publication Year: 1990, Page(s):643 - 647 vol.2
    Cited by:  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (244 KB)

    An equalization technique that demonstrates rapid channel tracking and equalization through the use of periodic training data in the random data is presented. A decision-feedback equalizer is used. Simulation results obtained with the recursive least squares (RLS) and row-action-projection (RAP) algorithms are given. The RLS algorithm is an exact least-squares technique; the RAP algorithm is a mod... View full abstract»

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  • 35-GHz monolithic GaAs FET power amplifiers

    Publication Year: 1990, Page(s):483 - 485 vol.1
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (308 KB)

    A state-of-the-art 35-GHz monolithic GaAs power amplifier, based on metal semiconductor field-effect transistor (MESFET) technology, is developed for millimeter-wave communications and seeker applications. Both single-ended and balanced amplifier configurations, with on-chip DC-block and bias networks, are designed and evaluated. A cascaded four-stage amplifier exhibited 14.6 dB of linear gain and... View full abstract»

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  • An adaptive superresolution algorithm and its application to interference suppression

    Publication Year: 1990, Page(s):637 - 642 vol.2
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (396 KB)

    An adaptive superresolution algorithm, called the signal suppression algorithm, is derived and analyzed. The algorithm, which controls an adaptive filter, is derived by the method of steepest descent with the constrained minimization of the filter output power as the performance criterion. Computer simulation results verify the effectiveness of the algorithm in resolving closely spaced signals. Se... 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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  • CDMA for personal communications networks

    Publication Year: 1990, Page(s):633 - 636 vol.2
    Cited by:  Papers (4)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (400 KB)

    Issues relevant to code-division multiaccess (CDMA) personal communication networks are discussed. An experiment that is designed to test the feasibility of overlaying a spread-spectrum network on top of an existing narrowband microwave network is described. Design considerations, propagation effects, and interference measurements are covered View full abstract»

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  • Value-based message multiplexing: an analytical model

    Publication Year: 1990, Page(s):525 - 531 vol.2
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (540 KB)

    It has been proposed that messages be explicitly tagged with a value function that indicates the message's value to the system as a function of its delay. Also proposed, for use in a message multiplexer, was the MUST (maximum utility scheduling for transmission) protocol, which explicitly considers the value functions of messages waiting for transmission and determines a transmission schedule that... View full abstract»

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  • Meteor burst link and network simulator

    Publication Year: 1990, Page(s):878 - 883 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (396 KB)

    A meteor burst link/network simulator that has been developed to facilitate the testing of the next-generation meteor scatter communication equipment and terminals is described. With the capability to interface to 15 terminals configured into an arbitrary network with up to 30 independent links, the simulator will have significant flexibility to test a variety of network architectures. In addition... 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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  • 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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  • Multi-octave GaAs MMIC receivers

    Publication Year: 1990, Page(s):470 - 474 vol.1
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (224 KB)

    MMIC technology has enabled very complex microwave and millimeter-wave systems to be conceived, using a modular approach to the various functions. The application of this modular approach to the design of advanced multioctave microwave receivers is described. The individual building blocks are described, and typical performances are given. The integration of complete compact receiver modules using... 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 single hop data/voice VSAT

    Publication Year: 1990, Page(s):521 - 524 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (216 KB)

    The hub-configured double-hop VSAT (very small aperture terminal) considered to be a cost-effective method for transmitting/receiving low-speed data during the 1980s was costly in terms of quality, transmission delay, loss of revenue, and dependence on the hub station. It is demonstrated that newer satellites, combined with the state-of-the-art ground station technology of the late 1980s, eliminat... View full abstract»

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  • An investigation of the meteor channel for adaptive communication systems

    Publication Year: 1990, Page(s):873 - 877 vol.2
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (196 KB)

    High resolution measurements have been carried out to characterize the time spread properties of overdense meteor trails. A number of other parameters of interest for adaptive communication systems have been examined for both underdense and overdense trails. It has been found that the time spread in the overdense trails is not severe for data rates up to 250-500 kbit/s. For the underdense trails, ... View full abstract»

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  • Performance analysis of compressive receivers used for signal detection

    Publication Year: 1990, Page(s):1004 - 1008 vol.3
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (260 KB)

    A performance comparison between a compressive receiver and a wideband radiometer using sine waves and binary phase-shift-keyed (PSK) signals for the detected waveform is presented. The results indicate that the compressive receiver outperforms the radiometer in detecting the presence of a sine wave. The results also show that the compressive receiver exhibits superior performance when the input c... 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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  • An adaptive phase processing technique applied to the recovery of a coherent reference

    Publication Year: 1990, Page(s):146 - 150 vol.1
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (264 KB)

    The adaptive numerical phase processor (ADNUPP) is discussed, which applies a simple implementation of a minimum variance estimator (Kalman filter) to obtain an estimate of carrier phase and frequency coherence. This technique allows the acquisition of the carrier phase in a deterministic time frame with a minimum of phase jitter as described by the estimation and measurement noise parameters in t... View full abstract»

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  • Multi-harmonic load-pull: a method for designing MESFET frequency multipliers

    Publication Year: 1990, Page(s):466 - 469 vol.1
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (212 KB)

    A multiharmonic active load-pull system is used to characterize transistors in their nonlinear region of operation. The harmonic tuning for optimum loads is done independently from the fundamental tuning. Load-pull measurements on a MESFET have been performed at the fundamental (f0), second harmonic (2f0 ), and third (3f0) harmonic. The a... 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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  • Correcting spectral envelope shifts in linear predictive speech compression systems

    Publication Year: 1990, Page(s):354 - 358 vol.1
    Cited by:  Patents (11)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (244 KB)

    An algorithm to correct for spectral envelope distortion in the synthetic excitation signal in residual excited linear-predictive (LP)-based vocoders is presented. In these coders, if the residual is regenerated exactly, the original signal can be recovered exactly. However, exact recovery of the residual is not possible since it is always quantized by some sort of coding process, causing it alway... View full abstract»

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  • BER improvement of PRCPM in mobile radio channels with differential detection using decision feedback equalization

    Publication Year: 1990, Page(s):516 - 520 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (192 KB)

    The bit-error-rate (BER) improvement of partial-response continuous-phase-modulation (PRCPM) signals in fast Rayleigh fading that is achieved by adding a postdetection decision-feedback equalizer (DFE) to cancel the effect of intersymbol interference of one adjacent bit is investigated. A closed-form expression for the average probability of error in fast fading is derived for one-bit differential... View full abstract»

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  • Diversity combining and Reed-Solomon coding for fast frequency hopped noncoherent MFSK

    Publication Year: 1990, Page(s):106 - 110 vol.1
    Cited by:  Papers (5)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (380 KB)

    A robust concatenated coding scheme to provide protection against intelligent jamming is presented. The concatenated code uses a simple repetition (diversity) inner code and an outer Reed-Solomon (RS) error-correcting code. Two powerful diversity combining methods, normalized envelope detection (NED) and the second-and-first moment (2-1 M) method, are considered. The signaling is fast frequency ho... View full abstract»

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  • Comparison of collision avoidance techniques for efficient voice transmission on Ethernet

    Publication Year: 1990, Page(s):37 - 40 vol.1
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (240 KB)

    Ethernet with standard CSMA/CD (carrier sense multiple access with collision detection) is not suitable for voice due to its high bandwidth requirements and low tolerance to network delays. Collision avoidance approaches offer attractive pay-offs in terms of deterministic delays and increased throughputs. Two such mechanisms, virtual slotting and pseudo-token-pass were previously proposed. A colli... View full abstract»

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  • Optimized antenna designs for meteor burst communications

    Publication Year: 1990, Page(s):868 - 872 vol.2
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (420 KB)

    Meteor burst (MB) link performance is highly sensitive to patterns of link antennas. This sensitivity is determined by the match of transmit and receive antenna power gain and polarization throughout the usable MB sky volume. An application of the METEORLINK computer model to optimize antenna designs versus range is described. The approach uses antenna elevation and azimuth angle densities created... View full abstract»

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