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Military Communications Conference, 1993. MILCOM '93. Conference record. Communications on the Move., IEEE

Date 11-14 Oct 1993

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  • A second-order delay-locked loop of a spread spectrum receiver

    Publication Year: 1993, Page(s):809 - 813 vol.3
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (304 KB)

    The tracking performance of 2nd-order delay-locked loops (DLL) with high gain for PN code chip synchronization is theoretically analyzed and evaluated by means of a Fokker-Planck equation. The results show that the steady state probability density function of normalized delay error of 2nd-order DLL with high gain is similar to that of a lst-order DLL; for the same mean-squared tracking jitter, the... View full abstract»

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  • Efficient use of SATCOM resources in MSE networks (DAMA for MSE)

    Publication Year: 1993, Page(s):768 - 773 vol.3
    Cited by:  Papers (2)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (512 KB)

    The evolving AirLand Operations (ALO) concept of force deployment in the tactical arena significantly alters requirements for command, control, and communications. Communications must be maintained between widely separated groups of users (enclaves) who cannot be adequately serviced by traditional terrestrial networks. Satellite communications (both military and commercial) have been proposed as o... View full abstract»

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  • Performance of DS/CDMA communications with continuous-phase signals

    Publication Year: 1993, Page(s):748 - 752 vol.3
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (424 KB)

    Two examples of Direct-Sequence Code Division Multiple Access (DS/CDMA) communication systems with offset quadrature signals and smoother chip pulses than the rectangular pulse of the conventional Offset Quadrature Phase Shift Keying (OQPSK) modulation are presented. The two systems use Minimum Shift Keying (MSK) and Sinusoidal Frequency Shift Keying (SFSK), which are continuous-phase modulation f... View full abstract»

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  • Army Advanced Communications Technology Satellite (ACTS) mobile terminal (AAMT)

    Publication Year: 1993, Page(s):814 - 820 vol.3
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (664 KB)

    The National Aeronautics and Space Administration (NASA), through the Jet Propulsion Laboratory (JPL), has developed a commercially oriented ACTS Mobile Terminal (AMT). This vehicular terminal employs a mechanically-steered antenna, and can support either digital links up to 64 kbps or analog links. The Army has now contracted JPL to modify this terminal for Army demonstration purposes. The AMT ha... View full abstract»

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  • Distributed information environment for Defense Information System Network (DISN)- far term

    Publication Year: 1993, Page(s):1044 - 1047 vol.3
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (300 KB)

    With DISN as a focus for future DoD networking R&D needs, firm alliances among the three services for joint, cooperative R&D and effective partnerships with industry and the academic communities the time has never been better for making major advances in the information infrastructure that will support command and control of the future. The first part of this paper considers the Joint Dire... View full abstract»

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  • MSE network control in a mobile environment

    Publication Year: 1993, Page(s):869 - 873 vol.3
    Cited by:  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (380 KB)

    The Mobile Subscriber Equipment (MSE) currently in use by the US Army comprises a network of communications equipment designed to provide total telecommunications service to an Army Corps and its attached Divisions. Control of the network is accomplished by use of the System Control Center (SCC). An overview of the MSE network is provided, with particular emphasis on the portions of the system inv... View full abstract»

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  • A LAN-based communications processor for tactical applications

    Publication Year: 1993, Page(s):897 - 901 vol.3
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (308 KB)

    Today's Army Tactical Command and Control System consists of systems that rely on a widely disparate set of communications media equipment, communications networks, and information exchange protocols to exchange information across the battlefield. The future trend in tactical communications is to provide a seamless information network which bridges the communications networks and protocols through... View full abstract»

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  • Performance of trellis coded modulation with 8PSK through TDRSS

    Publication Year: 1993, Page(s):963 - 967 vol.3
    Cited by:  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (356 KB)

    The need to increase data-rate capabilities of the Tracking and Data Relay Satellite System (TDRSS) has prompted NASA to investigate bandwidth-efficient modulation schemes. Based upon current technology the most promising scheme is Trellis-Coded Modulation (TCM) operating with Octal Phase Shift Keying (8 PSK). In conjunction with NASA, New Mexico State University's Manuel Lujan Jr. Center for Spac... View full abstract»

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  • Exploring link activation scheduling with varying network organizations

    Publication Year: 1993, Page(s):927 - 932 vol.3
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (504 KB)

    This paper explores the effects of varying network organization on the problem of scheduling link activations in multihop shared channel access networks. It shows that the problem may be viewed as a distributed constraint satisfaction problem. Using a distributed planning system, DCONSA, the authors have conducted a set of experiments which illustrate the tradeoffs involved in scheduling link acti... View full abstract»

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  • A dual use fiber optic video and audio link

    Publication Year: 1993, Page(s):858 - 863 vol.3
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (520 KB)

    Dissemination of daily events throughout the world could not happen so expeditiously and with such a high degree of clarity if it were not for the significant investment in dual purpose technology breakthroughs in satellite, radio and fiber optic communications. The world has no boundaries and when a calamity strikes, all nations are immediately informed and volunteer their help. From experience t... View full abstract»

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  • Mobile imagery systems using commercial technology

    Publication Year: 1993, Page(s):848 - 852 vol.3
    Cited by:  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (484 KB)

    Considerable improvement in satellite channel capacity utilization is achievable through application of compression technology to military communications, especially secondary imagery systems. Standards activities are producing uniform and powerful compression algorithms. In addition, the NITFS standardizes the format of digital imagery and imagery related data. NITFS incorporates JPEG and will in... View full abstract»

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  • Future Navy support of joint operations using enhanced SHF SATCOM capabilities

    Publication Year: 1993, Page(s):838 - 842 vol.3
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (384 KB)

    The Navy is expanding its communications capabilities in support of joint tactical operations. The use of Super High Frequency (SHF) satellite communications (SATCOM) is greatly expanding across the fleet. As this expansion evolves, the Navy will use new networking approaches to increase communications flexibility and make efficient use of assigned satellite resources. This paper presents new conc... View full abstract»

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  • Adaptive two-stage detection scheme in synchronous two-user CDMA systems

    Publication Year: 1993, Page(s):774 - 778 vol.3
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (280 KB)

    An adaptive two-stage scheme for a synchronous, two-user CDMA environment with unknown received signal energies is presented. It consists of a tandem of the matched filter front-end followed by the interference canceler whose weights are adjusted by an adaptive algorithm. The error probability was evaluated analytically, and it was shown that the receiver provides satisfactory performance in the n... View full abstract»

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  • Mean acquisition time for noncoherent PN sequence sequential acquisition schemes

    Publication Year: 1993, Page(s):784 - 788 vol.3
    Cited by:  Papers (2)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (404 KB)

    Sequential PN code acquisition schemes have the potential to achieve the best performance, but they are the least analyzed because of the analytical difficulties. The authors have proposed and investigated (1991-92) the truncated sequential probability ratio test (TSPRT) for spread-spectrum noncoherent PN code acquisition. It was shown to be much better than the conventional fixed sample size (FSS... View full abstract»

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  • Code acquisition by binary autodirective search

    Publication Year: 1993, Page(s):794 - 798 vol.3
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (440 KB)

    This paper presents a new method for rapidly acquiring code synchronization in direct sequence spread spectrum communication systems. Traditional search methods look for code synch by sequentially stepping the phase of a locally generated copy of the spreading code and examining the result of correlating that code with the received signal. In contrast, the non-sequential binary autodirective metho... View full abstract»

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  • Capacities of hybrid FDMA/CDMA systems in multipath fading

    Publication Year: 1993, Page(s):753 - 757 vol.3
    Cited by:  Papers (7)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (284 KB)

    A hybrid FDMA/CDMA scheme is described and analyzed. The performance of the hybrid system is then compared with that of a wideband CDMA system occupying the same total bandwidth. It is found that, while the hybrid system has properties which may be desirable in certain situations, such as the flexibility of using a non-contiguous spectrum, in a multipath fading environment a wideband CDMA system h... View full abstract»

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  • Combined coding and modulation for wireless communication using multidimensional PSK signal constellations

    Publication Year: 1993, Page(s):1023 - 1027 vol.3
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (396 KB)

    Combined coding and modulation or trellis coding techniques offer the potential for significant coding gains with little or no bandwidth expansion. Although the combination of spectral and energy efficiency make trellis codes potentially useful for terrestrial wireless systems, they have not been widely deployed due to the hostile multipath fading channel. This paper examines several approaches to... View full abstract»

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  • Systems engineering and performance evaluation for the Defense Information Systems Network

    Publication Year: 1993, Page(s):1063 - 1068 vol.3
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (476 KB)

    This paper presents systems engineering and performance analysis and evaluation concepts for planning, designing, operating, and managing the Defense Information Systems Network (DISN). The DISN uses Asynchronous Transfer Mode (ATM) high-speed communications services to support a wide class of applications that require high-speed networking and will provide multi-media conferencing, distributed si... View full abstract»

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  • Definition of a commercial mobile satellite services network to meet DoD communications needs

    Publication Year: 1993, Page(s):821 - 825 vol.3
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (392 KB)

    Commercial-based satellite networks have the potential to provide cost effective communications support for the Department of Defense (DoD's) less critical needs which include administration, logistics, and other support functions. This paper summarizes the definition of a possible multi-vendor Mobile Satellite Services (MSS) network architecture. A determination is presented as to what degree exi... View full abstract»

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  • Anti-jamming properties of a DS-CDMA equalization filter

    Publication Year: 1993, Page(s):1008 - 1012 vol.3
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (348 KB)

    An adaptive tapped delay line equalizer is described which operates in a DS-CDMA receiver. This structure, without modification, can be applied to make the system insensitive to spectral inefficiency of the transmitted pulse shape (by rejecting multiple-access noise), to act as a RAKE in the presence of multipath interference, and to reject narrowband interference. The latter property is the main ... View full abstract»

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  • Defense Information System Network (DISN) - An overview

    Publication Year: 1993, Page(s):1048 - 1052 vol.3
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (352 KB)

    This overview of DISN is a summary of what DISN is today, tomorrow and a projection of the future. It begins with a large number of non-integrated legacy networks that are substantial in size and the initial integration of these systems to improve performance and reduce cost. Emerging requirements for image, voice and data are projected to push DISN into the gigabit arena to support the informatio... View full abstract»

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  • Network requirements for a satellite based National Research and Education Network

    Publication Year: 1993, Page(s):993 - 997 vol.3
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (512 KB)

    All of the various research networks throughout the US are planned to be integrated into a single, nationwide research network by the mid 1990's. This network will be the third stage of what will be called the National Research and Education Network (NREN). A wide-band communications satellite creates a distance insensitive link between all users, regardless of their locations. In order to assure ... View full abstract»

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  • NPT - A success story evolving from teamwork and innovation

    Publication Year: 1993, Page(s):874 - 878 vol.3
    Cited by:  Papers (7)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (488 KB)

    This paper provides a functional description of the Network Planning Terminal (NPT) and describes both the teamwork between internal Government organizations and the systems integration process that resulted in the success of the NPT program. This success highlights the power of Total Quality Management based working groups, the involvement of soldiers, and the cooperative efforts of RD&E prog... View full abstract»

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  • Analysis of two trunk congestion relief schemes

    Publication Year: 1993, Page(s):902 - 906 vol.3
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (364 KB)

    During natural disasters such as earthquakes and hurricanes, call volume in the public switched network (PSN) often increases to levels that cause trunk overloads in switches. The result of this overload is an overall degradation in the grade-of-service of the PSN. At times like these it is vitally important that local, state, and federal officials be able to communicate in a reliable and timely m... View full abstract»

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  • Structural properties of a low Earth orbit satellite constellation - the Walker delta network

    Publication Year: 1993, Page(s):968 - 972 vol.3
    Cited by:  Papers (6)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (472 KB)

    The Walker (1984) delta satellite constellation appears to be practical to serve as a low Earth orbit satellite network to provide world-wide networking. The structural properties of the Walker delta network, including diameter, mean message traversal, traffic density, and network saturation conditions are investigated and presented. Three different traffic patterns are used in this study. It has ... View full abstract»

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