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Military Communications Conference, 1983. MILCOM 1983. IEEE

Date Oct. 31 1983-Nov. 2 1983

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  • [Cover]

    Page(s): C1
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    Freely Available from IEEE
  • 1983 IEEE Military Communications Conference

    Page(s): i
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  • Copyright page

    Page(s): ii
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  • Contents

    Page(s): iii
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  • Executive Committee

    Page(s): iv
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  • Patrons

    Page(s): iv
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  • Schedule of Sessions

    Page(s): v - vii
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  • Papers Presented

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  • Tutorials [breaker page]

    Page(s): xxv
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  • Author index

    Page(s): xxvi - xxix
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  • The Impact of Wavelength Division Multiplexing on Fiber Optic Radar Remoting

    Page(s): 584 - 588
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    Some military radars presently employ frequency division multiplexing (fdm) and time division multiplexing (tdm) techniques, while others simply use multiple wire paths to remote the radars from their operations shelters (OPS). In addition to electronic multiplexing techniques, optical wavelength division multiplexing (wdm) is considered here as a candidate approach for further development in fiber optic radar remoting. For a large number of signals, one or two levels of electronic multiplexing are appropriate followed by a final layer of multiplexing selected from wdm, tdm, or fdm. Several of the radars considered already use electronic multiplexing to reduce the number of signal paths down to two or three. The wdm approach introduces the additional possibility of bidirectional transmission on a single fiber to reduce cabling costs and connectoring requirements, and because of its compatibility with any signal type, it has the potential to become a universal multiplexer approach suitable for use in all the radars considered here. View full abstract»

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  • An Approach to Implementing the Line Seize Protocol in Military Fiber Optics Networks

    Page(s): 589 - 596
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    The Line Seize Protocol is capable of providing the high performance demanded by sophisticated distributed C3 Battle Management systems. Force status and sensor data must be promptly collected and delivered to command centers where command decisions must be reached and resulting command delivered with minimum delay. Since these systems must operate in highly stressed environments, provision must be made for cooperative and synchronous interfacing with back-up systems, graceful degradation, adaptability to changing network topology, and communications security. This protocol provides several advantages that are important in military applications. In particular, a message will always follow the shortest existing path between a source-destination pair of nodes. Moreover, routing decisions, message collisions and queueing delays are eliminated. In addition, since all nodes, including command nodes, receive every message, complete distributed control of the system is possible. When the high data rates and inherent survivability of FO transmission systems are combined with the Line Seize Protocol, the result is a robust, high performance communication system that has potential applications to both tactical and strategic C3/Battle Management systems. An approach to implementing the Line Seize Protocol in a hybrid FO/Radio network is presented and the resulting performance is described parametrically in terms of system requirements. This involves discussion of EDAC, COMSEC, and jamming protection procedures, Line Seize Modem design, and nodal architecture. View full abstract»

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  • The Evolution of Fiber Optic Serial Interfaces in Naval Tactical Data Systems

    Page(s): 597
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    Implementation of new interfaces in Naval Combat Systems is an evolutionary process. It is essential to provide a means of transition from the "old" to the "new" so as to retain interoperability between all elements of the system during their life cycle. This paper describes the evolution of fiber optic serial interfaces in U.S. Naval Tactical Data Systems. Planned implementation of fiber optic interfaces in the new U.S. Navy Standard Shipboard Computers, AN/UYK-43 & 44, are discussed, as well as future requirements for higher speed bus oriented interfaces which more fully utilize the wide bandwidth of fiber optic media and support the distributed system architecture of the future. View full abstract»

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  • Military Applications of a Commercial Digital Switching Family

    Page(s): 599 - 603
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    An existing family of commercial digital switches is an attractive basis upon which to implement the traditional and unique military features required in the emerging Defense Switched Network (DSN). The extensive Northern Telecom DMS family of commercial digital switches is discussed. Particular attention is given to the techniques that were utilized to add the military features and integrate them into the existing system software. System definition problems and their solutions are also covered. View full abstract»

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  • On the Reconstitution of the National Telecommunications Resource

    Page(s): 604 - 607
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    The National Telecommunications Resource consists of a large number of disparate switched and non-switched telecommunications systems. By and large they only interoperate at a "service" level, e.g., prearranged voice bands strapped together at a central office. Most can be made interoperable from a technical standpoint. Some interoperability scenarios may be economically viable, most are not. The operational and institutional problems associated with achieving the desired result can be formidable. During the trans-attack and post-attack period of a nuclear attack, a cascading set of events could be set in motion in the United States which have been the subject of debate for many years. Today, the preponderance of telecommunications in the United States is non-Government owned; thus, the creation of a reconstitutible configuration is, at best, a monumental undertaking. Some say it is an unachievable objective. This paper discusses, guardedly, the objectives, issues and perspectives of this National problem. View full abstract»

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  • Voice Teleconferencing - A Wide Variety of Demanding Transmission and Control Solutions

    Page(s): 608 - 614
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    The transmission and control environment for teleconferencing is a difficult one. Transmission impairments are multiplied; call establishment procedures are complicated. Time division techniques permit flexibility in connectivity and an easier implementation of control functions. They also allow sophisticated bridging networks for C3 applications and (perhaps) encrypted teleconferencing. View full abstract»

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  • Optimization and Conceptual Design of Demonstration Military and Civilian Mobile Satellites using Existing Buses

    Page(s): 615 - 619
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    The Canadian Mobile Satellite (MSAT) program, as it was initially conceived, was intended to demonstrate the feasibility of providing reliable communications, via a geosynchronous satellite, to a variety of users operating in different bands. The spacecraft was intended to carry both military and civilian payloads. Each of these payloads was to have been comprised of multiple transponders. The spacecraft bus was to have been selected from amongst existing designs to meet the needs of the mission. Careful evaluation of possible host spacecraft, and the detailed optimization of the civilian users payload for a complex number of parameters, led to the conclusion that the use of an existing bus for the proposed shared mission was cost effective and technically feasible. Additionally, it was concluded that the information to be gained through participation in such programs can provide useful experience on which future operational military mobile satellite systems can be optimized. Finally, alternative conceptual designs were developed for a purely military mission. Examples of such designs for the RCA Satcom and Ford Aerospace Intelsat V buses are presented. View full abstract»

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  • Processor for Multiple, Continuous, Spread Spectrum Signals

    Page(s): 620 - 625
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    A circuit is described which accepts the linear sum of several continuous (CW) direct sequence, spread spectrum signals, and outputs a sequence of narrow pulses, each of which contains all the available energy of one of the input signals over some longer predetermined interval of time. The circuit reduces the problem of continuously processing several simultaneous signals to a sequential pulse processing operation, effectively timesharing the same single set of circuitry. Both amplitude and phase information is preserved through the processing technique, allowing implementation in coherent and noncoherent system architectures. In addition to optimum performance and circuit economy, the circuit offers a high degree of design flexibility, particularly in the area of critical timing and interface with digital signal processors. This circuit can be applied directly to a Global Positioning System (GPS) processor. The design of a GPS receiver/processor utilizing this scheme is presented in this paper. Other unique features of the design include using high throughput vector processors to perform rapid doppler frequency search and carrier/code synchronization. A GPS acquisition time which is much shorter than most conventional approaches can then be achieved. View full abstract»

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  • A VLSI Reed-Solomon Decoder Architecture for Concatenate-Coded Space and Spread Spectrum Communications

    Page(s): 626 - 630
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    In this paper, a VLSI Reed-Solomon (RS) decoder architecture for concatenate-coded space and spread spectrum communications, is presented. The known decoding procedures for RS codes are exploited and modified to obtain a repetitive and recursive decoding technique which is suitable for VLSI implementation and pipeline processing. View full abstract»

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  • Spread-Spectrum CDMA Synchronization for a Voice Conference Modem

    Page(s): 631 - 635
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    A direct-sequence spread-spectrum modem utilizing intra-network code-division multiple access (CDMA) was designed to provide jam resistance, conferencing, and security for tactical voice communications among aircraft and ground controllers. The approach used for PN code acquisition is described. An approximate analysis is developed which accounts for the interdependence of the signal and noise estimates. Techniques used to mitigate the effects of narrowband interference upon the noise estimation accuracy are described and analyzed. View full abstract»

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  • Probability of Error Measurement for an Interference Resistant Transform Domain Processing Receiver

    Page(s): 636 - 640
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    In this paper, the results of implementing a transform domain processing spread spectrum receiver are presented. Measured probability of error results for single tone interference conditions are compared to analytical results, and the improvement in system performance achievable by using a notch filter to attenuate the narrowband interference is demonstrated. The theoretical and experimental results agree very well. Measured probability of error results are also presented for an adaptive system where the notch filter tracks the center frequency of the interferer. View full abstract»

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  • An Analysis of Optimum Interference Excision Filter for Spread Spectrum Systems

    Page(s): 641 - 644
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    The performance of an optimum filter is analyzed and compared to that of a whitening filter and a conventional matched filter for rejecting interference in spread spectrum systems. It is shown that the performance analysis of the optimum filter can be greatly simplified by formulating the detection process in the discrete-time domain and modeling the noise as a Markov process. In this formulation, the relative processing gain of the optimum filter over other types of filter can be easily calculated and the effect of filtering operations on inter-symbol interference can be clearly demonstrated. Specifically, closed form expressions for the filter performance in the presence of interference is derived for a BPSK spread spectrum system. View full abstract»

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  • A Fully Distributed Approach to the Design of a 16 Kbit/Sec VHF Packet Radio Network

    Page(s): 645 - 649
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    The increasing use of computer based equipments in weapons systems and their associated sensors and command and control elements and the trend from voice to data communications have been responsible for formulating the requirement for robust data communications systems for use in the Forward Area Tactical Environment. This paper describes the philosophy, design and performance of a fully distributed medium speed Packet Radio network for providing survivable data communications in a hostile electromagnetic environment. View full abstract»

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  • Distributed Time Division Multiple Access (DTDMA) - Principles and Analysis Techniques

    Page(s): 650 - 660
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    The principles of Distributed Time Division Multiple Access (DTDMA) technology are delineated. DTDMA is currently being implemented as the U.S. Navy's Joint Tactical Information Distribution System (JTIDS) in a full scale development program. This effort is under contract to TADCOM, a joint venture of ITT Avionics Division and Hughes Aircraft Company. JTIDS is a spread spectrum system which supports concurrent multi-CNI function (Communication, Navigation and Identification), multi-terminal and multi-net operation. Efficiency, flexibility and high jamming resistance is obtained by utilizing in its design the three ambiguities of signal space: time, frequency and code; and also sharing terminal resources among all of the functions (integrated CNI system). A combined simulation/analytic technique is described which provides design information and predicts terminal capacity and anti-jam performance trade-offs, for both digital data and digital voice data links. View full abstract»

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  • Performance of a Transmitter Diversity MSK Mobile Radio System with Two Bit Differential Detection

    Page(s): 661 - 665
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    The error rate performance of a transmitter diversity using frequency offset MSK signals and 2 bit differential detection in land mobile radio communication systems is derived under the general conditions of additive Gaussian noise, cochannel interference and fast Rayleigh fading. Numerical results and useful design curves are presented for cases of practical interest and compared with the case of no diversity. Transmitter diversity can be used in the base stations when simplicity is required in the receiver at the mobile units. View full abstract»

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