{"title":"Zebra-multi-channel digital modular radio: architecture and performance","authors":"J. Bard, B.J. Bryan, T.C. Colvin","doi":"10.1109/MILCOM.1997.644963","DOIUrl":"https://doi.org/10.1109/MILCOM.1997.644963","url":null,"abstract":"This paper presents the design and performance of a multi-channel SATCOM/LOS UHF receiver known as Zebra manufactured by Mnemonics, Inc., Melbourne, FL. The current four channel receiver debuted at the Joint Warrior Interoperability Demonstration (JWID-1996). Zebra employs an open architecture design based on commercial off-the shelf (COTS) single board computers communicating with proprietary UHF receiver modules and embedded cryptographic devices over a Versa Module Eurocard (VME) databus. Interprocessor communication within Zebra relies on a TCP/IP transport layer that allows dynamic re-routing of data streams to support a variety of tactical data links with any number of receiver channels and embedded or external cryptographic devices. A single VME receiver module (VRM) provides a programmable capability to downconvert, demodulate, de-interleave and forward error correct a variety of UHF signals. Encrypted digital data from the VRM is presented to a Zebra crypto module (ZCM) for decryption through an embedded CDH. A recent manifestation of Zebra supports simultaneous reception and dissemination of data products from four of the following tactical data links: TRE Related APplications (TRAP), TActical Data Information eXchange System-B (TADIXS-B), Tactical Information Broadcast Service (TIBS), Officer in Tactical Command Information eXchange Service (OTCIXS), Secondary Imagery Dissemination System (SIDS) or Line-Of-Sight TActical Data Information Link II (LOS TADILA).","PeriodicalId":351392,"journal":{"name":"MILCOM 97 MILCOM 97 Proceedings","volume":"215 2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-11-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122383411","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Adaptive coding for slotted DS-SSMA packet radio systems","authors":"Qian T. Zhang, T. Wong, J. Lehnert","doi":"10.1109/MILCOM.1997.648720","DOIUrl":"https://doi.org/10.1109/MILCOM.1997.648720","url":null,"abstract":"In order to achieve adaptive coding, the type-II hybrid ARQ protocol is applied to a slotted direct-sequence spread-spectrum multiple-access (DS-SSMA) packet radio system with a finite number of users. Two-dimensional Markov chains are employed to model the system dynamics. Based on this model, the performance of the type-II hybrid ARQ protocol is upper and lower bounded by considering, respectively, a superior scheme and an inferior scheme. The steady state throughput and delay performance of the two bounding schemes are obtained. Moreover, the optimal retransmission policy is found for each fixed input load.","PeriodicalId":351392,"journal":{"name":"MILCOM 97 MILCOM 97 Proceedings","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-11-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122140871","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Trellis extracted synchronisation techniques applicable to automatic link establishment","authors":"B. Hunt, B. Honary, M. Maundrell, P. Arthur","doi":"10.1109/MILCOM.1997.648662","DOIUrl":"https://doi.org/10.1109/MILCOM.1997.648662","url":null,"abstract":"With the ever increasing interest in automatic link establishment (ALE) and adaptive radio systems, there is much research being carried out to try and improve the performance of such systems. As well as looking at completely new systems, there is also interest in improving the performance of systems complying to the US MIL-STD 188-141A, as this is the currently established standard in this area. It has previously been shown how a new trellis structure for the (24,12) Golay code can be used to obtain the soft decision maximum likelihood of this code, which allows an improvement of a MIL-STD compliant system, without affecting its compliance. This paper addresses several techniques for making use of this trellis structure to allow maximum likelihood, or near maximum likelihood, block synchronisation within a MIL-STD compliant system.","PeriodicalId":351392,"journal":{"name":"MILCOM 97 MILCOM 97 Proceedings","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-11-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128456212","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"A comparison of DSCS and commercial satellite communications service requirements","authors":"P.D. Maurer","doi":"10.1109/MILCOM.1997.645004","DOIUrl":"https://doi.org/10.1109/MILCOM.1997.645004","url":null,"abstract":"Several key network operating principles separate the Defense Satellite Communications System (DSCS) system design and implementation from that of INTELSAT and other commercial satellite communications systems. Technical issues of paramount importance to operation on the INTELSAT system are often considered foreign by the military satellite communications (MILSATCOM) community, and these issues are highlighted. For example, frequency reuse by polarization isolation is a key aspect of INTELSAT and other commercial communications satellites. This imposes certain requirements on Earth station design and performance which are not necessary for operation over DSCS III spacecraft. A general background of governing system design and service implementation requirements is given to clarify and explain the foundations on which the INTELSAT access procedure is based. The issues and rationale behind link analyses are contrasted with DSCS, and general systems concepts are discussed which explain how Earth terminal certification and service implementation are carried out. A simplified process is outlined for accessing the INTELSAT space segment.","PeriodicalId":351392,"journal":{"name":"MILCOM 97 MILCOM 97 Proceedings","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-11-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128966592","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"On the performance of a medium access control scheme for the reconfigurable wireless networks","authors":"Zygmunt J. Haas","doi":"10.1109/MILCOM.1997.645029","DOIUrl":"https://doi.org/10.1109/MILCOM.1997.645029","url":null,"abstract":"We propose a MAC protocol for an ad-hoc network architecture, termed the reconfigurable wireless networks, and investigate its network capacity. We discuss the access synchronization and the construction of the network connections features of the MAC protocol. Using event-driven simulation, we evaluate the performance of the scheme demonstrating its behavior for different mobility and traffic parameters, and examine propagation models.","PeriodicalId":351392,"journal":{"name":"MILCOM 97 MILCOM 97 Proceedings","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-11-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129459168","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Advanced bandwidth efficient block coded modulation over fading channels","authors":"R. Edwards, B. Honary, S. Farquhar, A. Noble","doi":"10.1109/MILCOM.1997.646731","DOIUrl":"https://doi.org/10.1109/MILCOM.1997.646731","url":null,"abstract":"A high performance block coded modulation technique using a concatenated phase/frequency signal constellation is introduced. The coded modulation schemes described have very large minimum squared Euclidean distance (MSED) and are bandwidth efficient with reference to uncoded QPSK, giving gains of up to 15 dB over the AWGN channel. Simulation results are presented over AWGN and fading channels. An appropriate mapping of an encoder to a partitioned constellation will increase the MSED of a coded modulation scheme and thus improve the error performance. Using a phase/frequency modulation technique which produces signals varying both in phase and frequency, we describe a method to expand such a modulation scheme from four to eight dimensions, and-using a single parity check (SPC) code-provide a new modulation scheme with increased MSED. This new modulation scheme is then combined with RS codes over GF(128) to construct bandwidth efficient coding schemes giving large coding gains.","PeriodicalId":351392,"journal":{"name":"MILCOM 97 MILCOM 97 Proceedings","volume":"34 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-11-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129096399","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Light-weight transportable 2.4-meter tri-band antenna system for commercial and military satellites","authors":"J. Cleveland, S. Parekh, A. Johnson","doi":"10.1109/MILCOM.1997.648713","DOIUrl":"https://doi.org/10.1109/MILCOM.1997.648713","url":null,"abstract":"An essential element of rapid response to contingencies is the ability to quickly establish satellite communications with the deployed forces. The contingency environment embodies factors such as little or no warning, a short response time, high visibility and small tolerance for failure. A key to success under these conditions is the ability for rapid transportation and installation of reliable communications services. This paper discusses the performance of a commercial, transportable tri-band satellite antenna system designed and constructed for short assembly times. The system consists of a model 62A-6 light-weight, tri-band antenna system that supports Intelsat and DSCS operation over the SHF frequency spectrum. The 62A-6 system consists of a 2.4-meter diameter reflector with an offset feed system, an elevation-over-azimuth positioner and a model C-30 antenna controller. The \"flyaway\" antenna breaks down into nine separate reflector panels. The reflector, motorized positioner, and feedhorn antenna assemblies are transportable in transit cases as standard air freight on commercial or military aircraft. The reflector consists of composite material and honeycomb sandwich construction to produce a lightweight, but extremely stiff reflector.","PeriodicalId":351392,"journal":{"name":"MILCOM 97 MILCOM 97 Proceedings","volume":"82 3","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-11-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120868037","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"A network management proxy agent development for the Defense Information Systems Agency (DISA) IP router-based networks using the Web technology","authors":"J. Boyle, N. Nour, H. Truong","doi":"10.1109/MILCOM.1997.644968","DOIUrl":"https://doi.org/10.1109/MILCOM.1997.644968","url":null,"abstract":"The MITRE Corporation in support of the Defense Information Systems Agency (DISA) has developed a proxy agent functionality that allows DISA's major customers to have a network management status view of the DISA's IP router-based networks. The network management proxy agent, which operates at the element management level of the router network management hierarchy, has been developed using the World Wide Web (WWW) technology. To provide this functionality, MITRE has developed a network management Web server (NMWS) software that takes information from DISA's network management system (NMS), namely Hewlett Packard's Open View (HPOV) software and publishes it on the Web. This software, which is a collection of Perl scripts that run on a dedicated NMWS host, takes X windows screens from HPOV, converts them to GDF files, and publishes them on a Web server. In addition, the NMWS software provides a non-graphical form-based interface to the HPOV database to provide a near real-time status of circuits that are identified by their IP addresses or customer circuit service descriptor (CCSDs) to DISA's customers. The NMWS software was developed and operates on Solaris 2.5 with an X11R5 distribution. Network users access the NMWS host via their Web browser and are presented with (1) a list of available views, which is the same as the views on the screen of the NMWS host at the time of the last NMWS invocation, and (2) a form, which may be used to provide access circuit status using the text file of the Open View database. They can pull down a view via the Hyper Text Transfer Protocol (HTTP) and with most browsers this view will automatically update. This paper discusses the results of our testing and experimentation, and our lessons learned and recommendations for using a Web-based approach for network management of large networks.","PeriodicalId":351392,"journal":{"name":"MILCOM 97 MILCOM 97 Proceedings","volume":"37 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-11-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116307599","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"CDMA cellular architecture, for army tactical communications","authors":"J. Staba, T. Vaga, T. Dennis, I. Sharret","doi":"10.1109/MILCOM.1997.644978","DOIUrl":"https://doi.org/10.1109/MILCOM.1997.644978","url":null,"abstract":"This paper explores enhancements to the MSE (mobile subscriber equipment) mobile services by adding commercial CDMA cellular terminals (based on the IS-95 standard), base stations and mobile telephone switching offices (MTSO). Three alternative architectures for distributed cellular control of IS-95 CDMA were compared in terms of cost and MSE network utilization. The three alternatives are: 1) remoted MTSO; 2) hybrid MTSO; and 3) fully distributed MTSO. Network performance for each of these alternatives was modeled using COMNET III. Each architecture approach was also demonstrated in a laboratory environment.","PeriodicalId":351392,"journal":{"name":"MILCOM 97 MILCOM 97 Proceedings","volume":"59 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-11-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124118722","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Errors in high frequency automatic link establishment radios","authors":"R. Lay","doi":"10.1109/MILCOM.1997.646774","DOIUrl":"https://doi.org/10.1109/MILCOM.1997.646774","url":null,"abstract":"Error correcting techniques used by high frequency automatic link establishment (HFALE) radios, including those with link protection, transform a basic 24-bit ALE word into 147 bits to be transmitted and received. This paper examines the effect errors in the 147 received bits have on the received 24-bit ALE word.","PeriodicalId":351392,"journal":{"name":"MILCOM 97 MILCOM 97 Proceedings","volume":"74 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-11-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126470773","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}