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A universal model for question-answering systems with special consideration of modern spread spectrum identification systems 一个针对现代扩频识别系统的通用问答系统模型
军事通信技术 Pub Date : 1988-10-23 DOI: 10.1109/MILCOM.1988.13511
W. Kleinhempel
{"title":"A universal model for question-answering systems with special consideration of modern spread spectrum identification systems","authors":"W. Kleinhempel","doi":"10.1109/MILCOM.1988.13511","DOIUrl":"https://doi.org/10.1109/MILCOM.1988.13511","url":null,"abstract":"The author considers question-answering (QA) systems with a number of platforms operating in a common space. The platforms are equipped with interrogators and/or with transponders. The goal of such QA systems is to obtain information about the characteristics of the platforms with transponders at the platforms with interrogators. A general model for QA systems is introduced. Based on this model, it is shown that the probability of identification, the information-theoretical efficiency, and the average cost are quantities suitable for evaluating QA systems. The theory is especially applicable to identification systems for friend or foe. For such a system the advantage offered by spread-spectrum techniques is determined.<<ETX>>","PeriodicalId":66166,"journal":{"name":"军事通信技术","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1988-10-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74868770","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}
引用次数: 0
An investigation of ARQ and hybrid FEC-ARQ on an experimental high latitude meteor burst channel 高纬度流星爆炸实验信道ARQ和混合FEC-ARQ的研究
军事通信技术 Pub Date : 1988-10-23 DOI: 10.1109/MILCOM.1988.13410
K. Brayer, S. Natarajan
{"title":"An investigation of ARQ and hybrid FEC-ARQ on an experimental high latitude meteor burst channel","authors":"K. Brayer, S. Natarajan","doi":"10.1109/MILCOM.1988.13410","DOIUrl":"https://doi.org/10.1109/MILCOM.1988.13410","url":null,"abstract":"An investigation of error control coding techniques on an experimental northern latitude meteor burst link is presented. Bit error patterns were obtained and the performance of automatic repeat request (ARQ) and hybrid forward error correction (FEC) with ARQ was examined from the standpoint of probability of message delivery and encountered delays with respect to the message delivery. It is demonstrated that FEC will yield orders of magnitude of improvement in the delivery of messages within a maximum time constraint. The potential gains in extending the usable time duration of a meteor burst channel are on the order of factors of four with successful delivery percentages increased by factors of 50.<<ETX>>","PeriodicalId":66166,"journal":{"name":"军事通信技术","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1988-10-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73005329","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}
引用次数: 18
A novel microprocessor based data communication system 一种基于微处理器的新型数据通信系统
军事通信技术 Pub Date : 1988-10-23 DOI: 10.1109/MILCOM.1988.13399
A. Saha, B. Mazumder
{"title":"A novel microprocessor based data communication system","authors":"A. Saha, B. Mazumder","doi":"10.1109/MILCOM.1988.13399","DOIUrl":"https://doi.org/10.1109/MILCOM.1988.13399","url":null,"abstract":"A novel method of economic transmission of parallel data over a pair of wires is described. The n-bit digital word X is encoded into a pulse of duration tau (X), where f(X), the reciprocal of tau (X) is proportional to the magnitude of X. At the receiver end, information is retrieved by converting f(X) back to X by a successive approximation logic f-to-D converter technique. Appropriate protocols have been formulated for smooth flow of data. Algorithms for transmission, reception, and protocols are implemented by developing software programs for the complete system using 8085 microprocessors.<<ETX>>","PeriodicalId":66166,"journal":{"name":"军事通信技术","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1988-10-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78590927","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}
引用次数: 0
An adaptive type-I hybrid-ARQ technique using the Viterbi decoding algorithm 采用Viterbi译码算法的自适应i型混合arq技术
军事通信技术 Pub Date : 1988-10-23 DOI: 10.1109/MILCOM.1988.13409
S. Wicker
{"title":"An adaptive type-I hybrid-ARQ technique using the Viterbi decoding algorithm","authors":"S. Wicker","doi":"10.1109/MILCOM.1988.13409","DOIUrl":"https://doi.org/10.1109/MILCOM.1988.13409","url":null,"abstract":"It is shown that the Viterbi decoding algorithm can be modified for use in a type-I hybrid-ARQ (automatic-repeat-request) scheme. Through proper definition, the partial path metrics can be made directly proportional to the error content in a received sequence. Retransmission requests are generated whenever all partial path metrics exceed a fixed threshold before decoding is completed. The threshold may be varied to balance reliability with retransmission frequency. The implementation of this scheme increases reliability performance by several orders of magnitude at the expense of minimal modification to the basic Viterbi decoder and, in some cases, a negligible decrease in throughput.<<ETX>>","PeriodicalId":66166,"journal":{"name":"军事通信技术","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1988-10-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75143688","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}
引用次数: 14
Large multibeam lens antennas for EHF SATCOM 用于超高频卫星通信的大型多波束透镜天线
军事通信技术 Pub Date : 1988-10-23 DOI: 10.1109/MILCOM.1988.13418
J. Montgomery, D. Runyon, J. Fuller
{"title":"Large multibeam lens antennas for EHF SATCOM","authors":"J. Montgomery, D. Runyon, J. Fuller","doi":"10.1109/MILCOM.1988.13418","DOIUrl":"https://doi.org/10.1109/MILCOM.1988.13418","url":null,"abstract":"The authors discuss a practical design for a 265-port multiple-beam antenna (MBA) for EHF military satellite communication (MILSATCOM). A constrained beamforming network (BFN) with several hundred feeds and seven port feed clusters is for the intended applications in terms of performance, complexity, weight, and power consumption, is established. The design of the dielectric lens is examined. The performance of the MBA is analyzed.<<ETX>>","PeriodicalId":66166,"journal":{"name":"军事通信技术","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1988-10-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77358324","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}
引用次数: 10
Performance analysis of the FAVR meteor burst communication system FAVR流星突发通信系统性能分析
军事通信技术 Pub Date : 1988-10-23 DOI: 10.1109/MILCOM.1988.13449
S.S.L. Chang
{"title":"Performance analysis of the FAVR meteor burst communication system","authors":"S.S.L. Chang","doi":"10.1109/MILCOM.1988.13449","DOIUrl":"https://doi.org/10.1109/MILCOM.1988.13449","url":null,"abstract":"The feedback adaptive variable-bit-rate system (FAVR) is a means of maximizing the throughput and minimizing the waiting time of a meteor-burst communication channel. It is shown that high reliability in automatic bit-rate identification can be realized with a small reduction in throughput as compared with an ideal variable bit-rate system. It is concluded that high throughput is achieved because the signal power is most effectively utilized and there is no overhead for conveying the bit-rate information. The system provides minimum waiting time because it makes use of weak bursts as well as strong bursts.<<ETX>>","PeriodicalId":66166,"journal":{"name":"军事通信技术","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1988-10-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79589164","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}
引用次数: 2
Telecommunications, local area networks, and computers-integrated network control 电信、局域网和计算机集成网络控制
军事通信技术 Pub Date : 1988-10-23 DOI: 10.1109/MILCOM.1988.13493
M. Freeman
{"title":"Telecommunications, local area networks, and computers-integrated network control","authors":"M. Freeman","doi":"10.1109/MILCOM.1988.13493","DOIUrl":"https://doi.org/10.1109/MILCOM.1988.13493","url":null,"abstract":"The author examines the telecommunications local area network, and computer-integrated network control system (TLC, INC) concept which uses modern network management principles to detect service-affecting problems so that corrective action can be applied to restore service. The information is presented to network managers on a high-resolution color graphic workstation in real time. An operation overview of the TLC, INC is presented, and attention is given to such features as global and site display, telecommunications, computer resources, controls, preplans, trend analysis, and performance, audit, and ad hoc reports.<<ETX>>","PeriodicalId":66166,"journal":{"name":"军事通信技术","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1988-10-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79849419","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}
引用次数: 0
Rapid prototyping network management systems 快速原型网络管理系统
军事通信技术 Pub Date : 1988-10-23 DOI: 10.1109/MILCOM.1988.13495
C. Noren
{"title":"Rapid prototyping network management systems","authors":"C. Noren","doi":"10.1109/MILCOM.1988.13495","DOIUrl":"https://doi.org/10.1109/MILCOM.1988.13495","url":null,"abstract":"The author presents a tutorial on the use of an expert shell in rapid prototyping of network management systems. Prototyping issues considered include the selection of an expert shell, software architecture, and the development cycle. It is concluded that expert-system shells provide a development environment that can dramatically boost productivity over conventional programming approaches and make rapid prototyping possible. It is noted that the frame- and rule-based nature of the shells fits well in real-time network configuration and fault analysis.<<ETX>>","PeriodicalId":66166,"journal":{"name":"军事通信技术","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1988-10-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81697607","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}
引用次数: 3
Projection codes for burst error correction in SSMA networks 用于SSMA网络突发纠错的投影码
军事通信技术 Pub Date : 1988-10-23 DOI: 10.1109/MILCOM.1988.13488
D. Manela, D. Schilling
{"title":"Projection codes for burst error correction in SSMA networks","authors":"D. Manela, D. Schilling","doi":"10.1109/MILCOM.1988.13488","DOIUrl":"https://doi.org/10.1109/MILCOM.1988.13488","url":null,"abstract":"The authors consider a multihop packet radio network, i.e., a spread-spectrum multiple-access (SSMA) network. The network by nature of its operation, has collisions, when two or more users share the same frequency bin at a given time. A solution to the collisions is available by introducing error-correcting codes into the transmitted data. A simple projection code which asymptotically approaches Reiger's bound is suggested and analyzed. Unlike the Reed-Solomon code the projection code is not subject to algebraic constraints and can be easily adjusted to any system parameters such as packet size, code rate, number of bits per hop, and modulation alphabet. The code's structure, features, performances, and implementation, and its advantages over other codes are described.<<ETX>>","PeriodicalId":66166,"journal":{"name":"军事通信技术","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1988-10-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76559581","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}
引用次数: 0
DoD support for OSI protocols 国防部支持OSI协议
军事通信技术 Pub Date : 1988-10-23 DOI: 10.1109/MILCOM.1988.13414
P. Gross, G. Reichlen
{"title":"DoD support for OSI protocols","authors":"P. Gross, G. Reichlen","doi":"10.1109/MILCOM.1988.13414","DOIUrl":"https://doi.org/10.1109/MILCOM.1988.13414","url":null,"abstract":"The Defense Communications Agency has developed a strategy for the adoption of the GOSIP (Government OSI profile) defined open system interconnection (OSI) protocols within the Department of Defense (DoD). The cornerstone of the DoD's OSI migration strategy is coexistence and interoperability with the DoD protocols through progressive stages of implementation. Coexistence and interoperability are discussed with respect to the dual-protocol host, selected application-layer interoperability, internetwork-level OSI connectivity, and publicly available OSI software.<<ETX>>","PeriodicalId":66166,"journal":{"name":"军事通信技术","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1988-10-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89976253","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}
引用次数: 0
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