Pub Date : 1988-10-23DOI: 10.1109/MILCOM.1988.13386
A. Akinpelu, A. Deacon, J. Shieh
The authors propose a distributed military premises network architecture (DIPNET) for a wide range of campuslike military premises integrated services digital network (ISDN) applications. DIPNET is to offer integrated voice, data, and video services to the end-users for both premises network and network interface applications, and it has taken the network security, survivability, reconfigurability, and ISDN interface requirements into the design considerations. DIPNET conforms with the military communications goals of standardized interfaces and intelligent premises networks.<>
{"title":"A distributed military premises network architecture for campus-like applications","authors":"A. Akinpelu, A. Deacon, J. Shieh","doi":"10.1109/MILCOM.1988.13386","DOIUrl":"https://doi.org/10.1109/MILCOM.1988.13386","url":null,"abstract":"The authors propose a distributed military premises network architecture (DIPNET) for a wide range of campuslike military premises integrated services digital network (ISDN) applications. DIPNET is to offer integrated voice, data, and video services to the end-users for both premises network and network interface applications, and it has taken the network security, survivability, reconfigurability, and ISDN interface requirements into the design considerations. DIPNET conforms with the military communications goals of standardized interfaces and intelligent premises networks.<<ETX>>","PeriodicalId":66166,"journal":{"name":"军事通信技术","volume":"280 1","pages":"169-173 vol.1"},"PeriodicalIF":0.0,"publicationDate":"1988-10-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83089078","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}
Pub Date : 1988-10-23DOI: 10.1109/MILCOM.1988.13406
Jack K. Wolf, R. D. Blakeney
The authors give a computationally efficient algorithm for computing the probability of undetected error for a class of cyclic codes whose generator polynomial is equal to (x+1) times a primitive irreducible polynomial. This class contains three CRC (cyclic redundancy check) codes that have been adopted as international standards. The algorithm was used to compute the performance of a number of codes at various shortened block lengths, often with surprising results. It is suggested that, when dealing with shortened block lengths, one should choose a primitive polynomial with many rather than few nonzero coefficients in order to produce a good code.<>
{"title":"An exact evaluation of the probability of undetected error for certain shortened binary CRC codes","authors":"Jack K. Wolf, R. D. Blakeney","doi":"10.1109/MILCOM.1988.13406","DOIUrl":"https://doi.org/10.1109/MILCOM.1988.13406","url":null,"abstract":"The authors give a computationally efficient algorithm for computing the probability of undetected error for a class of cyclic codes whose generator polynomial is equal to (x+1) times a primitive irreducible polynomial. This class contains three CRC (cyclic redundancy check) codes that have been adopted as international standards. The algorithm was used to compute the performance of a number of codes at various shortened block lengths, often with surprising results. It is suggested that, when dealing with shortened block lengths, one should choose a primitive polynomial with many rather than few nonzero coefficients in order to produce a good code.<<ETX>>","PeriodicalId":66166,"journal":{"name":"军事通信技术","volume":"32 1","pages":"287-292 vol.1"},"PeriodicalIF":0.0,"publicationDate":"1988-10-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84245757","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}
Pub Date : 1988-10-23DOI: 10.1109/MILCOM.1988.13361
P. Fetterolf, K. Ho, J.J. Shintani
Developments in image and signal processing have generated the need for a distribution system capable of transferring extremely large files while maintaining acceptable delays for real-time control packets. To fill this need, IMAGENET has been developed, a local area network (LAN) capable of transferring large data packets, as well as small real-time command messages, over a STAR-configured fiber-optic network. The authors describe the IMAGENET architecture, discuss its advantages over other LAN architectures, and utilize an M/G/1 priority queueing model to demonstrate its performance characteristics.<>
{"title":"IMAGENET: a high speed local area network","authors":"P. Fetterolf, K. Ho, J.J. Shintani","doi":"10.1109/MILCOM.1988.13361","DOIUrl":"https://doi.org/10.1109/MILCOM.1988.13361","url":null,"abstract":"Developments in image and signal processing have generated the need for a distribution system capable of transferring extremely large files while maintaining acceptable delays for real-time control packets. To fill this need, IMAGENET has been developed, a local area network (LAN) capable of transferring large data packets, as well as small real-time command messages, over a STAR-configured fiber-optic network. The authors describe the IMAGENET architecture, discuss its advantages over other LAN architectures, and utilize an M/G/1 priority queueing model to demonstrate its performance characteristics.<<ETX>>","PeriodicalId":66166,"journal":{"name":"军事通信技术","volume":"28 1","pages":"19-23 vol.1"},"PeriodicalIF":0.0,"publicationDate":"1988-10-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82322043","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}
Pub Date : 1988-10-23DOI: 10.1109/MILCOM.1988.13427
K. Kim, A. Polydoros
The authors report on a novel BPSK/QPSK classifier and compare it to the more traditional, ad-hoc techniques of-a-square-law classifier and phase-based classifiers (weighting on the phase histogram). The proposed classifier is derived by an approximation of the likelihood-ratio functionals of phase modulated digital signals in white Gaussian noise, called a quasi-log-likelihood-ratio (qLLR) rule. It is shown analytically that its performance is significantly better than that of intuitively designed phased-based rules or the conventional square-law classifier.<>
{"title":"Digital modulation classification: the BPSK versus QPSK case","authors":"K. Kim, A. Polydoros","doi":"10.1109/MILCOM.1988.13427","DOIUrl":"https://doi.org/10.1109/MILCOM.1988.13427","url":null,"abstract":"The authors report on a novel BPSK/QPSK classifier and compare it to the more traditional, ad-hoc techniques of-a-square-law classifier and phase-based classifiers (weighting on the phase histogram). The proposed classifier is derived by an approximation of the likelihood-ratio functionals of phase modulated digital signals in white Gaussian noise, called a quasi-log-likelihood-ratio (qLLR) rule. It is shown analytically that its performance is significantly better than that of intuitively designed phased-based rules or the conventional square-law classifier.<<ETX>>","PeriodicalId":66166,"journal":{"name":"军事通信技术","volume":"23 1","pages":"431-436 vol.2"},"PeriodicalIF":0.0,"publicationDate":"1988-10-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83562469","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}
Pub Date : 1988-10-23DOI: 10.1109/MILCOM.1988.13491
C. Pennington
The author suggests a unified military approach to the development of AI (artificial intelligence) systems and the resolution of AI-related issues by using one or more information-sharing techniques. Coordination within the military can result in several advantages, such as reducing duplication of effort, making research results easily available to help further other research efforts, providing a forum for discussion and resolution of issues, reducing duplication of costly mistakes, sharing resolutions of AI system security breaches, and providing a framework for a more formal standardization entity when one is needed. To realize these advantages, several techniques including relying on private industry resources, forming panels for discussion, publishing a newsletter devoted to AI systems and issues, establishing an online database of AI systems information, and creating a multicommand committee are proposed. Criteria are developed with which to evaluate and compare the techniques.<>
{"title":"A unified military approach to artificial intelligence","authors":"C. Pennington","doi":"10.1109/MILCOM.1988.13491","DOIUrl":"https://doi.org/10.1109/MILCOM.1988.13491","url":null,"abstract":"The author suggests a unified military approach to the development of AI (artificial intelligence) systems and the resolution of AI-related issues by using one or more information-sharing techniques. Coordination within the military can result in several advantages, such as reducing duplication of effort, making research results easily available to help further other research efforts, providing a forum for discussion and resolution of issues, reducing duplication of costly mistakes, sharing resolutions of AI system security breaches, and providing a framework for a more formal standardization entity when one is needed. To realize these advantages, several techniques including relying on private industry resources, forming panels for discussion, publishing a newsletter devoted to AI systems and issues, establishing an online database of AI systems information, and creating a multicommand committee are proposed. Criteria are developed with which to evaluate and compare the techniques.<<ETX>>","PeriodicalId":66166,"journal":{"name":"军事通信技术","volume":"3 1","pages":"859-863 vol.3"},"PeriodicalIF":0.0,"publicationDate":"1988-10-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89259797","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}
Pub Date : 1988-10-23DOI: 10.1109/MILCOM.1988.13505
M. Sust
Preamble processing combined with an adaptive sampling window technique and selection of the largest value of a certain number of matched-filter output samples is proposed as a data decision strategy for direct-sequence spread-spectrum receivers using digital correlators for baseband matched filtering. The preamble sequence provides exact knowledge of the occurrence of the correlation maximum. System performance is analyzed on the basis of a combinatorial model for the deviation of the signal statistics at the matched filter outputs and a Markov model for the dynamic behavior of the sampling window during reception of a burst. Theoretical system analysis is compared with measurements of the bit-error probability as a function of the receiver input signal/noise ratio.<>
{"title":"Performance of digital matched filters in a direct sequence spread spectrum receiver","authors":"M. Sust","doi":"10.1109/MILCOM.1988.13505","DOIUrl":"https://doi.org/10.1109/MILCOM.1988.13505","url":null,"abstract":"Preamble processing combined with an adaptive sampling window technique and selection of the largest value of a certain number of matched-filter output samples is proposed as a data decision strategy for direct-sequence spread-spectrum receivers using digital correlators for baseband matched filtering. The preamble sequence provides exact knowledge of the occurrence of the correlation maximum. System performance is analyzed on the basis of a combinatorial model for the deviation of the signal statistics at the matched filter outputs and a Markov model for the dynamic behavior of the sampling window during reception of a burst. Theoretical system analysis is compared with measurements of the bit-error probability as a function of the receiver input signal/noise ratio.<<ETX>>","PeriodicalId":66166,"journal":{"name":"军事通信技术","volume":"31 1","pages":"961-967 vol.3"},"PeriodicalIF":0.0,"publicationDate":"1988-10-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89074376","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}
Pub Date : 1988-10-23DOI: 10.1109/MILCOM.1988.13514
J. Broderick, R. Bruno, A. Weinberg
A Monte Carlo service availability simulation (SAS) model has been developed as a tool to support the architecture evaluation process for NASA's Advanced Tracking and Data Relay Satellite System (ATDRSS). The key component of the simulation is the spacecraft (S/C) reliability model which utilizes data on S/C subsystems for component configuration, reliability, and redundancy for the faithful generation of random S/C failures. The SAS logic responds to these failures to simulate the appropriate NASA responses for the launch and deployment of new S/C. The outputs of the simulation include the probability that the system meets projected communications requirements over time, required space-ground link capacity, statistics of future S/C launch dates, and number of S/C required over the system life cycle. The SAS is capable of modeling a broad set of system architectures and S/C configurations. Sample applications are described.<>
{"title":"A service availability simulation for the ATDRSS space segment","authors":"J. Broderick, R. Bruno, A. Weinberg","doi":"10.1109/MILCOM.1988.13514","DOIUrl":"https://doi.org/10.1109/MILCOM.1988.13514","url":null,"abstract":"A Monte Carlo service availability simulation (SAS) model has been developed as a tool to support the architecture evaluation process for NASA's Advanced Tracking and Data Relay Satellite System (ATDRSS). The key component of the simulation is the spacecraft (S/C) reliability model which utilizes data on S/C subsystems for component configuration, reliability, and redundancy for the faithful generation of random S/C failures. The SAS logic responds to these failures to simulate the appropriate NASA responses for the launch and deployment of new S/C. The outputs of the simulation include the probability that the system meets projected communications requirements over time, required space-ground link capacity, statistics of future S/C launch dates, and number of S/C required over the system life cycle. The SAS is capable of modeling a broad set of system architectures and S/C configurations. Sample applications are described.<<ETX>>","PeriodicalId":66166,"journal":{"name":"军事通信技术","volume":"27 1","pages":"1021-1025 vol.3"},"PeriodicalIF":0.0,"publicationDate":"1988-10-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83506610","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}
Pub Date : 1988-10-23DOI: 10.1109/MILCOM.1988.13375
S. Goldberg, R. Iltis
The authors propose an equalizer structure that combines the properties of both a standard decision-directed equalizer based on a minimum mean-squared error criterion and the '2-1' version constant modulus algorithm (CMA) equalizer. Analytical bit error rate results are presented for a BPSK direct-sequence spread-spectrum system that uses a finite-impulse-response adaptive equalizer based on such a scheme. Severe Frequency-selective distortion and inband tone interference are used as impairments. Preliminary results show 1-3 dB of improvement at low chip energy-to-noise ratios when using a combined CMA and recursive least-squares (RLS) cost function over the decision-directed RLS alone.<>
作者提出了一种均衡器结构，它结合了基于最小均方误差准则的标准决策导向均衡器和“2-1”版常模算法(CMA)均衡器的特性。给出了基于该方案的有限脉冲响应自适应均衡器的BPSK直接序列扩频系统误码率分析结果。严重的频率选择性失真和带内音干扰被用作损伤。初步结果表明，在低芯片能量噪声比下，使用CMA和递归最小二乘(RLS)成本函数的组合比单独使用决策导向最小二乘(RLS)成本函数的性能提高了1-3 dB
{"title":"Joint channel equalization and interference rejection using a modified constant modulus algorithm","authors":"S. Goldberg, R. Iltis","doi":"10.1109/MILCOM.1988.13375","DOIUrl":"https://doi.org/10.1109/MILCOM.1988.13375","url":null,"abstract":"The authors propose an equalizer structure that combines the properties of both a standard decision-directed equalizer based on a minimum mean-squared error criterion and the '2-1' version constant modulus algorithm (CMA) equalizer. Analytical bit error rate results are presented for a BPSK direct-sequence spread-spectrum system that uses a finite-impulse-response adaptive equalizer based on such a scheme. Severe Frequency-selective distortion and inband tone interference are used as impairments. Preliminary results show 1-3 dB of improvement at low chip energy-to-noise ratios when using a combined CMA and recursive least-squares (RLS) cost function over the decision-directed RLS alone.<<ETX>>","PeriodicalId":66166,"journal":{"name":"军事通信技术","volume":"70 1","pages":"97-101 vol.1"},"PeriodicalIF":0.0,"publicationDate":"1988-10-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79439127","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}
Pub Date : 1988-10-23DOI: 10.1109/MILCOM.1988.13477
F. Antonio, K. Gilhousen, I. Jacobs, L. A. Weaver
The technical characteristics of the OmniTRACS system are described. This system is the first operational mobile Ku-band satellite communications system and provides two-way message and position determination service to mobile terminals using existing Ku-band satellites. Interference to and from the system is minimized by the use of spread-spectrum techniques, together with low-power, low-data-rate transmissions. The applicability of this technology to implement a military mobile terminal operating over existing SHF satellites is also presented. Features discussed include the return- and forward-link modulating signals, the return-link power density, and the mobile-terminal hardware.<>
{"title":"OmniTRACS: a commercial Ku-band mobile satellite terminal and its applicability to military mobile terminals","authors":"F. Antonio, K. Gilhousen, I. Jacobs, L. A. Weaver","doi":"10.1109/MILCOM.1988.13477","DOIUrl":"https://doi.org/10.1109/MILCOM.1988.13477","url":null,"abstract":"The technical characteristics of the OmniTRACS system are described. This system is the first operational mobile Ku-band satellite communications system and provides two-way message and position determination service to mobile terminals using existing Ku-band satellites. Interference to and from the system is minimized by the use of spread-spectrum techniques, together with low-power, low-data-rate transmissions. The applicability of this technology to implement a military mobile terminal operating over existing SHF satellites is also presented. Features discussed include the return- and forward-link modulating signals, the return-link power density, and the mobile-terminal hardware.<<ETX>>","PeriodicalId":66166,"journal":{"name":"军事通信技术","volume":"86 1","pages":"761-764 vol.3"},"PeriodicalIF":0.0,"publicationDate":"1988-10-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75828649","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}
Pub Date : 1988-10-23DOI: 10.1109/MILCOM.1988.13382
M. Chase, K. Pahlavan
Indoor wireless communications (IWC) is an attractive alternative to wire-based local area networks. However, the indoor environment is characterized by fading multipath channels. Direct-sequence spread-spectrum techniques, with their inherent resistance to multipaths, are promising for IWC. To allow multiple users within a limited bandwidth, code division multiple access (CDMA) is needed. The authors analyze one relevant CDMA technique. A set of M-orthogonal sequences of length N is assigned to each of K users. The sequences consist of phase-modulated signals on the same carrier frequency. The bandwidth efficiency achieved over fading multipath channels is the presence of additive white Gaussian noise and multiple-access interference is determined.<>
{"title":"Spread spectrum multiple access performance of orthogonal codes in fading multipath channels","authors":"M. Chase, K. Pahlavan","doi":"10.1109/MILCOM.1988.13382","DOIUrl":"https://doi.org/10.1109/MILCOM.1988.13382","url":null,"abstract":"Indoor wireless communications (IWC) is an attractive alternative to wire-based local area networks. However, the indoor environment is characterized by fading multipath channels. Direct-sequence spread-spectrum techniques, with their inherent resistance to multipaths, are promising for IWC. To allow multiple users within a limited bandwidth, code division multiple access (CDMA) is needed. The authors analyze one relevant CDMA technique. A set of M-orthogonal sequences of length N is assigned to each of K users. The sequences consist of phase-modulated signals on the same carrier frequency. The bandwidth efficiency achieved over fading multipath channels is the presence of additive white Gaussian noise and multiple-access interference is determined.<<ETX>>","PeriodicalId":66166,"journal":{"name":"军事通信技术","volume":"31 1","pages":"143-147 vol.1"},"PeriodicalIF":0.0,"publicationDate":"1988-10-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76148211","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}
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