Pub Date : 1994-10-02DOI: 10.1109/MILCOM.1994.473909
R. Hodge, M. Gordon
As network planners try to plan and operate networks that offer the best value for money, they often find it a difficult to choose among the many alternatives. Network modeling can yield insight into network performance and cost prior to investment. Network modeling is a decision support tool, only as good as the information it processes. Ultimately, a successful network manager understands current requirements and is prepared to meet requirements in the future. Modeling can perform essential services to keep a network manager better informed and prepared, and a business better poised to meet the demand of its users and ultimately the demands of its customers.<>
{"title":"Developing the \"model\" network","authors":"R. Hodge, M. Gordon","doi":"10.1109/MILCOM.1994.473909","DOIUrl":"https://doi.org/10.1109/MILCOM.1994.473909","url":null,"abstract":"As network planners try to plan and operate networks that offer the best value for money, they often find it a difficult to choose among the many alternatives. Network modeling can yield insight into network performance and cost prior to investment. Network modeling is a decision support tool, only as good as the information it processes. Ultimately, a successful network manager understands current requirements and is prepared to meet requirements in the future. Modeling can perform essential services to keep a network manager better informed and prepared, and a business better poised to meet the demand of its users and ultimately the demands of its customers.<<ETX>>","PeriodicalId":337873,"journal":{"name":"Proceedings of MILCOM '94","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1994-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126786026","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 : 1994-10-02DOI: 10.1109/MILCOM.1994.473875
D. Torrieri, K. Bakhru
Adaptive superresolution algorithms possess the inherent ability to adapt to nonstationary environments. In this paper, a representative adaptive algorithm, the recursive suppression algorithm, is shown to provide much better resolution than the MUSIC algorithm when the average signal-to-noise ratios at array outputs are low and there are power variations or there is relative motion between the array and closely spaced signal sources.<>
{"title":"Comparison of adaptive superresolution with MUSIC algorithm","authors":"D. Torrieri, K. Bakhru","doi":"10.1109/MILCOM.1994.473875","DOIUrl":"https://doi.org/10.1109/MILCOM.1994.473875","url":null,"abstract":"Adaptive superresolution algorithms possess the inherent ability to adapt to nonstationary environments. In this paper, a representative adaptive algorithm, the recursive suppression algorithm, is shown to provide much better resolution than the MUSIC algorithm when the average signal-to-noise ratios at array outputs are low and there are power variations or there is relative motion between the array and closely spaced signal sources.<<ETX>>","PeriodicalId":337873,"journal":{"name":"Proceedings of MILCOM '94","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1994-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126901821","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 : 1994-10-02DOI: 10.1109/MILCOM.1994.473928
Taehyun Kim, J. Yun, Sun Yong Kim, I. Song
In this paper we consider the discrete-time known signal detection problem under a weakly dependent noise model, and derive the locally optimum, memoryless, and one-memory detector test statistics under the model. The asymptotic performance of several detectors are investigated. We observe that the one-memory detector can achieve almost optimum performance at the expense of only one memory unit under the weakly dependent noise model.<>
{"title":"Asymptotic performance comparison of known signal detection schemes in weakly dependent noise","authors":"Taehyun Kim, J. Yun, Sun Yong Kim, I. Song","doi":"10.1109/MILCOM.1994.473928","DOIUrl":"https://doi.org/10.1109/MILCOM.1994.473928","url":null,"abstract":"In this paper we consider the discrete-time known signal detection problem under a weakly dependent noise model, and derive the locally optimum, memoryless, and one-memory detector test statistics under the model. The asymptotic performance of several detectors are investigated. We observe that the one-memory detector can achieve almost optimum performance at the expense of only one memory unit under the weakly dependent noise model.<<ETX>>","PeriodicalId":337873,"journal":{"name":"Proceedings of MILCOM '94","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1994-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122175006","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 : 1994-10-02DOI: 10.1109/MILCOM.1994.474017
M. Boukli-Hacene, L. Kurz
A comparative study of the coherent optical binary phase shift keying (BPSK) and quadrature phase shift keying (QPSK) heterodyne communication receivers is presented. First, both receivers are analyzed assuming two systems with a 0.5 dB and 2.5 dB power penalty. The analysis is performed in terms of laser linewidth, bit rate signal power and phase error for the same bit error rate 10/sup -10/. The sensitivities of the two types of receivers are compared. Second, calculations of the signal to noise ratio (SNR) optimum, probability of bit error with cycle slippage and non-cycle slippage for both systems are presented. Finally, the comparison in terms of BER versus number of photons/bit (E/sub pb/) for different laser linewidth/bit rates and bit error rate 10/sup -3/ and 10/sup -1/ are presented. It is shown that the QPSK receiver requires a larger amount of power than the BPSK receiver to achieve the same performance. At the power penalty of 0.5 dB, the QPSK systems are impractical while the BPSK system performs well.<>
{"title":"Comparison of optical BPSK and QPSK heterodyne lightwave systems","authors":"M. Boukli-Hacene, L. Kurz","doi":"10.1109/MILCOM.1994.474017","DOIUrl":"https://doi.org/10.1109/MILCOM.1994.474017","url":null,"abstract":"A comparative study of the coherent optical binary phase shift keying (BPSK) and quadrature phase shift keying (QPSK) heterodyne communication receivers is presented. First, both receivers are analyzed assuming two systems with a 0.5 dB and 2.5 dB power penalty. The analysis is performed in terms of laser linewidth, bit rate signal power and phase error for the same bit error rate 10/sup -10/. The sensitivities of the two types of receivers are compared. Second, calculations of the signal to noise ratio (SNR) optimum, probability of bit error with cycle slippage and non-cycle slippage for both systems are presented. Finally, the comparison in terms of BER versus number of photons/bit (E/sub pb/) for different laser linewidth/bit rates and bit error rate 10/sup -3/ and 10/sup -1/ are presented. It is shown that the QPSK receiver requires a larger amount of power than the BPSK receiver to achieve the same performance. At the power penalty of 0.5 dB, the QPSK systems are impractical while the BPSK system performs well.<<ETX>>","PeriodicalId":337873,"journal":{"name":"Proceedings of MILCOM '94","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1994-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122175083","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 : 1994-10-02DOI: 10.1109/MILCOM.1994.473828
J. Deville, C. King
In fiscal year 1994, the Deputy Commander in Chief of the United States Commander in Chief Pacific (USCINCPAC) expressed a concern about the lack of interoperability of the multiple video teleconferencing (VTC) systems that have been installed to support the United States Pacific Command (USPACOM). In response to this concern, two quick-reaction studies of the existing USPACOM VTC systems were conducted and provided to the USCINCPAC J6 who is responsible for making recommendations for interconnecting USPACOM sites by VTC. The paper examines the issues of VTC systems interoperability and in specific examines the lack of standardized VTC transmission rates, multiple transmission networks, and the lack of commonality or standardization of video coder/decoders (codecs) and other supporting VTC equipment. Also discussed are alternative methods of interconnecting the existing USPACOM VTC systems, emerging international, U.S. Government, and Department of Defense (DOD) VTC standards, and the proposed migration to a standards-based VTC architecture. Of additional interest is the design of a multipoint control unit (MCU) meeting international standards that has been tested in both the United States and Europe. Certain conclusions and recommendations are provided. More importantly, while the systems examined are specific to USPACOM, the underlying issues concerning interoperability of existing VTC systems and the alternative methods of interconnection are common to and apply across the DOD community.<>
{"title":"Interoperability issues of existing collateral video teleconferencing systems at the United States Pacific Command","authors":"J. Deville, C. King","doi":"10.1109/MILCOM.1994.473828","DOIUrl":"https://doi.org/10.1109/MILCOM.1994.473828","url":null,"abstract":"In fiscal year 1994, the Deputy Commander in Chief of the United States Commander in Chief Pacific (USCINCPAC) expressed a concern about the lack of interoperability of the multiple video teleconferencing (VTC) systems that have been installed to support the United States Pacific Command (USPACOM). In response to this concern, two quick-reaction studies of the existing USPACOM VTC systems were conducted and provided to the USCINCPAC J6 who is responsible for making recommendations for interconnecting USPACOM sites by VTC. The paper examines the issues of VTC systems interoperability and in specific examines the lack of standardized VTC transmission rates, multiple transmission networks, and the lack of commonality or standardization of video coder/decoders (codecs) and other supporting VTC equipment. Also discussed are alternative methods of interconnecting the existing USPACOM VTC systems, emerging international, U.S. Government, and Department of Defense (DOD) VTC standards, and the proposed migration to a standards-based VTC architecture. Of additional interest is the design of a multipoint control unit (MCU) meeting international standards that has been tested in both the United States and Europe. Certain conclusions and recommendations are provided. More importantly, while the systems examined are specific to USPACOM, the underlying issues concerning interoperability of existing VTC systems and the alternative methods of interconnection are common to and apply across the DOD community.<<ETX>>","PeriodicalId":337873,"journal":{"name":"Proceedings of MILCOM '94","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1994-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120925124","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 : 1994-10-02DOI: 10.1109/MILCOM.1994.473883
R.I. Desourdis, A.K. McDonough, S.C. Merrill, R.M. Bauman, D.A. Neumann, J.A. Lucas, D. Spector, D.E. Warren
The Advanced Research Projects Agency (ARPA) has established the Advanced Meteor-Burst Test Bed (AMBTB) between NISE EAST in Charleston, South Carolina, and Rome Laboratory facilities in Verona, New York. This link has been used to demonstrate multi-media communications, including transmission of text and digitized voice messages. In addition, the AMBTB has been configured for mobile platform tracking using GPS-derived position-location messages and ARPA-sponsored roadmap display software. This paper describes the tracking portion of the AMBTB demonstration and presents preliminary results from a mobile tracking test performed in October 1993.<>
{"title":"GPS-based vehicle tracking with meteor-burst telemetry","authors":"R.I. Desourdis, A.K. McDonough, S.C. Merrill, R.M. Bauman, D.A. Neumann, J.A. Lucas, D. Spector, D.E. Warren","doi":"10.1109/MILCOM.1994.473883","DOIUrl":"https://doi.org/10.1109/MILCOM.1994.473883","url":null,"abstract":"The Advanced Research Projects Agency (ARPA) has established the Advanced Meteor-Burst Test Bed (AMBTB) between NISE EAST in Charleston, South Carolina, and Rome Laboratory facilities in Verona, New York. This link has been used to demonstrate multi-media communications, including transmission of text and digitized voice messages. In addition, the AMBTB has been configured for mobile platform tracking using GPS-derived position-location messages and ARPA-sponsored roadmap display software. This paper describes the tracking portion of the AMBTB demonstration and presents preliminary results from a mobile tracking test performed in October 1993.<<ETX>>","PeriodicalId":337873,"journal":{"name":"Proceedings of MILCOM '94","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1994-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121734892","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 : 1994-10-02DOI: 10.1109/MILCOM.1994.473971
Dongin Kim
A spread-spectrum multiple-access (SSMA) scheme that utilizes a group coding technique using a subset of signature sequences, in which the size of the subset is considerably less than the number of radios in the system, is proposed for packet radio communications. A direct-sequence spread-spectrum (DS-SS) signaling is adopted to combat fading effects through the multipath diversity reception exploiting the property of high time resolution. System performance is investigated in terms of the error rate achievable by deriving the probability distribution of the number of collision-free paths and characterizing the effects of the primary and secondary user interferences.<>
{"title":"Performance of DS/SSMA packet radio system using group coding technique","authors":"Dongin Kim","doi":"10.1109/MILCOM.1994.473971","DOIUrl":"https://doi.org/10.1109/MILCOM.1994.473971","url":null,"abstract":"A spread-spectrum multiple-access (SSMA) scheme that utilizes a group coding technique using a subset of signature sequences, in which the size of the subset is considerably less than the number of radios in the system, is proposed for packet radio communications. A direct-sequence spread-spectrum (DS-SS) signaling is adopted to combat fading effects through the multipath diversity reception exploiting the property of high time resolution. System performance is investigated in terms of the error rate achievable by deriving the probability distribution of the number of collision-free paths and characterizing the effects of the primary and secondary user interferences.<<ETX>>","PeriodicalId":337873,"journal":{"name":"Proceedings of MILCOM '94","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1994-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122727747","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 : 1994-10-02DOI: 10.1109/MILCOM.1994.473982
D. Divsalar, M. Simon
The paper considers a general parallel interference cancellation scheme that significantly reduces the degradation effect of user interference but with a lesser implementation complexity than the maximum-likelihood technique. The scheme operates on the fact that parallel processing simultaneously removes from each user the total interference produced by the remaining most reliably received users accessing the channel. The parallel processing can be done in multiple stages. The proposed scheme uses tentative decision devices with different optimum thresholds at the multiple stages to produce the most reliably received data for generation and cancellation of user interference. The 1-stage interference cancellation is analyzed for three types of tentative decision devices, namely hard, null zone, and soft decision. Simulation results are given for 1- and 2-stage interference cancellation for equal as well as unequal power users.<>
{"title":"Improved CDMA performance using parallel interference cancellation","authors":"D. Divsalar, M. Simon","doi":"10.1109/MILCOM.1994.473982","DOIUrl":"https://doi.org/10.1109/MILCOM.1994.473982","url":null,"abstract":"The paper considers a general parallel interference cancellation scheme that significantly reduces the degradation effect of user interference but with a lesser implementation complexity than the maximum-likelihood technique. The scheme operates on the fact that parallel processing simultaneously removes from each user the total interference produced by the remaining most reliably received users accessing the channel. The parallel processing can be done in multiple stages. The proposed scheme uses tentative decision devices with different optimum thresholds at the multiple stages to produce the most reliably received data for generation and cancellation of user interference. The 1-stage interference cancellation is analyzed for three types of tentative decision devices, namely hard, null zone, and soft decision. Simulation results are given for 1- and 2-stage interference cancellation for equal as well as unequal power users.<<ETX>>","PeriodicalId":337873,"journal":{"name":"Proceedings of MILCOM '94","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1994-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132651060","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 : 1994-10-02DOI: 10.1109/MILCOM.1994.473973
Z. Feng, O. Yang
This paper studies routing algorithms of the multihop lightwave systems based on the bidirectional de Bruijn graph. Three different routing methods are proposed and performance results are obtained in terms of the mean path lengths, network throughput and delay performance. The study shows that the performance of this type of topology is desirable and comparable to other types of multihop systems. It may be considered as a candidate for metropolitan area networks.<>
{"title":"Routing algorithms in the bidirectional de Bruijn graph metropolitan area networks","authors":"Z. Feng, O. Yang","doi":"10.1109/MILCOM.1994.473973","DOIUrl":"https://doi.org/10.1109/MILCOM.1994.473973","url":null,"abstract":"This paper studies routing algorithms of the multihop lightwave systems based on the bidirectional de Bruijn graph. Three different routing methods are proposed and performance results are obtained in terms of the mean path lengths, network throughput and delay performance. The study shows that the performance of this type of topology is desirable and comparable to other types of multihop systems. It may be considered as a candidate for metropolitan area networks.<<ETX>>","PeriodicalId":337873,"journal":{"name":"Proceedings of MILCOM '94","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1994-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131877265","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 : 1994-10-02DOI: 10.1109/MILCOM.1994.473842
L. Tong
An adaptive blind equalisation and tracking technique is developed in this paper that provides robustness against frequency offset and the time-varying Doppler spread. Without requiring training signals, the proposed approach combines the blind sequence estimation method and an estimate-maximization (EM) approach for the adaptive joint estimation of information sequence and frequency offset. Using antenna arrays, the proposed scheme exploits important spatial diversity. It also has a structure that is attractive for adaptive implementation.<>
{"title":"Adaptive blind equalization and tracking of fading channels using antenna arrays","authors":"L. Tong","doi":"10.1109/MILCOM.1994.473842","DOIUrl":"https://doi.org/10.1109/MILCOM.1994.473842","url":null,"abstract":"An adaptive blind equalisation and tracking technique is developed in this paper that provides robustness against frequency offset and the time-varying Doppler spread. Without requiring training signals, the proposed approach combines the blind sequence estimation method and an estimate-maximization (EM) approach for the adaptive joint estimation of information sequence and frequency offset. Using antenna arrays, the proposed scheme exploits important spatial diversity. It also has a structure that is attractive for adaptive implementation.<<ETX>>","PeriodicalId":337873,"journal":{"name":"Proceedings of MILCOM '94","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1994-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114062276","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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