Pub Date : 1992-10-11DOI: 10.1109/MILCOM.1992.244059
F. Halloran, J. Bass, A. Senesey, P. Sass, L. Bergman
The Army Tactical Command and Control System (ATCCS) local area network (LAN) is currently based on a commercial Ethernet data interface independent of circuit switched voice subscriber circuits. An evolution which will utilize a mixture of fiber optic wireless LAN technologies and existing US Army communication assets to support data users, followed by complete integration of all services in the local area, is anticipated. The authors describe how the proposed evolution to fiber optic networks in the ATCCS LAN architecture can be accomplished and how the army's Advanced Technology Demonstration Program (ATD) can be utilized to ensure that fiber optic networks will be compatible with existing military communicates. A proposed application of the current Fiber Distributed Data Interface (FDDI) standard to support real-time voice and video services, in addition to data, in a format compatible with the army's evolving ATCCS LAN architecture, is discussed.<>
{"title":"Fiber optic local area networks-a part of the future ATCCS architecture","authors":"F. Halloran, J. Bass, A. Senesey, P. Sass, L. Bergman","doi":"10.1109/MILCOM.1992.244059","DOIUrl":"https://doi.org/10.1109/MILCOM.1992.244059","url":null,"abstract":"The Army Tactical Command and Control System (ATCCS) local area network (LAN) is currently based on a commercial Ethernet data interface independent of circuit switched voice subscriber circuits. An evolution which will utilize a mixture of fiber optic wireless LAN technologies and existing US Army communication assets to support data users, followed by complete integration of all services in the local area, is anticipated. The authors describe how the proposed evolution to fiber optic networks in the ATCCS LAN architecture can be accomplished and how the army's Advanced Technology Demonstration Program (ATD) can be utilized to ensure that fiber optic networks will be compatible with existing military communicates. A proposed application of the current Fiber Distributed Data Interface (FDDI) standard to support real-time voice and video services, in addition to data, in a format compatible with the army's evolving ATCCS LAN architecture, is discussed.<<ETX>>","PeriodicalId":394587,"journal":{"name":"MILCOM 92 Conference Record","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1992-10-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134088113","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 : 1992-10-11DOI: 10.1109/MILCOM.1992.244118
M. Darnell, B. Honary, P. Clark, N. Horley, M. Maundrell, G. Vongas
An adaptive digital-signal-processing (DSP)-based MFSK modem using the PICCOLO modulation scheme has been developed, primarily as a research platform for the investigation of adaptive HF radio modems. The authors describe several important design features of the implementation, including a novel data-derived synchronization scheme. The modem exhibits a far greater degree of responsiveness to both user requirements and channel state than previous implementations. Of particular interest are the efficient memory shadowing technique used in the tone synthesis, the ability to vary the number of samples/symbol, the frequency offset correction method, and the modulation-derived synchronization (MDS) embedded synchronization technique which eliminates the need for any specific synchronization overheads. The use of the model in a semiorthogonal MFSK mode is also discussed.<>
{"title":"Adaptive DSP-based MFSK modems for HF aeromobile channels","authors":"M. Darnell, B. Honary, P. Clark, N. Horley, M. Maundrell, G. Vongas","doi":"10.1109/MILCOM.1992.244118","DOIUrl":"https://doi.org/10.1109/MILCOM.1992.244118","url":null,"abstract":"An adaptive digital-signal-processing (DSP)-based MFSK modem using the PICCOLO modulation scheme has been developed, primarily as a research platform for the investigation of adaptive HF radio modems. The authors describe several important design features of the implementation, including a novel data-derived synchronization scheme. The modem exhibits a far greater degree of responsiveness to both user requirements and channel state than previous implementations. Of particular interest are the efficient memory shadowing technique used in the tone synthesis, the ability to vary the number of samples/symbol, the frequency offset correction method, and the modulation-derived synchronization (MDS) embedded synchronization technique which eliminates the need for any specific synchronization overheads. The use of the model in a semiorthogonal MFSK mode is also discussed.<<ETX>>","PeriodicalId":394587,"journal":{"name":"MILCOM 92 Conference Record","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1992-10-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134266275","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 : 1992-10-11DOI: 10.1109/MILCOM.1992.244001
T. D. Papavassiliou, A. Polydoros, J. Silvester
The authors investigate the multiple-access capability of spatially distributed packet radio networks which employ frequency-hopping spread-spectrum signaling, random hopping patterns, and Reed-Solomon (RS) coding with errors-and-erasures decoding via the radio-threshold test. In addition to multiple access interference, thermal noise is present in the channel. Using Laguerre-series expansions for the statistics of the envelope of a sum of randomly phased sinusoids in Gaussian noise, analytic expressions for the probabilities of symbol events are obtained. These expressions can be accurately and rapidly evaluated compared to direct numerical integration. The general setup is applicable to the important case of varying and random amplitudes, which is related to the near-far problem in terrestrial radio networks.<>
{"title":"Packet error probabilities for FHMA radio networks with radio-threshold test and unequal, power levels","authors":"T. D. Papavassiliou, A. Polydoros, J. Silvester","doi":"10.1109/MILCOM.1992.244001","DOIUrl":"https://doi.org/10.1109/MILCOM.1992.244001","url":null,"abstract":"The authors investigate the multiple-access capability of spatially distributed packet radio networks which employ frequency-hopping spread-spectrum signaling, random hopping patterns, and Reed-Solomon (RS) coding with errors-and-erasures decoding via the radio-threshold test. In addition to multiple access interference, thermal noise is present in the channel. Using Laguerre-series expansions for the statistics of the envelope of a sum of randomly phased sinusoids in Gaussian noise, analytic expressions for the probabilities of symbol events are obtained. These expressions can be accurately and rapidly evaluated compared to direct numerical integration. The general setup is applicable to the important case of varying and random amplitudes, which is related to the near-far problem in terrestrial radio networks.<<ETX>>","PeriodicalId":394587,"journal":{"name":"MILCOM 92 Conference Record","volume":"322 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1992-10-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134484261","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 : 1992-10-11DOI: 10.1109/MILCOM.1992.243971
S. R. Muthangi, S. Muralidhara, H. Shivashankar
A simulation model is developed to study the performance of SAFENET (Survivable Adaptive Fiber-Optic Embedded Network) II with varying values of target token rotation time (TTRT). The selection of an optimized TTRT for a particular mission is of paramount importance in the operation of SAFENET II. The performance of the ring was analyzed when the stations were allocated synchronous bandwidth to match their requirement and further fine-tuned to achieve real-time performance. The suggested mechanism over SAFENET can successfully deliver real-time synchronous packets within strict delay constraints.<>
{"title":"Performance analysis of SAFENET II with an optimized TTRT","authors":"S. R. Muthangi, S. Muralidhara, H. Shivashankar","doi":"10.1109/MILCOM.1992.243971","DOIUrl":"https://doi.org/10.1109/MILCOM.1992.243971","url":null,"abstract":"A simulation model is developed to study the performance of SAFENET (Survivable Adaptive Fiber-Optic Embedded Network) II with varying values of target token rotation time (TTRT). The selection of an optimized TTRT for a particular mission is of paramount importance in the operation of SAFENET II. The performance of the ring was analyzed when the stations were allocated synchronous bandwidth to match their requirement and further fine-tuned to achieve real-time performance. The suggested mechanism over SAFENET can successfully deliver real-time synchronous packets within strict delay constraints.<<ETX>>","PeriodicalId":394587,"journal":{"name":"MILCOM 92 Conference Record","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1992-10-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132104498","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 : 1992-10-11DOI: 10.1109/MILCOM.1992.244145
A. Brigante, G. Guidotti
The concept of the SOTRIN SCRA (single-channel radio access), the mobile radio extension of the SOTRIN Area Communication System that is fully compliant with EUROCOM specifications, is described. IT provides full duplex VHF radio communications to mobile users, with TRANSEC and COMSEC protection, offering the same numbering scheme and services as for the static subscribers. The SCRA can also work in stand-alone mode as an autonomous communication center ideal for quickly deploying troops operating far from the rear combat zone. The system shows good performance in terms of probability of connection even in the worst electromagnetic scenario and high traffic density. The most advanced technical solutions regarding hybrid DS/FH (direct sequence/frequency hopping) ECCM (electronic counter countermeasures) modulation and antenna coupling for the eight transceivers at the radio access point are discussed.<>
{"title":"The mobile radio extension of the SOTRIN Area Communication System","authors":"A. Brigante, G. Guidotti","doi":"10.1109/MILCOM.1992.244145","DOIUrl":"https://doi.org/10.1109/MILCOM.1992.244145","url":null,"abstract":"The concept of the SOTRIN SCRA (single-channel radio access), the mobile radio extension of the SOTRIN Area Communication System that is fully compliant with EUROCOM specifications, is described. IT provides full duplex VHF radio communications to mobile users, with TRANSEC and COMSEC protection, offering the same numbering scheme and services as for the static subscribers. The SCRA can also work in stand-alone mode as an autonomous communication center ideal for quickly deploying troops operating far from the rear combat zone. The system shows good performance in terms of probability of connection even in the worst electromagnetic scenario and high traffic density. The most advanced technical solutions regarding hybrid DS/FH (direct sequence/frequency hopping) ECCM (electronic counter countermeasures) modulation and antenna coupling for the eight transceivers at the radio access point are discussed.<<ETX>>","PeriodicalId":394587,"journal":{"name":"MILCOM 92 Conference Record","volume":"46 9","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1992-10-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132390324","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 : 1992-10-11DOI: 10.1109/MILCOM.1992.244175
Maureen Hugo, A. Rubin
It is noted that personal communication services (PCS) may be able to serve as valuable wireless systems that integrate with existing National Communications System programs in support of the federal government. The authors consider the overall characteristics and possible implementations of PCS. It is pointed out that PCS has potential to provide significant benefits to national security and emergency preparedness users, including mobile capability, access to and egress from the public switched network, the ability to receive calls based on a user identification number, authorized access to presubscribed services, and wireless private branch exchange capability.<>
{"title":"Personal communication networks: their application to NS/EP telecommunications","authors":"Maureen Hugo, A. Rubin","doi":"10.1109/MILCOM.1992.244175","DOIUrl":"https://doi.org/10.1109/MILCOM.1992.244175","url":null,"abstract":"It is noted that personal communication services (PCS) may be able to serve as valuable wireless systems that integrate with existing National Communications System programs in support of the federal government. The authors consider the overall characteristics and possible implementations of PCS. It is pointed out that PCS has potential to provide significant benefits to national security and emergency preparedness users, including mobile capability, access to and egress from the public switched network, the ability to receive calls based on a user identification number, authorized access to presubscribed services, and wireless private branch exchange capability.<<ETX>>","PeriodicalId":394587,"journal":{"name":"MILCOM 92 Conference Record","volume":"73 8","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1992-10-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133007076","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 : 1992-10-11DOI: 10.1109/MILCOM.1992.243969
J. E. Baker, L. Clare, J. Agre, W. Heyman
The authors investigate the use of a command, control, and communications workstation (C3WS) to automate the processing and display of incoming messages, status information, and outgoing orders. A protocol has been developed for the scheduling of incoming messages which, by considering their relative importance and criticality, displays them for processing by the commander. Improved decision-making is achieved by presenting the list of pending (unread) messages to the commander in an optimal order, thereby reducing decision cycle times. This aspect is referred to as value-based scheduling of information. To test the concept of value-based message scheduling, a software prototype of a C/sup 3/ workstation has been developed. The functional components of the C3WS software are described, and test trials that have been made are discussed.<>
{"title":"A value-based protocol for message scheduling in a C/sup 3/ workstation","authors":"J. E. Baker, L. Clare, J. Agre, W. Heyman","doi":"10.1109/MILCOM.1992.243969","DOIUrl":"https://doi.org/10.1109/MILCOM.1992.243969","url":null,"abstract":"The authors investigate the use of a command, control, and communications workstation (C3WS) to automate the processing and display of incoming messages, status information, and outgoing orders. A protocol has been developed for the scheduling of incoming messages which, by considering their relative importance and criticality, displays them for processing by the commander. Improved decision-making is achieved by presenting the list of pending (unread) messages to the commander in an optimal order, thereby reducing decision cycle times. This aspect is referred to as value-based scheduling of information. To test the concept of value-based message scheduling, a software prototype of a C/sup 3/ workstation has been developed. The functional components of the C3WS software are described, and test trials that have been made are discussed.<<ETX>>","PeriodicalId":394587,"journal":{"name":"MILCOM 92 Conference Record","volume":" 41","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1992-10-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120935417","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 : 1992-10-11DOI: 10.1109/MILCOM.1992.243993
M. J. Sousa
Conventional analyses of the crosscorrelation radiometer are based on an ideal assumption of a perfectly correlated signal, and Gaussian noise that is uncorrelated between the sensors. In the present work, the author predicts crosscorrelation radiometer performance under less ideal assumptions: non-Gaussian noise, nonzero noise correlation, and imperfect signal correlation. Using a noise model that accounts for uncertainty in the noise and signal parameters, he shows that the crosscorrelation radiometer is sensitive to uncertainty in the noise correlation coefficient. Moreover, even if the noise correlation coefficient is known exactly, detection performance degrade when there is uncertainty in the noise power.<>
{"title":"Limitations of crosscorrelation radiometer performance","authors":"M. J. Sousa","doi":"10.1109/MILCOM.1992.243993","DOIUrl":"https://doi.org/10.1109/MILCOM.1992.243993","url":null,"abstract":"Conventional analyses of the crosscorrelation radiometer are based on an ideal assumption of a perfectly correlated signal, and Gaussian noise that is uncorrelated between the sensors. In the present work, the author predicts crosscorrelation radiometer performance under less ideal assumptions: non-Gaussian noise, nonzero noise correlation, and imperfect signal correlation. Using a noise model that accounts for uncertainty in the noise and signal parameters, he shows that the crosscorrelation radiometer is sensitive to uncertainty in the noise correlation coefficient. Moreover, even if the noise correlation coefficient is known exactly, detection performance degrade when there is uncertainty in the noise power.<<ETX>>","PeriodicalId":394587,"journal":{"name":"MILCOM 92 Conference Record","volume":"41 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1992-10-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114848846","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 : 1992-10-11DOI: 10.1109/MILCOM.1992.243982
R. Doyle, A. Sastry
The authors have developed a knowledge-based model of network management and applied it to multihop packet radio networks for fault diagnosis and transmission control. The model has two distinctive features: (1) a distributed control concept and (2) the use of the blackboard paradigm as a knowledge-based environment. The focus of the effort has been on diagnosing faults and other abnormal conditions and applying corrective actions. For transmission control, the authors have implemented a control policy based on observed channel occupancy. At the transport level, the messages are segmented/reassembled, and a facility has been created to allow nonuniform traffic among different source-destination pairs. The authors present a brief description of the software testbed consisting of a packet radio network simulation and the blackboard environment, describe the control rules that have been implemented, and summarize the results obtained.<>
{"title":"Knowledge-based management of multi-hop packet radio networks","authors":"R. Doyle, A. Sastry","doi":"10.1109/MILCOM.1992.243982","DOIUrl":"https://doi.org/10.1109/MILCOM.1992.243982","url":null,"abstract":"The authors have developed a knowledge-based model of network management and applied it to multihop packet radio networks for fault diagnosis and transmission control. The model has two distinctive features: (1) a distributed control concept and (2) the use of the blackboard paradigm as a knowledge-based environment. The focus of the effort has been on diagnosing faults and other abnormal conditions and applying corrective actions. For transmission control, the authors have implemented a control policy based on observed channel occupancy. At the transport level, the messages are segmented/reassembled, and a facility has been created to allow nonuniform traffic among different source-destination pairs. The authors present a brief description of the software testbed consisting of a packet radio network simulation and the blackboard environment, describe the control rules that have been implemented, and summarize the results obtained.<<ETX>>","PeriodicalId":394587,"journal":{"name":"MILCOM 92 Conference Record","volume":"20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1992-10-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114977380","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 : 1992-10-11DOI: 10.1109/MILCOM.1992.244042
Vladan M. Jovanovic, E. Sousa
Noncoherent detectors for initial code synchronization (acquisition) of binary- and quarternary-phase-shift-keying (BPSK and QPSK) direct-sequence (DS) spread-spectrum signals are analyzed. In addition to the thermal noise, in many applications such detectors are faced with self-noise due to imperfect correlations. Assuming random spreading code sequences, it is shown that the Gaussian approximation to the code partial autocorrelation distribution is very well justified. Based on the theory of circularly symmetric random variables, exact results for the detection performance of BPSK and QPSK schemes are obtained, and handy approximations are devised.<>
{"title":"Non-coherent detection for DS spread-spectrum acquisition","authors":"Vladan M. Jovanovic, E. Sousa","doi":"10.1109/MILCOM.1992.244042","DOIUrl":"https://doi.org/10.1109/MILCOM.1992.244042","url":null,"abstract":"Noncoherent detectors for initial code synchronization (acquisition) of binary- and quarternary-phase-shift-keying (BPSK and QPSK) direct-sequence (DS) spread-spectrum signals are analyzed. In addition to the thermal noise, in many applications such detectors are faced with self-noise due to imperfect correlations. Assuming random spreading code sequences, it is shown that the Gaussian approximation to the code partial autocorrelation distribution is very well justified. Based on the theory of circularly symmetric random variables, exact results for the detection performance of BPSK and QPSK schemes are obtained, and handy approximations are devised.<<ETX>>","PeriodicalId":394587,"journal":{"name":"MILCOM 92 Conference Record","volume":"64 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1992-10-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116165388","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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