Pub Date : 1988-10-23DOI: 10.1109/MILCOM.1988.13516
S. An, W. Lindsey
The authors demonstrate an approach to evaluating the bit-error probability performance of a satellite communication system operating in the presence of scintillation and thermal noise. The probability distribution function of the decision variable is used in an analytical simulation to predict bit-error probabilities for various channel conditions. With regard to treating the problems due to channel memory, a software simulator of the system has been developed; this simulator accounts for the coding, modulation, channel memory, noise, scintillation statistics, and the interleaver-deinterleaver system design. A tradeoff analysis is made with regard to different approaches concerning signal processing in the satellite and ground station. Soft- vs. hard-decision Viterbi decoding in a ground receiver is evaluated. Results on signal processing in the satellite as compared to that in the ground station are provided.<>
{"title":"Satellite communication system performance in the presence of scintillation","authors":"S. An, W. Lindsey","doi":"10.1109/MILCOM.1988.13516","DOIUrl":"https://doi.org/10.1109/MILCOM.1988.13516","url":null,"abstract":"The authors demonstrate an approach to evaluating the bit-error probability performance of a satellite communication system operating in the presence of scintillation and thermal noise. The probability distribution function of the decision variable is used in an analytical simulation to predict bit-error probabilities for various channel conditions. With regard to treating the problems due to channel memory, a software simulator of the system has been developed; this simulator accounts for the coding, modulation, channel memory, noise, scintillation statistics, and the interleaver-deinterleaver system design. A tradeoff analysis is made with regard to different approaches concerning signal processing in the satellite and ground station. Soft- vs. hard-decision Viterbi decoding in a ground receiver is evaluated. Results on signal processing in the satellite as compared to that in the ground station are provided.<<ETX>>","PeriodicalId":66166,"journal":{"name":"军事通信技术","volume":"132 1","pages":"1035-1039 vol.3"},"PeriodicalIF":0.0,"publicationDate":"1988-10-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85753794","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.1988.13358
M. Pugh
The design of high-speed optical data links involves a number of factors on which engineering tradeoffs must be made. The author discusses these tradeoffs as applied to modular computer communication links. It is concluded that it is possible to make a very cost-effective, ultrahigh-speed link by utilizing commercial technology. Low-cost 800-nm lasers allow data links operating in the 500-MHz range to be built with high optical power, permitting the use of less expensive multimode fiber, and lower gain receivers.<>
{"title":"High speed fiber optic link design considerations","authors":"M. Pugh","doi":"10.1109/MILCOM.1988.13358","DOIUrl":"https://doi.org/10.1109/MILCOM.1988.13358","url":null,"abstract":"The design of high-speed optical data links involves a number of factors on which engineering tradeoffs must be made. The author discusses these tradeoffs as applied to modular computer communication links. It is concluded that it is possible to make a very cost-effective, ultrahigh-speed link by utilizing commercial technology. Low-cost 800-nm lasers allow data links operating in the 500-MHz range to be built with high optical power, permitting the use of less expensive multimode fiber, and lower gain receivers.<<ETX>>","PeriodicalId":66166,"journal":{"name":"军事通信技术","volume":"71 1","pages":"1-5 vol.1"},"PeriodicalIF":0.0,"publicationDate":"1988-10-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82673471","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.1988.13515
J. Hauser, D. Baker, D. McGregor, W. Thoet, P. Springston
The authors describe the Distributed Simulation and Prototyping Testbed (DSPT) and show how it is used to develop prototype software. The ability to prototype software offers significant advantages to the successful development of C/sup 3/ systems, which are typically distributed, complex, and hard to test. The DSPT itself is a distributed system. However, its distributed nature is transparent to the user since interprocess communication and synchronization are handled automatically. The DSPT also provides detailed models of physical layer objects, platforms, transmitters, receivers, etc., via a well-defined interface. This interface provides the context for developing models of higher layer protocols. The use of DSPT tools to develop prototype software for the US Navy's Unified Network Technology is considered.<>
{"title":"Prototyping communication system software with the Distributed Simulation and Prototyping Testbed","authors":"J. Hauser, D. Baker, D. McGregor, W. Thoet, P. Springston","doi":"10.1109/MILCOM.1988.13515","DOIUrl":"https://doi.org/10.1109/MILCOM.1988.13515","url":null,"abstract":"The authors describe the Distributed Simulation and Prototyping Testbed (DSPT) and show how it is used to develop prototype software. The ability to prototype software offers significant advantages to the successful development of C/sup 3/ systems, which are typically distributed, complex, and hard to test. The DSPT itself is a distributed system. However, its distributed nature is transparent to the user since interprocess communication and synchronization are handled automatically. The DSPT also provides detailed models of physical layer objects, platforms, transmitters, receivers, etc., via a well-defined interface. This interface provides the context for developing models of higher layer protocols. The use of DSPT tools to develop prototype software for the US Navy's Unified Network Technology is considered.<<ETX>>","PeriodicalId":66166,"journal":{"name":"军事通信技术","volume":"1 1","pages":"1027-1033 vol.3"},"PeriodicalIF":0.0,"publicationDate":"1988-10-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77568976","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.1988.13372
G. J. Luhowy
The author describes the HF modem, which contains a 75 to 2400 bps 39-tone waveform, a robust 75-bps direct-spread waveform, and two independent 45-1200-bps binary frequency-shift-keyed (FSK) waveforms. The availability of powerful new microprocessors permits economic implementation of complex signal-processing sizes. Improved signaling techniques and potent error-correcting codes allow greatly improved performance on the HF channel. Measured performance data taken on HF fading simulators and in numerous on-the-air tests are presented. The performance with and without diversity reception is also shown. An implementation that demonstrates the dramatic reduction in modem size, weight, power consumption, and cost realized by embedding the modem in modern digital radios such as the RF-5000 is presented.<>
{"title":"Advances in HF parallel tone modem technology","authors":"G. J. Luhowy","doi":"10.1109/MILCOM.1988.13372","DOIUrl":"https://doi.org/10.1109/MILCOM.1988.13372","url":null,"abstract":"The author describes the HF modem, which contains a 75 to 2400 bps 39-tone waveform, a robust 75-bps direct-spread waveform, and two independent 45-1200-bps binary frequency-shift-keyed (FSK) waveforms. The availability of powerful new microprocessors permits economic implementation of complex signal-processing sizes. Improved signaling techniques and potent error-correcting codes allow greatly improved performance on the HF channel. Measured performance data taken on HF fading simulators and in numerous on-the-air tests are presented. The performance with and without diversity reception is also shown. An implementation that demonstrates the dramatic reduction in modem size, weight, power consumption, and cost realized by embedding the modem in modern digital radios such as the RF-5000 is presented.<<ETX>>","PeriodicalId":66166,"journal":{"name":"军事通信技术","volume":"8 4","pages":"77-81 vol.1"},"PeriodicalIF":0.0,"publicationDate":"1988-10-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91478870","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.1988.13499
L. Woolford
A mobile Fleet Satellite Communications (FLTSATCOM) system called the Mobile Operational Control Center (MOCC) was developed which has demonstrated the ability to be interoperable with many of the current FLTSATCOM command and control channels. This low-cost system is secure in all its communications, is lightweight, and provides a gateway for other communications formats. The major elements of this system are made up of a personal computer, a protocol microprocessor, and off-the-shelf mobile communication components. It is concluded that with both FLTSATCOM channel protocol and data format interoperability, the MOCC has the ability to provide vital information in or near real time, which significantly improves mission effectiveness.<>
{"title":"FLTSATCOM interoperability applications","authors":"L. Woolford","doi":"10.1109/MILCOM.1988.13499","DOIUrl":"https://doi.org/10.1109/MILCOM.1988.13499","url":null,"abstract":"A mobile Fleet Satellite Communications (FLTSATCOM) system called the Mobile Operational Control Center (MOCC) was developed which has demonstrated the ability to be interoperable with many of the current FLTSATCOM command and control channels. This low-cost system is secure in all its communications, is lightweight, and provides a gateway for other communications formats. The major elements of this system are made up of a personal computer, a protocol microprocessor, and off-the-shelf mobile communication components. It is concluded that with both FLTSATCOM channel protocol and data format interoperability, the MOCC has the ability to provide vital information in or near real time, which significantly improves mission effectiveness.<<ETX>>","PeriodicalId":66166,"journal":{"name":"军事通信技术","volume":"28 1","pages":"921-924 vol.3"},"PeriodicalIF":0.0,"publicationDate":"1988-10-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81908755","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.1988.13387
W. C. Chuang, C. Tsai
To characterize the end-to-end performance of AT&T's ISDN BRI (Integrated Services Digital Network basic rate interface) services, a system called ISDN-ASPEN (Automatic System for Performance Evaluation of the Network) was developed. ISDN-ASPEN is a flexible, automatic data acquisition and analysis system built on the UNIX operating system. This system has the ISDN interface, which provides the capability to measure voice and data services performance at the customer's premises. The performance parameters include postdialing delay, clear configuration delay, customer usages, bit error rate, data transfer delay, and echoplex delay. The ISDN-ASPEN system consists of remote test modules under the control of a centralized host computer. The authors describe the system architecture and capabilities of ISDN-ASPEN and a postdialing delay example is presented.<>
{"title":"ISDN-ASPEN-an ISDN performance evaluation tool","authors":"W. C. Chuang, C. Tsai","doi":"10.1109/MILCOM.1988.13387","DOIUrl":"https://doi.org/10.1109/MILCOM.1988.13387","url":null,"abstract":"To characterize the end-to-end performance of AT&T's ISDN BRI (Integrated Services Digital Network basic rate interface) services, a system called ISDN-ASPEN (Automatic System for Performance Evaluation of the Network) was developed. ISDN-ASPEN is a flexible, automatic data acquisition and analysis system built on the UNIX operating system. This system has the ISDN interface, which provides the capability to measure voice and data services performance at the customer's premises. The performance parameters include postdialing delay, clear configuration delay, customer usages, bit error rate, data transfer delay, and echoplex delay. The ISDN-ASPEN system consists of remote test modules under the control of a centralized host computer. The authors describe the system architecture and capabilities of ISDN-ASPEN and a postdialing delay example is presented.<<ETX>>","PeriodicalId":66166,"journal":{"name":"军事通信技术","volume":"5 1","pages":"175-179 vol.1"},"PeriodicalIF":0.0,"publicationDate":"1988-10-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82801850","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.1988.13518
K. Kim, J. Wakefield
The authors describe a cost-effective means of providing integrated services digital network (ISDN) basic access by satellite to locations which are not near the desired ISDN switch. Satellite access is provided by the ISDN satellite terminal (ISAT). The ISAT transmit and receives the ISDN basic data rate of 144 Kb/s (2B+D) plus the maintenance and service channel of 16 Kb/s (totaling 160 Kb/s) anywhere within satellite coverage, including overseas. System implementation is described.<>
{"title":"ISDN basic access for remote locations","authors":"K. Kim, J. Wakefield","doi":"10.1109/MILCOM.1988.13518","DOIUrl":"https://doi.org/10.1109/MILCOM.1988.13518","url":null,"abstract":"The authors describe a cost-effective means of providing integrated services digital network (ISDN) basic access by satellite to locations which are not near the desired ISDN switch. Satellite access is provided by the ISDN satellite terminal (ISAT). The ISAT transmit and receives the ISDN basic data rate of 144 Kb/s (2B+D) plus the maintenance and service channel of 16 Kb/s (totaling 160 Kb/s) anywhere within satellite coverage, including overseas. System implementation is described.<<ETX>>","PeriodicalId":66166,"journal":{"name":"军事通信技术","volume":"137 1","pages":"1049-1054 vol.3"},"PeriodicalIF":0.0,"publicationDate":"1988-10-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80091681","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.1988.13401
P. Crane
Presents the results of an analysis of data gathered during a meteor burst experiment in Greenland. Bit error patterns are obtained and the performance of automatic request for retransmission and forward error correction (FEC) are compared from the standpoint of throughput and encountered delays with respect to the delivery of a 40-character message. It is demonstrated that throughput can be increased and delays decreased with respect to the delivery of short messages over a meteor burst communications channel by the use of simple FEC techniques. The addition of a low degree interleaver provides additional substantial improvement.<>
{"title":"An empirical analysis of the application of forward error correction to meteor burst communication","authors":"P. Crane","doi":"10.1109/MILCOM.1988.13401","DOIUrl":"https://doi.org/10.1109/MILCOM.1988.13401","url":null,"abstract":"Presents the results of an analysis of data gathered during a meteor burst experiment in Greenland. Bit error patterns are obtained and the performance of automatic request for retransmission and forward error correction (FEC) are compared from the standpoint of throughput and encountered delays with respect to the delivery of a 40-character message. It is demonstrated that throughput can be increased and delays decreased with respect to the delivery of short messages over a meteor burst communications channel by the use of simple FEC techniques. The addition of a low degree interleaver provides additional substantial improvement.<<ETX>>","PeriodicalId":66166,"journal":{"name":"军事通信技术","volume":"43 1","pages":"249-254 vol.1"},"PeriodicalIF":0.0,"publicationDate":"1988-10-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87787263","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.1988.13521
R. Merk, L. Gutman, C. Warner
The authors propose algorithms for supporting voice and data in a tactical ultrahigh-frequency line-of-sight (UHF LOS) network for communications within a Navy task force. The UHF LOS network is being developed by the Navy's Unified Networking Technology (UNT) program. It has properties in common with most tactical networks, and thus the algorithms presented here should be applicable to these networks in general. They have been designed to accommodate the limited bandwidth typical of tactical networks which makes integration of voice and data difficult. Also, the algorithms are robust, efficient, and survivable. The following features are considered: voice and data requirements, broadcast routing, point-to-point routing, channel access, voice algorithms, voice implementation, and channel release.<>
{"title":"Voice and data integration in tactical networks","authors":"R. Merk, L. Gutman, C. Warner","doi":"10.1109/MILCOM.1988.13521","DOIUrl":"https://doi.org/10.1109/MILCOM.1988.13521","url":null,"abstract":"The authors propose algorithms for supporting voice and data in a tactical ultrahigh-frequency line-of-sight (UHF LOS) network for communications within a Navy task force. The UHF LOS network is being developed by the Navy's Unified Networking Technology (UNT) program. It has properties in common with most tactical networks, and thus the algorithms presented here should be applicable to these networks in general. They have been designed to accommodate the limited bandwidth typical of tactical networks which makes integration of voice and data difficult. Also, the algorithms are robust, efficient, and survivable. The following features are considered: voice and data requirements, broadcast routing, point-to-point routing, channel access, voice algorithms, voice implementation, and channel release.<<ETX>>","PeriodicalId":66166,"journal":{"name":"军事通信技术","volume":"14 1","pages":"1069-1073 vol.3"},"PeriodicalIF":0.0,"publicationDate":"1988-10-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87790445","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.1988.13465
P. Feldman
The author analyzes the effect of unanticipated CW and pulsed interference on the throughput of an adaptive hybrid ARQ protocol used with a discrete-time Markovian channel. He evaluates the degradation in the performance of this protocol due to additional, unanticipated interference and shows that the protocol is only slightly suboptimal under these conditions, i.e. only a small part of the degradation can be attributed to the protocol's reliance on incorrect channel statistics. He also shows that the performance of the adaptive protocol is at least as good as that of a simpler nonadaptive protocol over almost the entire range of jammer power levels.<>
{"title":"Effect of interference on throughput of adaptive hybrid ARQ protocol","authors":"P. Feldman","doi":"10.1109/MILCOM.1988.13465","DOIUrl":"https://doi.org/10.1109/MILCOM.1988.13465","url":null,"abstract":"The author analyzes the effect of unanticipated CW and pulsed interference on the throughput of an adaptive hybrid ARQ protocol used with a discrete-time Markovian channel. He evaluates the degradation in the performance of this protocol due to additional, unanticipated interference and shows that the protocol is only slightly suboptimal under these conditions, i.e. only a small part of the degradation can be attributed to the protocol's reliance on incorrect channel statistics. He also shows that the performance of the adaptive protocol is at least as good as that of a simpler nonadaptive protocol over almost the entire range of jammer power levels.<<ETX>>","PeriodicalId":66166,"journal":{"name":"军事通信技术","volume":"14 1","pages":"691-696 vol.2"},"PeriodicalIF":0.0,"publicationDate":"1988-10-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89380272","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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