Pub Date : 1988-10-23DOI: 10.1109/MILCOM.1988.13473
D. Hampel, A. Upton
The authors address the potential uses of GaAs, MMICs, and their benefits, for EHF ground terminals. This assessment of GaAs MMICs (monolithic microwave integrated circuits), while concentrating on the analog RF front end, also includes some associated critical digital functions. Performance requirements and specific application areas, such as 20-GHz low-noise amplifiers and 44-GHz power amplifiers, are discussed and current state-of-the-art performance in low-noise high-electron-mobility transistors (HEMTs) and high efficiency pseudomorphic HEMTs is presented, along with projected performance improvements over the next five years.<>
{"title":"GaAs MMICs for EHF SATCOM ground terminals","authors":"D. Hampel, A. Upton","doi":"10.1109/MILCOM.1988.13473","DOIUrl":"https://doi.org/10.1109/MILCOM.1988.13473","url":null,"abstract":"The authors address the potential uses of GaAs, MMICs, and their benefits, for EHF ground terminals. This assessment of GaAs MMICs (monolithic microwave integrated circuits), while concentrating on the analog RF front end, also includes some associated critical digital functions. Performance requirements and specific application areas, such as 20-GHz low-noise amplifiers and 44-GHz power amplifiers, are discussed and current state-of-the-art performance in low-noise high-electron-mobility transistors (HEMTs) and high efficiency pseudomorphic HEMTs is presented, along with projected performance improvements over the next five years.<<ETX>>","PeriodicalId":66166,"journal":{"name":"军事通信技术","volume":"66 1","pages":"737-741 vol.3"},"PeriodicalIF":0.0,"publicationDate":"1988-10-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89195167","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.1988.13394
Raymond J. Lackey, Herbert F. Baurle, John P. Barile
A systolic processor applicable to a general class of signal processing problems was built using commercially available VLSI floating-point processors. This processor performed over 1.25 BFLOPS (billion floating-point operations per second) in applications of solutions to a group of simultaneous equations with 12 unknowns. The solution was designed to work with the normal equations used in signal processing problems where all equations have noisy component values. The processor design was a direct implementation of algorithm mathematics in hardware and achieved a high processing rate through extensive concurrency. This program demonstrated how a custom, application-specific processor can be developed in less than two years to perform a computationally intensive function.<>
{"title":"Systolic processor array for radar and communications","authors":"Raymond J. Lackey, Herbert F. Baurle, John P. Barile","doi":"10.1109/MILCOM.1988.13394","DOIUrl":"https://doi.org/10.1109/MILCOM.1988.13394","url":null,"abstract":"A systolic processor applicable to a general class of signal processing problems was built using commercially available VLSI floating-point processors. This processor performed over 1.25 BFLOPS (billion floating-point operations per second) in applications of solutions to a group of simultaneous equations with 12 unknowns. The solution was designed to work with the normal equations used in signal processing problems where all equations have noisy component values. The processor design was a direct implementation of algorithm mathematics in hardware and achieved a high processing rate through extensive concurrency. This program demonstrated how a custom, application-specific processor can be developed in less than two years to perform a computationally intensive function.<<ETX>>","PeriodicalId":66166,"journal":{"name":"军事通信技术","volume":"104 1","pages":"205-209 vol.1"},"PeriodicalIF":0.0,"publicationDate":"1988-10-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79321486","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.1988.13519
J. O'Bryan, C. Oestereicher, G. Wright
An integrated protocol architecture has been presented that maps two independent standard sets of protocols providing the aggregate capabilities of both and allowing for other functionalities without modifying the off-the-shelf protocols of the lower transport and levels. The protocol architecture is suitable for communications between devices attached to Ethernet networks, and devices accessing X.25-packet switching networks. The full set of the session protocol is implemented in the XNS/X.25 Gateway Server; a subset is implemented for the XNS side; but both are compatible and rely on the courier remote call procedures to distribute sessions command, response, and error messages.<>
{"title":"XNS-X.25 communications gateway","authors":"J. O'Bryan, C. Oestereicher, G. Wright","doi":"10.1109/MILCOM.1988.13519","DOIUrl":"https://doi.org/10.1109/MILCOM.1988.13519","url":null,"abstract":"An integrated protocol architecture has been presented that maps two independent standard sets of protocols providing the aggregate capabilities of both and allowing for other functionalities without modifying the off-the-shelf protocols of the lower transport and levels. The protocol architecture is suitable for communications between devices attached to Ethernet networks, and devices accessing X.25-packet switching networks. The full set of the session protocol is implemented in the XNS/X.25 Gateway Server; a subset is implemented for the XNS side; but both are compatible and rely on the courier remote call procedures to distribute sessions command, response, and error messages.<<ETX>>","PeriodicalId":66166,"journal":{"name":"军事通信技术","volume":"16 1","pages":"1057-1061 vol.3"},"PeriodicalIF":0.0,"publicationDate":"1988-10-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81990341","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.1988.13405
P. J. Crepeau
The author presents the uncoded and coded performance results of MFSK (M-ary frequency-shift keying) and DPSK (differentially coherent binary phase-shift keying) on a generalized fading-channel model, the slow nonselective Nakagami-m fading channel. Simple expressions are given for asymptotic slopes of probability of bit error for a large signal-to-noise ratio, and it is shown that the effective diversity of the system is in the product of two parameters, one for the code and one for the channel. It is concluded that the results obtained are potentially useful in the performance assessment of several current MFSK and DPSK systems that are required to operate on channels with a wide variety of fading or scintillation conditions.<>
{"title":"Coding performance on generalized fading channels","authors":"P. J. Crepeau","doi":"10.1109/MILCOM.1988.13405","DOIUrl":"https://doi.org/10.1109/MILCOM.1988.13405","url":null,"abstract":"The author presents the uncoded and coded performance results of MFSK (M-ary frequency-shift keying) and DPSK (differentially coherent binary phase-shift keying) on a generalized fading-channel model, the slow nonselective Nakagami-m fading channel. Simple expressions are given for asymptotic slopes of probability of bit error for a large signal-to-noise ratio, and it is shown that the effective diversity of the system is in the product of two parameters, one for the code and one for the channel. It is concluded that the results obtained are potentially useful in the performance assessment of several current MFSK and DPSK systems that are required to operate on channels with a wide variety of fading or scintillation conditions.<<ETX>>","PeriodicalId":66166,"journal":{"name":"军事通信技术","volume":"24 1","pages":"279-285 vol.1"},"PeriodicalIF":0.0,"publicationDate":"1988-10-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81688577","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.1988.13422
H. Steyskal
The current status of digital beamforming (DBF) technology is reviewed. Particular attention is given to the advantages of DBF, including improved adaptive pattern nulling, superresolution, self-calibration, and array element pattern correction. DBF implementation is examined, and examples of DBF systems are mentioned.<>
{"title":"Digital beamforming-an emerging technology","authors":"H. Steyskal","doi":"10.1109/MILCOM.1988.13422","DOIUrl":"https://doi.org/10.1109/MILCOM.1988.13422","url":null,"abstract":"The current status of digital beamforming (DBF) technology is reviewed. Particular attention is given to the advantages of DBF, including improved adaptive pattern nulling, superresolution, self-calibration, and array element pattern correction. DBF implementation is examined, and examples of DBF systems are mentioned.<<ETX>>","PeriodicalId":66166,"journal":{"name":"军事通信技术","volume":"22 1","pages":"399-403 vol.2"},"PeriodicalIF":0.0,"publicationDate":"1988-10-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85025914","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.1988.13426
Jeffrey H. Reed, T. Hsia
An adaptive filtering technique for spectra correlation discrimination is proposed that provides a means of separating signals on the basis of their spectral correlation characteristics, as determined by the signal parameters (modulation type, band rate, chip rate, hop rate, etc). A conceptual description and a theoretical analysis of the spectral correlation discriminator are given, and computer simulations are presented to demonstrate its utility.<>
{"title":"A technique for sorting and detecting signals in interference","authors":"Jeffrey H. Reed, T. Hsia","doi":"10.1109/MILCOM.1988.13426","DOIUrl":"https://doi.org/10.1109/MILCOM.1988.13426","url":null,"abstract":"An adaptive filtering technique for spectra correlation discrimination is proposed that provides a means of separating signals on the basis of their spectral correlation characteristics, as determined by the signal parameters (modulation type, band rate, chip rate, hop rate, etc). A conceptual description and a theoretical analysis of the spectral correlation discriminator are given, and computer simulations are presented to demonstrate its utility.<<ETX>>","PeriodicalId":66166,"journal":{"name":"军事通信技术","volume":"36 1","pages":"425-430 vol.2"},"PeriodicalIF":0.0,"publicationDate":"1988-10-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85067602","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.1988.13462
A. Calderbank
The author designs multilevel trellis codes based on lattices and cosets that provide greater immunity to Gaussian noise and/or greater resistance to impulse noise than previous approaches. He shows how to calculate minimum-squared distance and path multiplicity in terms of the norms and multiplicities of the different cosets. The multilevel structure allows the redundancy in the coset selection procedure to be allocated efficiently among the different levels. The proposed codes admit a staged decoding procedure that requires very few trellis states and has performance/complexity advantages over maximum-likelihood decoding.<>
{"title":"Multi-level trellis codes for the Gaussian channel and for channels subject to impulsive noise","authors":"A. Calderbank","doi":"10.1109/MILCOM.1988.13462","DOIUrl":"https://doi.org/10.1109/MILCOM.1988.13462","url":null,"abstract":"The author designs multilevel trellis codes based on lattices and cosets that provide greater immunity to Gaussian noise and/or greater resistance to impulse noise than previous approaches. He shows how to calculate minimum-squared distance and path multiplicity in terms of the norms and multiplicities of the different cosets. The multilevel structure allows the redundancy in the coset selection procedure to be allocated efficiently among the different levels. The proposed codes admit a staged decoding procedure that requires very few trellis states and has performance/complexity advantages over maximum-likelihood decoding.<<ETX>>","PeriodicalId":66166,"journal":{"name":"军事通信技术","volume":"17 1","pages":"673-678 vol.2"},"PeriodicalIF":0.0,"publicationDate":"1988-10-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78798358","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.1988.13442
M. Ross
The history of space laser communication is sketched. Three steps to establishing a link between platforms-acquisition, tracking, and communication-are described. It is suggested that future advances will greatly ease the tight tolerance requirements and bring down laser communication terminal costs as well as allow small aperture characteristics of space-based systems. This forecast based on rapid advances in semiconductor laser technology, especially at the GaAs laser wavelength. Also important will be the use of wide beams and smaller optics, coherent laser arrays, systems-on-a-chip, and MOCVD growth technology. Technology advances will make systems smaller, lighter, and far less expensive.<>
{"title":"Past progress and future advances in space laser communications","authors":"M. Ross","doi":"10.1109/MILCOM.1988.13442","DOIUrl":"https://doi.org/10.1109/MILCOM.1988.13442","url":null,"abstract":"The history of space laser communication is sketched. Three steps to establishing a link between platforms-acquisition, tracking, and communication-are described. It is suggested that future advances will greatly ease the tight tolerance requirements and bring down laser communication terminal costs as well as allow small aperture characteristics of space-based systems. This forecast based on rapid advances in semiconductor laser technology, especially at the GaAs laser wavelength. Also important will be the use of wide beams and smaller optics, coherent laser arrays, systems-on-a-chip, and MOCVD growth technology. Technology advances will make systems smaller, lighter, and far less expensive.<<ETX>>","PeriodicalId":66166,"journal":{"name":"军事通信技术","volume":"41 1","pages":"527-532 vol.2"},"PeriodicalIF":0.0,"publicationDate":"1988-10-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89575839","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.1988.13458
A. Viterbi, J. Wolf, E. Zehavi
Trellis-coded multiple-phase-shift-keyed (MPSK) modulation is an effective technique for increasing the bandwidth efficiency of an existing channel while maintaining at least a moderate degree of power efficiency through coding. The authors consider the application of this technique to increase markedly the capacity of a 25-kHz military satellite channel. It is shown that with only minor modifications to the QPSK modem to incorporate 8 PSK and 16 PSK modulation and no modification to the rate-1/2 coder used to transmit 16 kb/s over this channel, transmission rates of 32 kb/s and 48 kb/s, can be supported at E/sub b//N/sub 0/ levels only moderately higher than for the lower data rate. In fact, it is demonstrated that 48 Kb/s can be transmitted within exactly the same bandwidth and at the same E/sub b//N/sub 0/ levels as that required to transmit uncoded QPSK at 32 kb/s at bit error rate of 10/sup -5/.<>
{"title":"Trellis-coded MPSK modulation for highly efficient military satellite applications","authors":"A. Viterbi, J. Wolf, E. Zehavi","doi":"10.1109/MILCOM.1988.13458","DOIUrl":"https://doi.org/10.1109/MILCOM.1988.13458","url":null,"abstract":"Trellis-coded multiple-phase-shift-keyed (MPSK) modulation is an effective technique for increasing the bandwidth efficiency of an existing channel while maintaining at least a moderate degree of power efficiency through coding. The authors consider the application of this technique to increase markedly the capacity of a 25-kHz military satellite channel. It is shown that with only minor modifications to the QPSK modem to incorporate 8 PSK and 16 PSK modulation and no modification to the rate-1/2 coder used to transmit 16 kb/s over this channel, transmission rates of 32 kb/s and 48 kb/s, can be supported at E/sub b//N/sub 0/ levels only moderately higher than for the lower data rate. In fact, it is demonstrated that 48 Kb/s can be transmitted within exactly the same bandwidth and at the same E/sub b//N/sub 0/ levels as that required to transmit uncoded QPSK at 32 kb/s at bit error rate of 10/sup -5/.<<ETX>>","PeriodicalId":66166,"journal":{"name":"军事通信技术","volume":"76 1","pages":"647-651 vol.2"},"PeriodicalIF":0.0,"publicationDate":"1988-10-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88075902","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.1988.13362
Tsong-Ho Wu, R. H. Cardwell
The increasing deployment of broadband optical fiber transmission systems and the trend to a fiber-hubbed network architecture have increased concern about the survivability of intra-LATA (local access transport area) telephone fiber networks. Selection of an appropriate survivable network architecture depends upon tradeoffs between cost and survivability. The authors investigate a class of survivable network architectures by studying their quantitative tradeoffs between cost and survivability. A case study based on a metropolitan LATA network has shown that single homing architectures with 1:N diverse protection may provide affordable survivability for fibre cable cuts.<>
{"title":"Survivable network architectures performance for intra-LATA fiber optic networks","authors":"Tsong-Ho Wu, R. H. Cardwell","doi":"10.1109/MILCOM.1988.13362","DOIUrl":"https://doi.org/10.1109/MILCOM.1988.13362","url":null,"abstract":"The increasing deployment of broadband optical fiber transmission systems and the trend to a fiber-hubbed network architecture have increased concern about the survivability of intra-LATA (local access transport area) telephone fiber networks. Selection of an appropriate survivable network architecture depends upon tradeoffs between cost and survivability. The authors investigate a class of survivable network architectures by studying their quantitative tradeoffs between cost and survivability. A case study based on a metropolitan LATA network has shown that single homing architectures with 1:N diverse protection may provide affordable survivability for fibre cable cuts.<<ETX>>","PeriodicalId":66166,"journal":{"name":"军事通信技术","volume":"1 1","pages":"25-30 vol.1"},"PeriodicalIF":0.0,"publicationDate":"1988-10-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89153521","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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