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MILCOM 97 MILCOM 97 Proceedings最新文献

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A reliable multicast transport protocol for a Global Broadcast Service-based network 一种可靠的多播传输协议，用于基于全球广播服务的网络
MILCOM 97 MILCOM 97 Proceedings Pub Date : 1997-11-02 DOI: 10.1109/MILCOM.1997.646765
F. Bauer, M. Brown
{"title":"A reliable multicast transport protocol for a Global Broadcast Service-based network","authors":"F. Bauer, M. Brown","doi":"10.1109/MILCOM.1997.646765","DOIUrl":"https://doi.org/10.1109/MILCOM.1997.646765","url":null,"abstract":"The Global Broadcast Service (GBS), a direct broadcast satellite network, connects military units in remote corners of the world using low-cost receive-only terminals. The marriage of GBS' network reach and commercial, off-the-shelf Internet software could connect these same units into a global internetwork and substantially improve battlefield communications and capabilities. This paper focuses on the efforts made in the DARPA BADD ACTD to lay the groundwork for future Internet applications of particular interest: multicast applications. Since no single, widely accepted reliable multicast protocol yet exists, we introduce and describe the Transport for Reliable Multicast (TRM) and a sample multicast application using TRM, the proxy Web server. The multicast proxy server is used to disseminate Web pages of interest to remote Web servers in the same multicast group.","PeriodicalId":351392,"journal":{"name":"MILCOM 97 MILCOM 97 Proceedings","volume":"35 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-11-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126406420","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}
引用次数: 6
Neural-network superresolution 神经网络超限分辨
MILCOM 97 MILCOM 97 Proceedings Pub Date : 1997-11-02 DOI: 10.1109/MILCOM.1997.645036
D. Torrieri, K. Bakhru
{"title":"Neural-network superresolution","authors":"D. Torrieri, K. Bakhru","doi":"10.1109/MILCOM.1997.645036","DOIUrl":"https://doi.org/10.1109/MILCOM.1997.645036","url":null,"abstract":"The design options of superresolution using a neural network are discussed. Four specific neural-network architectures using different preprocessors are described, and their performances are compared. The correlation transformer is found to be the preprocessor that provides the best performance and the simplest implementation. The correlation transformer converts N complex inputs derived from a phased-array antenna into N(N+1)/2 complex outputs that are applied to the neural-network.","PeriodicalId":351392,"journal":{"name":"MILCOM 97 MILCOM 97 Proceedings","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-11-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128100536","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}
引用次数: 5
A model of high frequencies (H.F) channel used to design a modem of 9600 bits/s rate in 3 kHz of bandwidth 高频信道模型，用于在3khz带宽下设计9600比特/秒速率的调制解调器
MILCOM 97 MILCOM 97 Proceedings Pub Date : 1997-11-02 DOI: 10.1109/MILCOM.1997.648731
M. Leconte, M. Testard
{"title":"A model of high frequencies (H.F) channel used to design a modem of 9600 bits/s rate in 3 kHz of bandwidth","authors":"M. Leconte, M. Testard","doi":"10.1109/MILCOM.1997.648731","DOIUrl":"https://doi.org/10.1109/MILCOM.1997.648731","url":null,"abstract":"Our goal is to develop an HF transmission system, thus, we need to model the ionospheric channel. We define our HF channel model starting from its weighting function g(t,/spl tau/) and its transfer function G(f,t) variable in time. Study of the correlation function of the channel filter allows to characterize the channel model with two fundamental parameters used to design any modem: the coherence bandwidth B/sub c/ and the coherence time T/sub c/.","PeriodicalId":351392,"journal":{"name":"MILCOM 97 MILCOM 97 Proceedings","volume":"78 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-11-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129975202","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}
引用次数: 6
Applications of space-time adaptive processing in wireless communications 时空自适应处理在无线通信中的应用
MILCOM 97 MILCOM 97 Proceedings Pub Date : 1997-11-02 DOI: 10.1109/MILCOM.1997.644869
P.M. Haimovich, A. Shah
{"title":"Applications of space-time adaptive processing in wireless communications","authors":"P.M. Haimovich, A. Shah","doi":"10.1109/MILCOM.1997.644869","DOIUrl":"https://doi.org/10.1109/MILCOM.1997.644869","url":null,"abstract":"This paper studies the application of space-time adaptive processing (STAP) to increase the performance of wireless communications. STAP applied to CDMA systems is an efficient means to increase the capacity by providing diversity paths to combat multipath and by suppressing interference through spatial-temporal filtering. STAP may also be used to harden commercial systems for military applications by rejecting narrowband interferences in overlay situations. The main advantage of interference suppression in the spatial domain is its robustness with respect to the interference bandwidth. The performance of several STAP architectures is reviewed. The performance of wireless systems with array processing or STAP is degraded by errors in the estimation of the covariance matrix due to finite sample effects. Full and reduced-rank methods are analyzed with respect to their robustness to finite sample effects.","PeriodicalId":351392,"journal":{"name":"MILCOM 97 MILCOM 97 Proceedings","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-11-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131156241","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}
引用次数: 5
On-the-move high-capacity trunk radio: laboratory simulation 移动大容量干线无线电:实验室模拟
MILCOM 97 MILCOM 97 Proceedings Pub Date : 1997-11-02 DOI: 10.1109/MILCOM.1997.645017
C.W. Prettie, V. Procopio, W. Barnett
{"title":"On-the-move high-capacity trunk radio: laboratory simulation","authors":"C.W. Prettie, V. Procopio, W. Barnett","doi":"10.1109/MILCOM.1997.645017","DOIUrl":"https://doi.org/10.1109/MILCOM.1997.645017","url":null,"abstract":"This paper describes laboratory measurements made in support of the US Army Communications-Electronics Command (CECOM) on-the-move high-capacity trunk radio research and development program. The measurements assess the demodulator performance in a multipath environment and dynamic adaptive equalization as a mitigation technique for microwave broadband wireless links with data rates up to 156 Mbps. Modulation schemes range from QPSK to 256 QAM. Channel simulators are used to generate a wide range of multipath delays. Adaptive dynamic equalization, with the number of equalizer taps ranging from none to 128, is used to reduce intersymbol interference (ISI) caused by multipath.","PeriodicalId":351392,"journal":{"name":"MILCOM 97 MILCOM 97 Proceedings","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-11-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132848450","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}
引用次数: 1
Modulation classification of QAM schemes using the DFT of phase histogram combined with modulus information 结合模量信息的相位直方图DFT的QAM调制分类
MILCOM 97 MILCOM 97 Proceedings Pub Date : 1997-11-02 DOI: 10.1109/MILCOM.1997.644992
C. Schreyogg, J. Reichert
{"title":"Modulation classification of QAM schemes using the DFT of phase histogram combined with modulus information","authors":"C. Schreyogg, J. Reichert","doi":"10.1109/MILCOM.1997.644992","DOIUrl":"https://doi.org/10.1109/MILCOM.1997.644992","url":null,"abstract":"We present a method to classify various QAM signal constellations by separately analysing the DFT of the phase histogram and applying knowledge about the distribution of the magnitude. The analysis is carried out using the maximum likelihood approach in both cases. In the paper the likelihood functions are derived and a rule to combine these for classification is given. Furthermore the classification performance for BPSK, QPSK, 8-PSK, V.29Fallback (V.29F,8QAM), V.29 (16QAM) and V.32Fallback-signals (V.32F,16QAM) is shown by numerical simulations.","PeriodicalId":351392,"journal":{"name":"MILCOM 97 MILCOM 97 Proceedings","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-11-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132589927","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}
引用次数: 30
Suboptimum multiuser detection of the QS-CDMA systems using antenna array 采用天线阵列的QS-CDMA系统次优多用户检测
MILCOM 97 MILCOM 97 Proceedings Pub Date : 1997-11-02 DOI: 10.1109/MILCOM.1997.646729
K. S. Kim, Sun Yong Kim, Jooshik Lee, I. Song, Seong-Ro Lee, Jinsoo Bae
{"title":"Suboptimum multiuser detection of the QS-CDMA systems using antenna array","authors":"K. S. Kim, Sun Yong Kim, Jooshik Lee, I. Song, Seong-Ro Lee, Jinsoo Bae","doi":"10.1109/MILCOM.1997.646729","DOIUrl":"https://doi.org/10.1109/MILCOM.1997.646729","url":null,"abstract":"Multiuser detection has been an interesting topic because of its capability of eliminating multiuser interference and resistance to the near-far problem. The decorrelator approach has been investigated as a suboptimum multiuser detector for a low complexity receiver at the expense of the enhancement and correlation of noise. We consider a quasi-maximum likelihood (quasi-ML) detector in the reverse link system which uses antenna arrays in quasi-synchronous channels. It is shown that the performance of the system is better than that of the conventional decorrelator and that the performance gain over the conventional decorrelator system increases as the number of active users and number of antenna arrays increase.","PeriodicalId":351392,"journal":{"name":"MILCOM 97 MILCOM 97 Proceedings","volume":"118 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-11-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132761594","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}
引用次数: 2
Joint Tactical Information Distribution System (JTIDS)/multi-link test device (MLTD) laboratory environment test system 联合战术信息分发系统(JTIDS)/多链路测试装置(MLTD)实验室环境测试系统
MILCOM 97 MILCOM 97 Proceedings Pub Date : 1997-11-02 DOI: 10.1109/MILCOM.1997.648743
F. Goldstein, M. Mcdonough
{"title":"Joint Tactical Information Distribution System (JTIDS)/multi-link test device (MLTD) laboratory environment test system","authors":"F. Goldstein, M. Mcdonough","doi":"10.1109/MILCOM.1997.648743","DOIUrl":"https://doi.org/10.1109/MILCOM.1997.648743","url":null,"abstract":"This paper describes the development and implementation of a unique test tool/environment to support Tactical Data Information Link (TADIL) communication link integration, test, and simulation experiments. Both the software and hardware principal components, as well as their configurations, are discussed. Three separate and distinct operating modes of the JTD/MLTD system are addressed, and these include (1) host surrogate configuration, (2) JTIDS/MIDS surrogate configuration, and (3) interface monitor configuration. The paper provides highlights of integration testing and TADIL test message traffic emulation, for those JTD/MLTD systems installed both at military test and certification facilities as well as private industry sites. The paper addresses near term and future directions of the development programs, as well as recommendations for enhancements to the fielded systems.","PeriodicalId":351392,"journal":{"name":"MILCOM 97 MILCOM 97 Proceedings","volume":"168 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-11-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115351418","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}
引用次数: 2
GMSK linearization and structured channel estimate for GSM signals GSM信号的GMSK线性化和结构化信道估计
MILCOM 97 MILCOM 97 Proceedings Pub Date : 1997-11-02 DOI: 10.1109/MILCOM.1997.646733
Jen-Wei Liang, B. Ng, J.-T. Chen, A. Paulraj
{"title":"GMSK linearization and structured channel estimate for GSM signals","authors":"Jen-Wei Liang, B. Ng, J.-T. Chen, A. Paulraj","doi":"10.1109/MILCOM.1997.646733","DOIUrl":"https://doi.org/10.1109/MILCOM.1997.646733","url":null,"abstract":"GMSK is a spectrum-efficient modulation scheme, and it is adopted as the modulation standard of GSM systems. However, because of its phase modulation, Gaussian filtering, and partial response signaling properties, GMSK is not a linear modulation. We present a linear approximation of GMSK signals at T/2 fractional spacing. The partial response channel with a memory length of 3 symbol periods, which is the pulse-shaping function inherent in the GMSK modulation, can be clearly identified in this linear approximation. Further more, we use this partial response channel information in the estimation of the wireless channel, which includes the physical propagation channel and the modulation pulse-shaping function. Conventional channel estimators, e.g., correlator or least-squares estimator approaches, do not exploit the information of the pulse-shaping function which is known and available. Our proposed structured channel estimate is more accurate since we incorporate the knowledge of the channel structure in the estimation procedure. We compared the BER (bit-error-probability) performance of a GSM system with the structured and unstructured channel estimate, and simulation results show the improvement of a Viterbi equalizer in different test channels when a structured channel estimate is used.","PeriodicalId":351392,"journal":{"name":"MILCOM 97 MILCOM 97 Proceedings","volume":"286 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-11-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115602012","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}
引用次数: 21
On-line adaptive estimation of symbol period 符号周期的在线自适应估计
MILCOM 97 MILCOM 97 Proceedings Pub Date : 1997-11-02 DOI: 10.1109/MILCOM.1997.644873
M. Doroslovaeki, L. Yao
{"title":"On-line adaptive estimation of symbol period","authors":"M. Doroslovaeki, L. Yao","doi":"10.1109/MILCOM.1997.644873","DOIUrl":"https://doi.org/10.1109/MILCOM.1997.644873","url":null,"abstract":"The application of the least-mean-square (LMS) and recursive-least-square (RLS) algorithms to the estimation of symbol period is discussed. The algorithms are based on the measurement of the time between two consecutive detected transitions in noisy waveforms. Two versions of the algorithm are developed for white and colored measurement noise models. Conditions are derived that guarantee proper behavior, i.e. the convergence, of the LMS and RLS algorithms. Simulation results show the convergence of algorithms and compare the algorithms with respect to convergence speed.","PeriodicalId":351392,"journal":{"name":"MILCOM 97 MILCOM 97 Proceedings","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-11-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115054817","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}
引用次数: 1
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