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MILCOM 1999. IEEE Military Communications. Conference Proceedings (Cat. No.99CH36341)最新文献

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Propagation measurement-based probability of error predictions for the tactical VHF-range 战术甚高频范围基于传播测量的误差概率预测
MILCOM 1999. IEEE Military Communications. Conference Proceedings (Cat. No.99CH36341) Pub Date : 1999-10-31 DOI: 10.1109/MILCOM.1999.822698
H. Safer, G. Berger, F. Seifert
{"title":"Propagation measurement-based probability of error predictions for the tactical VHF-range","authors":"H. Safer, G. Berger, F. Seifert","doi":"10.1109/MILCOM.1999.822698","DOIUrl":"https://doi.org/10.1109/MILCOM.1999.822698","url":null,"abstract":"This paper is concerned with the performance of binary frequency-shift keyed (BFSK) communication over frequency-selective fading channels in the tactical VHF-range. Channel parameters were extracted from time-series measurements of channel impulse response data. These data were recorded during channel measurements in several mountainous areas in the Austrian Alps with a wideband channel sounder, developed in our laboratory. Based on these parameters expressions of the bit error rate (BER) are derived. Calculations using the demonstrated method show that for typical data rates (2 kbit/s-20 kbit/s) an error floor between 10/sup -4/ and 10/sup -1/ is predicted. An error free uncoded communication in the tactical VHF range is impossible in these environments.","PeriodicalId":334957,"journal":{"name":"MILCOM 1999. IEEE Military Communications. Conference Proceedings (Cat. No.99CH36341)","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132772514","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: 3
Asymmetric modulation and multistage coding for multicasting with multi-level reception over fading channels 在衰落信道上具有多级接收的多播的非对称调制和多级编码
MILCOM 1999. IEEE Military Communications. Conference Proceedings (Cat. No.99CH36341) Pub Date : 1999-10-31 DOI: 10.1109/MILCOM.1999.822649
M. Khairy, E. Geraniotis
{"title":"Asymmetric modulation and multistage coding for multicasting with multi-level reception over fading channels","authors":"M. Khairy, E. Geraniotis","doi":"10.1109/MILCOM.1999.822649","DOIUrl":"https://doi.org/10.1109/MILCOM.1999.822649","url":null,"abstract":"We investigate the application of joint iterative decoding and channel estimation for the transmission of multilevel coded signals using asymmetric QPSK modulation over flat Rayleigh fading channels. The goal is the transmission of multiresolution data streams to receivers with multi-level reception capabilities. We consider two types of receivers: the receivers in the first class can decode only the most significant bit (MSB) of the transmitted information; the receivers in the second class decode both the MSB and the LSB (least significant bit). Symbol aided demodulation (SAD) is used according to which known symbols are inserted in the encoded data stream to assist in the channel estimation process. Furthermore, an iterative algorithm is proposed that uses soft decoding information in addition to the information contained in the known symbols to improve the estimation of the fading channel. Simulation results show significant performance gains of the new scheme over both differential demodulation and conventional SAD.","PeriodicalId":334957,"journal":{"name":"MILCOM 1999. IEEE Military Communications. Conference Proceedings (Cat. No.99CH36341)","volume":"44 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129232714","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
An adaptive multicarrier DS/CDMA system for forward links 前向链路的自适应多载波DS/CDMA系统
MILCOM 1999. IEEE Military Communications. Conference Proceedings (Cat. No.99CH36341) Pub Date : 1999-10-31 DOI: 10.1109/MILCOM.1999.821372
Y. Kim, I. Song, Dae Han Won, Ju Mi Lee, H. Kim
{"title":"An adaptive multicarrier DS/CDMA system for forward links","authors":"Y. Kim, I. Song, Dae Han Won, Ju Mi Lee, H. Kim","doi":"10.1109/MILCOM.1999.821372","DOIUrl":"https://doi.org/10.1109/MILCOM.1999.821372","url":null,"abstract":"We propose a multicarrier CDMA system with an adaptive subchannel allocation method for forward links. In the proposed system, each user's DS waveform is transmitted over the user's favorite subchannel having the largest fading amplitude among the subchannels. We analyze the performance of the system when orthogonal and random signature sequences are used and compare the performance with that of the multicarrier DS/CDMA system using frequency diversity. The results show that the proposed system has a performance gain over the frequency diversity system. We also investigate how the performance is influenced when the user's signal is not perfectly allocated into the best subchannel.","PeriodicalId":334957,"journal":{"name":"MILCOM 1999. IEEE Military Communications. Conference Proceedings (Cat. No.99CH36341)","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125452998","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: 0
ATM for naval applications 用于海军的ATM
MILCOM 1999. IEEE Military Communications. Conference Proceedings (Cat. No.99CH36341) Pub Date : 1999-10-31 DOI: 10.1109/MILCOM.1999.822710
R. A. Colton, J. Airst, D. Aschkenasy, D. Goldsmith
{"title":"ATM for naval applications","authors":"R. A. Colton, J. Airst, D. Aschkenasy, D. Goldsmith","doi":"10.1109/MILCOM.1999.822710","DOIUrl":"https://doi.org/10.1109/MILCOM.1999.822710","url":null,"abstract":"As a tactical user of network services, the US Navy is distinguished by its mobility and its use of low-bandwidth wireless links. ATM technology optimizes bandwidth usage and guarantees QoS for high priority applications. However, wireless and low data rate ATM specifications are just beginning to have commercial availability. This paper discusses the status of emerging ATM specifications that will satisfy US Navy tactical communications requirements.","PeriodicalId":334957,"journal":{"name":"MILCOM 1999. IEEE Military Communications. Conference Proceedings (Cat. No.99CH36341)","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126901424","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
Rank-based detection of random signals in a weakly dependent noise model 弱相关噪声模型中随机信号的秩检测
MILCOM 1999. IEEE Military Communications. Conference Proceedings (Cat. No.99CH36341) Pub Date : 1999-10-31 DOI: 10.1109/MILCOM.1999.822676
K. S. Kim, Hye Jung Jung, Sun Yong Kim, I. Song, Jung Hoon Lee
{"title":"Rank-based detection of random signals in a weakly dependent noise model","authors":"K. S. Kim, Hye Jung Jung, Sun Yong Kim, I. Song, Jung Hoon Lee","doi":"10.1109/MILCOM.1999.822676","DOIUrl":"https://doi.org/10.1109/MILCOM.1999.822676","url":null,"abstract":"We consider nonparametric signal detection problems under the presence of additive noise exhibiting weak dependence. We derive the test statistic of the locally optimum rank detector under a weakly dependent noise model for random signals. The performance characteristics of the locally optimum rank detector are analyzed in terms of asymptotic relative efficiency.","PeriodicalId":334957,"journal":{"name":"MILCOM 1999. IEEE Military Communications. Conference Proceedings (Cat. No.99CH36341)","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123147839","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
MCM-DSSS with DPSK modulation and equal gain combining in Doppler-spread Rician fading 基于DPSK调制和等增益组合的MCM-DSSS多普勒扩频技术
MILCOM 1999. IEEE Military Communications. Conference Proceedings (Cat. No.99CH36341) Pub Date : 1999-10-31 DOI: 10.1109/MILCOM.1999.821373
R. E. Zierner, Thad Welch
{"title":"MCM-DSSS with DPSK modulation and equal gain combining in Doppler-spread Rician fading","authors":"R. E. Zierner, Thad Welch","doi":"10.1109/MILCOM.1999.821373","DOIUrl":"https://doi.org/10.1109/MILCOM.1999.821373","url":null,"abstract":"A method for computing the bit error probability (BEP) of multi-carrier modulated (MCM) direct-sequence spread-spectrum (DSSS) using differentially coherent phase-shift keying (DPSK) with equal gain combining in Doppler-spread Rician fading is given. It is based on Gauss-Chebyshev quadrature integration of the moment generating function of the decision statistic at the combiner output. The results show that as the specular to diffuse power ratio, K, increases the crossover points of the BEP curves for various orders of diversity (number of MCM carriers) occur at increasing values of average energy per-bit-to-noise spectral density ratio (SNR). Thus, for low to moderate SNRs, increased diversity may not give improvement while, for sufficiently high SNRs it does.","PeriodicalId":334957,"journal":{"name":"MILCOM 1999. IEEE Military Communications. Conference Proceedings (Cat. No.99CH36341)","volume":"233 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122981935","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: 0
Performance of high rate Link-22 operation obtained by using quadrature amplitude modulation (QAM) 正交调幅(QAM)获得的高速率Link-22运算性能
MILCOM 1999. IEEE Military Communications. Conference Proceedings (Cat. No.99CH36341) Pub Date : 1999-10-31 DOI: 10.1109/MILCOM.1999.821349
R. LeFever, R. Harper
{"title":"Performance of high rate Link-22 operation obtained by using quadrature amplitude modulation (QAM)","authors":"R. LeFever, R. Harper","doi":"10.1109/MILCOM.1999.821349","DOIUrl":"https://doi.org/10.1109/MILCOM.1999.821349","url":null,"abstract":"As part of its Improved Link-11 program, NATO is currently developing the Link-22 system for the dissemination of F-series messages over tactical voice band HF links. Link-22 uses a TDMA protocol with a 112.5 ms slot time as currently specified, Link-22 has the capability to transmit from 2 to 6 F-series messages per TDMA slot. We present a method for extending this figure to 16. Quadrature amplitude modulation is used to provide the increased channel bit rates that are required. Simulation and field test results are presented which compare the performance of the current and extended rate systems.","PeriodicalId":334957,"journal":{"name":"MILCOM 1999. IEEE Military Communications. Conference Proceedings (Cat. No.99CH36341)","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123019572","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
Improved performance of reduced M-ary orthogonal signaling using Reed-Solomon codes 利用Reed-Solomon码改进了减少M-ary正交信号的性能
MILCOM 1999. IEEE Military Communications. Conference Proceedings (Cat. No.99CH36341) Pub Date : 1999-10-31 DOI: 10.1109/MILCOM.1999.822643
L. Joiner, J. Komo
{"title":"Improved performance of reduced M-ary orthogonal signaling using Reed-Solomon codes","authors":"L. Joiner, J. Komo","doi":"10.1109/MILCOM.1999.822643","DOIUrl":"https://doi.org/10.1109/MILCOM.1999.822643","url":null,"abstract":"This paper presents a comparison of communication systems using different signal constellation sizes and Reed-Solomon code sizes with different rates so that the overall required bandwidth is the same for each system. In these comparisons the channel symbol size is smaller than the code symbol size, so that a code symbol contains parts of more than one channel symbol. Thus, the normal assumption of independent code symbols does not apply. Instead consideration must be taken to obtain the best arrangement of channel symbols in each code symbol. Analytical expressions are derived to compare the bit error probability performance of comparable systems based on individual codewords.","PeriodicalId":334957,"journal":{"name":"MILCOM 1999. IEEE Military Communications. Conference Proceedings (Cat. No.99CH36341)","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123034868","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
A virtual reality C3 network battle management and analysis tool 虚拟现实C3网络作战管理与分析工具
MILCOM 1999. IEEE Military Communications. Conference Proceedings (Cat. No.99CH36341) Pub Date : 1999-10-31 DOI: 10.1109/MILCOM.1999.821388
J. Brand, A. Brodeen, R. Coleman, M. Lopez, D. Meyer, K. Preston, M. Thurber
{"title":"A virtual reality C3 network battle management and analysis tool","authors":"J. Brand, A. Brodeen, R. Coleman, M. Lopez, D. Meyer, K. Preston, M. Thurber","doi":"10.1109/MILCOM.1999.821388","DOIUrl":"https://doi.org/10.1109/MILCOM.1999.821388","url":null,"abstract":"A software package is being developed to improve the situation awareness of network managers by application of virtual reality (VR) techniques. The situation awareness virtual environment for command, control, and communications networks (SaveC3) package gathers network and, in a military application, battlefield status information, from disparate sources and displays the information as text and pictures. The visualization makes use of simple \"glyphs\" or status icons, along with tactical overlays (battle plans) and unit locations on three-dimensional terrain. The display can be by VR headset or by a three-dimensional perspective representation on a two-dimensional screen.","PeriodicalId":334957,"journal":{"name":"MILCOM 1999. IEEE Military Communications. Conference Proceedings (Cat. No.99CH36341)","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121060511","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
Robustness of the MUSIC algorithm to errors in estimation of the dimensions of the subspaces: delay estimation in DS/SS in the presence of interference MUSIC算法对子空间维数估计误差的鲁棒性:存在干扰时DS/SS的延迟估计
MILCOM 1999. IEEE Military Communications. Conference Proceedings (Cat. No.99CH36341) Pub Date : 1999-10-31 DOI: 10.1109/MILCOM.1999.821323
H. Saarnisaari
{"title":"Robustness of the MUSIC algorithm to errors in estimation of the dimensions of the subspaces: delay estimation in DS/SS in the presence of interference","authors":"H. Saarnisaari","doi":"10.1109/MILCOM.1999.821323","DOIUrl":"https://doi.org/10.1109/MILCOM.1999.821323","url":null,"abstract":"The performance of the MUSIC estimator is studied by simulations if the estimator is applied for delay estimation of a direct sequence spread spectrum (DS/SS) signal corrupted by multiple access or multipath interference. Special emphasis is on the sensitivity to estimation errors on the dimension of the signal subspace, which case is also analytically investigated. The results show that the MUSIC estimator can mitigate the effects of other DS/SS signals, if the dimension of the signal subspace is not under-modeled. Also, it is quite sensitive to a multipath signal in a fixed channel if the delay separation is smaller than the chip duration.","PeriodicalId":334957,"journal":{"name":"MILCOM 1999. IEEE Military Communications. Conference Proceedings (Cat. No.99CH36341)","volume":"46 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121471150","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: 9
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