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MILCOM 1983 - IEEE Military Communications Conference最新文献

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Frequency Resolution Enhancement of a Compressive Receiver by Spectral Estimation 用频谱估计增强压缩接收机的频率分辨率
MILCOM 1983 - IEEE Military Communications Conference Pub Date : 1983-12-01 DOI: 10.1109/MILCOM.1983.4794794
R. Mammone, O. McKee, D. Schilling
{"title":"Frequency Resolution Enhancement of a Compressive Receiver by Spectral Estimation","authors":"R. Mammone, O. McKee, D. Schilling","doi":"10.1109/MILCOM.1983.4794794","DOIUrl":"https://doi.org/10.1109/MILCOM.1983.4794794","url":null,"abstract":"Conventional electronic countermeasures (ECM) receivers cannot readily detect the transmission of spread spectrum signals. The ideal (Neyman-Pearson) detector is very difficult to implement since it would require the use of several hundred, and perhaps thousands of matched filters contiguously spaced in frequency. Thus, noncoherent radiometric detectors are generally used due to the simplicity of their implementation. The situation is further complicated by the very low operating signal to noise ratio requirements and the extremely wide bandwidth which must be searched. The detection of spread spectrum transmissions in a tactical situation may be the first step in signal interception or repeat back jamming schemes. It is therefore desirable to detect a signal as rapidly as possible. This detection time (or probability of intercept) is more a function of signal power spectral density for the direct sequence spread spectrum waveform, and the frequency hop rate for a frequency hopping spread spectrum signal. In either case, an optimal receiver is called for with a rapid signal/data processing capability. In this paper, we propose the use of the Chirp Z transform implemented by using a surface acoustic wave (SAW) spectrum analyzer as a detector of jamming signals and other spread spectrum signals. The SAW spectrum analyzer is modeled by a digital implementation of the Chirp Z algorithm. The resulting spectrum will be processed digitally to produce a high resolution (fast) spectral estimate. This estimate will be optimal in the sense that a norm of error is minimized.","PeriodicalId":113679,"journal":{"name":"MILCOM 1983 - IEEE Military Communications Conference","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1983-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131786049","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
Minimum Probability of Error for Asynchronous Multiple Access Communication Systems 异步多址通信系统的最小误差概率
MILCOM 1983 - IEEE Military Communications Conference Pub Date : 1983-12-01 DOI: 10.1109/MILCOM.1983.4794684
S. Verdú
{"title":"Minimum Probability of Error for Asynchronous Multiple Access Communication Systems","authors":"S. Verdú","doi":"10.1109/MILCOM.1983.4794684","DOIUrl":"https://doi.org/10.1109/MILCOM.1983.4794684","url":null,"abstract":"Consider an ideal white gaussian channel shared by K users that transmit independent data streams by modulating antipodally a set of assigned signal waveforms without maintaining relative synchronism among them. This paper investigates the probability of error achievable by an optimum K-user coherent detector. It is shown that unless signals with poor cross-correlation properties are used or the interfering users are comparatively weak, the minimum error probabilities have the same asymptotic behavior as in a single-user communication system, i.e. there is no performance degradation due to the presence of other users. As illustrated by several examples, this implies that in the SNR region of interest, the error probability of the conventional detector is not necessarily close to the minimum even if signals with low cross-correlations are used.","PeriodicalId":113679,"journal":{"name":"MILCOM 1983 - IEEE Military Communications Conference","volume":"27 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1983-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123571954","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: 34
Detection of Non-Gaussian Signals in White Gaussian Noise under a Low Energy Coherence Assumption 低能量相干假设下高斯白噪声中非高斯信号的检测
MILCOM 1983 - IEEE Military Communications Conference Pub Date : 1983-10-01 DOI: 10.1109/MILCOM.1983.4794682
J. Bucklew
{"title":"Detection of Non-Gaussian Signals in White Gaussian Noise under a Low Energy Coherence Assumption","authors":"J. Bucklew","doi":"10.1109/MILCOM.1983.4794682","DOIUrl":"https://doi.org/10.1109/MILCOM.1983.4794682","url":null,"abstract":"In this paper we consider the problem of detecting a non-Gaussian signal in white Gaussian noise. We make a low energy coherence (LEC) assumption and derive receiver structures and performance bounds. We apply some of our results to the detection of spread spectrum or digitally modulated signals in white Gaussian noise.","PeriodicalId":113679,"journal":{"name":"MILCOM 1983 - IEEE Military Communications Conference","volume":"54 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1983-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115307470","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
Spread Spectrum Amplitude/Phase Coding using Binary PN Generators 使用二进制PN发生器的扩频幅度/相位编码
MILCOM 1983 - IEEE Military Communications Conference Pub Date : 1983-10-01 DOI: 10.1109/MILCOM.1983.4794667
E. German
{"title":"Spread Spectrum Amplitude/Phase Coding using Binary PN Generators","authors":"E. German","doi":"10.1109/MILCOM.1983.4794667","DOIUrl":"https://doi.org/10.1109/MILCOM.1983.4794667","url":null,"abstract":"A means of coding a spread spectrum signal so that it appears noise-like in both amplitude and phase is given. Binary PN generators are used to develop the code which becomes Gaussian for a large number of generators. Performance, in terms of signal-to-noise ratio, is asymptotically the same as that of typical bi-phase PSK modulation, or unspread binary communications systems, for large spreading ratios.","PeriodicalId":113679,"journal":{"name":"MILCOM 1983 - IEEE Military Communications Conference","volume":"56 10","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1983-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120934762","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
Autocorrelation Techniques for Wideband Detection of FH Waveforms in White Noise 白噪声下跳频波形宽带检测的自相关技术
MILCOM 1983 - IEEE Military Communications Conference Pub Date : 1983-10-01 DOI: 10.1109/MILCOM.1983.4794806
A. Polydoros, J. Holmes
{"title":"Autocorrelation Techniques for Wideband Detection of FH Waveforms in White Noise","authors":"A. Polydoros, J. Holmes","doi":"10.1109/MILCOM.1983.4794806","DOIUrl":"https://doi.org/10.1109/MILCOM.1983.4794806","url":null,"abstract":"The problem of detecting a frequency-hopping waveform in strong broadband additive white Gaussian noise (AWGN) is discussed. A key premise in the implementation of the detecting receiver is that of constrained complexity. As such, the use of the autocorrelation domain is proposed, and the performance of a decision algorithm is analyzed and compared to the energy discriminator (radiometer). The theory indicates the potential for impressive gains, a conclusion also supported by the simulation results provided.","PeriodicalId":113679,"journal":{"name":"MILCOM 1983 - IEEE Military Communications Conference","volume":"31 4","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1983-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120987609","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
Multilevel Synchronization of Direct Sequence Spread Spectrum Communication Systems 直接序列扩频通信系统的多级同步
MILCOM 1983 - IEEE Military Communications Conference Pub Date : 1983-10-01 DOI: 10.1109/MILCOM.1983.4794729
S. Glisic
{"title":"Multilevel Synchronization of Direct Sequence Spread Spectrum Communication Systems","authors":"S. Glisic","doi":"10.1109/MILCOM.1983.4794729","DOIUrl":"https://doi.org/10.1109/MILCOM.1983.4794729","url":null,"abstract":"A new technique for direct sequence spread spectrum communication system synchronization is presented. This technique is based on the pseudorandom sequence decomposition and partial correlation of the component sequences. Correlator self noise power spectal density, signal to noise ratio degradation and acquisition time performance are analyzed. It is shown that considerable reduction of the average time to acquire synchronization can be achieved using the suggested technique.","PeriodicalId":113679,"journal":{"name":"MILCOM 1983 - IEEE Military Communications Conference","volume":"49 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1983-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126761691","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: 4
Comparison of IONCAP Predictions with AN/TRQ-35(V) Oblique-Incidence Sounder Measurements for a One-Month Conus Test During July and August 1982 1982年7月和8月IONCAP预报与AN/TRQ-35(V)斜入射测深仪测量结果的比较
MILCOM 1983 - IEEE Military Communications Conference Pub Date : 1983-10-01 DOI: 10.1109/MILCOM.1983.4794715
L. O. Harnish, G. Hagn, William T. Alvarez
{"title":"Comparison of IONCAP Predictions with AN/TRQ-35(V) Oblique-Incidence Sounder Measurements for a One-Month Conus Test During July and August 1982","authors":"L. O. Harnish, G. Hagn, William T. Alvarez","doi":"10.1109/MILCOM.1983.4794715","DOIUrl":"https://doi.org/10.1109/MILCOM.1983.4794715","url":null,"abstract":"The US Army Special Forces conducted a one-month test of high frequency (HF) propagation predictability during July and August 1982. One site was located at Ft. Bragg, NC, and it received transmissions from sounders located at Ft. Knox, KY (696 km), Ft. Leavenworth, KS (1439 km), and Ft. Lewis, WA (3830 km). AN/TRQ-35(V) oblique-incidence ionospheric sounders were used on each of the test paths at least once each hour for each of the 29 test days. Frequency reliability tables (FRTs) were generated two months prior to the test by the US Army Communications-Electronics Engineering Installation Agency (USACEEIA), Ft. Huachuca, AZ using the Ionospheric Communications Analysis and Prediction (IONCAP) program. In this paper, the IONCAP predictions are compared with the sounder measurements.","PeriodicalId":113679,"journal":{"name":"MILCOM 1983 - IEEE Military Communications Conference","volume":"55 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1983-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115033152","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
Direct Services Dialing; A New Synergy Between Public & Private Services 直接服务拨号;公共和私人服务的新协同
MILCOM 1983 - IEEE Military Communications Conference Pub Date : 1983-10-01 DOI: 10.1109/MILCOM.1983.4794720
Fred Weismiller, David Lee
{"title":"Direct Services Dialing; A New Synergy Between Public & Private Services","authors":"Fred Weismiller, David Lee","doi":"10.1109/MILCOM.1983.4794720","DOIUrl":"https://doi.org/10.1109/MILCOM.1983.4794720","url":null,"abstract":"In the last few years, AT&T has introduced Calling Card and Expanded 800 Services, providing increased speed, flexibility and economy. These services are based on a new network architecture using toll CCIS with a new, centralized, software based processor. The next logical step is the development of what has been called a new closed user group capability within the Public Switched Network (PSN). If implemented, such a capability could provide commercial and administrative Government users better price predictability, easier administration, greater flexibility and some improvement in privacy.","PeriodicalId":113679,"journal":{"name":"MILCOM 1983 - IEEE Military Communications Conference","volume":"284 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1983-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122554935","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
A Characterization of Underwater Acoustic Channels for Communication System Design 用于通信系统设计的水声信道表征
MILCOM 1983 - IEEE Military Communications Conference Pub Date : 1983-10-01 DOI: 10.1109/MILCOM.1983.4794734
S. Adams, M. H. Brill
{"title":"A Characterization of Underwater Acoustic Channels for Communication System Design","authors":"S. Adams, M. H. Brill","doi":"10.1109/MILCOM.1983.4794734","DOIUrl":"https://doi.org/10.1109/MILCOM.1983.4794734","url":null,"abstract":"The underwater acoustic propagation channel fluctuates with respect to both space and time. This paper presents a mathematical characterization of the propagation channel and reviews recent published experimental progagation data. The ocean ambient noise characteristics are also discussed. The underwater acoustic channel exhibits relatively rapid space-time fluctuations which impose serious constraints on the system design and performance. The channel effects on several conventional signalling schemes is calculated and the need for more sophisticated approaches is shown. The existing channel capacity results for fluctuating channels are presented and system performance predictions discussed relative to these results.","PeriodicalId":113679,"journal":{"name":"MILCOM 1983 - IEEE Military Communications Conference","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1983-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122764954","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
Antijam Capability of Frequency-Hop Spread-Spectrum with Reed-Solomon Coding 基于Reed-Solomon编码的频跳扩频抗干扰能力
MILCOM 1983 - IEEE Military Communications Conference Pub Date : 1983-10-01 DOI: 10.1109/MILCOM.1983.4794652
M. Pursley, W. Stark
{"title":"Antijam Capability of Frequency-Hop Spread-Spectrum with Reed-Solomon Coding","authors":"M. Pursley, W. Stark","doi":"10.1109/MILCOM.1983.4794652","DOIUrl":"https://doi.org/10.1109/MILCOM.1983.4794652","url":null,"abstract":"This paper is concerned with increasing the antijam (AJ) capability of frequency-hop spread-spectrum through the use of diversity transmission, Reed-Solomon coding, and a parallel errors and erasures decoding algorithm. The goals are twofold. First it is desirable to increase the jamming margin against a partial-band noise jammer by use of coding and diversity with an efficient error-correction algorithm. Second, it is necessary to totally eliminate the threat of a narrowband jammer (regardless of the jammer's power level) in order to have an effective AJ system. Through an analysis of the effects of partial-band jamming on a frequency-hop spread-spectrum system with diversity, it is shown that the use of Reed-Solomon coding with a parallel errors and erasures decoding algorithm accomplishes these goals. The paper also investigates the accuracy of the Chernoff bound as an approximation to the true performance of a frequency-hop spread-spectrum communication system with diversity, side information, and Reed-Solomon coding. The performance results presented in the paper are exact results based on analysis and computer evaluation and approximate results based on the Chernoff bound. It is shown that the Chernoff bound gives a very poor approximation for many cases of interest.","PeriodicalId":113679,"journal":{"name":"MILCOM 1983 - IEEE Military Communications Conference","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1983-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117043916","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: 11
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