MILCOM 1999. IEEE Military Communications. Conference Proceedings (Cat. No.99CH36341)最新文献_第6页

A new algorithm for network probabilistic connectivity 一种新的网络概率连通性算法

MILCOM 1999. IEEE Military Communications. Conference Proceedings (Cat. No.99CH36341) Pub Date : 1999-10-31 DOI: 10.1109/MILCOM.1999.821337

Yubin Chen, Jiandong Li, Jiamo Chen

引用次数: 5

Efficient use of the processing gain for coded hybrid SFH/DS-CDMA: analytical analysis 编码混合SFH/DS-CDMA处理增益的有效利用:分析分析

MILCOM 1999. IEEE Military Communications. Conference Proceedings (Cat. No.99CH36341) Pub Date : 1999-10-31 DOI: 10.1109/MILCOM.1999.822670

A. Jullian

引用次数: 2

Pilot symbol assisted QAM with iterative filtering and turbo decoding over Rayleigh flat-fading channels 在瑞利平衰落信道上，导频符号辅助QAM的迭代滤波和turbo译码

MILCOM 1999. IEEE Military Communications. Conference Proceedings (Cat. No.99CH36341) Pub Date : 1999-10-31 DOI: 10.1109/MILCOM.1999.822648

Yingjiu Xu, Hsuan-Jung Su, E. Geraniotis

{"title":"Pilot symbol assisted QAM with iterative filtering and turbo decoding over Rayleigh flat-fading channels","authors":"Yingjiu Xu, Hsuan-Jung Su, E. Geraniotis","doi":"10.1109/MILCOM.1999.822648","DOIUrl":"https://doi.org/10.1109/MILCOM.1999.822648","url":null,"abstract":"We investigate the application of iterative channel estimation and decoding for turbo coded M-QAM signals transmitted over slow Rayleigh fading channels. Pilot symbols are inserted periodically in the encoded data stream for the estimation of the time-variant channel state information (CSI). The decoder uses this estimated CSI, together with the received data sequence, to generate soft decisions for each data symbol. These soft decisions and the known pilot symbols are then filtered again to obtain improved estimation of the CSI. Two different algorithms, algorithm A and algorithm B, have been studied for the iterative filtering process and their performances are evaluated by simulation. At a BER of 10/sup -3/, both algorithms are within 1.3 dB of the ideal system with perfect CSI. Compared to the exponentially growing complexity of the optimal joint channel estimation and decoding system, the proposed system has a linear complexity when algorithm A is used and a polynomial complexity when algorithm B is used, thus providing low-complexity alternatives while maintaining an effective performance improvement.","PeriodicalId":334957,"journal":{"name":"MILCOM 1999. IEEE Military Communications. Conference Proceedings (Cat. No.99CH36341)","volume":"20 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":"131535113","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: 15

Methodology for platform IO vulnerability assessment 平台IO漏洞评估方法

MILCOM 1999. IEEE Military Communications. Conference Proceedings (Cat. No.99CH36341) Pub Date : 1999-10-31 DOI: 10.1109/MILCOM.1999.822728

R.L. zum Brunnen, P. Ciolek, F.T. Beale

{"title":"Methodology for platform IO vulnerability assessment","authors":"R.L. zum Brunnen, P. Ciolek, F.T. Beale","doi":"10.1109/MILCOM.1999.822728","DOIUrl":"https://doi.org/10.1109/MILCOM.1999.822728","url":null,"abstract":"The Survivability/Lethality Analysis Directorate (SLAD), US Army Research Laboratory (ARL) has been tasked with the responsibility to develop a methodology and program for use in the assessment of the vulnerabilities made possible with the internal integration C4I systems on major weapons platforms e.g.: M1A2 Abrams Main Battle Tank, AH-64 Apache Attack Helicopter, etc. The ultimate goal of this program is to develop an integrated methodology and toolset that can be used to identify and assess vulnerabilities of integrated C4I systems. The information operations vulnerability/survivability assessment (IOVSA) is a process of analytical steps, which the SLAD of the ARL applies to networked automated information systems (INFOSYS) of military interest. The goal of SLAD's information system survivability tools, techniques, and methodology (TTM) development program is to generate predictive computer models that predict, as closely as is reasonably possible, the real world observed behavior of specific information processor properties caused by various real world stimuli using an agreed upon set of metrics. These stimuli range from normal network operations to the stressing stimuli caused by various software errors, hardware errors, and the multitude of the different forms of intentional or unintentional misuse and hostile attacks to which an information processor may be subjected.","PeriodicalId":334957,"journal":{"name":"MILCOM 1999. IEEE Military Communications. Conference Proceedings (Cat. No.99CH36341)","volume":"41 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":"132564621","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

MMSE based fully distributed power control algorithm 基于MMSE的全分布式功率控制算法

MILCOM 1999. IEEE Military Communications. Conference Proceedings (Cat. No.99CH36341) Pub Date : 1999-10-31 DOI: 10.1109/MILCOM.1999.822665

A. Almutairi, H. Latchman, T. Wong, S. Miller

引用次数: 3

Development and application of the 188-220 protocol test tool network analyzer (PTTNA) prototype 188-220协议测试工具网络分析仪(PTTNA)原型的开发与应用

MILCOM 1999. IEEE Military Communications. Conference Proceedings (Cat. No.99CH36341) Pub Date : 1999-10-31 DOI: 10.1109/MILCOM.1999.821358

J. Zbozny, J. Keenan, R. Menell, S. Turczyn, C. Lin

引用次数: 1

User-identification on Window environment by using the speech 在windows环境下使用语音进行用户识别

MILCOM 1999. IEEE Military Communications. Conference Proceedings (Cat. No.99CH36341) Pub Date : 1999-10-31 DOI: 10.1109/MILCOM.1999.821446

Jong-Soon Jung, Jaeok Bae, K. Jang, M. Bae

引用次数: 0

Potential use of commercial Ka-band to augment wideband MILSATCOM systems 商用ka波段的潜在用途，以增强宽带军事卫星通信系统

MILCOM 1999. IEEE Military Communications. Conference Proceedings (Cat. No.99CH36341) Pub Date : 1999-10-31 DOI: 10.1109/MILCOM.1999.821448

G.J. Graupmann, C. Usn, K. Ota, J. Isaacson, P. Thomas, K.A. Fiscko

引用次数: 2

Rate adaptive OFDM (RA-OFDM) spread spectrum system for LEO satellite communications 低轨道卫星通信速率自适应OFDM (RA-OFDM)扩频系统

MILCOM 1999. IEEE Military Communications. Conference Proceedings (Cat. No.99CH36341) Pub Date : 1999-10-31 DOI: 10.1109/MILCOM.1999.822758

Zhong Ye, G. Saulnier, M. Medley

{"title":"Rate adaptive OFDM (RA-OFDM) spread spectrum system for LEO satellite communications","authors":"Zhong Ye, G. Saulnier, M. Medley","doi":"10.1109/MILCOM.1999.822758","DOIUrl":"https://doi.org/10.1109/MILCOM.1999.822758","url":null,"abstract":"Wireless communications systems in a tactical environment must be able to function effectively in a channel characterized by multipath fading and interference. Additionally, current and future communications requirements will necessitate the transmission of many different types of information with a wide range of data rates over these wireless links. Rate adaptive signaling is a powerful way to design a robust system across such broad range of channel conditions because the system will not have to be designed for the worst case scenario and system resources can be utilized more efficiently. In this paper, we apply our previously proposed rate adaptive OFDM spread spectrum system concept to a LEO satellite (LEOS) communications application. We demonstrate the feasibility of rate adaptation by analyzing the link margin of a LEOS link characterized by free space loss, multipath fading and interference. A Doppler based rate adaptation algorithm is proposed to constantly measure and predict the mobile terminal received signal strength and to control the system processing gain accordingly. Desired system performance can be maintained across a large dynamic range of signal strength by the proper control of the processing gain.","PeriodicalId":334957,"journal":{"name":"MILCOM 1999. IEEE Military Communications. Conference Proceedings (Cat. No.99CH36341)","volume":"236 S725","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114085119","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

Narrowband jammer suppression in coded DS-CDMA channels 编码DS-CDMA信道中的窄带干扰抑制

MILCOM 1999. IEEE Military Communications. Conference Proceedings (Cat. No.99CH36341) Pub Date : 1999-10-31 DOI: 10.1109/MILCOM.1999.821319

J. Thomas, E. Geraniotis

{"title":"Narrowband jammer suppression in coded DS-CDMA channels","authors":"J. Thomas, E. Geraniotis","doi":"10.1109/MILCOM.1999.821319","DOIUrl":"https://doi.org/10.1109/MILCOM.1999.821319","url":null,"abstract":"Existing narrowband jammer suppressors for DS-CDMA, typically function independently of the multiuser interference cancellation strategy used. Besides, certain high-performance jammer suppression techniques, e.g., linear MMSE suppression, assume that the powers and frequencies of the interfering signals are known, or that they can be adaptively estimated. The former is never true in practice and the latter is not feasible when long spreading codes are used. The present work eliminates these restrictions, by applying the idea of iterative MMSE multiuser interference suppression, introduced earlier by the authors, to this context. The first iteration in this procedure is effectively MMSE multiuser interference cancellation; the parameters of the jammers are unknown at this stage. The outputs of all users' soft decoders (applied to the demodulator outputs of this iteration) are then fed back to subtract their (estimated) cumulative contribution from the received signal vector; the residue comprises the narrowband jammers embedded in wideband noise, so that the former can be piecewise interpolated over chip intervals of appropriate duration, and thence subtracted from the received signal for the succeeding iteration. The soft-decoded feedback estimates of the interfering signals are also used in each iteration to perform soft MMSE multiuser interference suppression, in conjunction with subtractive interference cancellation. The approach is extended to exploit the enhanced separation (in the spatial sense) that is afforded by employing multisensor receivers.","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":"114598596","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: 8