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MILCOM 2007 - IEEE Military Communications Conference最新文献

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Frequency Estimation of Uncooperative Coherent Pulse Radars 非合作相干脉冲雷达的频率估计
MILCOM 2007 - IEEE Military Communications Conference Pub Date : 2007-10-01 DOI: 10.1109/MILCOM.2007.4454982
J. Gai, François Chan, Y. Chan, Huai-Jing Du, F. Dilkes
{"title":"Frequency Estimation of Uncooperative Coherent Pulse Radars","authors":"J. Gai, François Chan, Y. Chan, Huai-Jing Du, F. Dilkes","doi":"10.1109/MILCOM.2007.4454982","DOIUrl":"https://doi.org/10.1109/MILCOM.2007.4454982","url":null,"abstract":"RF Frequency estimation is required in many applications, such as Radar Electronic Warfare (REW) and telecommunications. For example, passive location estimation of uncooperative radar sites in a target area is an important military application and can be achieved by measuring the Doppler-shifted frequencies of trains of modulated pulses received by an Electronic Support Measure (ESM) receiver on-board of a moving platform such as an aircraft or Unmanned Aerial Vehicle (UAV). The accuracy of the location technique depends on the accuracy of Doppler frequency measurements. There are several techniques that can be used to estimate accurately the frequency of continuous wave signals. However, estimating the frequency of trains of modulated pulses is more challenging because the pulse durations are very short. Furthermore, the computational complexity required for accurate estimation may become impractical if the Pulse Repetition Frequency (PRF) becomes small. In this paper, an FFT-based approach is considered. Techniques to improve the frequency step size, such as the Zoom FFT technique and the secant method, will be presented. Simulation results show that the frequency estimation approaches presented here can closely approach the Cramer-Rao Lower Bound (CRLB) in most cases.","PeriodicalId":135777,"journal":{"name":"MILCOM 2007 - IEEE Military Communications Conference","volume":"144 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116433324","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: 12
Interdomain Routing for Mobile Nodes 移动节点的域间路由
MILCOM 2007 - IEEE Military Communications Conference Pub Date : 2007-10-01 DOI: 10.1109/MILCOM.2007.4455107
Katie Schroth, D. Kiwior
{"title":"Interdomain Routing for Mobile Nodes","authors":"Katie Schroth, D. Kiwior","doi":"10.1109/MILCOM.2007.4455107","DOIUrl":"https://doi.org/10.1109/MILCOM.2007.4455107","url":null,"abstract":"In this paper, we investigate the issues related to the use of a BGP (Border Gateway Protocol) backbone to provide connectivity between mobile nodes, with a specific focus on nodes within an airborne network domain. Research efforts have developed multiple MANET (Mobile Ad hoc Network) protocols to provide routing for mobile nodes. In an airborne network environment, however, there may not be a dense enough concentration of nodes within radio range to provide the connectivity needed for effective use of a MANET protocol. In addition, aircraft within radio range of other nodes will experience intermittent and varying quality radio signals due to banking, interference, or Doppler effects. BGP is the de facto standard in use today to provide terrestrial internetworking routing among Autonomous Systems (AS) despite well known problems. BGP configuration can be complex and has convergence issues but the BGP capability to handle large numbers of routes makes it invaluable. In addition to its use in terrestrial internetworking, BGP has been identified as the routing protocol for the Transformational Satellite Communications System (TSAT) Network. Given the BGP networks in a satellite network above and a terrestrial network below an airborne network, it is important to understand the issues of connecting via BGP for airborne nodes. This paper summarizes the results of lab experiments evaluating use of a BGP network for an alternate routing path between aircraft when there is no other connectivity within their airborne routing domain.","PeriodicalId":135777,"journal":{"name":"MILCOM 2007 - IEEE Military Communications Conference","volume":"32 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116471855","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
Italian next generation MilSatCom: the Sicral 2 SHF Payload 意大利下一代军事卫星通信:Sicral 2 SHF有效载荷
MILCOM 2007 - IEEE Military Communications Conference Pub Date : 2007-10-01 DOI: 10.1109/MILCOM.2007.4455254
A. Le Pera, A. Pisano, G. Di Paolo
{"title":"Italian next generation MilSatCom: the Sicral 2 SHF Payload","authors":"A. Le Pera, A. Pisano, G. Di Paolo","doi":"10.1109/MILCOM.2007.4455254","DOIUrl":"https://doi.org/10.1109/MILCOM.2007.4455254","url":null,"abstract":"Within the frame of the Sicral 2 Proposal for the next generation Italian MilSatCom, an innovative and advanced SHF Communication Payload has been designed, able to permit flexible SHF transparent Communication in both Space, Frequency and Power. This is obtained by embarking a Multi-Spot beam Antenna, a Digital Channeling Processor and an MPA HPA section. The interaction of all these three elements does permit to increase the flexibility of the outstanding SHF Communication System, based on existing Sicral 1 and Sicral 1b ground equipments.","PeriodicalId":135777,"journal":{"name":"MILCOM 2007 - IEEE Military Communications Conference","volume":"188 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123617300","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
Connecting Communications Waveforms for Combat Effectiveness 连接通信波形提高战斗力
MILCOM 2007 - IEEE Military Communications Conference Pub Date : 2007-10-01 DOI: 10.1109/MILCOM.2007.4455209
S. Dastangoo, Steven A. Davidson, T. Macdonald
{"title":"Connecting Communications Waveforms for Combat Effectiveness","authors":"S. Dastangoo, Steven A. Davidson, T. Macdonald","doi":"10.1109/MILCOM.2007.4455209","DOIUrl":"https://doi.org/10.1109/MILCOM.2007.4455209","url":null,"abstract":"Future networks, and in particular military networks, will connect numerous types of homogeneous networks, where a homogeneous network is one that uses the same communications waveform and algorithms to inter-connect all the users of the network. There are a number of challenges in inter-networking disparate waveforms including interacting with a network that does not behave in the same manner as your home network. Examples of such features are described and quantified in this paper and two architectures for connecting heterogeneous waveforms are considered. The goal of this paper is to describe the impact, interfaces, and options for inter-connecting different waveforms.","PeriodicalId":135777,"journal":{"name":"MILCOM 2007 - IEEE Military Communications Conference","volume":"291 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121898548","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
A Scalable Hardware Architecture to Support Applications of the HAIPE 3.1 Standard 支持HAIPE 3.1标准应用的可扩展硬件体系结构
MILCOM 2007 - IEEE Military Communications Conference Pub Date : 2007-10-01 DOI: 10.1109/MILCOM.2007.4455148
Brian C. Boorman, C. Mackey, M. Kurdziel
{"title":"A Scalable Hardware Architecture to Support Applications of the HAIPE 3.1 Standard","authors":"Brian C. Boorman, C. Mackey, M. Kurdziel","doi":"10.1109/MILCOM.2007.4455148","DOIUrl":"https://doi.org/10.1109/MILCOM.2007.4455148","url":null,"abstract":"Developers are actively pursuing embedments of the new HAIPE 3.1 standard for secure IP communications. Depending on underlying channel capacities or other aspects of individual applications, different levels of performance may be required. The challenge is to provide a hardware platform that provides the required level of computational support, but optimized with respect to cost, size, weight, etc. This paper will present an overview of these challenges and will describe an innovative, scalable hardware architecture that addresses them. Performance data was gathered for a series of architecture configuration experiments. Performance data is presented along with discussion and recommendations for future work.","PeriodicalId":135777,"journal":{"name":"MILCOM 2007 - IEEE Military Communications Conference","volume":"248 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117187052","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
Scalable Urban Network Simulation (SUNS) 可扩展城市网络模拟(太阳)
MILCOM 2007 - IEEE Military Communications Conference Pub Date : 2007-10-01 DOI: 10.1109/MILCOM.2007.4455098
David L. Rhodes, B. Epstein, B. Perlman
{"title":"Scalable Urban Network Simulation (SUNS)","authors":"David L. Rhodes, B. Epstein, B. Perlman","doi":"10.1109/MILCOM.2007.4455098","DOIUrl":"https://doi.org/10.1109/MILCOM.2007.4455098","url":null,"abstract":"A clear and accurate understanding of communication network performance is essential, especially where all layers of the protocol stack - from physical propagation to application transport protocols - must be accounted for. While some solutions exist for RF communications over `open-terrain' areas, the urban environment is particularly challenging. To meet this challenge, a server-based, real-time solution for assessing complex communication and network effects in urban environments has been developed. By combining advanced RF ray-tracing propagation modeling and a full network simulator, the Scalable Urban Network Simulation (SUNS) software is able to provide accurate communications effects services. SUNS supports tactical modeling and simulation by predicting electro-magnetic signal coverage and path loss through application of a full 3D physical knowledge of the urban environment and terrain features. The commercial OPNET network simulator is used as the core of the system, with SUNS operations supported through a custom OPNET model that functions as a modeling and simulation server. The server, in turn, communicates with other node models within the OPNET simulation. In the approach, urban propagation data are pre-computed using high-performance computing (HPC) resources utilizing ray traced models of the urban scene.","PeriodicalId":135777,"journal":{"name":"MILCOM 2007 - IEEE Military Communications Conference","volume":"41 13","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120852545","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
Feature Suppression for Physical-layer Security in OFDM Systems OFDM系统物理层安全的特征抑制
MILCOM 2007 - IEEE Military Communications Conference Pub Date : 2007-10-01 DOI: 10.1109/MILCOM.2007.4455033
T. Yucek, H. Arslan
{"title":"Feature Suppression for Physical-layer Security in OFDM Systems","authors":"T. Yucek, H. Arslan","doi":"10.1109/MILCOM.2007.4455033","DOIUrl":"https://doi.org/10.1109/MILCOM.2007.4455033","url":null,"abstract":"OFDM symbols carry redundancy due to the cyclic extension employed for providing immunity to multipath distortion. This redundancy can be used for blindly detecting the transmission parameters as well as achieving synchronization to transmitted signal. This paper proposes transmission-level techniques for suppressing physical-layer features of OFDM waveform. Hence, a covert, secure and reliable transmission based on OFDM technique can be achieved. We analyze the effectiveness of the proposed methods by investigating the cyclic autocorrelation function (CAF) of the OFDM waveforms.","PeriodicalId":135777,"journal":{"name":"MILCOM 2007 - IEEE Military Communications Conference","volume":"34 12","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120861585","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: 17
Coherent and Multi-symbol Noncoherent CPFSK: Capacity and Code Design 相干和多符号非相干CPFSK:容量和代码设计
MILCOM 2007 - IEEE Military Communications Conference Pub Date : 2007-10-01 DOI: 10.1109/MILCOM.2007.4454912
S. Cheng, M. Valenti, D. Torrieri
{"title":"Coherent and Multi-symbol Noncoherent CPFSK: Capacity and Code Design","authors":"S. Cheng, M. Valenti, D. Torrieri","doi":"10.1109/MILCOM.2007.4454912","DOIUrl":"https://doi.org/10.1109/MILCOM.2007.4454912","url":null,"abstract":"The capacity of coded continuous-phase frequency-shift keying (CPFSK) is found for additive white Gaussian noise (AWGN) channels under the assumption that the symbols at the modulator input are independent and uniformly distributed. Two forms of reception are considered, coherent detection and multi-symbol noncoherent block detection. Calculating the coherent capacity of CPFSK is facilitated by considering the system as a finite-state Markov channel. A methodology is proposed for designing systems that approach the capacity by using an irregular repeat-accumulate (IRA) code. The code is optimized directly from the system's EXIT chart by using linear programming to determine the optimal variable-node degree distribution. Results are presented for a rate 1/2 MSK system that is within 0.43 dB and 0.33 dB of the coherent and 4-symbol noncoherent capacities, respectively.","PeriodicalId":135777,"journal":{"name":"MILCOM 2007 - IEEE Military Communications Conference","volume":"107 12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123938077","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
Secondary User Cooperation Access Scheme in Opportunistic Cognitive Radio Networks 机会认知无线网络中的二次用户合作接入方案
MILCOM 2007 - IEEE Military Communications Conference Pub Date : 2007-10-01 DOI: 10.1109/MILCOM.2007.4455277
Zhiyao Ma, Z. Cao
{"title":"Secondary User Cooperation Access Scheme in Opportunistic Cognitive Radio Networks","authors":"Zhiyao Ma, Z. Cao","doi":"10.1109/MILCOM.2007.4455277","DOIUrl":"https://doi.org/10.1109/MILCOM.2007.4455277","url":null,"abstract":"Opportunistic spectrum access of multiple secondary users is discussed in this paper. The general periodic sensing method leads to a low throughput. An efficient cooperation scheme in distributed Cognitive Radio networks is presented. The secondary user access model uses advantages of instant access opportunities. Since a Secondary User (SU) senses and transmits alternately, two SUs can work in pair to make up a cooperation group and share spectrum bands through data transmission in turn. The best and worst cooperation situations are analyzed. Theoretical results of the throughput are given, supported by simulation results. Throughputs of both members in the cooperation group are improved.","PeriodicalId":135777,"journal":{"name":"MILCOM 2007 - IEEE Military Communications Conference","volume":"20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123947782","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
Comparative Study of SVD and QRS in Closed-Loop Beamforming Systems 闭环波束形成系统中SVD与QRS的比较研究
MILCOM 2007 - IEEE Military Communications Conference Pub Date : 2007-10-01 DOI: 10.1109/MILCOM.2007.4454792
C. Yuen, Sumei Sun, Jian-Kang Zhang
{"title":"Comparative Study of SVD and QRS in Closed-Loop Beamforming Systems","authors":"C. Yuen, Sumei Sun, Jian-Kang Zhang","doi":"10.1109/MILCOM.2007.4454792","DOIUrl":"https://doi.org/10.1109/MILCOM.2007.4454792","url":null,"abstract":"We compare two closed-loop beamforming algorithms, one based on singular value decomposition (SVD) and the other based on equal diagonal QR decomposition (QRS). SVD has the advantage of parallelizing the MIMO channel, but each of the sub-channels has different gain. QRS has the advantage of having equal diagonal value for the decomposed channel, but the subchannels are not fully parallelized, hence requiring successive interference cancellation or other techniques to perform decoding. We consider a closed-loop system where the feedback information is a unitary beamforming matrix. Due to the discrete and limited modulation set, SVD may have inferior performance to QRS when no modulation set selection is performed. However, if the selection of modulation set is performed optimally, we show that SVD can outperform QRS.","PeriodicalId":135777,"journal":{"name":"MILCOM 2007 - IEEE Military Communications Conference","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123981873","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: 7
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