IEEE Military Communications Conference, 2003. MILCOM 2003.最新文献

{"title":"A steady state decoupled Kalman filter technique for multiuser detection","authors":"Brian P. Flanagan, James Dunyak","doi":"10.1109/MILCOM.2003.1290127","DOIUrl":"https://doi.org/10.1109/MILCOM.2003.1290127","url":null,"abstract":"In this paper, we describe a Kalman filter based technique for multiuser detection of asynchronous CDMA systems. Similar to previously proposed techniques, we use a decoupled form of the Kalman filter, which processes each user independently. We then make the further simplifying assumption that the channel statistics are constant over a single symbol allowing us to reduce the Kalman gain to a constant dependent on the current signal to interference plus noise ratio. We study the performance of the constant gain filter and show that by appropriate choice of the gain you can optimize for either minimum bit error rate or maximum interference reduction.","PeriodicalId":435910,"journal":{"name":"IEEE Military Communications Conference, 2003. MILCOM 2003.","volume":"83 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-10-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125421023","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}

{"title":"Modeling and simulation of optical networks using a virtual GMPLS-based optical switching router","authors":"Ralph Martinez, Kevin M. McNeill, Wenji Wu, P. Y. Choo","doi":"10.1109/MILCOM.2003.1290117","DOIUrl":"https://doi.org/10.1109/MILCOM.2003.1290117","url":null,"abstract":"This paper discusses the design and implementation of a simulation-based virtual optical switching router (VOSR). We built our VOSR model using the OPNET/spl trade/ process models that represent the GMPLS control plane functions. The GMPLS virtual model interfaces with a forwarding plane virtual model that represents the optical switching router in an optical core network. The VOSR model gives an integrated and realistic simulation of wavelength routing, wavelength assignment, wavelength switching, dynamic label switching path (LSP) setup and tear-down, distributed routing table calculation, and blocking mechanisms light paths. The VOSR models and simulations provide a framework for the analysis and evaluation of various wavelength routing and assignment algorithms. The basic VOSR model can be used to evaluate performance of optical network core models with hundreds of optical switching nodes. The forwarding plane model can be varied and includes different types of switching fabrics. The VOSR model can be set to represent internal optical switching routers, similar to label switched router (LSRs) in an electrical network world, except they switch wavelengths not labels. The VOSR model also represents label edge routers (LERs) that drop or add wavelengths to and from electrical edge networks, such as a GigE, ATM, or SONET. Our simulation results include the blocking rate, OSPF-TE bandwidth analysis, CPU utilization, which is highly comparable to a real GMPLS optical network. As the requirements for terahertz reach back emerges in DoD systems, the VOSR models and simulation environment can be applied to analysis and evaluation of optical core networks, such as carrier networks, gigabit expansion project, the global information grid (GIG), exploratory C5 grid (EC5G) core networks, and emerging enterprise and Internet backbones. In addition, research is being conducted that applies these concepts to interconnected islands of transparency with optical and wireless domains [R. Martinez et al., June 23-26 2003]. The U. S. Army Information Systems Engineering Command, Technology Integration Center (TIC) at Fort Huachuca, AZ, sponsored this research.","PeriodicalId":435910,"journal":{"name":"IEEE Military Communications Conference, 2003. MILCOM 2003.","volume":"93 5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-10-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125974682","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}

{"title":"A multibanded system architecture for ultra-wideband communications","authors":"J. R. Foerster, V. Somayazulu, Subhasish Subhasish","doi":"10.1109/MILCOM.2003.1290243","DOIUrl":"https://doi.org/10.1109/MILCOM.2003.1290243","url":null,"abstract":"The FCC ruling in 2002 allowing for the unlicensed deployment of ultra-wideband (UWB) devices for communications purposes in the 3.1-10.6 GHz band has sparked great interest in the industry. In particular, the IEEE 802.15.3a task group is currently developing a standard for high-rate, short-range wireless communication systems that is expected to use UWB technology. One of the main challenges for UWB system design is minimizing the possible interference to other narrowband systems, while, at the same time, dealing with the large interference that may be coming from these narrowband systems into the UWB receiver. Traditional UWB systems have used very short time impulses that occupy several giga-hertz of bandwidth. This approach makes it difficult to efficiently avoid other system that may be sharing the same band. This paper will describe a channel model that has been adopted by the industry to evaluate the merits of different UWB physical layer approaches and introduce an alternate approach to a high-rate UWB system that is based upon the concatenation of multiple narrower band UWB waveforms.","PeriodicalId":435910,"journal":{"name":"IEEE Military Communications Conference, 2003. MILCOM 2003.","volume":"155 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-10-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127349714","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}

{"title":"Low-rank Wiener filtering for asynchronous DS-CDMA systems with adaptive antenna arrays","authors":"Chia-Chang Hu, I. Reed, Xiaoli Yu","doi":"10.1109/MILCOM.2003.1290130","DOIUrl":"https://doi.org/10.1109/MILCOM.2003.1290130","url":null,"abstract":"In this paper, a novel space-time adaptive near-far robust array receiver for asynchronous DS-CDMA systems is developed without the need for prior synchronization. There are the same basic requirements that are needed by the conventional receiver of an asynchronous DS-CDMA system. To implement in real-time systems a computationally efficient version of the proposed receiver is developed that is based on the concept of the multistage Wiener filter (MWF) of Goldstein and Reed. This multistage technique results in a self-synchronizing detection criterion that requires no inversion or eigendecomposition of a covariance matrix. As a consequence this receiver achieves a complexity that is only a linear function of the size of antenna array (J), the rank of the MWF (M), the system processing gain (N), and the number of samples in a chip interval (S), i.e., O(JMNS). The complexity of the equivalent receiver based on the minimum mean-squared error (MMSE) criterion is a function of O(( JNS)/sup 3/). Moreover, this multistage scheme has a rapid adaptive convergence under limited observation-data support. Simulations are conducted to evaluate the convergence behavior of the proposed receiver with the different amount of sample support and the various rank of the MWF. The performance advantage of the proposed detector over other DS-CDMA receivers is investigated.","PeriodicalId":435910,"journal":{"name":"IEEE Military Communications Conference, 2003. MILCOM 2003.","volume":"45 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-10-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124435084","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}

{"title":"Optimal tree structure for key management of simultaneous join/leave in secure multicast","authors":"F. Zhu, Anthony K. C. Chan, G. Noubir","doi":"10.1109/MILCOM.2003.1290210","DOIUrl":"https://doi.org/10.1109/MILCOM.2003.1290210","url":null,"abstract":"As applications of secure multicast in networks continue to grow, the demand for an efficient scheme to manage group keys for secure group communication becomes more urgent. In this paper, we propose a new key tree structure for group key management. With this optimal tree structure, system resources such as network bandwidth can be saved. We devise an algorithm to generate this optimal tree and show that it can be implemented efficiently. We also design an adaptive system for group key management which consists of four components: a request receiver, a key tree update controller, a delay calculator and a request predictor. This system can maintain the optimality of the key tree dynamically. It is verified by theoretical analysis and simulation result that the performance of our scheme is better than other schemes based on traditional tree structures.","PeriodicalId":435910,"journal":{"name":"IEEE Military Communications Conference, 2003. MILCOM 2003.","volume":"71 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-10-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121673044","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}

{"title":"UHF and EHF implementation at Teleports","authors":"G. Parikh, T. Fritz, M. Cross, P. Locklar, D. Chase, A. Heaberlin, C. Pitts, W. Leonard, B. Hamilton","doi":"10.1109/MILCOM.2003.1290153","DOIUrl":"https://doi.org/10.1109/MILCOM.2003.1290153","url":null,"abstract":"The Department of Defense (DoD) Teleport program offers advanced reach-back capabilities for the deployed warfighter, enabling them to use a wide variety of satellite capabilities including enhanced functionality in Ku, C, X, UHF, EHF, KA, HF bands, and legacy C4I. The Teleports are built upon the existing STEP sites, which currently provide wideband, X-band capability over the DSCS satellite constellation. The narrowband, ultra high frequency (UHF) capabilities include the use of ViaSat RT-1828 terminals with NIPRNET and SIPRNET capabilities. For protected communications at extremely high frequency (EHF), three Navy EHF SATCOM Program (NESP) follow-on terminals (FOT) are planned for installation at six Teleport sites and one support site during Generation Two. Additionally, the system can provide cross-banding capabilities from the UHF and EHF terminals to wideband users. This paper provides an overview of the utilization of UHF and EHF technology in the DoD Teleport system.","PeriodicalId":435910,"journal":{"name":"IEEE Military Communications Conference, 2003. MILCOM 2003.","volume":"427 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-10-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122132377","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}

{"title":"MH-TRACE: multihop time reservation using adaptive control for energy efficiency","authors":"B. Tavlı, W. Heinzelman","doi":"10.1109/MILCOM.2003.1290413","DOIUrl":"https://doi.org/10.1109/MILCOM.2003.1290413","url":null,"abstract":"Multihop time reservation using adaptive control for energy efficiency (MH-TRACE) is a distributed MAC protocol for energy efficient real-time packet broadcasting in a multihop radio network. In MH-TRACE, the network is dynamically partitioned into clusters without using any global information except global clock synchronization. The clustering algorithm is simple and robust enough to ensure that the gain from clustering is much higher than the clustering overhead, even in the presence of node mobility. In MH-TRACE, time is organized into superframes, which consist of several time frames. Each cluster chooses a frame for transmitting control packets and for the transmission of data from nodes in the cluster. However, each node in the network can receive all the desired packets in its receive range without any restriction based on the formed clusters. Each node learns about future data transmissions in its receive range from information summarization (IS) packets sent prior to data transmission by each transmitting node. Therefore, each node creates its own listening cluster and receives the packets it wants. By avoiding energy dissipation for receiving unwanted data packets or for waiting in idle mode, MH-TRACE guarantees the network to be highly energy efficient. Furthermore, since data transmission is contention free, the throughput of MH-TRACE is better than the throughput of CSMA type protocols under high traffic loads.","PeriodicalId":435910,"journal":{"name":"IEEE Military Communications Conference, 2003. MILCOM 2003.","volume":"98 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-10-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125539276","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}

{"title":"Performance optimization for a mobile small-unit-operation situational awareness (SUO-SAS) radio network","authors":"Y.J. Liu, C. Li, C. Cruz","doi":"10.1109/MILCOM.2003.1290101","DOIUrl":"https://doi.org/10.1109/MILCOM.2003.1290101","url":null,"abstract":"This paper concerns performance optimization using the Taguchi parameter optimization methodology[M.S. Phaadke, May 12 1989] in a network based on SUO-SAS (situational awareness system for small unit operations)-a new state-of-the-art communication system developed by ITT Industries. For the subject experiment, the network consisted of 20 nodes. The nodes are mobile and move in accordance with an operationally relevant scenario based upon a topology provided by DARPA. The scenario specifies the input traffic variations and other noise factors such as message size, message types and mobility. The throughput is the most important performance metric and is selected as the output characteristic. The criterion for throughput optimization amounts to generating as large a throughput as possible. Four crucial parameters associated with the intranet layer and link layer, and an L/sub 9/ orthogonal array are selected for optimization through OPNET modeling and simulation. Parameter optimization yields a 34% improvement in message completion rate and a 35% improvement in system throughput.","PeriodicalId":435910,"journal":{"name":"IEEE Military Communications Conference, 2003. MILCOM 2003.","volume":"02 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-10-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128352602","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}

{"title":"ESV algorithm for suppression of multiple-access interference in frequency-hopping networks","authors":"D. Torrieri, K. Bakhru","doi":"10.1109/MILCOM.2003.1290424","DOIUrl":"https://doi.org/10.1109/MILCOM.2003.1290424","url":null,"abstract":"The maximin algorithm is a blind adaptive-array algorithm that provides simultaneous interference suppression and beamforming in a frequency-hopping communication system. Against frequency-hopping multiple-access interference, however, it is found that the maximin array relies exclusively on its beamforming to limit its susceptibility to the narrowband, time-varying interference. The estimated steering vector (ESV) algorithm is a new algorithm that provides superior beamforming. The performance advantage of the ESV array relative to the maximin array becomes increasingly significant as the hop duration decreases.","PeriodicalId":435910,"journal":{"name":"IEEE Military Communications Conference, 2003. MILCOM 2003.","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-10-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129482004","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}

{"title":"Small unit operations situation awareness system (SUO SAS): an overview","authors":"L. Williams","doi":"10.1109/MILCOM.2003.1290098","DOIUrl":"https://doi.org/10.1109/MILCOM.2003.1290098","url":null,"abstract":"The SUO SAS system, sponsored by DARPA, developed critical technology components essential to a new way of fighting by dismounted forces. Technology breakthroughs in extremely agile radio systems, advanced large scale ad hoc networking, position location without GPS and distributed collaborative situation awareness have revealed the future potential of putting the power of computing and communications in the hands of every soldier. As many of these technologies transition to the US Army, they ultimately advance individual warrior understanding, lethality and reliability.","PeriodicalId":435910,"journal":{"name":"IEEE Military Communications Conference, 2003. MILCOM 2003.","volume":"37 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-10-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130896993","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}