N. Reingand, I. Shpantzer, Y. Achiam, A. Kaplan, A. Greenblatt, G. Harston, P. Cho
{"title":"Novel design for the broadband linearized optical intensity modulator","authors":"N. Reingand, I. Shpantzer, Y. Achiam, A. Kaplan, A. Greenblatt, G. Harston, P. Cho","doi":"10.1109/MILCOM.2003.1290371","DOIUrl":"https://doi.org/10.1109/MILCOM.2003.1290371","url":null,"abstract":"The field of microwave photonics in which the radio-frequency signal is transmitted using an optical link has been experiencing rapid growth in the last decade. There is a demand for compact, robust and inexpensive devices capable of achieving high fidelity analog transmission between two remote locations. Analog transmission possesses an inherent advantage of being transparent to various modulation formats in many bands. Many applications require large dynamic range (over 130 dB/Hz) and large (few GHz) bandwidth. In such applications the element limiting the performance turns out to be the optical intensity modulator. The typical intensity modulator based on the Mach-Zehnder interferometer (MZI) has a nonlinear response and thus exhibits strong third-order intermodulation distortion limiting the dynamic range. Numerous suggestions for linearization of the MZI response have not become practical due to their complexity of design. We propose a novel, exceptionally simple way of linearization of the intensity modulator response based on combining a MZI and a low-Q off-resonant Gires-Tornois interferometer (GTI) in one integrated package. In this design the third-order intermodulation distortion can be completely cancelled raising the spur-free dynamic range to 130 dB in 1 Hz bandwidth. At the same time, due to the low Q of the GTI a bandwidth in excess of 3 GHz can be attained anywhere in a 0-45 GHz range.","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":"130153009","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":"On the use of directional antennas for sensor networks","authors":"C. Santivanez, J. Redi","doi":"10.1109/MILCOM.2003.1290184","DOIUrl":"https://doi.org/10.1109/MILCOM.2003.1290184","url":null,"abstract":"Directional antennas have been shown to have the potential to provide dramatic increases in throughput and reduction in delay, while simultaneously requiring lower transmit power and increasing LPI/LPD and A/J qualities. Among military systems, sensor systems have a strong need for such characteristics due to their inability to move, length of deployment time, as well as a need for stealth operation. In this paper we describe and analyze significant issues for contention-based MACs for directional antennas which are of particular interest to sensor systems. We also provide a MAC design that overcomes these difficulties.","PeriodicalId":435910,"journal":{"name":"IEEE Military Communications Conference, 2003. MILCOM 2003.","volume":"119 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":"130437603","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":"Generic protocol for network management data collection and dissemination","authors":"C. Chiang, A. Mcauley, D. Chee, L. Wong","doi":"10.1109/MILCOM.2003.1290292","DOIUrl":"https://doi.org/10.1109/MILCOM.2003.1290292","url":null,"abstract":"YAP is a protocol designed to efficiently and robustly relay network configuration states of nodes to a designated node that collects and stores the configuration states of all the nodes. Once the configuration states from the nodes are collected, any application can query the information to perform its own specific function. For example, a GUI application can query the database to display the logical topology of the networks. Also a Configuration Manager can query the database to decide how to reconfigure the network. We describe how YAP was integrated with protocols designed to auto-configure IP-related attributes of nodes (using DRCP and DCDP).","PeriodicalId":435910,"journal":{"name":"IEEE Military Communications Conference, 2003. MILCOM 2003.","volume":"501 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":"134353665","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":"OMG data distribution service: architectural overview","authors":"G. Pardo-Castellote","doi":"10.1109/MILCOM.2003.1290110","DOIUrl":"https://doi.org/10.1109/MILCOM.2003.1290110","url":null,"abstract":"The OMG data-distribution service (DDS) is an emerging specification for publish-subscribe data-distribution systems. The purpose of the specification is to provide a common application-level interface that clearly defines the data-distribution service. The specification describes the service using UML, thus providing a platform-independent model that can then be mapped into a variety of concrete platforms and programming languages. The OMG DDS attempts to unify the common practice of several existing implementations [(M. Boasson et al., July 1993), (Pardo-Castellote et al., 1999] enumerating and providing formal definitions for the QoS (quality of service) settings used to configure the service. This paper introduces the OMG DDS specification, and describes the main aspects of the model.","PeriodicalId":435910,"journal":{"name":"IEEE Military Communications Conference, 2003. MILCOM 2003.","volume":"16 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":"132674029","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}
Jung-Tae Kim, Sung-Hoon Moon, J. Jo, D. Han, Myeong-Je Cho
{"title":"Fast DOA estimation algorithm for improving performance of SPT-LCMV beamformer","authors":"Jung-Tae Kim, Sung-Hoon Moon, J. Jo, D. Han, Myeong-Je Cho","doi":"10.1109/MILCOM.2003.1290426","DOIUrl":"https://doi.org/10.1109/MILCOM.2003.1290426","url":null,"abstract":"To eliminate coherent interferences, a conventional split polarity transformation-linearly constrained minimum variance (SPT-LCMV) beamformer uses the SPT matrix to remove any correlation between the desired signal and coherent interferences. After removing the correlation, an LCMV beamforming is applied to obtain the desired signal. However, it needs to estimate direction of arrivals (DOAs) for all coherent interferences. Conventional algorithms to estimate the DOAs of coherent interferences are computationally complexity. Moreover, the performance of the SPT-LCMV beamformer degraded severely as the estimated DOA errors increased. Accordingly, high-order constraints are required to compensate the DOA estimation errors. As a result, the SPT-LCMV beamformer needs many array elements in proportion to the number of the constraints applied to generate the SPT matrix. This paper proposes a DOA estimation algorithm to overcome the disadvantages of the SPT-LCMV beamformer. The proposed algorithm has a significantly reduced computational complexity and can also reduce the number of the high-order constraints compared to the conventional DOA estimation algorithms.","PeriodicalId":435910,"journal":{"name":"IEEE Military Communications Conference, 2003. MILCOM 2003.","volume":"13 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":"131288296","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 of UWB communications with imperfect channel estimation","authors":"J.D. Choi, W. Stark","doi":"10.1109/MILCOM.2003.1290276","DOIUrl":"https://doi.org/10.1109/MILCOM.2003.1290276","url":null,"abstract":"In this paper, we examine the performance of diversity combining with imperfect channel estimation when the channel is comprised of diffuse as well as specular, or nonfading, components. It is shown that the presence of specular components under certain conditions can reduce the combining loss incurred by large-bandwidth systems when employing imperfect channel estimates and combining a significant number of resolvable paths.","PeriodicalId":435910,"journal":{"name":"IEEE Military Communications Conference, 2003. MILCOM 2003.","volume":"34 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":"127394190","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}
C. Jones, A. Matache, T. Tian, J. Villasenor, R. Wesel
{"title":"The universality of LDPC codes on wireless channels","authors":"C. Jones, A. Matache, T. Tian, J. Villasenor, R. Wesel","doi":"10.1109/MILCOM.2003.1290143","DOIUrl":"https://doi.org/10.1109/MILCOM.2003.1290143","url":null,"abstract":"Root and Variaya proved the existence of codes that can communicate reliably over any linear Gaussian channel for which the mutual information exceeds the information rate of the code. In this paper we demonstrate that properly designed low-density parity-check (LDPC) codes are such codes and that their performance lies in close proximity to the Root and Variaya capacity for the linear Gaussian vector channels (a.k.a. space-time channels). We also demonstrate the robustness of the codes on the partial-band jamming channel and in fast Rayleigh fading.","PeriodicalId":435910,"journal":{"name":"IEEE Military Communications Conference, 2003. MILCOM 2003.","volume":"32 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":"115616668","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":"On the effect of traffic models to the performance of ad hoc network","authors":"J. Prokkola, L. Leppanen, T. Braysy","doi":"10.1109/MILCOM.2003.1290140","DOIUrl":"https://doi.org/10.1109/MILCOM.2003.1290140","url":null,"abstract":"Ad hoc networks have been proposed as a topology for future tactical networks. The performance of ad hoc networks and especially ad hoc routing protocols has been studied widely. In most cases, the performance is studied with respect to mobility and network size. In this study, we will concentrate on the effect of traffic models under different traffic loads to the performance of ad hoc routed networks. In this paper we use AODV routing protocol over IEEE 802.11b MAC-layer. Research is carried out by simulations with Opnet 8.1 network simulator. Data traffic is usually bursty, which causes serious congestions. Throughput is collapsed due to large number of collisions. Another problem is increased transmission delays. These problems can be crucial especially in tactical networks. Our simulations show that the nature of multi-hop communication causes these problems to be multiplied in an ad hoc environment where significant loss of performance is observed.","PeriodicalId":435910,"journal":{"name":"IEEE Military Communications Conference, 2003. MILCOM 2003.","volume":"14 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":"124138476","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":"Investigation of error control properties of orthogonal codes","authors":"S. Faruque","doi":"10.1109/MILCOM.2003.1290213","DOIUrl":"https://doi.org/10.1109/MILCOM.2003.1290213","url":null,"abstract":"In this paper we investigate the distance properties of orthogonal codes and evaluate its error control properties. We examine this by noting that an n-bit orthogonal code has n/2 1's and n/2 0's; i.e., there are n/2 positions where 1's and 0's differ. Therefore, the distance between two orthogonal codes is also n/2. By exploiting this distance property, we show that a code rate r=k/n, where n is the code length and k is the data length, is available out of orthogonal codes with error control capabilities. We then develop a method of coded modulation with bandwidth efficiency. The proposed technique offers a simpler solution to error control coding with bandwidth efficiency. Finally, the construction of an orthogonal coded modulation scheme is presented to illustrate the concept.","PeriodicalId":435910,"journal":{"name":"IEEE Military Communications Conference, 2003. MILCOM 2003.","volume":"74 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":"114847504","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":"Cryptol: high assurance, retargetable crypto development and validation","authors":"Jeffrey R. Lewis, Galois","doi":"10.1109/MILCOM.2003.1290218","DOIUrl":"https://doi.org/10.1109/MILCOM.2003.1290218","url":null,"abstract":"As cryptography becomes more vital to the infrastructure of computing systems, it becomes increasingly vital to be able to rapidly and correctly produce new implementations of cryptographic algorithms. To address these challenges, we introduce a new, formal methods-based approach to the specification and implementation of cryptography, present a number of scenarios of use, an overview of the language, and present part of a specification of the advanced encryption standard.","PeriodicalId":435910,"journal":{"name":"IEEE Military Communications Conference, 2003. MILCOM 2003.","volume":"15 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":"114879732","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}