MILCOM 2002. Proceedings最新文献_第10页

A covert communication system using an optimized wideband chaotic carrier 一种采用优化宽带混沌载波的隐蔽通信系统

MILCOM 2002. Proceedings Pub Date : 2002-10-07 DOI: 10.1109/MILCOM.2002.1179673

N. Reddell, T. Welch, E. M. Bollt

{"title":"A covert communication system using an optimized wideband chaotic carrier","authors":"N. Reddell, T. Welch, E. M. Bollt","doi":"10.1109/MILCOM.2002.1179673","DOIUrl":"https://doi.org/10.1109/MILCOM.2002.1179673","url":null,"abstract":"We explore the advantages of designing a communication system. based on chaos by using digital signal processing techniques. Existing work developing chaotic communication schemes has been done on a theoretical basis or in component based electrical circuits that are not as flexible, particularly for research. Our work takes a unique technological approach towards exploring the benefits of chaos. We use discrete methods to implement chaotic dynamical systems. Most of our current results are from MATLAB simulations, but we are working towards implementing chaos on digital signal processors (DSP). These high-speed processors produce a chaotic carrier through flexible software algorithms. The use of discrete methods allows for schemes that outperform earlier systems. We demonstrate a new dual synchronizing response system that exploits the ability to store samples over an entire bit period and then perform an intelligent comparison. Our results show better bit error probability in comparison to previously published chaotic techniques. We introduce a method and algorithms for improving the bit error performance of our scheme by systematically searching for better parameter sets.","PeriodicalId":191931,"journal":{"name":"MILCOM 2002. Proceedings","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-10-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125357395","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: 6

Serially concatenated convolutional coding for frequency-hopped PSK in partial-band jamming 部分频带干扰下跳频PSK的串行级联卷积编码

MILCOM 2002. Proceedings Pub Date : 2002-10-07 DOI: 10.1109/MILCOM.2002.1179569

W. Phoel

引用次数: 9

An adaptive-transmission protocol for direct-sequence spread-spectrum packet radio networks 面向直接序列扩频分组无线网的自适应传输协议

MILCOM 2002. Proceedings Pub Date : 2002-10-07 DOI: 10.1109/MILCOM.2002.1179584

F. J. Block, M. Pursley

{"title":"An adaptive-transmission protocol for direct-sequence spread-spectrum packet radio networks","authors":"F. J. Block, M. Pursley","doi":"10.1109/MILCOM.2002.1179584","DOIUrl":"https://doi.org/10.1109/MILCOM.2002.1179584","url":null,"abstract":"Wireless communication channels may change greatly from one transmission to the next due to variations in propagation loss and interference. The use of fixed transmission parameters for such channels results in wasted energy when channel conditions are good. Adaptation of the power, code rate, and symbol rate reduces energy consumption and interference caused to other systems. Such adaptation requires information about the characteristics of the channel, which is more difficult to obtain in a packet radio network or other mobile ad hoc network than in a typical cellular communication system. We present techniques to provide partial information about the channel state, and we describe and evaluate a protocol that uses this information to adapt the transmission parameters in a direct-sequence spread-spectrum packet radio network. The channel-state information consists of three statistics that are derived in different subsystems of the receiver. From these statistics, the receiver extracts information about the channel conditions which is provided to the transmitter in an acknowledgment packet or control packet. The performance of the adaptive-transmission protocol is compared to a system with fixed transmission parameters and to an adaptive protocol that is furnished with perfect knowledge of the channel state at the completion of each transmission.","PeriodicalId":191931,"journal":{"name":"MILCOM 2002. Proceedings","volume":"162 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-10-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128072877","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: 5

A busy-tone based directional MAC protocol for ad hoc networks 用于自组织网络的基于忙音的定向MAC协议

MILCOM 2002. Proceedings Pub Date : 2002-10-07 DOI: 10.1109/MILCOM.2002.1179655

Zhuochuan Huang, Chien-Chung Shen, C. Srisathapornphat, C. Jaikaeo

引用次数: 133

Bandwidth management of MilSatCom links for multimedia network traffic MilSatCom链路的带宽管理，用于多媒体网络流量

MILCOM 2002. Proceedings Pub Date : 2002-10-07 DOI: 10.1109/MILCOM.2002.1180411

C. Belisle, C. Auger, Jing Peng, M. Phisel, M. Delorey

引用次数: 2

Two-class packet reservation multiple access, motivations and design 两类分组保留多址，动机和设计

MILCOM 2002. Proceedings Pub Date : 2002-10-07 DOI: 10.1109/MILCOM.2002.1179644

S. Taha, M. Kavehrad

引用次数: 1

COTS satellite-terrestrial broadcast system for deployed communications 用于部署通信的COTS卫星-地面广播系统

MILCOM 2002. Proceedings Pub Date : 2002-10-07 DOI: 10.1109/MILCOM.2002.1180436

R. Segura

{"title":"COTS satellite-terrestrial broadcast system for deployed communications","authors":"R. Segura","doi":"10.1109/MILCOM.2002.1180436","DOIUrl":"https://doi.org/10.1109/MILCOM.2002.1180436","url":null,"abstract":"The paper presents a prototype system that demonstrates the joint use of COTS digital video broadcast (DVB) technology and military-grade IP encryption devices for providing high speed networking overlays to terrestrial wide area networks (WAN). The system exploits both satellite and terrestrial versions of the DVB standards to transmit and relay wideband data broadcasts to strategic, deployed and mobile users. Prototyping in this area is motivated by NATO's requirements for a system capable of simultaneously distributing large volumes of information at very high transfer rates to deployed forces. The satellite-terrestrial broadcast system (SBS) makes exclusive use of commercial off-the-shelf (COTS) hardware and software, and fully relies on open standards. Military-grade IP encryption devices secure the wideband link for both point-to-point and point-to-multipoint satellite and terrestrial broadcast data transfers. Organic narrowband communications channels are adopted to carry return traffic upstream, under a highly asymmetric network configuration. Asymmetric networking techniques enable end-to-end services between content providers and information consumers over the split path configuration. A terrestrial extension of the system based on digital terrestrial TV technology enables reception of the broadcast streams by mobile users, in both land and maritime environments.","PeriodicalId":191931,"journal":{"name":"MILCOM 2002. Proceedings","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-10-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122149027","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

Loop control architectures for symbol timing synchronization in sampled data receivers 采样数据接收机中符号定时同步的环路控制体系结构

MILCOM 2002. Proceedings Pub Date : 2002-10-07 DOI: 10.1109/MILCOM.2002.1179609

M. Rice, F. Harris

{"title":"Loop control architectures for symbol timing synchronization in sampled data receivers","authors":"M. Rice, F. Harris","doi":"10.1109/MILCOM.2002.1179609","DOIUrl":"https://doi.org/10.1109/MILCOM.2002.1179609","url":null,"abstract":"Symbol timing synchronization is an important component in a receiver designed to recover data from a digitally modulated waveform. Current trends favor sampled data architectures to perform the synchronization, matched filtering, and detection required to recover the data. Symbol timing synchronizers in sampled data receivers differ from their continuous-time counterparts: the functionality in a sampled data receiver is as an adaptive interpolator as opposed to a sample and hold. This paper explores architectures that can be used for loop control (i.e. adjustment of the fractional interpolation interval) by contrasting and comparing three different methods using numerically controlled oscillators. Assuming the Nyquist sampling rate is N samples/symbol, the first method operates at MN samples/symbol where M is an upsample factor. The second method operates at N samples/symbol. It is shown that these two methods automatically compensate for misadjustments between the sample clock and symbol clock frequencies. The third method operates at 1 sample/symbol. In this case, we show that auxiliary control must also be included to adjust the clocking of data into the filter bank to account for small differences in the sample clock and the data clock.","PeriodicalId":191931,"journal":{"name":"MILCOM 2002. Proceedings","volume":"34 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-10-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131619412","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: 13

JTRS applications to DoD programs: technology and implementation JTRS在国防部项目中的应用:技术和实现

MILCOM 2002. Proceedings Pub Date : 2002-10-07 DOI: 10.1109/MILCOM.2002.1179692

D. M. Cooper, R. Prill, G. Horihan

引用次数: 2

TCP congestion control in shared satellite environments 共享卫星环境中的TCP拥塞控制

MILCOM 2002. Proceedings Pub Date : 2002-10-07 DOI: 10.1109/MILCOM.2002.1180412

K. Scott, P. Feighery, B. Crow, M. Jurik

{"title":"TCP congestion control in shared satellite environments","authors":"K. Scott, P. Feighery, B. Crow, M. Jurik","doi":"10.1109/MILCOM.2002.1180412","DOIUrl":"https://doi.org/10.1109/MILCOM.2002.1180412","url":null,"abstract":"This paper describes the use of a transparent TCP gateway to improve the performance of applications operating in a shared secure satellite environment. Typically, a satellite gateway is installed at each end of the satellite link, and the gateways process all traffic traversing the link. With the proliferation of virtual private network (VPN) technologies, multiple encrypted tunnels can be established over a satellite link. If transparent TCP gateways are used to optimize application performance, a pair of gateways are required at the egress points of each tunnel. Many TCP gateways perform poorly in this situation because they do not implement congestion control on their 'satellite' sides, resulting in network congestion between the sending gateways and the satellite uplink. Our approach is to use Space Communications Protocol Standards (SCPS) transparent transport layer gateways, which are capable of implementing a variety of congestion control schemes on their terrestrial and satellite sides. By using a variant of the TCP Vegas congestion control algorithm, the gateways can communicate indirectly (by detecting changes in packet round-trip times) to efficiently share the satellite bandwidth. Results show that this improves performance over end-to-end TCP without congesting the network between the gateways and the uplink as would pure rate-control.","PeriodicalId":191931,"journal":{"name":"MILCOM 2002. Proceedings","volume":"76 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-10-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125687590","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: 9