Proceedings of TCC'94 - Tactical Communications Conference最新文献_第4页

Multi-access properties of transform domain spread spectrum systems 变换域扩频系统的多址特性

Proceedings of TCC'94 - Tactical Communications Conference Pub Date : 1994-05-10 DOI: 10.1109/TCC.1994.472093

J. D. Endsley, Richard A. Dean

{"title":"Multi-access properties of transform domain spread spectrum systems","authors":"J. D. Endsley, Richard A. Dean","doi":"10.1109/TCC.1994.472093","DOIUrl":"https://doi.org/10.1109/TCC.1994.472093","url":null,"abstract":"Summary form only given, as follows. This paper examines the multi-access properties of transform domain spread spectrum systems for use in tactical battlefield scenarios. Transform domain spread spectrum (XDSS) systems evolved as an attractive solution for low probability of detection/interception (LPD/I) systems that operate in interference and multipath environments. However, the same properties that make XDSS systems robust to interference and multipath, when combined with multi-access features, make XDSS systems attractive for tactical battlefields as well. We illustrate the advantages of transform domain spread spectrum over more traditional direct sequence spread spectrum methods by examining three multi-access techniques: (1) orthogonally coded direct sequence (OCDS), (2) cyclic code shift keying (CCSK), and (3) XDSS. All of these systems can be either coherent or noncoherent; however, we concentrate on non-coherent M-ary waveform modulation methods. We first show that while OCDS systems mitigate multi-user interference problems when the received user waveforms are synchronized, they lose this property when any time offsets are introduced by multipath and propagation delay. In addition, OCDS systems do not naturally resolve the time shifted versions caused by multipath, so RAKE processing for the M-ary signal set can be expensive. On the other hand, a CCSK system can readily use fast convolution methods to naturally resolve circularly delayed versions of the signal. Provided the processing gain is sufficiently large, a CCSK system can easily implement a RAKE combiner. The CCSK system, however, only provides isolation from other users by taking advantage of the low cross correlation properties of the spreading code. This make CCSK systems subject to near/far interference problems. By showing that XDSS systems have orthogonal CCSK signal sets, we illustrate how XDSS systems can provide robust, multi-access communications in tactical battlefield scenarios where ECCM and LPD/I properties are important.<<ETX>>","PeriodicalId":206310,"journal":{"name":"Proceedings of TCC'94 - Tactical Communications Conference","volume":"48 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1994-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130322463","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

The impact of national ISDN on commercial and tactical communications 国家ISDN对商业和战术通信的影响

Proceedings of TCC'94 - Tactical Communications Conference Pub Date : 1994-05-10 DOI: 10.1109/TCC.1994.472117

J. Ramsey

{"title":"The impact of national ISDN on commercial and tactical communications","authors":"J. Ramsey","doi":"10.1109/TCC.1994.472117","DOIUrl":"https://doi.org/10.1109/TCC.1994.472117","url":null,"abstract":"The objectives of a national integrated services digital network (NISDN) are shared by both government and industry. Industry has adopted a set of specifications developed by Bellcore, known as NISDN-1 to allow ISDN services and features to operate transparently among switches of different models or manufacturers. ISDN provides multiple services such as voice, data, video, and graphics, on demand, on the existing telephone wiring we use today. With the recent launch of NISDN-1, the local exchange networks collectively have 22 NISDN-1 switches in the United States and Canada equipped with Common Channel Signaling System 7 (CCSS7) and 64 kb/s clear channel capability. Each switch is connected to at least one interexchange carrier network for voice and circuit switched data, and at least one interexchange carrier for packet data. Tactical users must have an information system that is flexible, mobile, secure and often rugged. It must provide timely, accurate information. NISDN is currently addressing these requirements in the commercial market place. As the industry direction of NISDN develops, it should be recognized that the public switched telephone network (PSTN) is evolving from a circuit switched fixed bandwidth toward a packet switched network with flexible bandwidth. As its various network components (including NISDN) transition to an end-to-end digital network, users and service providers will be increasingly able to access, develop, and offer new types of services and applications that will benefit both commercial and government communications.<<ETX>>","PeriodicalId":206310,"journal":{"name":"Proceedings of TCC'94 - Tactical Communications Conference","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1994-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131669116","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

A multivariate rank sum test for network simulation validation 网络仿真验证的多变量秩和检验

Proceedings of TCC'94 - Tactical Communications Conference Pub Date : 1994-05-10 DOI: 10.1109/TCC.1994.472085

A. Brodeen, M. S. Taylor

{"title":"A multivariate rank sum test for network simulation validation","authors":"A. Brodeen, M. S. Taylor","doi":"10.1109/TCC.1994.472085","DOIUrl":"https://doi.org/10.1109/TCC.1994.472085","url":null,"abstract":"A primary goal of any verification and validation process should be to enhance both the correctness of a simulation and the confidence placed in its results. One challenge is to develop a process that is at the same time feasible and compatible with an organization's needs, and can be applied to both existing simulations as well as new ones. Multivariate methods can be used to test the hypothesis of agreement between simulated predictions and empirical observations. This paper describes a statistical test useful for the validation of simulations of battlefield communications networks. The method employs a multivariate nonparametric rank sum test with the aid of a computer-intensive randomization procedure to assess the significance of the defined test statistic. For illustrative purposes, the validation procedure is applied to a simulation that was developed to duplicate a configuration tested, in which \"messages\" were passed over a communications network using the combination of the Tactical Fire Direction System (TACFIRE) protocol and Single-Channel Ground and Airborne Radio System (SINCGARS) Combat Net Radios (CNR). The purpose of this research is to strengthen the link between experimentation and simulation, both of which should be utilized in evaluating communications systems' measures of performance (MOP).<<ETX>>","PeriodicalId":206310,"journal":{"name":"Proceedings of TCC'94 - Tactical Communications Conference","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1994-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114968564","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

Security architecture for tactical/strategic interoperability 用于战术/战略互操作性的安全体系结构

Proceedings of TCC'94 - Tactical Communications Conference Pub Date : 1994-05-10 DOI: 10.1109/TCC.1994.472126

M.E. Dark, R. A. Dean

引用次数: 4

Throughput of a FHMA system for variable rate coding and interference estimates 可变速率编码和干扰估计下FHMA系统的吞吐量

Proceedings of TCC'94 - Tactical Communications Conference Pub Date : 1994-05-10 DOI: 10.1109/TCC.1994.472130

B. Woerner, A.I. Wardhana

{"title":"Throughput of a FHMA system for variable rate coding and interference estimates","authors":"B. Woerner, A.I. Wardhana","doi":"10.1109/TCC.1994.472130","DOIUrl":"https://doi.org/10.1109/TCC.1994.472130","url":null,"abstract":"Frequency hopped multiple access (FHMA) systems are sed to provide a secure link in military communication systems. The author considers a decentralized FHMA packet communication system in which a collection transmitter-receiver pairs share a common channel. One criterion to measure the performance of a FHMA system effectively is the average normalized throughput. The optimum average normalized throughput of the system is a function of both the number of users simultaneously supported and the information rate of each user. This information rate is determined by the error correction code employed in the system. Intuitively, as the number of users increases the throughput will increase; however, the multi-user interference will require additional error protection, thereby lowering the information rate. For a given number of simultaneous users, there is an optimum code rate which maximizes throughput. The authors investigate the average normalized throughput performance of a FHMA system for several cases. There are two extreme cases: The case in which number of users in the system is unknown, but the probability is modeled as a random distribution, and the case in which the number of users is exactly known. The more interesting and practical case is the situation in which imperfect estimates of the number of active users are available. These estimates could be generated by monitoring a few frequency slots at any given time. The authors investigate the performance of the FHMA and the choice of optimal code rate for a variety this case. Reed-Solomon codes are considered.<<ETX>>","PeriodicalId":206310,"journal":{"name":"Proceedings of TCC'94 - Tactical Communications Conference","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1994-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127131554","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: 2

HF to wireline modem conversion 高频到有线调制解调器转换

Proceedings of TCC'94 - Tactical Communications Conference Pub Date : 1994-05-10 DOI: 10.1109/TCC.1994.472101

J. Batzer, J. Bertrand, C. Haight

引用次数: 1

High-speed frequency synthesizer for spread spectrum communication systems 扩频通信系统用高速频率合成器

Proceedings of TCC'94 - Tactical Communications Conference Pub Date : 1994-05-10 DOI: 10.1109/TCC.1994.472122

W. A. Chren

引用次数: 2

Wideband RF downconverters for digital telemetry receivers 用于数字遥测接收机的宽带射频下变频器

Proceedings of TCC'94 - Tactical Communications Conference Pub Date : 1994-05-10 DOI: 10.1109/TCC.1994.472124

D. Bancroft

引用次数: 0

Tactical communication EMI/EMC co-site problems and solutions 战术通信EMI/EMC共址问题及解决方案

Proceedings of TCC'94 - Tactical Communications Conference Pub Date : 1994-05-10 DOI: 10.1109/TCC.1994.472125

M. Bahu, L. L. Taylor

引用次数: 1

Communications reliability of tactical wideband radio systems 战术宽带无线电系统的通信可靠性

Proceedings of TCC'94 - Tactical Communications Conference Pub Date : 1994-05-10 DOI: 10.1109/TCC.1994.472098

K.H. Brockel, V. Procopio, W. Barnett, A. Vigants

引用次数: 0