MILCOM 1982 - IEEE Military Communications Conference - Progress in Spread Spectrum Communications最新文献

筛选
英文 中文
Noncoherent Demodulation of Spread Spectrum Signals using Charge Coupled Devices 利用电荷耦合器件的扩频信号非相干解调
S. Glisic
{"title":"Noncoherent Demodulation of Spread Spectrum Signals using Charge Coupled Devices","authors":"S. Glisic","doi":"10.1109/MILCOM.1982.4805935","DOIUrl":"https://doi.org/10.1109/MILCOM.1982.4805935","url":null,"abstract":"An analysis of error probability for noncoherent demodulation of spread spectrum signals using charge - coupled devices is presented. Average error probability for SSK-DS-SS (Sequence Shift-keying DS-SS), IQ-DS-SS (In Phase + Quadrature DS-SS), IIQ-DS-SS (Improved IQ-DS-SS) and DDIQ-DS-SS (Differential Data IQ-DS-SS) system is derived.","PeriodicalId":179832,"journal":{"name":"MILCOM 1982 - IEEE Military Communications Conference - Progress in Spread Spectrum Communications","volume":"32 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1982-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126513675","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
Hopping Patterns for Bounded Mutual Interference in Frequency Hopping Multiple Access 跳频多址中有界相互干扰的跳频模式
T. Seay
{"title":"Hopping Patterns for Bounded Mutual Interference in Frequency Hopping Multiple Access","authors":"T. Seay","doi":"10.1109/MILCOM.1982.4805942","DOIUrl":"https://doi.org/10.1109/MILCOM.1982.4805942","url":null,"abstract":"Theoretical bounds are given for the number and length of hopping patterns with a guaranteed maximum number of pairwise hits. Constructions for hopping pattern sets which achieve the single hit bounds are given, as well as hopping patterns which guarantee the maximum number of pairwise hits in the presence of time or frequency asynchrony, or both. It is shown that variable rate coding permits \"averaging\" of the worst case interference compared to fixed rate coding, when the data messages are of varying duration.","PeriodicalId":179832,"journal":{"name":"MILCOM 1982 - IEEE Military Communications Conference - Progress in Spread Spectrum Communications","volume":"35 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1982-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126602200","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: 16
Adaptive Array with Limiter in Feedback Path Preliminary Results 反馈路径中带有限制器的自适应阵列初步结果
E. Ha, D. Chang, B. Forman
{"title":"Adaptive Array with Limiter in Feedback Path Preliminary Results","authors":"E. Ha, D. Chang, B. Forman","doi":"10.1109/MILCOM.1982.4805992","DOIUrl":"https://doi.org/10.1109/MILCOM.1982.4805992","url":null,"abstract":"The Hughes experimental multiple-element adaptive array antenna system is based on a hybrid implementation of Widrow's LMS algorithm. A microcomputer samples the analog correlator outputs, then computes the new antenna weight settings and updates the quadrature weighting circuitries accordingly. A hard limiter placed in the feedback path prevents permanent capture by the strongest interference. This configuration appears to circumvent the difficulty in nulling against multiple interferences. Laboratory results demonstrate up to 60 dB cancellation of jammers in a few hundred iterations. System performance degrades to about 30 dB suppression for a 12 percent bandwidth jammer.","PeriodicalId":179832,"journal":{"name":"MILCOM 1982 - IEEE Military Communications Conference - Progress in Spread Spectrum Communications","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1982-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127075717","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 Low-Cost Spread-Spectrum Packet Radio 低成本扩频分组无线电
D. Behrman, W. C. Fifer
{"title":"A Low-Cost Spread-Spectrum Packet Radio","authors":"D. Behrman, W. C. Fifer","doi":"10.1109/MILCOM.1982.4806014","DOIUrl":"https://doi.org/10.1109/MILCOM.1982.4806014","url":null,"abstract":"The goal of the Low Cost Packet Radio (LPR) Program funded by DARPA, via a contract through CECOM, Contract No. DAAK80-81-C-0213, and being developed by Hazeltine Corporation, is a packet radio unit with low cost, low weight, low volume, low power, and high reliability. The LPR consists of a digitally controlled spread spectrum radio and a microprocessor acting as a packet switch. It is to be used in support of experiments with large packet radio networks. The radio utilizes direct-sequence, spread-spectrum techniques using MSK modulation. A code-changeable, SAW matched filter is employed. It is followed by a decision-directed, SAW fading memory filter to provide synchronization, multipath accumulation, and demodulation reference functions. Two data transmission rates are provided at 100 kbps or 400 kbps. In order to improve the reliability of the network links, a convolutional encoder/sequential decoder with forward-error correction capability at three code rates has been incorporated. To achieve an undetected BER of 10-12, CRC is employed for both encoded and uncoded modes of operation. Besides the RF data link, the LPR provides an input/output data link at either low or high speed. The microprocessor system architecture has been optimized to maximize its bus bandwidth.","PeriodicalId":179832,"journal":{"name":"MILCOM 1982 - IEEE Military Communications Conference - Progress in Spread Spectrum Communications","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1982-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130883787","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
Army Spread Spectrum - Evolution or Revolution 陆军扩频——进化还是革命
P. Sass
{"title":"Army Spread Spectrum - Evolution or Revolution","authors":"P. Sass","doi":"10.1109/MILCOM.1982.4806005","DOIUrl":"https://doi.org/10.1109/MILCOM.1982.4806005","url":null,"abstract":"The Army is currently developing a variety of ground based tactical communications systems intended to support the needs of the soldier on the automated battlefield of the 1990's. These new systems employ wideband digital techniques to support requirements for speed and volume of data transfer, and have turned to spread spectrum for the Anti-jam (AJ) protection required for survivability under the electronic warfare threat anticipated over the next twenty years. This paper surveys the essential technical characteristics of CECOM's current spread spectrum system developments for ground-to-ground communications, explains their historical and technical evolution, and explores the underlying rationale for selection of Frequency Hopping (FH) versus Direct Sequence (DS) spread spectrum techniques in each case. Observations and future directions conclude the paper.","PeriodicalId":179832,"journal":{"name":"MILCOM 1982 - IEEE Military Communications Conference - Progress in Spread Spectrum Communications","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1982-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134270216","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
Analysis of Pseudo-Noise Spread-Spectrum Communication over Randomly Time-Variant Channels Without Assuming Perfect Synchronization 随机时变信道中非完全同步伪噪声扩频通信分析
H. Ochsner
{"title":"Analysis of Pseudo-Noise Spread-Spectrum Communication over Randomly Time-Variant Channels Without Assuming Perfect Synchronization","authors":"H. Ochsner","doi":"10.1109/MILCOM.1982.4805906","DOIUrl":"https://doi.org/10.1109/MILCOM.1982.4805906","url":null,"abstract":"The effect of certain time-variant channels on the performance of a PN spread-spectrum system is analyzed without assuming perfect synchronization of the receiver's PN sequence. The results show that maximizing the power of the despread signal can be markedly suboptimal concerning the signal-to-noise ratio and that even well-known tracking loops may exhibit only moderate performance.","PeriodicalId":179832,"journal":{"name":"MILCOM 1982 - IEEE Military Communications Conference - Progress in Spread Spectrum Communications","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1982-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115572398","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: 3
Spread Spectrum EMC: Measurements and Analysis 扩频电磁兼容:测量与分析
P. Major
{"title":"Spread Spectrum EMC: Measurements and Analysis","authors":"P. Major","doi":"10.1109/MILCOM.1982.4806009","DOIUrl":"https://doi.org/10.1109/MILCOM.1982.4806009","url":null,"abstract":"Measurements have been made of a spread spectrum transmitter as an interference source to conventional receivers. The measurements provide data to permit some validation of models for EMC analysis. This paper discusses one set of results.","PeriodicalId":179832,"journal":{"name":"MILCOM 1982 - IEEE Military Communications Conference - Progress in Spread Spectrum Communications","volume":"82 s56","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1982-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120854689","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
The Optimal Code Rate vs. a Partial Band Jammer 最佳码率与部分波段干扰
R. McEliece, W. Stark
{"title":"The Optimal Code Rate vs. a Partial Band Jammer","authors":"R. McEliece, W. Stark","doi":"10.1109/MILCOM.1982.4805908","DOIUrl":"https://doi.org/10.1109/MILCOM.1982.4805908","url":null,"abstract":"We take an abstract view of the problem of coding vs. a jammer on a binary symmetric channel, and conclude that either: coding can completely newtralize the jammer, i.e. render him no worse than uniform background noise; or: the best code rate is exactly r = .3790. Here \"best\" is with respect to channel capacity as a figure of merit. If the channel cutoff rate is used instead, the best rate is .247. We also give some extensions to M-ary channels, M ¿ 2.","PeriodicalId":179832,"journal":{"name":"MILCOM 1982 - IEEE Military Communications Conference - Progress in Spread Spectrum Communications","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1982-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121289152","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
Uplink Antenna Nulling for High Data Rate EHF Satellite Communications 高数据速率EHF卫星通信的上行天线零化
A. A. Castro
{"title":"Uplink Antenna Nulling for High Data Rate EHF Satellite Communications","authors":"A. A. Castro","doi":"10.1109/MILCOM.1982.4806021","DOIUrl":"https://doi.org/10.1109/MILCOM.1982.4806021","url":null,"abstract":"This paper presents and discusses different approaches available to provide uplink protection to high data rate Users of an EHF satellite communication system, by combining temporal spreading gain with the spatial filtering of a spacecraft adaptive nulling antenna. The generalized performance of different nulling approaches is analyzed, as well as the limitations for simultaneously achieving high resolution over large field of view and wide bandwidth, when multiple Users access the satellite.","PeriodicalId":179832,"journal":{"name":"MILCOM 1982 - IEEE Military Communications Conference - Progress in Spread Spectrum Communications","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1982-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116436186","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
Maximin Adaptive Array Algorithm Maximin自适应阵列算法
R. Mathis, K. Kaufman
{"title":"Maximin Adaptive Array Algorithm","authors":"R. Mathis, K. Kaufman","doi":"10.1109/MILCOM.1982.4805978","DOIUrl":"https://doi.org/10.1109/MILCOM.1982.4805978","url":null,"abstract":"A new algorithm for adaptively steering antenna pattern nulls while maintaining a pattern maximum on a desired signal is described. The derivation is carried out by maximizing an estimate of the signal-power-to-interference-power ratio. The resulting algorithm employs double loops; one set maximizes the desired signal power and the other set minimizes the interference power. The MAXIMIN algorithm does not require detailed knowledge of the received signal. Rather, it requires only that the desired signal plus interference and noise be separated from interference and noise alone. A detailed simulation of a spread-spectrum (FH/PN) modem incorporating the MAXIMIN algorithm has been developed. The simulation incorporates all known hardware effects having a significant impact on the operation of the algorithm such as: differing group delays of critical filters, nonlinear effects in the cross-correlation multipliers, limited bit resolution in A/D and D/A converters, and mutual coupling between the array elements. Excellent performance in terms of convergence speed and final signal-to-noise ratio is obtained over a wide range of interference conditions. This approach appears to be well suited to frequency-hopping modems.","PeriodicalId":179832,"journal":{"name":"MILCOM 1982 - IEEE Military Communications Conference - Progress in Spread Spectrum Communications","volume":"38 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1982-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123167505","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
0
×
引用
GB/T 7714-2015
复制
MLA
复制
APA
复制
导出至
BibTeX EndNote RefMan NoteFirst NoteExpress
×
提示
您的信息不完整,为了账户安全,请先补充。
现在去补充
×
提示
您因"违规操作"
具体请查看互助需知
我知道了
×
提示
确定
请完成安全验证×
相关产品
×
本文献相关产品
联系我们:info@booksci.cn Book学术提供免费学术资源搜索服务,方便国内外学者检索中英文文献。致力于提供最便捷和优质的服务体验。 Copyright © 2023 布克学术 All rights reserved.
京ICP备2023020795号-1
ghs 京公网安备 11010802042870号
Book学术文献互助
Book学术文献互助群
群 号:481959085
Book学术官方微信