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Adaptive nulling for multiple desired signals based on signal waveform estimation 基于信号波形估计的多期望信号自适应消零
MILCOM 92 Conference Record Pub Date : 1992-10-11 DOI: 10.1109/MILCOM.1992.243973
K. Bell, J. Capetanakis, J. Bugler
{"title":"Adaptive nulling for multiple desired signals based on signal waveform estimation","authors":"K. Bell, J. Capetanakis, J. Bugler","doi":"10.1109/MILCOM.1992.243973","DOIUrl":"https://doi.org/10.1109/MILCOM.1992.243973","url":null,"abstract":"The authors consider adaptive nulling of noise and interference in the presence of multiple desired signals. They reformulate the adaptive nulling problem as a signal estimation problem and derive several adaptive nulling algorithms which require varying amounts of prior information about the desired signals. The information required by the algorithms may include signal directions of arrival, relative power levels, and/or probability density functions for signal directions of arrival when they are not known exactly. It is shown that the optimal signal estimators derived are equivalent to the classical adaptive nulling techniques of Howells-Applebaum, least-mean-square, and Frost when supplied with certain prior information, and that in several cases, the resulting expressions for the optimal weights have forms to which well-known adaptation procedures can be readily applied.<<ETX>>","PeriodicalId":394587,"journal":{"name":"MILCOM 92 Conference Record","volume":"86 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1992-10-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121738598","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
A phase ambiguity resolution technique for TCM 一种基于TCM的相位模糊消解技术
MILCOM 92 Conference Record Pub Date : 1992-10-11 DOI: 10.1109/MILCOM.1992.244047
W. Osborne, J.L. Whittington
{"title":"A phase ambiguity resolution technique for TCM","authors":"W. Osborne, J.L. Whittington","doi":"10.1109/MILCOM.1992.244047","DOIUrl":"https://doi.org/10.1109/MILCOM.1992.244047","url":null,"abstract":"The authors present the simulation model, performance evaluation, and hardware implementation of a technique to resolve phase ambiguity in trellis-coded modulation (TCM) where the popular Viterbi algorithm is utilized. While this approach has been used with BPSK (binary phase shift keying) and QPSK (quadrature phase shift keying), its application to multilevel modulation schemes (M>4) is novel and of interest because it provides a viable alternative to rotationally invariant codes. This approach does not require any arithmetic computations and can be accomplished with minimal hardware. The results presented here are being used to implement a 32-sector phase-quantized TCM system utilizing 8 PSK modulation.<<ETX>>","PeriodicalId":394587,"journal":{"name":"MILCOM 92 Conference Record","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1992-10-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123196653","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
Properties of the classification scheme of the security option for Internet datagrams Internet数据报安全选项分类方案的属性
MILCOM 92 Conference Record Pub Date : 1992-10-11 DOI: 10.1109/MILCOM.1992.244114
C. Yang, A. Billingsley
{"title":"Properties of the classification scheme of the security option for Internet datagrams","authors":"C. Yang, A. Billingsley","doi":"10.1109/MILCOM.1992.244114","DOIUrl":"https://doi.org/10.1109/MILCOM.1992.244114","url":null,"abstract":"It is pointed out that the security option for datagrams that are transmitted through the Internet will be essential as utilization grows. The newly issued DoD IPSO (Internet Protocol Security Option) provides one octet for the security classification of each datagram transmitted. The current scheme requires a Hamming distance of four between any two valid values. The determination of the values in this octet is a nontrivial problem and presents some interesting properties. The authors discuss the complexity of the problem, its generalization, and the properties of the octet value assignment.<<ETX>>","PeriodicalId":394587,"journal":{"name":"MILCOM 92 Conference Record","volume":"49 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1992-10-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134516205","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
Adjacent-channel interference effects in shaped biphase-shift keyed satellite communications 异形双相移键控卫星通信中的相邻信道干扰效应
MILCOM 92 Conference Record Pub Date : 1992-10-11 DOI: 10.1109/MILCOM.1992.243989
R. Ziemer
{"title":"Adjacent-channel interference effects in shaped biphase-shift keyed satellite communications","authors":"R. Ziemer","doi":"10.1109/MILCOM.1992.243989","DOIUrl":"https://doi.org/10.1109/MILCOM.1992.243989","url":null,"abstract":"The author presents computer simulation results for the effects of adjacent channel interference in shaped biphase-shift-keyed (SBPSK) communications systems. The channel separations and channel filter characteristics used are typical of VHF/UHF military satcom links. Two types of detection methods are used-integrate-and-dump, which is typical of current SBPSK receivers, and maximum likelihood sequence detection, which makes use of the inherent memory of the SBPSK signal to improve performance in the interference environment. The results indicate that, with the possibility of oscillator instability offsetting the desired spectrum within the passband of the channel filter, it is better to go with a wide channel filter and accept more adjacent channel interference than to use a narrow filter and suffer additional degradation due to frequency offsets.<<ETX>>","PeriodicalId":394587,"journal":{"name":"MILCOM 92 Conference Record","volume":"74 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1992-10-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134635949","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: 4
Generation of soft information in a frequency-hopping HF radio system using neural networks 用神经网络生成跳频高频无线电系统中的软信息
MILCOM 92 Conference Record Pub Date : 1992-10-11 DOI: 10.1109/MILCOM.1992.244000
G. Andersson, H. Andersson
{"title":"Generation of soft information in a frequency-hopping HF radio system using neural networks","authors":"G. Andersson, H. Andersson","doi":"10.1109/MILCOM.1992.244000","DOIUrl":"https://doi.org/10.1109/MILCOM.1992.244000","url":null,"abstract":"An attempt has been made to improve the performance of a digital frequency-hopping radio system on the HF band. The object was to generate soft information for the convolutional decoder in the system and thus improve its error correcting capability. The nature of the problem implied that a solution with neural networks would be of interest. Computer simulations demonstrated that a two-layered network with two neurons in the first layer and one output neuron gives the best results. The results show that a neural network and the chosen convolutional code together have an extensive error correcting capability. For example, one could transmit information essentially correctly, despite the fact that noise, causing a bit error rate of 1.5% on all the used frequencies, was added to the channel and an active jammer completely corrupted a fourth of the frequencies used.<<ETX>>","PeriodicalId":394587,"journal":{"name":"MILCOM 92 Conference Record","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1992-10-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133697707","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
Cellular control channel capacity: evaluation and enhancement 蜂窝控制信道容量:评估与增强
MILCOM 92 Conference Record Pub Date : 1992-10-11 DOI: 10.1109/MILCOM.1992.244048
S. Faruque
{"title":"Cellular control channel capacity: evaluation and enhancement","authors":"S. Faruque","doi":"10.1109/MILCOM.1992.244048","DOIUrl":"https://doi.org/10.1109/MILCOM.1992.244048","url":null,"abstract":"The author evaluates the cellular control channel capacity as a function of C/I and proposes a modified frequency plan in conjunction with antenna engineering to enhance the performance. It is shown that a directional antenna with downtilt provides line-of-sight propagation in the serving base and out-of-sight propagation in adjacent bases. The resulting effect is a further improvement of C/I performance. It is shown that the control channel capacity is a function of C/I and Rayleigh fading.<<ETX>>","PeriodicalId":394587,"journal":{"name":"MILCOM 92 Conference Record","volume":"72 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1992-10-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133121023","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
An all digital 650-Mbps demonstration receiver for NASA's high data rate satellite applications 全数字650-Mbps演示接收机，用于NASA的高数据速率卫星应用
MILCOM 92 Conference Record Pub Date : 1992-10-11 DOI: 10.1109/MILCOM.1992.244166
Matthew J. Thompson, W. Jones
{"title":"An all digital 650-Mbps demonstration receiver for NASA's high data rate satellite applications","authors":"Matthew J. Thompson, W. Jones","doi":"10.1109/MILCOM.1992.244166","DOIUrl":"https://doi.org/10.1109/MILCOM.1992.244166","url":null,"abstract":"A demonstration receiver that tracks and demodulates 650-Mb/s QPSK (quadrature phase-shift keying) data has been developed, utilizing a parallel processing VLSI architecture and multirate digital signal processing, to meet upcoming NASA satellite communication requirements. Data rates of 650 Mb/s were achieved with low implementation loss and two-sample/symbol operation using high-speed digital GaAs logic in the front and back end, with the majority of the computationally intensive signal processing implemented in CMOS VLSI. Using a parallel architecture combined with multirate digital signal processing means that receiver speed is no longer limited to the speed of the signal processing hardware elements, but only by the speed of the analog-to-digital converters. In addition to unsurpassed data rate levels, superior bit error rate (BER) performance has been achieved using a joint feedforward and feedback timing estimator and data recovery algorithm. Laboratory performance results for the hardware demonstration receiver are presented as well as a detailed discussion of the hardware implementation and signal processing algorithms.<<ETX>>","PeriodicalId":394587,"journal":{"name":"MILCOM 92 Conference Record","volume":"50 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1992-10-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130268419","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
GOBNET (Gigabit Object Network) 千兆对象网络
MILCOM 92 Conference Record Pub Date : 1992-10-11 DOI: 10.1109/MILCOM.1992.243960
H. Kim, D. Farber
{"title":"GOBNET (Gigabit Object Network)","authors":"H. Kim, D. Farber","doi":"10.1109/MILCOM.1992.243960","DOIUrl":"https://doi.org/10.1109/MILCOM.1992.243960","url":null,"abstract":"The authors present an introduction to the high-level design of GOBNET, an ongoing research effort at the University of Pennsylvania to extend the Memmet distributed shared memory research to a wide-area environment. GOBNET also supports distributed object-oriented systems. The authors describe some of the issues in the design of GOBNET, including memory as the abstraction of wide-area-network, object-orientation, and object location.<<ETX>>","PeriodicalId":394587,"journal":{"name":"MILCOM 92 Conference Record","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1992-10-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114218177","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
National Transportable Telecommunications Capability: commercial satellite and cellular communications for emergency preparedness 国家移动通信能力:用于应急准备的商业卫星和蜂窝通信
MILCOM 92 Conference Record Pub Date : 1992-10-11 DOI: 10.1109/MILCOM.1992.244177
R.J. Council, N. J. Sorovacu
{"title":"National Transportable Telecommunications Capability: commercial satellite and cellular communications for emergency preparedness","authors":"R.J. Council, N. J. Sorovacu","doi":"10.1109/MILCOM.1992.244177","DOIUrl":"https://doi.org/10.1109/MILCOM.1992.244177","url":null,"abstract":"The authors describe the National Transportable Telecommunications Capability (NTTC) system, a quick-reaction emergency satellite, cellular, and microwave communications package. The purpose of the NTTC is to restore last mile connectivity to remote isolated areas in the United States or abroad that have been devastated by hurricanes, earthquakes, or other natural or man-made disasters. The NTTC is self-contained for rapid airlift in a single C-130 military transport, or may be transported by land or sea. The system is leased service that uses commercially available equipment to augment federal government communications during natural disasters or civil emergencies when the public switched network (PSN) may be disabled or nonexistent. Upon deployment, the NTTC will provide toll-quality duplex telephony to aid in coordinating relief efforts by establishing local cellular radio telephone communications among parties to the relief effort and linking those communications by satellite to the PSN in Clarksburg, Maryland.<<ETX>>","PeriodicalId":394587,"journal":{"name":"MILCOM 92 Conference Record","volume":"84 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1992-10-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114394720","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
Low Earth orbit satellite technology for PCS 低地球轨道卫星PCS技术
MILCOM 92 Conference Record Pub Date : 1992-10-11 DOI: 10.1109/MILCOM.1992.244073
P. N. Cloutier, P. Swan
{"title":"Low Earth orbit satellite technology for PCS","authors":"P. N. Cloutier, P. Swan","doi":"10.1109/MILCOM.1992.244073","DOIUrl":"https://doi.org/10.1109/MILCOM.1992.244073","url":null,"abstract":"The authors examine today's major issues in terrestrial personal communication systems (PCS) and show the emerging technologies necessary for global PCS. It is suggested that, with the development of existing technologies and the spectrum allocations, the Iridium system of low Earth orbit satellites will revolutionize PCS to make telecommunications a global phenomenon. The Iridium system will allow high-user-density wireless service of up to 1.6 million subscribers by the year 2000, consumer digital wireless service that is truly portable and easy to use, one-way messaging and paging services, and data, graphics and compressed voice.<<ETX>>","PeriodicalId":394587,"journal":{"name":"MILCOM 92 Conference Record","volume":"89 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1992-10-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116284954","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
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