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MILCOM 92 Conference Record最新文献

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Site specific propagation prediction models for PCS design and installation 针对pc设计和安装的现场特定传播预测模型
MILCOM 92 Conference Record Pub Date : 1992-10-11 DOI: 10.1109/MILCOM.1992.244123
T. Tran, T. Rappaport
{"title":"Site specific propagation prediction models for PCS design and installation","authors":"T. Tran, T. Rappaport","doi":"10.1109/MILCOM.1992.244123","DOIUrl":"https://doi.org/10.1109/MILCOM.1992.244123","url":null,"abstract":"The authors present novel site-specific propagation prediction methods for emerging personal communication system (PCS) services which will offer high capacity in urban settings. The propagation prediction models, composed of 3-D diffraction and ray tracing, are being implemented as software tools on SUN computer workstations. A geographical information system software package is being used to interface building and terrain data with the propagation prediction programs. Early work at Virginia Tech's Mobile and Portable Radio Research Group shows that the predicted signal strengths are within a few decibels of average measured signal strengths for some test cases.<<ETX>>","PeriodicalId":394587,"journal":{"name":"MILCOM 92 Conference Record","volume":"46 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":"123954557","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
Tactical voice input/output devices 战术语音输入/输出设备
MILCOM 92 Conference Record Pub Date : 1992-10-11 DOI: 10.1109/MILCOM.1992.244027
D. Ruppe, B. Tirabassi
{"title":"Tactical voice input/output devices","authors":"D. Ruppe, B. Tirabassi","doi":"10.1109/MILCOM.1992.244027","DOIUrl":"https://doi.org/10.1109/MILCOM.1992.244027","url":null,"abstract":"The authors address the technology insertion and feasibility demonstration issues that are paramount to the effective implementation of voice interaction between man and machine. Results of preliminary feasibility demonstrations are discussed in three critical technology areas: (1) input and output appliances that offer noise immunity, (2) voice recognition and speech synthesis accuracy, and (3) command and control vocabulary development and application dependencies. Ear-canal microphones and speakers are examined for their natural noise immunity attributes. State-of-the-art voice recognition algorithms provide speaker-independent qualities that need no soldier training, prior to use, with the added benefit of maintaining accuracy when the speaker is stressed or fatigued. Integration of the voice input and outpuuevices with existing C2 (command and control) systems is discussed in the context of user friendly and natural ways of supporting operations on the move.<<ETX>>","PeriodicalId":394587,"journal":{"name":"MILCOM 92 Conference Record","volume":"31 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":"116660270","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 comparative study of networking link enhancement algorithms 网络链路增强算法的比较研究
MILCOM 92 Conference Record Pub Date : 1992-10-11 DOI: 10.1109/MILCOM.1992.243968
C. Yang, L. Misirlioğlu
{"title":"A comparative study of networking link enhancement algorithms","authors":"C. Yang, L. Misirlioğlu","doi":"10.1109/MILCOM.1992.243968","DOIUrl":"https://doi.org/10.1109/MILCOM.1992.243968","url":null,"abstract":"Link enhancement provides a better routability and hence survivability of a communication network. Though the problem is NP-complete, good heuristics do exist that can provide near-optimal solutions with negligible computation time. An investigation of different heuristics shows the merit of each approach. It is noted that two major improvements can be made over the linear search algorithms: constrained range (CR) and reduced candidate set (RCS). The search of constrained restricted candidate set (CRCS) has been proven to be the best known heuristic for solving the link enhancement problems: The annealing process or the (r+1)/sup st/ chance algorithm can piggy back on a CRCS solution and improves it to the optimal one with negligible incremental computation time.<<ETX>>","PeriodicalId":394587,"journal":{"name":"MILCOM 92 Conference Record","volume":"68 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":"116718484","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
Multichannel adaptive blind equalization with CRIMNO-MSE technique 多通道自适应盲均衡crino - mse技术
MILCOM 92 Conference Record Pub Date : 1992-10-11 DOI: 10.1109/MILCOM.1992.244158
A. Bessios, C. Nikias
{"title":"Multichannel adaptive blind equalization with CRIMNO-MSE technique","authors":"A. Bessios, C. Nikias","doi":"10.1109/MILCOM.1992.244158","DOIUrl":"https://doi.org/10.1109/MILCOM.1992.244158","url":null,"abstract":"A novel adaptive blind equalization algorithm for multichannel systems is presented. The cost function is an augmented version of CRIMNO, which also includes the mean square error (MSE) criterion between the outputs of the multichannel equalizers. It is shown that by forcing the outputs of the equalizers to be equal, as it should be during perfect equalization, the convergence of the CRIMNO-MSE technique is faster than that of the individual single-channel CRIMNO algorithms. Two additional hybrid schemes, which use a finite length memory window to form the MSE of the outputs of the equalizers, are developed. These schemes are called the CRIMNO-MSEM and the CMA-MSEM, where the final M denotes the memory length. Simulation results justify the performance of the new algorithms against single-channel CRIMNO algorithms.<<ETX>>","PeriodicalId":394587,"journal":{"name":"MILCOM 92 Conference Record","volume":"2 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":"115231237","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
Adaptive communication system design for HF/VHF multiple-mechanism propagation paths 高频/甚高频多机制传播路径的自适应通信系统设计
MILCOM 92 Conference Record Pub Date : 1992-10-11 DOI: 10.1109/MILCOM.1992.244125
M. Darnell, B. Honary, G. Vongas
{"title":"Adaptive communication system design for HF/VHF multiple-mechanism propagation paths","authors":"M. Darnell, B. Honary, G. Vongas","doi":"10.1109/MILCOM.1992.244125","DOIUrl":"https://doi.org/10.1109/MILCOM.1992.244125","url":null,"abstract":"The authors describe the nature of multiple-mechanism propagation paths (MMPPs) in the HF/low-VHF frequency range from 2 to 200 MHz. The design of systems to exploit such paths is then considered; channel encoding/decoding and real-time channel evaluation aspects are emphasized. Finally, the overall architectural framework for an MMPP radio system, currently under development, is presented.<<ETX>>","PeriodicalId":394587,"journal":{"name":"MILCOM 92 Conference Record","volume":"500 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":"116305267","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
Performance analysis of FH/MFSK systems using clipper receiver and error correcting codes against band multitone jammer in background noise environment 背景噪声环境下采用截波接收机和纠错码的跳频/多频信号系统抗带多音干扰性能分析
MILCOM 92 Conference Record Pub Date : 1992-10-11 DOI: 10.1109/MILCOM.1992.244096
Jinn-Ja Cheng, Shih-Kai Lee, M. Lin
{"title":"Performance analysis of FH/MFSK systems using clipper receiver and error correcting codes against band multitone jammer in background noise environment","authors":"Jinn-Ja Cheng, Shih-Kai Lee, M. Lin","doi":"10.1109/MILCOM.1992.244096","DOIUrl":"https://doi.org/10.1109/MILCOM.1992.244096","url":null,"abstract":"The authors derive the symbol error probability for hard decision clipper receivers in an environment with both band multitone jamming and background noise interference. Using the results, they evaluate pairwise error probabilities for coded systems using majority vote decision (MVD) decoding with or without jamming state information (JSI). They find the optimum tone jamming strategies from the jammer's point of view and their worst case pairwise error probabilities from the communicator's point of view for various levels of background noise interference. It is found that the performance for MVD decoding with JSI is better than that for MVD decoding without JSI when noise interference is low. This result is reversed when noise interference is low. It is also found that the optimum value of the clipping level is always less than the signaling power level in low to moderate interference conditions.<<ETX>>","PeriodicalId":394587,"journal":{"name":"MILCOM 92 Conference Record","volume":"41 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":"127280648","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
The IONCAP program enhancement IONCAP程序增强
MILCOM 92 Conference Record Pub Date : 1992-10-11 DOI: 10.1109/MILCOM.1992.244071
D. Fang, H. Soicher
{"title":"The IONCAP program enhancement","authors":"D. Fang, H. Soicher","doi":"10.1109/MILCOM.1992.244071","DOIUrl":"https://doi.org/10.1109/MILCOM.1992.244071","url":null,"abstract":"The Ionospheric Communications Analysis and Prediction Program (IONCAP) is the most widely used HF transmission prediction program for US military and other applications. From the software applications viewpoint, however, the program is clumsy, slow, and complicated, as it allows only those users who have sufficient background in ionospheric physics and experience in computer data entry to operate the software. The authors discuss a new version of IONCAP that avoids those obvious user-unfriendly shortcomings and provides the further advantage of enhanced capability to the extent that a lay person can use it for various modern HF applications. The fundamental tool applied is the Microsoft-based Windows technology.<<ETX>>","PeriodicalId":394587,"journal":{"name":"MILCOM 92 Conference Record","volume":"57 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":"127476739","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
Use of a BPSK demodulator for a QPSK signal with identical I & Q sequences except small time misalignments 使用BPSK解调器的QPSK信号具有相同的I和Q序列，除了小的时间失调
MILCOM 92 Conference Record Pub Date : 1992-10-11 DOI: 10.1109/MILCOM.1992.243992
H.M. Kwon
{"title":"Use of a BPSK demodulator for a QPSK signal with identical I & Q sequences except small time misalignments","authors":"H.M. Kwon","doi":"10.1109/MILCOM.1992.243992","DOIUrl":"https://doi.org/10.1109/MILCOM.1992.243992","url":null,"abstract":"The possibility of using existing QPSK (quadrature phase shift keying) transmitter design and the BPSK (binary phase shift keying) demodulator with Costas carrier recovery at the White Sands Ground Terminal was studied for the space station Freedom Ku-band downlink at 50 Mb/s data rate. To generate the QPSK signal, the in-phase (I)-channel takes the data bit sequence and the quadrature-phase (Q)-channel takes the copy of the data sequence with implementation time delay t/sub 0/. The bit error probability (BEP) degradation due to time misalignment t/sub 0/ and phase jitter at the Costas loop in a BPSK demodulation for the QPSK signal was derived. It was observed that the BEP difference between two systems, the BPSK signal with BPSK demodulation and the QPSK signal with BPSK demodulation, is small when t/sub 0/ is less than 10% of the data bit time interval and the closed-loop bandwidth is less than 1% of the data rate. However, it was observed that the degradation in the BEP increases and gets worse for time misalignment t/sub 0/ larger than 10% of the bit time interval even when closed-loop bandwidth is small, such as 1% of the data rate.<<ETX>>","PeriodicalId":394587,"journal":{"name":"MILCOM 92 Conference Record","volume":"8 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":"126363299","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
Probability of bit error for DS/SSMA systems with MPSK signaling and complex signature sequences 具有MPSK信号和复杂签名序列的DS/SSMA系统的误码概率
MILCOM 92 Conference Record Pub Date : 1992-10-11 DOI: 10.1109/MILCOM.1992.243990
F. Ozluturk, S. Tantaratana, A. W. Lam
{"title":"Probability of bit error for DS/SSMA systems with MPSK signaling and complex signature sequences","authors":"F. Ozluturk, S. Tantaratana, A. W. Lam","doi":"10.1109/MILCOM.1992.243990","DOIUrl":"https://doi.org/10.1109/MILCOM.1992.243990","url":null,"abstract":"The authors consider a direct-sequence spread-spectrum multiple-access (DS/SSMA) communication system with M-ary phase-shift keyed (MPSK) signaling. Users in the system use complex signature sequences. A bounding technique is used to obtain arbitrarily tight upper and lower bounds on the probability of bit error. Numerical results are presented for Frank-Zadoff-Chu (FZC) and near-optimal four-phase complex sequences, as well as binary Gold sequences, for binary phase shift keying, (BPSK), 4-PSK, and 8-PSK. Results show that complex sequences can yield better performance than binary sequences in MPSK signaling. Using complex sequences, the number of signature sequences with good correlation properties is greatly enlarged.<<ETX>>","PeriodicalId":394587,"journal":{"name":"MILCOM 92 Conference Record","volume":"18 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":"125114916","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
Delay performance of continuous bit rate (CBR) traffic through an ATM multiplexer 通过ATM多路复用器的连续比特率(CBR)流量的延迟性能
MILCOM 92 Conference Record Pub Date : 1992-10-11 DOI: 10.1109/MILCOM.1992.244154
O. Yue, V. Poon
{"title":"Delay performance of continuous bit rate (CBR) traffic through an ATM multiplexer","authors":"O. Yue, V. Poon","doi":"10.1109/MILCOM.1992.244154","DOIUrl":"https://doi.org/10.1109/MILCOM.1992.244154","url":null,"abstract":"The authors describe an approximation for the delay distribution of CBR packets passing through an asynchronous transfer mode (ATM) multiplexer. It is based on the distribution of an M/D/1 queue with the arrival rate and the server idle probability suitably modified. The approximation is easy to calculate and is found to be quite accurate for a wide range of values simulated. Since the Laplace-Stieltjes transform (LST) of the distribution is also known, it is relatively easy to estimate the distribution of the edge-to-edge delay through the ATM network. By assuming statistical independence of the delay performance among the ATM nodes, and that the output process of a node is still approximately deterministic, the LST of the edge-to-edge delay distribution is the product of the individual LSTs and can be inverted using standard Laplace inversion techniques.<<ETX>>","PeriodicalId":394587,"journal":{"name":"MILCOM 92 Conference Record","volume":"21 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":"125125946","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
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