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Proceedings of MILCOM '93 - IEEE Military Communications Conference最新文献

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Low rate speech coders for robust VHF radiocommunications 用于稳健甚高频无线电通信的低速率语音编码器
Proceedings of MILCOM '93 - IEEE Military Communications Conference Pub Date : 1993-10-11 DOI: 10.1109/MILCOM.1993.408629
A. Vigier, S. Le Dreau
{"title":"Low rate speech coders for robust VHF radiocommunications","authors":"A. Vigier, S. Le Dreau","doi":"10.1109/MILCOM.1993.408629","DOIUrl":"https://doi.org/10.1109/MILCOM.1993.408629","url":null,"abstract":"The authors describe the use of low rate vocoders (4800 b/s, 2400 b/s and 800 b/s) as an alternative to CVSD 16 kb/s coder. The available bit rate on the global 16 kb/s channel can be used to improve robustness of the communication or to offer new services (multiplexing speech and data or proposing a duplex service). The authors report the theoretical studies that took into account both the speech coder and the channel characteristics to derive an error protection scheme. A real-time implementation has been carried out. It uses a vehicular radio set type of the PR4G VHF/frequency hopping system. Performance has been assessed during field experiments and comparisons have been drawn with the standard CVSD coder. Finally, perspectives of industrialization are mentioned.<<ETX>>","PeriodicalId":323612,"journal":{"name":"Proceedings of MILCOM '93 - IEEE Military Communications Conference","volume":"114 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1993-10-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125778149","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
Reduced state Viterbi receivers for digital mobile communications 用于数字移动通信的简化状态维特比接收机
Proceedings of MILCOM '93 - IEEE Military Communications Conference Pub Date : 1993-10-11 DOI: 10.1109/MILCOM.1993.408605
B. Herscovici, G. Gulak
{"title":"Reduced state Viterbi receivers for digital mobile communications","authors":"B. Herscovici, G. Gulak","doi":"10.1109/MILCOM.1993.408605","DOIUrl":"https://doi.org/10.1109/MILCOM.1993.408605","url":null,"abstract":"In the context of the new North American TDMA standard for digital cellular, the problem the authors seek to address is the design of an adaptive detector and differential phase decoder. The technique used in the design is that of maximum likelihood sequence estimation, implemented by use of the Viterbi algorithm. Two solutions are proposed, the shifted Viterbi receiver and the differential Viterbi receiver. Each can be implemented using current hardware technology, with the tradeoffs presented. Both architectures simplify the signal constellation at the input of the Viterbi detector. The behavior of the shifted Viterbi receiver and the differential Viterbi receiver was simulated under various SNR, with or without fading, with pseudorandom or correlated data patterns and with various LMS algorithm gain.<<ETX>>","PeriodicalId":323612,"journal":{"name":"Proceedings of MILCOM '93 - IEEE Military Communications Conference","volume":"2007 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1993-10-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129764880","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
Mean acquisition time for noncoherent PN sequence sequential acquisition schemes 非相干PN序列序列采集方案的平均采集时间
Proceedings of MILCOM '93 - IEEE Military Communications Conference Pub Date : 1993-10-11 DOI: 10.1109/MILCOM.1993.408712
A. W. Lam, S. Tantaratana
{"title":"Mean acquisition time for noncoherent PN sequence sequential acquisition schemes","authors":"A. W. Lam, S. Tantaratana","doi":"10.1109/MILCOM.1993.408712","DOIUrl":"https://doi.org/10.1109/MILCOM.1993.408712","url":null,"abstract":"Sequential PN code acquisition schemes have the potential to achieve the best performance, but they are the least analyzed because of the analytical difficulties. The authors have proposed and investigated (1991-92) the truncated sequential probability ratio test (TSPRT) for spread-spectrum noncoherent PN code acquisition. It was shown to be much better than the conventional fixed sample size (FSS) scheme in the average sample number (ASN) at fixed detection and false-alarm probabilities. For system design purposes, however, the mean acquisition time is more informative. This paper reports results on the mean acquisition time for the TSPRT. Numerical data that includes Rician fading effect is also presented. Results show that the proposed TSPRT is efficient, robust (against fading), fast, and suitable for real-time low-cost implementation.<<ETX>>","PeriodicalId":323612,"journal":{"name":"Proceedings of MILCOM '93 - IEEE Military Communications Conference","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1993-10-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128339849","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
Performance analysis of networks of low-earth-orbit satellites with integrated voice/data traffic 具有综合话音/数据流量的低地球轨道卫星网络性能分析
Proceedings of MILCOM '93 - IEEE Military Communications Conference Pub Date : 1993-10-11 DOI: 10.1109/MILCOM.1993.408675
W.‐B. Yang, E. Geraniotis
{"title":"Performance analysis of networks of low-earth-orbit satellites with integrated voice/data traffic","authors":"W.‐B. Yang, E. Geraniotis","doi":"10.1109/MILCOM.1993.408675","DOIUrl":"https://doi.org/10.1109/MILCOM.1993.408675","url":null,"abstract":"The uplinks and downlinks of all satellites in the network considered use Code-Division Multiple-Access (CDMA) with direct-sequence spread-spectrum (DS/SS) signaling. Double coverage is assumed (i.e., two satellites are in sight of all users at all times) and this is explored to mitigate the effects of shadowing on voice and data users. The performance measures of the LEO system evaluated are the average blocking probability and the average throughput of voice traffic as well as the average throughput of data traffic. In analysis the effects of CDMA on packet reception are described by both a threshold model and a graceful degradation model.<<ETX>>","PeriodicalId":323612,"journal":{"name":"Proceedings of MILCOM '93 - IEEE Military Communications Conference","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1993-10-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128405085","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
Rural and urban groundwave propagation in a desert environment 沙漠环境下城乡地波传播
Proceedings of MILCOM '93 - IEEE Military Communications Conference Pub Date : 1993-10-11 DOI: 10.1109/MILCOM.1993.408591
M. Packer, R.I. Desourdis
{"title":"Rural and urban groundwave propagation in a desert environment","authors":"M. Packer, R.I. Desourdis","doi":"10.1109/MILCOM.1993.408591","DOIUrl":"https://doi.org/10.1109/MILCOM.1993.408591","url":null,"abstract":"HF groundwave communication in desert climates can be limited to the radio line-of-sight. In this case, near vertical incidence skywave can be employed to provide short-range HF connectivity. The Communication Engineering Laboratory (CEL) of Science Applications International Corporation (SAIC) performed a series of groundwave propagation measurements in both rural and urban areas in a desert environment. The measurements were performed as part of a test and evaluation program for an HF groundwave communication system. The authors discuss the HF groundwave measurements and compare measured path-loss values with computer predictions.<<ETX>>","PeriodicalId":323612,"journal":{"name":"Proceedings of MILCOM '93 - IEEE Military Communications Conference","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1993-10-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127346373","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
Efficient use of SATCOM resources in MSE networks (DAMA for MSE) MSE网络中卫星通信资源的有效利用(DAMA for MSE)
Proceedings of MILCOM '93 - IEEE Military Communications Conference Pub Date : 1993-10-11 DOI: 10.1109/MILCOM.1993.408715
W. Biagini, Michael Masciari
{"title":"Efficient use of SATCOM resources in MSE networks (DAMA for MSE)","authors":"W. Biagini, Michael Masciari","doi":"10.1109/MILCOM.1993.408715","DOIUrl":"https://doi.org/10.1109/MILCOM.1993.408715","url":null,"abstract":"The evolving AirLand Operations (ALO) concept of force deployment in the tactical arena significantly alters requirements for command, control, and communications. Communications must be maintained between widely separated groups of users (enclaves) who cannot be adequately serviced by traditional terrestrial networks. Satellite communications (both military and commercial) have been proposed as one possible response to this range extension requirement. The simple insertion of this technology into large wideband terrestrial networks such as Mobile Subscriber Equipment (MSE) or TRI-TAC can result in inefficient use of limited satellite resources, which in turn limits the operational effectiveness of the overall communication system. In addition, operational and technical constraints inherent in the switching network must be considered to ensure maximum flexibility of the integrated network. In this paper, GTE identifies the design constraints and issues associated with satellite range extension for the MSE network and describes several feasible Demand Assignment Multiple Access (DAMA) architectures. The authors describe the results of a performance analysis and simulation effort that uses GTE tools to develop models of ALO scenarios and then evaluate the relative efficiency and mission effectiveness of these different DAMA alternatives. Each alternative is shown to provide significant improvement over the non-DAMA case but a cost-benefit tradeoff indicates one approach to be preferred. Studies are continuing to characterize these results in more detail and to investigate the extension of these results to alternative satellite systems.<<ETX>>","PeriodicalId":323612,"journal":{"name":"Proceedings of MILCOM '93 - IEEE Military Communications Conference","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1993-10-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128929926","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
Tactical line-of-sight path reliability: Propagation climate factors 战术视线路径可靠性:传播气候因素
Proceedings of MILCOM '93 - IEEE Military Communications Conference Pub Date : 1993-10-11 DOI: 10.1109/MILCOM.1993.408595
K.H. Brockel, J.R. Inserra, F.G. Loso, P. Major, V. Procopio, K. D. Chaney, R. J. Locher, A. Vigants, W. Barnett, M. Riehl
{"title":"Tactical line-of-sight path reliability: Propagation climate factors","authors":"K.H. Brockel, J.R. Inserra, F.G. Loso, P. Major, V. Procopio, K. D. Chaney, R. J. Locher, A. Vigants, W. Barnett, M. Riehl","doi":"10.1109/MILCOM.1993.408595","DOIUrl":"https://doi.org/10.1109/MILCOM.1993.408595","url":null,"abstract":"A line-of-sight propagation reliability working group, convened by the US Army Communications-Electronics Command, has developed a propagation reliability model. The Model includes a climate factor for fading to allow worldwide planning of reliable terrestrial communications links. The authors introduce a new application concept, a monthly climate factor, to meet tactical needs since the probability of fading can vary significantly from month to month. Climate factor estimation is described and illustrated with examples from the Arabian peninsula. The propagation reliability model, including monthly climate factors, has been incorporated in a new battlefield automated radio planning system, the Joint Tactical Area Communications Systems (Provisional) Network Planning Terminal.<<ETX>>","PeriodicalId":323612,"journal":{"name":"Proceedings of MILCOM '93 - IEEE Military Communications Conference","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1993-10-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130606120","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: 8
Analysis of two trunk congestion relief schemes 两种干线纾缓挤塞方案分析
Proceedings of MILCOM '93 - IEEE Military Communications Conference Pub Date : 1993-10-11 DOI: 10.1109/MILCOM.1993.408690
S. Adamson, S. P. Gordon, V. Mosley
{"title":"Analysis of two trunk congestion relief schemes","authors":"S. Adamson, S. P. Gordon, V. Mosley","doi":"10.1109/MILCOM.1993.408690","DOIUrl":"https://doi.org/10.1109/MILCOM.1993.408690","url":null,"abstract":"During natural disasters such as earthquakes and hurricanes, call volume in the public switched network (PSN) often increases to levels that cause trunk overloads in switches. The result of this overload is an overall degradation in the grade-of-service of the PSN. At times like these it is vitally important that local, state, and federal officials be able to communicate in a reliable and timely manner so that the business of caring and providing for the emergency needs of people is unhampered. To combat the degrading effects of large call volumes, various priority controls have been developed to alleviate trunk overload for critical or select users. This paper describes two trunk congestion relief schemes and the results of a detailed analysis that quantified the performance characteristics and the availability of these schemes in the PSN.<<ETX>>","PeriodicalId":323612,"journal":{"name":"Proceedings of MILCOM '93 - IEEE Military Communications Conference","volume":"96 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1993-10-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126841682","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: 12
Adaptive locally optimum processing for moderately spread SATCOM AJ modes 中等传播SATCOM AJ模式的自适应局部最优处理
Proceedings of MILCOM '93 - IEEE Military Communications Conference Pub Date : 1993-10-11 DOI: 10.1109/MILCOM.1993.408507
J. Bond, H. Schmidt
{"title":"Adaptive locally optimum processing for moderately spread SATCOM AJ modes","authors":"J. Bond, H. Schmidt","doi":"10.1109/MILCOM.1993.408507","DOIUrl":"https://doi.org/10.1109/MILCOM.1993.408507","url":null,"abstract":"SATCOM channels with nonregenerative, saturating downlink amplifiers can be severely degraded by uplink jamming which \"captures\" the downlink amplifier. The use of direct sequence spread spectrum techniques to overcome the jamming leads to a large reduction in information throughput. The authors propose a moderately spread mode using AJ enhancement through use of adaptive locally optimum processing. They present simulation results for the proposed new mode. These simulations indicate that at least 6 dB additional AJ gain can be provided by the proposed processing in narrowband (less than 10% bandwidth) jamming with good downlink channel conditions (SNR greater than 17 dB).<<ETX>>","PeriodicalId":323612,"journal":{"name":"Proceedings of MILCOM '93 - IEEE Military Communications Conference","volume":"130 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1993-10-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121303281","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
Simulation and performance of full-response offset quadrature modulation systems with cosine series symbol shaping 余弦系列符号整形全响应偏置正交调制系统的仿真与性能
Proceedings of MILCOM '93 - IEEE Military Communications Conference Pub Date : 1993-10-11 DOI: 10.1109/MILCOM.1993.408679
W. Burmeister, M. Belkerdid, D. Malocha, P.G. Schelbert
{"title":"Simulation and performance of full-response offset quadrature modulation systems with cosine series symbol shaping","authors":"W. Burmeister, M. Belkerdid, D. Malocha, P.G. Schelbert","doi":"10.1109/MILCOM.1993.408679","DOIUrl":"https://doi.org/10.1109/MILCOM.1993.408679","url":null,"abstract":"Cosine series symbol shaping has been investigated as a means of achieving spectral efficiency in offset quadrature binary modulation (QBM) systems. However, only a limited set of cosine series shaping functions for full-response signaling has been reported. This paper presents a synthesis technique for generating a set, for given constraints, of cosine series shaping functions for QBM systems. The criteria for the synthesis technique are discussed, and a table summarizing the synthesis of the set of cosine series is generated. This paper also presents the performance of the offset QBM system employing cosine series symbol shaping, and having an optimum coherent receiver. The receiver structure, which is based on the cosine series pulse shaping matched filter implementation, is discussed in detail. Furthermore, the QBM transceiver performance is investigated in a nonlinear channel environment. The effects of soft channel compression on spectral efficiency, envelope uniformity, and probability of error are presented. A hyperbolic tangent function, characteristic of bipolar transistor amplifier behavior, is used as the model for the nonlinear channel. Theoretical and simulated results of the system probability of error are presented.<<ETX>>","PeriodicalId":323612,"journal":{"name":"Proceedings of MILCOM '93 - IEEE Military Communications Conference","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1993-10-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126612031","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
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