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[1992 Proceedings] Vehicular Technology Society 42nd VTS Conference - Frontiers of Technology最新文献

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Combined orthogonal/convolutional coding for a digital cellular CDMA system 数字蜂窝 CDMA 系统的正交/卷积组合编码
[1992 Proceedings] Vehicular Technology Society 42nd VTS Conference - Frontiers of Technology Pub Date : 1992-05-10 DOI: 10.1109/VETEC.1992.245396
F. Ling, D. Falconer
{"title":"Combined orthogonal/convolutional coding for a digital cellular CDMA system","authors":"F. Ling, D. Falconer","doi":"10.1109/VETEC.1992.245396","DOIUrl":"https://doi.org/10.1109/VETEC.1992.245396","url":null,"abstract":"A family of orthogonal/convolutional codes for mobile CDMA communications is discussed. Their design and implementational aspects are discussed. The R/sub 0/ parameter of this family of codes is analyzed and presented in a uniform format. It is shown that it is desirable to use a code with a higher mobile CDMA communications. Simulation results are given. In particular, the authors simulated a 2/6/64 orthogonal/convolutional code which has an advantage in E/sub b//N/sub 0/ of more than 1.2 dB over previously investigated coding schemes.<<ETX>>","PeriodicalId":114705,"journal":{"name":"[1992 Proceedings] Vehicular Technology Society 42nd VTS Conference - Frontiers of Technology","volume":"50 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1992-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129473856","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: 18
Update of RAM Mobile Data's packet data radio service 更新RAM移动数据的分组数据无线电服务
[1992 Proceedings] Vehicular Technology Society 42nd VTS Conference - Frontiers of Technology Pub Date : 1992-05-10 DOI: 10.1109/VETEC.1992.245282
J. Kilpatrick
{"title":"Update of RAM Mobile Data's packet data radio service","authors":"J. Kilpatrick","doi":"10.1109/VETEC.1992.245282","DOIUrl":"https://doi.org/10.1109/VETEC.1992.245282","url":null,"abstract":"The state of the service is presented, including coverage; the accelerated build-out schedule; current users of the service; the types of terminals and applications available; and how the Mobitex-based packet-switched radio data service system is being constructed. In addition, some of the technical details of the open Mobitex air interface are described in order to show how mobile terminals effectively operate in the difficult mobile radio environment.<<ETX>>","PeriodicalId":114705,"journal":{"name":"[1992 Proceedings] Vehicular Technology Society 42nd VTS Conference - Frontiers of Technology","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1992-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123936906","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
A statistical model for the simulation of multipath mobile propagation channel 多径移动传播信道仿真的统计模型
[1992 Proceedings] Vehicular Technology Society 42nd VTS Conference - Frontiers of Technology Pub Date : 1992-05-10 DOI: 10.1109/VETEC.1992.245455
F. Goulam, A. J. Levy
{"title":"A statistical model for the simulation of multipath mobile propagation channel","authors":"F. Goulam, A. J. Levy","doi":"10.1109/VETEC.1992.245455","DOIUrl":"https://doi.org/10.1109/VETEC.1992.245455","url":null,"abstract":"A statistical representation model of the wideband radio propagation channel is proposed. This model is intended to be used in a software channel simulator. This approach is original with regard to more classical ray models because it does not try to identify the physical rays within the impulse responses, but only to reproduce, as faithfully as possible, the behavior of the channel, with the help of rays without any physical meaning. The proposed model is developed on the definition of a randomly varying transversal filter, with a delay between taps of 1/B, assuming input signals of limited bandwidth B.<<ETX>>","PeriodicalId":114705,"journal":{"name":"[1992 Proceedings] Vehicular Technology Society 42nd VTS Conference - Frontiers of Technology","volume":"20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1992-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123950634","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: 9
Status of IVHS technical developments in the United States 美国IVHS技术发展现状
[1992 Proceedings] Vehicular Technology Society 42nd VTS Conference - Frontiers of Technology Pub Date : 1992-05-10 DOI: 10.1109/VETEC.1992.245390
F. Mammano, J. R. Bishop
{"title":"Status of IVHS technical developments in the United States","authors":"F. Mammano, J. R. Bishop","doi":"10.1109/VETEC.1992.245390","DOIUrl":"https://doi.org/10.1109/VETEC.1992.245390","url":null,"abstract":"The authors address the state of domestic technical developments in the five components of intelligent vehicle highway systems (IVHS): advanced traffic management systems (ATMS), advanced traveler information systems (ATIS), advanced vehicle control systems (AVCS), commercial vehicle operations (CVO), and advanced public transportation systems (APTS). Each component and current operational tests are briefly described. Particular emphasis is given to three current large-scale operational field tests (Pathfinder, TravTek, and ADVANCE) to illustrate the integration of the IVHS components.<<ETX>>","PeriodicalId":114705,"journal":{"name":"[1992 Proceedings] Vehicular Technology Society 42nd VTS Conference - Frontiers of Technology","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1992-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123634997","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: 9
Neural-network-based car drive train control 基于神经网络的汽车传动系统控制
[1992 Proceedings] Vehicular Technology Society 42nd VTS Conference - Frontiers of Technology Pub Date : 1992-05-10 DOI: 10.1109/VETEC.1992.245249
T. Hrycej
{"title":"Neural-network-based car drive train control","authors":"T. Hrycej","doi":"10.1109/VETEC.1992.245249","DOIUrl":"https://doi.org/10.1109/VETEC.1992.245249","url":null,"abstract":"The optimization of the drive train string for high comfort requirements involves several control problems. One is the determination of optimal torque trajectory. Classical solutions of this problem suffer from strongly nonmonotonic torque trajectory, resulting from the difficulty of formulating the monotonicity requirement in the classical quadratic objective function form. A model-based neural-network trainable controller has been applied to this problem. In contrast to previous neural-network approaches, it fully exploits the available information about the plant. By its capability of using an arbitrary nonlinear differentiable control objective function (as well as an arbitrary nonlinear differentiable plant), it allows a direct formulation of the torque monotonicity requirement. The development time for the controller has been only two days. No control engineering competence has been required-the design procedure is very general and automatic.<<ETX>>","PeriodicalId":114705,"journal":{"name":"[1992 Proceedings] Vehicular Technology Society 42nd VTS Conference - Frontiers of Technology","volume":"45 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1992-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124230525","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
Dual rate mobile data system 双速率移动数据系统
[1992 Proceedings] Vehicular Technology Society 42nd VTS Conference - Frontiers of Technology Pub Date : 1992-05-10 DOI: 10.1109/VETEC.1992.245267
U. Hansson, S. Sjoberg
{"title":"Dual rate mobile data system","authors":"U. Hansson, S. Sjoberg","doi":"10.1109/VETEC.1992.245267","DOIUrl":"https://doi.org/10.1109/VETEC.1992.245267","url":null,"abstract":"A mobile data system that uses two significantly different data rates on the air interface is described. In a cellular system it is the conditions prevailing for a mobile terminal at the cell border that set the limit for a reasonable data rate. However, there are conditions in the cell, e.g., a stationary terminal close to the base station, where it is possible to use a higher data rate. A system is described that is designed for 12.5-kHz land mobile radio channels. The system uses a binary digital FM of GMSK type as the default transmission mode, but it switches to multilevel CPM when radio conditions are found to be good by the terminal. Considerations on the choice of the number of levels, and on the performance and complexity of the multilevel signaling, are given. Criteria for deciding when conditions are good enough for a rate increase are suggested.<<ETX>>","PeriodicalId":114705,"journal":{"name":"[1992 Proceedings] Vehicular Technology Society 42nd VTS Conference - Frontiers of Technology","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1992-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127637197","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 adaptive coding scheme for mobile radio systems 一种移动无线电系统的自适应编码方案
[1992 Proceedings] Vehicular Technology Society 42nd VTS Conference - Frontiers of Technology Pub Date : 1992-05-10 DOI: 10.1109/VETEC.1992.245280
R. Deng, H. Zhou
{"title":"An adaptive coding scheme for mobile radio systems","authors":"R. Deng, H. Zhou","doi":"10.1109/VETEC.1992.245280","DOIUrl":"https://doi.org/10.1109/VETEC.1992.245280","url":null,"abstract":"An adaptive error-control coding scheme for binary digital FM mobile radio transmission is proposed. The scheme uses code combining through packet retransmissions. The number of transmissions of a packet is proportional to the channel fading/noise levels, which is in contrast to time diversity techniques where a fixed number of repetitions of a data packet is performed even in the absence of channel errors. Furthermore, the receiver uses received signal envelopes as channel state information which significantly improves the throughput and bit error rate (BER) performance. Performance of the proposed scheme is analyzed for Rayleigh fading channels with additive white Gaussian noise (AWGN), cochannel interference, and random FM noise.<<ETX>>","PeriodicalId":114705,"journal":{"name":"[1992 Proceedings] Vehicular Technology Society 42nd VTS Conference - Frontiers of Technology","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1992-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128159021","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 direct conversion receiver utilizing a novel FSK demodulator and a low-power-consumption quadrature mixer 一种采用新型FSK解调器和低功耗正交混频器的直接转换接收机
[1992 Proceedings] Vehicular Technology Society 42nd VTS Conference - Frontiers of Technology Pub Date : 1992-05-10 DOI: 10.1109/VETEC.1992.245279
K. Takahashi, M. Mimura, M. Hasegawa, M. Makimoto, Katsushi Yokozaki
{"title":"A direct conversion receiver utilizing a novel FSK demodulator and a low-power-consumption quadrature mixer","authors":"K. Takahashi, M. Mimura, M. Hasegawa, M. Makimoto, Katsushi Yokozaki","doi":"10.1109/VETEC.1992.245279","DOIUrl":"https://doi.org/10.1109/VETEC.1992.245279","url":null,"abstract":"Two novel technologies of direct conversion are introduced. One is an FSK demodulator based on a new architecture, and the other is a quadrature mixer for direct conversion. The FSK demodulator is composed of relative 90 degrees phase shifters and frequency multipliers suitable for digital circuit implementation, and it has shown a wide allowance for offsets of the local frequency. In designing the quadrature mixer IC, structural and numerical optimization was carried out for low power consumption. The demodulator and the quadrature mixer, including the surrounding circuits, have been integrated. In order to realize smaller size and advanced performance, the authors adopt appropriate silicon processes for each of these two ICs. The FSK direct conversion radio data receiver with a bit rate of 1200 b/s developed utilizing the above ICs has achieved excellent performance, as expected.<<ETX>>","PeriodicalId":114705,"journal":{"name":"[1992 Proceedings] Vehicular Technology Society 42nd VTS Conference - Frontiers of Technology","volume":"66 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1992-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125676622","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: 15
An integrated voice and data radio access system 一种综合话音和数据无线电接入系统
[1992 Proceedings] Vehicular Technology Society 42nd VTS Conference - Frontiers of Technology Pub Date : 1992-05-10 DOI: 10.1109/VETEC.1992.245428
Y. Akaiwa, T. Nomura, S. Minami
{"title":"An integrated voice and data radio access system","authors":"Y. Akaiwa, T. Nomura, S. Minami","doi":"10.1109/VETEC.1992.245428","DOIUrl":"https://doi.org/10.1109/VETEC.1992.245428","url":null,"abstract":"A method for a digital mobile radio communication system to incorporate data transmission into full-duplex digital voice transmission channels is presented. In this method a voice terminal sends a short packet to a base station prior to sending a voice signal. When the base station receives the short packet or detects a collision between the short packet and data packet, it inhibits data transmission. Finding a pause period of voice signal transmission, the base station broadcasts a message to enable the data transmission. The results of computer simulation with voice data from real telephone conversations show that through the present system the almost maximum performance of the slotted ALOHA system is reached. Applying the proposed method to a 12-channel, 32-kb/s voice coding TDMA system, one can get a data transmission channel with average capacity of 270 kb/s on the voice communication system.<<ETX>>","PeriodicalId":114705,"journal":{"name":"[1992 Proceedings] Vehicular Technology Society 42nd VTS Conference - Frontiers of Technology","volume":"43 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1992-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131939314","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: 9
Comparison of two interleaving techniques for CDMA radio communications systems CDMA无线电通信系统中两种交错技术的比较
[1992 Proceedings] Vehicular Technology Society 42nd VTS Conference - Frontiers of Technology Pub Date : 1992-05-10 DOI: 10.1109/VETEC.1992.245423
L. Chang, N. Sollenberger
{"title":"Comparison of two interleaving techniques for CDMA radio communications systems","authors":"L. Chang, N. Sollenberger","doi":"10.1109/VETEC.1992.245423","DOIUrl":"https://doi.org/10.1109/VETEC.1992.245423","url":null,"abstract":"For code-division multiple access (CDMA) radio communications systems, orthogonal signaling with noncoherent detection has been proposed when a reference phase is not available. Orthogonal signaling using Hadamard signals is considered. Performance of the channel using error-correcting coding together with bit-by-bit interleaving or Hadamard word-by-word interleaving is investigated. It is found for the same M-ary orthogonal signaling, at a given bit error ratio, the second technique with complete soft decision decoding gives significant reduction in the required signal-to-interference ratio over the first technique with slightly added complexity in the decoder.<<ETX>>","PeriodicalId":114705,"journal":{"name":"[1992 Proceedings] Vehicular Technology Society 42nd VTS Conference - Frontiers of Technology","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1992-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134588778","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: 20
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