Pub Date : 1976-03-24DOI: 10.1109/VTC.1976.1622328
D. Atchley, M. Hines, H. Howe, H. Stinehelfer, J. White
This paper describes several electronically-steered phased-array antennas for use in the HF, VHF and UHF bands. An approach is described which uses 4 vertical elements above the ground plane in a square pattern. With proper phasing, a directive beam of 97° width may be electronically switched in quadrants to provide full 360° azimuth coverage. This antenna provides significant forward gain and a high front-to-back ratio to provide suppression of interference not in the path of communication. An alternate approach uses three elements in a triangular configuration, each beam covering 120° of azimuth. Methods will be described for mode selection of omni and the four quadrantal directions using semiconductor switching.
{"title":"Electronically-steered antennas with 360°coverage for mobile use","authors":"D. Atchley, M. Hines, H. Howe, H. Stinehelfer, J. White","doi":"10.1109/VTC.1976.1622328","DOIUrl":"https://doi.org/10.1109/VTC.1976.1622328","url":null,"abstract":"This paper describes several electronically-steered phased-array antennas for use in the HF, VHF and UHF bands. An approach is described which uses 4 vertical elements above the ground plane in a square pattern. With proper phasing, a directive beam of 97° width may be electronically switched in quadrants to provide full 360° azimuth coverage. This antenna provides significant forward gain and a high front-to-back ratio to provide suppression of interference not in the path of communication. An alternate approach uses three elements in a triangular configuration, each beam covering 120° of azimuth. Methods will be described for mode selection of omni and the four quadrantal directions using semiconductor switching.","PeriodicalId":342659,"journal":{"name":"26th IEEE Vehicular Technology Conference","volume":"27 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1976-03-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122195036","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}
Pub Date : 1976-03-24DOI: 10.1109/VTC.1976.1622331
H. Magnuski
Spectrum is a multidimensional quantity. Considering this, AM, SSB, FM and digital modulation are compared for best spectrum utilization. The evils of high transmitter power are enumerated and some system configurations using low power are discussed. In particular, Prearranged Communication Path (PCP) systems using chains of low power repeaters are described. Looking into the future, it is predicted that PCP Systems using Delta Modulation will be widely used, providing improved service with privacy and much better spectrum utilization.
{"title":"Improving spectrum utilization in mobile radio communication","authors":"H. Magnuski","doi":"10.1109/VTC.1976.1622331","DOIUrl":"https://doi.org/10.1109/VTC.1976.1622331","url":null,"abstract":"Spectrum is a multidimensional quantity. Considering this, AM, SSB, FM and digital modulation are compared for best spectrum utilization. The evils of high transmitter power are enumerated and some system configurations using low power are discussed. In particular, Prearranged Communication Path (PCP) systems using chains of low power repeaters are described. Looking into the future, it is predicted that PCP Systems using Delta Modulation will be widely used, providing improved service with privacy and much better spectrum utilization.","PeriodicalId":342659,"journal":{"name":"26th IEEE Vehicular Technology Conference","volume":"31 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1976-03-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123586539","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}
Pub Date : 1976-03-24DOI: 10.1109/VTC.1976.1622340
D. Nicholson
This paper discusses various methods of improving the accuracy of a linear least squares solution algorithm which is commonly used in Time Difference of Arrival (TDOA), hyperbolic location systems. Topics considered include methods of generating a useful weighting matrix and a residue examination scheme as the basis for rejecting data contaminated by large propagation delay errors. The performance of two linear schemes is compared to that of the nonlinear least squares solution using some 2000 sets of actual TDOA measurements.
{"title":"Multipath and ducting tolerant location techniques for automatic vehicle location systems","authors":"D. Nicholson","doi":"10.1109/VTC.1976.1622340","DOIUrl":"https://doi.org/10.1109/VTC.1976.1622340","url":null,"abstract":"This paper discusses various methods of improving the accuracy of a linear least squares solution algorithm which is commonly used in Time Difference of Arrival (TDOA), hyperbolic location systems. Topics considered include methods of generating a useful weighting matrix and a residue examination scheme as the basis for rejecting data contaminated by large propagation delay errors. The performance of two linear schemes is compared to that of the nonlinear least squares solution using some 2000 sets of actual TDOA measurements.","PeriodicalId":342659,"journal":{"name":"26th IEEE Vehicular Technology Conference","volume":"23 4","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1976-03-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120858896","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}
Pub Date : 1976-03-24DOI: 10.1109/VTC.1976.1622334
R. L. Robinson
This paper describes five different radio systems which are used in the Southern Pacific's large railroad freight classification yard located in Colton, California. Each of these systems is discussed in turn, with emphasis on how that system is tailored to satisfy a specific communications requirement in the operation of the Colton Yard. It is intended that a discussion of the various radio applications in this yard will illustrate the types of communications which are necessary for operation of any large classification yard.
{"title":"Radio communications in the Colton yard","authors":"R. L. Robinson","doi":"10.1109/VTC.1976.1622334","DOIUrl":"https://doi.org/10.1109/VTC.1976.1622334","url":null,"abstract":"This paper describes five different radio systems which are used in the Southern Pacific's large railroad freight classification yard located in Colton, California. Each of these systems is discussed in turn, with emphasis on how that system is tailored to satisfy a specific communications requirement in the operation of the Colton Yard. It is intended that a discussion of the various radio applications in this yard will illustrate the types of communications which are necessary for operation of any large classification yard.","PeriodicalId":342659,"journal":{"name":"26th IEEE Vehicular Technology Conference","volume":"46 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1976-03-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131692751","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}
Pub Date : 1976-03-24DOI: 10.1109/VTC.1976.1622320
E. Addeo
The High Capacity Mobile Telephone Communications System (HCMTS) employs a 20K baud digital signaling system to provide information needed in the various stages of call setup and control. This paper describes the signal processing required for transmission and recovery of this digital information over the Rayleigh fading channel environment. An overview of the mobile data recovery system along with a discussion of spectrum considerations is given. Also, laboratory data taken with a Rayleigh fading simulator and results from field testing are given.
{"title":"An approach to digital signal processing for a high capacity mobile telephone system","authors":"E. Addeo","doi":"10.1109/VTC.1976.1622320","DOIUrl":"https://doi.org/10.1109/VTC.1976.1622320","url":null,"abstract":"The High Capacity Mobile Telephone Communications System (HCMTS) employs a 20K baud digital signaling system to provide information needed in the various stages of call setup and control. This paper describes the signal processing required for transmission and recovery of this digital information over the Rayleigh fading channel environment. An overview of the mobile data recovery system along with a discussion of spectrum considerations is given. Also, laboratory data taken with a Rayleigh fading simulator and results from field testing are given.","PeriodicalId":342659,"journal":{"name":"26th IEEE Vehicular Technology Conference","volume":"52 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1976-03-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124345643","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}
Pub Date : 1976-03-24DOI: 10.1109/VTC.1976.1622333
E. Schimmel, C. Snell
An examination of land mobile frequency coordination practices points up the fact that the FCC has been far more aggressive and innovative than the private sector. In addition to discussing some cause and effect implications of these respective actions and inactions, this paper describes a practical mini-computer system which one user organization has attempted to develop as a means of demonstrating the viability of self-regulation, by the private land mobile community, of the frequency management function.
{"title":"Mini computer support for mobile services frequency coordination","authors":"E. Schimmel, C. Snell","doi":"10.1109/VTC.1976.1622333","DOIUrl":"https://doi.org/10.1109/VTC.1976.1622333","url":null,"abstract":"An examination of land mobile frequency coordination practices points up the fact that the FCC has been far more aggressive and innovative than the private sector. In addition to discussing some cause and effect implications of these respective actions and inactions, this paper describes a practical mini-computer system which one user organization has attempted to develop as a means of demonstrating the viability of self-regulation, by the private land mobile community, of the frequency management function.","PeriodicalId":342659,"journal":{"name":"26th IEEE Vehicular Technology Conference","volume":"203 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1976-03-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131919007","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}
Pub Date : 1976-03-24DOI: 10.1109/VTC.1976.1622343
L. L. Taylor
{"title":"Design of a comprehensive state police radio system","authors":"L. L. Taylor","doi":"10.1109/VTC.1976.1622343","DOIUrl":"https://doi.org/10.1109/VTC.1976.1622343","url":null,"abstract":"","PeriodicalId":342659,"journal":{"name":"26th IEEE Vehicular Technology Conference","volume":"648 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1976-03-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132961491","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}
Pub Date : 1976-03-24DOI: 10.1109/VTC.1976.1622332
C. A. Rypinski
Increased use of radio channels is possible if fraction-of-a-second data messages are used to replace voice identification now used operationally and to satisfy FCC procedural rules. Recently developed equipment for the ATIS function is simple, reliable and low cost, so that it can be considered for universal use. The modulation, coding and circuit design technique used will be described as well as some applications and experimental results. This work is related to universal ATIS as explored in FCC Docket No. 20351, and comments will be offered on maximization of user benefits which might result from adoption of appropriate ATIS technical standards.
{"title":"Equipment for an automatic transmitter identification system (ATIS)","authors":"C. A. Rypinski","doi":"10.1109/VTC.1976.1622332","DOIUrl":"https://doi.org/10.1109/VTC.1976.1622332","url":null,"abstract":"Increased use of radio channels is possible if fraction-of-a-second data messages are used to replace voice identification now used operationally and to satisfy FCC procedural rules. Recently developed equipment for the ATIS function is simple, reliable and low cost, so that it can be considered for universal use. The modulation, coding and circuit design technique used will be described as well as some applications and experimental results. This work is related to universal ATIS as explored in FCC Docket No. 20351, and comments will be offered on maximization of user benefits which might result from adoption of appropriate ATIS technical standards.","PeriodicalId":342659,"journal":{"name":"26th IEEE Vehicular Technology Conference","volume":"37 3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1976-03-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133839052","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}
Pub Date : 1976-03-24DOI: 10.1109/VTC.1976.1622314
R. L. Lagace, H. Pastan
This paper compares public mobile telephone systems world-wide, encompassing key radio and operational characteristics on both the overall system and mobile unit levels. The comparisons also include the status of evolutionary development regarding degree of automation, number of subscribers, geographic availability of service, mobile unit costs, and major developments anticipated in the technological upgrading and physical expansion of services.
{"title":"Public mobile telephone—A comparative analysis of systems worldwide","authors":"R. L. Lagace, H. Pastan","doi":"10.1109/VTC.1976.1622314","DOIUrl":"https://doi.org/10.1109/VTC.1976.1622314","url":null,"abstract":"This paper compares public mobile telephone systems world-wide, encompassing key radio and operational characteristics on both the overall system and mobile unit levels. The comparisons also include the status of evolutionary development regarding degree of automation, number of subscribers, geographic availability of service, mobile unit costs, and major developments anticipated in the technological upgrading and physical expansion of services.","PeriodicalId":342659,"journal":{"name":"26th IEEE Vehicular Technology Conference","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1976-03-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122515097","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}
Pub Date : 1976-03-24DOI: 10.1109/VTC.1976.1622324
F. Adachi, T. Hattori, K. Hirade, T. Kamata
This paper describes a new simple switching-diversity technique without level detection. It adopts such method as to receive alternatively two RF signals received from different antenna branches at an adequate frequency. A few experimental tests have proved that this technique gives a significant improvement in signal transmission performance under the simulated Rayleigh fading channel at 900 MHz band.
{"title":"A new simple switching-diversity technique for digital land mobile radio","authors":"F. Adachi, T. Hattori, K. Hirade, T. Kamata","doi":"10.1109/VTC.1976.1622324","DOIUrl":"https://doi.org/10.1109/VTC.1976.1622324","url":null,"abstract":"This paper describes a new simple switching-diversity technique without level detection. It adopts such method as to receive alternatively two RF signals received from different antenna branches at an adequate frequency. A few experimental tests have proved that this technique gives a significant improvement in signal transmission performance under the simulated Rayleigh fading channel at 900 MHz band.","PeriodicalId":342659,"journal":{"name":"26th IEEE Vehicular Technology Conference","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1976-03-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126343199","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}
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