Pub Date : 1984-05-21DOI: 10.1109/VTC.1984.1623247
C. R. Stevenson
An improved modulation, demodulation and signal processing scheme for Amplitude-Compandored Single Sideband (ACSB) systems will be described, which offers correction for the adverse effects of the rapid fading characteristic of the mobile environment, reduces the possibility of adjacent channel interference, and is suitable for use in either satellite-aided or terrestrial mobile communications systems operating well into the UHF region. Furthermore, it lends itself very well to an almost completely digital implementation, eliminates the requirement for costly and bulky SSB IF crystal filters, and should significantly reduce the size and cost of ACSB mobile equipment utilizing the technique.
{"title":"An improved modulation format and signal processing scheme for ACSB systems","authors":"C. R. Stevenson","doi":"10.1109/VTC.1984.1623247","DOIUrl":"https://doi.org/10.1109/VTC.1984.1623247","url":null,"abstract":"An improved modulation, demodulation and signal processing scheme for Amplitude-Compandored Single Sideband (ACSB) systems will be described, which offers correction for the adverse effects of the rapid fading characteristic of the mobile environment, reduces the possibility of adjacent channel interference, and is suitable for use in either satellite-aided or terrestrial mobile communications systems operating well into the UHF region. Furthermore, it lends itself very well to an almost completely digital implementation, eliminates the requirement for costly and bulky SSB IF crystal filters, and should significantly reduce the size and cost of ACSB mobile equipment utilizing the technique.","PeriodicalId":178210,"journal":{"name":"34th IEEE Vehicular Technology Conference","volume":"09 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1984-05-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127217080","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 : 1984-05-21DOI: 10.1109/VTC.1984.1623229
W. Schmidt
The Mobile Automatic Telephone System EC 900 is a high-capacity cellular system developed for operation in the CEPT 900 MHz-band. This contribution concentrates on the so-called "radio interface", i.e. signalling and protocols used on the radio path between mobile and fixed stations. In particular, the access, paging, and broadcast Functions handled on common control channels are explained in detail, which allow the implementation of off-air call set-up and call queueing in order to increase spectrum efficiency. Results of detailed system simulations are used to demonstrate system performance.
{"title":"Protocol design of the EC 900 cellular radio system","authors":"W. Schmidt","doi":"10.1109/VTC.1984.1623229","DOIUrl":"https://doi.org/10.1109/VTC.1984.1623229","url":null,"abstract":"The Mobile Automatic Telephone System EC 900 is a high-capacity cellular system developed for operation in the CEPT 900 MHz-band. This contribution concentrates on the so-called \"radio interface\", i.e. signalling and protocols used on the radio path between mobile and fixed stations. In particular, the access, paging, and broadcast Functions handled on common control channels are explained in detail, which allow the implementation of off-air call set-up and call queueing in order to increase spectrum efficiency. Results of detailed system simulations are used to demonstrate system performance.","PeriodicalId":178210,"journal":{"name":"34th IEEE Vehicular Technology Conference","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1984-05-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126851602","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 : 1984-05-21DOI: 10.1109/VTC.1984.1623251
S. Carney
The bit error rate (BER) performance of a Narrowband Frequency Shift Keyed (FSK) data transmission system is examined under co-channel interference conditions. Bit error rate data is presented as a function of carrier-to-interference (C/I) ratio for both static and simulated Rayleigh fading signals. Gaussian baseband premodulation data filtering is used in the FSK transmitter. The receiver has a 2.4 kHz bandwidth and discriminator detection. Methods of testing are described. Voice intelligibility of the Linear Predictive Coded (LPC) Speech is compared to that of a conventional 5 kHz deviation FM receiver for various C/I ratios. An equivalent audio tone-to-interference ratio (T/I) was determined for the Narrowband LPC/FSK system by comparing BER data and C/I measurements to FM audio T/I and C/I data. Rayleigh fading C/I performance is also compared.
{"title":"Co-channel interference comparison for conventional land mobile frequency modulation and 2400 BPS LPC/FSK system","authors":"S. Carney","doi":"10.1109/VTC.1984.1623251","DOIUrl":"https://doi.org/10.1109/VTC.1984.1623251","url":null,"abstract":"The bit error rate (BER) performance of a Narrowband Frequency Shift Keyed (FSK) data transmission system is examined under co-channel interference conditions. Bit error rate data is presented as a function of carrier-to-interference (C/I) ratio for both static and simulated Rayleigh fading signals. Gaussian baseband premodulation data filtering is used in the FSK transmitter. The receiver has a 2.4 kHz bandwidth and discriminator detection. Methods of testing are described. Voice intelligibility of the Linear Predictive Coded (LPC) Speech is compared to that of a conventional 5 kHz deviation FM receiver for various C/I ratios. An equivalent audio tone-to-interference ratio (T/I) was determined for the Narrowband LPC/FSK system by comparing BER data and C/I measurements to FM audio T/I and C/I data. Rayleigh fading C/I performance is also compared.","PeriodicalId":178210,"journal":{"name":"34th IEEE Vehicular Technology Conference","volume":"54 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1984-05-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116452722","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 : 1984-05-21DOI: 10.1109/VTC.1984.1623266
S. Lakhavani, G. Dawson
This paper presents the formulation of a coupled circuit model for the linear synchronous machine (LSM) and the derivation of the non-linear state variable equations which describe the electrical and mechanical behavior of the linear synchronous motor. A force angle, B, is defined for steady state and transient operation and techniques to control B by controlling the voltage magnitude are presented. The control scheme provides system damping and operation at values of β that are normally unstable. Computational results are presented for uncontrolled and controlled operation of a model.
{"title":"Study of a linear synchronous motor for high speed transport applications","authors":"S. Lakhavani, G. Dawson","doi":"10.1109/VTC.1984.1623266","DOIUrl":"https://doi.org/10.1109/VTC.1984.1623266","url":null,"abstract":"This paper presents the formulation of a coupled circuit model for the linear synchronous machine (LSM) and the derivation of the non-linear state variable equations which describe the electrical and mechanical behavior of the linear synchronous motor. A force angle, B, is defined for steady state and transient operation and techniques to control B by controlling the voltage magnitude are presented. The control scheme provides system damping and operation at values of β that are normally unstable. Computational results are presented for uncontrolled and controlled operation of a model.","PeriodicalId":178210,"journal":{"name":"34th IEEE Vehicular Technology Conference","volume":"150 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1984-05-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122759184","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 : 1984-05-21DOI: 10.1109/VTC.1984.1623273
C. Lowder
The Bay Area Rapid Transit District (BART), as part of its overall service improvement program, is implementing a highly flexible turnback complex at its Daly City terminal station. When BART completes this facility and has put its new "C" cars (which can function as front, rear, or mid-train cars) into service, one of the operational functions in the turnback area will be the break-up and make-up of trains. In order to facilitate this make-up/ break-up process and to minimize the amount of train radio traffic, a control system is being designed that will assist in the automatic routing of trains and assigning of speed codes in the turnback area. This new system will utilize existing BART control concepts and equipment as well as upgraded and modified equipment.
{"title":"Automatic control for making and breaking trains bay area rapid transit system","authors":"C. Lowder","doi":"10.1109/VTC.1984.1623273","DOIUrl":"https://doi.org/10.1109/VTC.1984.1623273","url":null,"abstract":"The Bay Area Rapid Transit District (BART), as part of its overall service improvement program, is implementing a highly flexible turnback complex at its Daly City terminal station. When BART completes this facility and has put its new \"C\" cars (which can function as front, rear, or mid-train cars) into service, one of the operational functions in the turnback area will be the break-up and make-up of trains. In order to facilitate this make-up/ break-up process and to minimize the amount of train radio traffic, a control system is being designed that will assist in the automatic routing of trains and assigning of speed codes in the turnback area. This new system will utilize existing BART control concepts and equipment as well as upgraded and modified equipment.","PeriodicalId":178210,"journal":{"name":"34th IEEE Vehicular Technology Conference","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1984-05-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123960806","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 : 1984-05-21DOI: 10.1109/VTC.1984.1623276
R. Janc
An Automatic Vehicle Location (AVL) system utilizing LORAN-C which has been cost-optimized is described. The various sources of positioning errors are enumerated and their effects are quantified through theoretical and empirical techniques. These results are used to generate a performance specification for the continental U.S. This specification is compared to field test results from two operating demonstration systems.
{"title":"Consideration of the various error sources in a practical automatic vehicle location system","authors":"R. Janc","doi":"10.1109/VTC.1984.1623276","DOIUrl":"https://doi.org/10.1109/VTC.1984.1623276","url":null,"abstract":"An Automatic Vehicle Location (AVL) system utilizing LORAN-C which has been cost-optimized is described. The various sources of positioning errors are enumerated and their effects are quantified through theoretical and empirical techniques. These results are used to generate a performance specification for the continental U.S. This specification is compared to field test results from two operating demonstration systems.","PeriodicalId":178210,"journal":{"name":"34th IEEE Vehicular Technology Conference","volume":"45 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1984-05-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121176866","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 : 1984-05-21DOI: 10.1109/VTC.1984.1623235
R.T. Forrest
A propagation measurement program conducted at 800 MHz in the Pittsburgh area is described. Although the purpose of the test was to obtain data to be used in a specific system design, much of what was learned is applicable to designs in other locations. The data reduction procedure is presented, wlth the primary emphasls on the design of the Pittsburgh system. Data and conclusions in the areas of diversity improvement, tower shadowing, tunnel communications, and short-term fading characteristics are presented and discussed.
{"title":"800 MHz mobile radio propagation tests in the Pittsburgh area","authors":"R.T. Forrest","doi":"10.1109/VTC.1984.1623235","DOIUrl":"https://doi.org/10.1109/VTC.1984.1623235","url":null,"abstract":"A propagation measurement program conducted at 800 MHz in the Pittsburgh area is described. Although the purpose of the test was to obtain data to be used in a specific system design, much of what was learned is applicable to designs in other locations. The data reduction procedure is presented, wlth the primary emphasls on the design of the Pittsburgh system. Data and conclusions in the areas of diversity improvement, tower shadowing, tunnel communications, and short-term fading characteristics are presented and discussed.","PeriodicalId":178210,"journal":{"name":"34th IEEE Vehicular Technology Conference","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1984-05-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126376453","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 : 1984-05-21DOI: 10.1109/VTC.1984.1623256
S. Halpern
System design alternatives for serving low-power hand-held portable radiotelephones in cellular systems are explored. Two popular designs are considered for systems with little or no frequency reuse. In one design, omnidirectional antennas are used with full-coverage space diversity and receivers with high sensitivity. In the other design, 60-degree sector receive antennas are used with sectorized space diversity. Although both designs are able to compensate for the low radiated power (0.6 watts) of hand-held portables, the more complex sectorized scheme shows somewhat greater variability in service quality because it combines signals from antennas looking into different sectors. With both methods, quality in the portable-to-land direction will generally be better than quality in the land-to-portable direction despite the low radiated power of the portable. The major difficulty with serving portables in systems that have significant frequency reuse is co-channel interference. Cell sectorization, RF power balancing, and dynamic RF power control are needed to control interference and allow portables and vehicular mobiles to operate on the same set of channels. Diversity combining arrangements at the cell site that provide full diversity coverage over the serving sector (i.e., two antennas per sector) offer better protection against interference than do those that combine signals coming from antennas that are looking into different sectors. With the latter arrangement, the full benefit of cell sectorization cannot be realized since the cell-site receiver is susceptible to interference coming into adjacent sector antennas as well as interference coming into the serving sector antenna.
{"title":"Alternatives in cellular system design for serving portables","authors":"S. Halpern","doi":"10.1109/VTC.1984.1623256","DOIUrl":"https://doi.org/10.1109/VTC.1984.1623256","url":null,"abstract":"System design alternatives for serving low-power hand-held portable radiotelephones in cellular systems are explored. Two popular designs are considered for systems with little or no frequency reuse. In one design, omnidirectional antennas are used with full-coverage space diversity and receivers with high sensitivity. In the other design, 60-degree sector receive antennas are used with sectorized space diversity. Although both designs are able to compensate for the low radiated power (0.6 watts) of hand-held portables, the more complex sectorized scheme shows somewhat greater variability in service quality because it combines signals from antennas looking into different sectors. With both methods, quality in the portable-to-land direction will generally be better than quality in the land-to-portable direction despite the low radiated power of the portable. The major difficulty with serving portables in systems that have significant frequency reuse is co-channel interference. Cell sectorization, RF power balancing, and dynamic RF power control are needed to control interference and allow portables and vehicular mobiles to operate on the same set of channels. Diversity combining arrangements at the cell site that provide full diversity coverage over the serving sector (i.e., two antennas per sector) offer better protection against interference than do those that combine signals coming from antennas that are looking into different sectors. With the latter arrangement, the full benefit of cell sectorization cannot be realized since the cell-site receiver is susceptible to interference coming into adjacent sector antennas as well as interference coming into the serving sector antenna.","PeriodicalId":178210,"journal":{"name":"34th IEEE Vehicular Technology Conference","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1984-05-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126223682","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 : 1984-05-21DOI: 10.1109/VTC.1984.1623255
R. J. Pillmeier
Results of an experiment to determine the characteristics of In-Building Signal Correlation for an Urban Environment are presented. The experiment was conducted in the Newark, New Jersey urban environment with a system that emulated a small-cell noise-limited cellular system. Signal sources were provided by the three separate cell-sites that might serve this urban area. Five buildings Were explored with measurements being made on three floors of each building representing low, medium, and high locations within the building. Results of these measurements are presented which include a typical building penetration loss relative to an outside reference, as well as, a typical gain in signal level per floor.
{"title":"In-building signal correlation for an urban environment","authors":"R. J. Pillmeier","doi":"10.1109/VTC.1984.1623255","DOIUrl":"https://doi.org/10.1109/VTC.1984.1623255","url":null,"abstract":"Results of an experiment to determine the characteristics of In-Building Signal Correlation for an Urban Environment are presented. The experiment was conducted in the Newark, New Jersey urban environment with a system that emulated a small-cell noise-limited cellular system. Signal sources were provided by the three separate cell-sites that might serve this urban area. Five buildings Were explored with measurements being made on three floors of each building representing low, medium, and high locations within the building. Results of these measurements are presented which include a typical building penetration loss relative to an outside reference, as well as, a typical gain in signal level per floor.","PeriodicalId":178210,"journal":{"name":"34th IEEE Vehicular Technology Conference","volume":"34 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1984-05-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130791904","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 : 1984-05-21DOI: 10.1109/VTC.1984.1623254
G. Schrenk
Cellular radio systems are a sophisticated application of trunked mobile radio technology in which the range of the base station transmitters are interference limited from co-channel reuse of frequencies instead of being noise limited. Accordingly, effective design of these systems requires an understanding of co-channel interference and its impact on coverage range as the cellular system designer must "manage" interference rather than avoid it. This paper develops a statistical method for determining the coverage range of transmitters in a mobile system, both in the absence and presence of co-channel interference. Two basic methods are examined and compared for defining and determining the reliability of reception in cellular systems--namely, the probability of reception along a contour boundary and the average probability of reception within a contour. The basic 12-cell and 7-cell omnidirectional systems are analyzed under both methods. Examples are presented that enable a quantitative comparison of these two basic methods and associated design criteria.
{"title":"Interference management in cellular system design","authors":"G. Schrenk","doi":"10.1109/VTC.1984.1623254","DOIUrl":"https://doi.org/10.1109/VTC.1984.1623254","url":null,"abstract":"Cellular radio systems are a sophisticated application of trunked mobile radio technology in which the range of the base station transmitters are interference limited from co-channel reuse of frequencies instead of being noise limited. Accordingly, effective design of these systems requires an understanding of co-channel interference and its impact on coverage range as the cellular system designer must \"manage\" interference rather than avoid it. This paper develops a statistical method for determining the coverage range of transmitters in a mobile system, both in the absence and presence of co-channel interference. Two basic methods are examined and compared for defining and determining the reliability of reception in cellular systems--namely, the probability of reception along a contour boundary and the average probability of reception within a contour. The basic 12-cell and 7-cell omnidirectional systems are analyzed under both methods. Examples are presented that enable a quantitative comparison of these two basic methods and associated design criteria.","PeriodicalId":178210,"journal":{"name":"34th IEEE Vehicular Technology Conference","volume":"50 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1984-05-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122196375","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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