27th IEEE Vehicular Technology Conference最新文献

{"title":"Word synchronization and digital signal processing for a high capacity mobile telecommunications system","authors":"E. Addeo","doi":"10.1109/VTC.1977.1622426","DOIUrl":"https://doi.org/10.1109/VTC.1977.1622426","url":null,"abstract":"In the BTL developed High Capacity Mobile Telecommunications System a 10K bit/sec digital signaling system is used to provide information needed in the various stages of call set-up and control. This paper focuses particular attention on the word-sync reliability problem for data-burst signaling as used to provide channel designations for cell-to-cell handoffs. It is shown that a simple quasi-static model of the Rayleigh fading carrier can be used to predict miss and false response rates of a Barker framing sequence. Also, it is shown that by appropriately processing word-sync information, three orders improvement in the false response rates can be routinely achieved.","PeriodicalId":105804,"journal":{"name":"27th IEEE Vehicular Technology Conference","volume":"79 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1977-03-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128210810","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}

{"title":"Communications options for computerized traffic control systems","authors":"H. Volk","doi":"10.1109/VTC.1977.1622432","DOIUrl":"https://doi.org/10.1109/VTC.1977.1622432","url":null,"abstract":"This paper describes the current state of the art in communications technologies, as it applies to computerized traffic control systems. It analyzes the problems and tradeoffs required to achieve an optimal communications system linking the central processor to individual intersections of a CBD grid system as well as distributed stations along a freeway system. This report is based on a combination of analytical and practical experience gained in designing, developing, and implementing traffic control communications systems in both North America and Europe during the past 3 years.","PeriodicalId":105804,"journal":{"name":"27th IEEE Vehicular Technology Conference","volume":"40 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1977-03-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124374669","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}

{"title":"A new UHF autotune communications system for ships","authors":"A. H. Secord, A. Alden, J. Whittaker","doi":"10.1109/VTC.1977.1622451","DOIUrl":"https://doi.org/10.1109/VTC.1977.1622451","url":null,"abstract":"A UHF radio system for ship-to-ship and ship-to-aircraft communications has been designed for the Canadian Armed Forces. It is automatically tunable to any of 7,000 channels spaced at 25 KHz intervals from 225 MHz to 400 MHz. Each ship is capable of operating 9 simultaneous links in the simplex mode for plain speech, teletype, digital data or secure speech. This is accomplished using 9 transceivers on each ship feeding into separate multicoupler (band-pass filters) and antenna subsystems for the transmit and receive functions. New techniques of system construction allow the transmitters to operate on \"adjacent\" channels at frequency separations down to 600 KHz and at the intermodulation frequencies of the same ship transmitters. Omni-directional coverage to the radio horizon has been achieved by making the common transmit and common receive antennas of a 'wrap-round' design. These design considerations may have application in the land mobile radio field for multitransmitter base station design.","PeriodicalId":105804,"journal":{"name":"27th IEEE Vehicular Technology Conference","volume":"211 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1977-03-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133512302","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}

{"title":"A description of the Bell system HCMTS cell-site radio and control hardware","authors":"R. E. Fisher","doi":"10.1109/VTC.1977.1622437","DOIUrl":"https://doi.org/10.1109/VTC.1977.1622437","url":null,"abstract":"Final planning and development is underway for a High Capacity Mobile Telecommunications System (HCMTS), a nationwide, compatible, cellular system that will permit a dramatic increase in the quantity of available mobile telephone service in the United States. In this cellular system the total coverage area is divided into a grid of small hexagonal cells. The radius of each cell is planned to be eight miles for startup systems, but might eventually shrink to one mile (by cell splitting) as traffic density increases. Mobiles located within the cells are serviced by low-power 850 MHz FM transceivers contained within cell-sites which are situated at alternate corners of each hexagonal cell. Two types of antennas may be used at a cell site. A startup system would employ omnidirectional antennas, since for this case traffic density is low and it is important to minimize first cost. Mature, high density systems, would employ three sets of directional antennas at alternate corners of each cell site, arranged such that the 120deg; beam from each antenna set would illuminate the interior of the corresponding cell. All cell sites are interfaced with one central control and switching center, the Mobile Telephone Switching Office (MTSO), by means of four-wire voice and data trunks. A call from the DDD telephone network is first routed to the MTSO, then over a voice trunk to the cell site which is to serve the mobile, and finally over an available radio channel to the called mobile. At call setup the mobile is located by measuring its received signal strength and range. During the call the mobile may be relocated several times a minute. If the mobile enters a new cell it is \"handed-off\" to a new cell site and radio channel by digital commands from the MTSO.","PeriodicalId":105804,"journal":{"name":"27th IEEE Vehicular Technology Conference","volume":"123 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1977-03-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127057285","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}

{"title":"A communication system custom designed for the Montreal metro rapid transit subway","authors":"E.R. Leech, W. T. Outlaw","doi":"10.1109/VTC.1977.1622433","DOIUrl":"https://doi.org/10.1109/VTC.1977.1622433","url":null,"abstract":"This paper discusses a custom radio communication system designed for the Montreal Metro rapid transit subway. This system utilizes radiating coaxial cable to provide communications between: (a) subway trains and the Control Center; (b) subway trains; (c) maintenance personnel with portable units and trains, other maintenance personnel, or to the Control Center; (d) the Control Center and passengers on a selected train.","PeriodicalId":105804,"journal":{"name":"27th IEEE Vehicular Technology Conference","volume":"78 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1977-03-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124549899","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}

{"title":"Developments in selective calling systems","authors":"G. W. Gurry","doi":"10.1109/VTC.1977.1622444","DOIUrl":"https://doi.org/10.1109/VTC.1977.1622444","url":null,"abstract":"This paper describes three monolithic encoder/ decoder integrated circuits for 5-tone mobile selective calling systems operating to European CCIR and ZVEI standards. Methods for code programming group calling and conditioned transponding are discussed. A new series of codec integrated circuits are also described, to be available in versions pre-programmed to the American EIA frequencies. These integrated circuits provide selective address, group call, all-call, ATI, status transponding and two way data signalling capabilities for fully integrated mobile-portable-paging communications systems.","PeriodicalId":105804,"journal":{"name":"27th IEEE Vehicular Technology Conference","volume":"72 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1977-03-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124992165","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}

{"title":"Improved data-collection method for mobile-radio planning and installation","authors":"P. Robertson, P. Girard, G. Missout","doi":"10.1109/VTC.1977.1622445","DOIUrl":"https://doi.org/10.1109/VTC.1977.1622445","url":null,"abstract":"The paper describes one of the stages in a mobile-radio planning project, namely the collection and processing of the data needed to plan and install a mobile-radio network. In view of the lack of accuracy of the usual data-collection method, an alternative solution has been devised based on a more efficient system, which should also contribute to better frequency-spectrum managment.","PeriodicalId":105804,"journal":{"name":"27th IEEE Vehicular Technology Conference","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1977-03-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127422192","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}

{"title":"On the use of 15 KHz tertiary channels in 150 MHz IMTS","authors":"G. A. Arredondo, D. Gunn","doi":"10.1109/VTC.1977.1622428","DOIUrl":"https://doi.org/10.1109/VTC.1977.1622428","url":null,"abstract":"The growth of the Land Mobile Radio Services has been so rapid that it has resulted in an ever increasing demand for additional channels. A channel split is an approach that nearly doubles the number of channels available. This paper presents the known factors that need to be considered in order to use channels spaced 15 kHz apart in IMTS systems where the current channel spacing is 30 kHz. One approach in using 15 kHz channels would be to replace all existing land and mobile equipment with new radios having narrower bandwidth and operating with lower frequency deviation. The approach considered here is economically more attractive. It makes use of current equipment with minor modifications, and retains the bandwidth and deviation in current use. The 15 kHz channels could be assigned to adjacent systems that could be located closer than co-channel systems, thereby providing some relief. Even greater relief is possible if the interstitial 15 KHz channels are operated at the same location as the current 30 KHz channels. The results presented here address this cosited case, but are applicable to adjacent systems as well. Consider first the base-to-mobile direction. In IMTS systems, a mobile unit scans through all equipped channels until it locks on the channel marked idle with a 2 kHz tone at full deviation (i.e., 5 kHz). The possibility exists that while scanning, the mobile unit may lock on the wrong channel by detecting the idle tone of an adjacent interstitial channel. It will be shown that the deviation of signaling tones may be reduced down to 2 kHz with no loss in signaling reliability. This lower deviation on idle tone, together with the current practice of transmitting an unmodulated low power carrier on channels not in use, essentially eliminates the false lock problem. The other problem in the base-to-mobile direction is the interference on a voice circuit produced by signaling tones or voice modulating the adjacent interstitial channel. It will be shown that the interfering signal must be 20 dB greater than the desired in order to seriously degrade a commercial call. By locating both transmitters together (not necessarily on the same antenna), the average power levels of the desired and interfering channels received at the mobile will be nearly equal regardless of the mobile's location. Thus, the interference to voice circuits in the base-to-mobile direction is not a serious problem. In the mobile-to-base direction, it is possible that the disconnect signal transmitted when a mobile terminates a call may be detected in a busy adjacent interstitial channel and falsely terminate the call on that channel. As with the \"false lock\" problem, this situation is alleviated by reducing the signaling deviation in the mobile. Since there may be many mobiles whose signaling deviations have not been reduced, say roamers, a modification can be made in the control terminal so that a test is made of the absence of RF carrier after detecting the disconnec","PeriodicalId":105804,"journal":{"name":"27th IEEE Vehicular Technology Conference","volume":"36 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131871026","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}