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

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Improved efficiency CDMA by constant envelope SQAM 采用恒包络SQAM提高CDMA效率
[1992 Proceedings] Vehicular Technology Society 42nd VTS Conference - Frontiers of Technology Pub Date : 1992-05-10 DOI: 10.1109/VETEC.1992.245399
Z. Wan, K. Feher
{"title":"Improved efficiency CDMA by constant envelope SQAM","authors":"Z. Wan, K. Feher","doi":"10.1109/VETEC.1992.245399","DOIUrl":"https://doi.org/10.1109/VETEC.1992.245399","url":null,"abstract":"In order to reduce the interference into the adjacent channel and to increase the processing gain of the CDMA system, a power and spectral efficient superposed-quadrature-amplitude-modulation code-division-multiple-access (SQAM-CDMA) system is proposed. In the hard-limited power amplified channel, SQAM-CDMA has about 12-16 dB lower out-of-band power interference into the adjacent channel than that of QPSK-CDMA, and 11-15 dB lower than that of BPSK-CDMA. Assuming a 30 dB lower out-of-band interference power is required in a given RF bandwidth, the processing gain of SQAM-CDMA is increased by 7 dB over QPSK-CDMA and 9.5 dB over BPSK-CDMA in the hard-limited amplified channel.<<ETX>>","PeriodicalId":114705,"journal":{"name":"[1992 Proceedings] Vehicular Technology Society 42nd VTS Conference - Frontiers of Technology","volume":"8 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":"123630639","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: 10
A new frequency agile transmitter combining system for North American cellular 一种新的北美蜂窝频率捷变发射机组合系统
[1992 Proceedings] Vehicular Technology Society 42nd VTS Conference - Frontiers of Technology Pub Date : 1992-05-10 DOI: 10.1109/VETEC.1992.245252
P. W. Arnold, K. Seymour
{"title":"A new frequency agile transmitter combining system for North American cellular","authors":"P. W. Arnold, K. Seymour","doi":"10.1109/VETEC.1992.245252","DOIUrl":"https://doi.org/10.1109/VETEC.1992.245252","url":null,"abstract":"A totally passive yet frequency-agile transmitter combining system is described, which allows each site transmitter to shift to any of the frequencies within its frequency windows, thus allowing instantaneous selection of any of the 416 frequencies within a 12.5-MHz frequency allocation. The system is described and compared with available alternatives with respect to frequency agility, selectivity, DC to RF efficiency, intermodulation rejection, space utilization, and initial cost. Field testing in a nonwireline system in Portland, OR, USA is described, and the adaptability of the system to present and future frequency planning is discussed.<<ETX>>","PeriodicalId":114705,"journal":{"name":"[1992 Proceedings] Vehicular Technology Society 42nd VTS Conference - Frontiers of Technology","volume":"88 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":"121773775","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
Capacity increase of a CDMA cellular system by using directional antennas on mobile stations 在移动台使用定向天线增加CDMA蜂窝系统的容量
[1992 Proceedings] Vehicular Technology Society 42nd VTS Conference - Frontiers of Technology Pub Date : 1992-05-10 DOI: 10.1109/VETEC.1992.245260
Jae Hong Lee
{"title":"Capacity increase of a CDMA cellular system by using directional antennas on mobile stations","authors":"Jae Hong Lee","doi":"10.1109/VETEC.1992.245260","DOIUrl":"https://doi.org/10.1109/VETEC.1992.245260","url":null,"abstract":"It is shown that the capacities of both the reverse link and the forward link of a code division multiple access (CDMA) cellular system are increased significantly by using a steerable directional antenna on a mobile station. The additional cost for a directional antenna must be taken into consideration for implementation. It is shown that the interference from signals originating beyond the first two cell rings is not negligible for both the reverse link and the forward link.<<ETX>>","PeriodicalId":114705,"journal":{"name":"[1992 Proceedings] Vehicular Technology Society 42nd VTS Conference - Frontiers of Technology","volume":"19 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":"121853951","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
Data transmission characteristics in short range inter-vehicle communication system (IVCS) 近程车辆间通信系统(IVCS)数据传输特性
[1992 Proceedings] Vehicular Technology Society 42nd VTS Conference - Frontiers of Technology Pub Date : 1992-05-10 DOI: 10.1109/VETEC.1992.245418
W. Kremer
{"title":"Data transmission characteristics in short range inter-vehicle communication system (IVCS)","authors":"W. Kremer","doi":"10.1109/VETEC.1992.245418","DOIUrl":"https://doi.org/10.1109/VETEC.1992.245418","url":null,"abstract":"The author deals with the data transmission characteristics of a previously presented short-range intervehicle communication system The quality of the microwave communication channel is characterized by the fact that both, sender and receiver are in motion. The communication link is modeled theoretically by the prediction of expected signal-to-noise ratio (SNR) which is determined by two factors, the sender-receiver distance and the fading phenomenon. The characteristics of that channel are examined and selected FEC-coding techniques are applied, including BCH, burst, Reed-Solomon, and convolutional codes each with different code rates. It is shown that FEC codes gain improvements of the channel, without significant differences between various code rates. The Viterbi algorithm for convolutional codes shows the best improvement of the transmission capability, even with low coding overhead.<<ETX>>","PeriodicalId":114705,"journal":{"name":"[1992 Proceedings] Vehicular Technology Society 42nd VTS Conference - Frontiers of Technology","volume":"68 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":"126339262","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
Capacity of TDMA digital cellular communication system TDMA数字蜂窝通信系统的容量
[1992 Proceedings] Vehicular Technology Society 42nd VTS Conference - Frontiers of Technology Pub Date : 1992-05-10 DOI: 10.1109/VETEC.1992.245243
E. Sourour
{"title":"Capacity of TDMA digital cellular communication system","authors":"E. Sourour","doi":"10.1109/VETEC.1992.245243","DOIUrl":"https://doi.org/10.1109/VETEC.1992.245243","url":null,"abstract":"The evaluation of system capacity in Erlangs, based on the North American digital time division multiple access (TDMA) standards, is addressed. A Monte Carlo simulation study of two different frequency plans, namely, seven-cell clusters with three sectors/cell and four-cell clusters with six sectors/cell is presented. Cells are assumed to be equal in radius and the user density is assumed to be uniformly distributed among the cells. In the forward carrier (base station to mobile unit) a mobile unit is allowed to move uniformly in a target sector and the carrier to cochannel interference ratio from all cochannel base stations is evaluated at every location of the target mobile unit. The Erlang load versus the blocking probability is evaluated. The effect of the TDMA time slot assignment technique when a mobile unit requests service, is studied. The propagation path loss is assumed to be proportional to r/sup -n/ with log-normal shadowing.<<ETX>>","PeriodicalId":114705,"journal":{"name":"[1992 Proceedings] Vehicular Technology Society 42nd VTS Conference - Frontiers of Technology","volume":"84 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":"128250931","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
Throughput analysis of multichannel slotted ALOHA systems in multiple log-normal and Rayleigh interferers environment 多重对数正态和瑞利干扰环境下多通道开槽ALOHA系统的吞吐量分析
[1992 Proceedings] Vehicular Technology Society 42nd VTS Conference - Frontiers of Technology Pub Date : 1992-05-10 DOI: 10.1109/VETEC.1992.245398
Z. Zhang, Y. Liu
{"title":"Throughput analysis of multichannel slotted ALOHA systems in multiple log-normal and Rayleigh interferers environment","authors":"Z. Zhang, Y. Liu","doi":"10.1109/VETEC.1992.245398","DOIUrl":"https://doi.org/10.1109/VETEC.1992.245398","url":null,"abstract":"The performance of a multichannel slotted Aloha system in a multiple log-normal Rayleigh interferers environment is investigated. A Markov model is used to obtain the system throughput and average packet delay. The throughput of such a slotted multichannel Aloha system with capture is found to be much higher than without capture. Numerical results show that the capture effect is not sensitive to Rayleigh fading for a given receiver sensitivity. The results also indicate that reducing the receiver sensitivity or capture ratio is one way to improve the overall performance of an Aloha network in land mobile radio communication environment.<<ETX>>","PeriodicalId":114705,"journal":{"name":"[1992 Proceedings] Vehicular Technology Society 42nd VTS Conference - Frontiers of Technology","volume":"28 48","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1992-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120835602","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: 11
Propagation modeling and measurements in an urban and suburban environment using broadband direct sequence spread spectrum 利用宽带直接序列扩频在城市和郊区环境中的传播建模和测量
[1992 Proceedings] Vehicular Technology Society 42nd VTS Conference - Frontiers of Technology Pub Date : 1992-05-10 DOI: 10.1109/VETEC.1992.245414
V. Erceg, D. Schilling, S. Ghassemzadeh, D. Li, M. Taylor
{"title":"Propagation modeling and measurements in an urban and suburban environment using broadband direct sequence spread spectrum","authors":"V. Erceg, D. Schilling, S. Ghassemzadeh, D. Li, M. Taylor","doi":"10.1109/VETEC.1992.245414","DOIUrl":"https://doi.org/10.1109/VETEC.1992.245414","url":null,"abstract":"Due to the increasing demand for mobile communications, it has been suggested that microcellular high-capacity personal communications networks (PCN) be established in the 2-GHz band using broadband spread-spectrum code-division multiple access communications systems. A theoretical model is developed for out-of-sight propagation in the 2-GHz band using different heights and locations of the transmitting antenna. The theory was verified by experimental results taken in New York City and Long Island areas, using the antenna heights which were less than the heights of the surrounding buildings. The path loss along the out-of-sight street was found to have two distinct characteristics: the first is a sudden power level drop (corner attenuation), and the second is a different slope (attenuation vs. distance) which follows the sudden corner attenuation. Both the theoretical model and the experimental data are presented.<<ETX>>","PeriodicalId":114705,"journal":{"name":"[1992 Proceedings] Vehicular Technology Society 42nd VTS Conference - Frontiers of Technology","volume":"26 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":"120986462","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
Error rate analysis for indoor wireless networks 室内无线网络错误率分析
[1992 Proceedings] Vehicular Technology Society 42nd VTS Conference - Frontiers of Technology Pub Date : 1992-05-10 DOI: 10.1109/VETEC.1992.245302
Andrew R Nix, G. H. Norton, J. Mcgeehan
{"title":"Error rate analysis for indoor wireless networks","authors":"Andrew R Nix, G. H. Norton, J. Mcgeehan","doi":"10.1109/VETEC.1992.245302","DOIUrl":"https://doi.org/10.1109/VETEC.1992.245302","url":null,"abstract":"An attempt is made to predict the maximum data rates for a typical wireless computer network operating in an indoor frequency-selective environment. To lower the error rates for high-speed data transmission, the impact of techniques such as diversity combining, frequency hopping, and pulse shaping is investigated.<<ETX>>","PeriodicalId":114705,"journal":{"name":"[1992 Proceedings] Vehicular Technology Society 42nd VTS Conference - Frontiers of Technology","volume":"55 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":"129598615","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
Propagation into and within buildings at 900, 1800 and 2300 MHz 900、1800和2300兆赫的建筑物内和建筑物内的传播
[1992 Proceedings] Vehicular Technology Society 42nd VTS Conference - Frontiers of Technology Pub Date : 1992-05-10 DOI: 10.1109/VETEC.1992.245316
A. de Toledo, A. Turkmani
{"title":"Propagation into and within buildings at 900, 1800 and 2300 MHz","authors":"A. de Toledo, A. Turkmani","doi":"10.1109/VETEC.1992.245316","DOIUrl":"https://doi.org/10.1109/VETEC.1992.245316","url":null,"abstract":"Investigations of propagation into, and within, buildings at 900, 1800, and 2100 MHz were undertaken. The composite Rayleigh-plus-log-normal distribution successfully modeled the measured cumulative distributions of all measurements. The average measured penetration loss at ground floor level was found to be 14.2, 13.4, and 12.8 dB, respectively, at 900, 1800, and 2300 MHz. The rate of change of penetration loss with height was-1.4, dB per floor. The rate of change of mean signal level for signals traveling within buildings was, on average, 8.5 dB per floor. the path loss attenuation factor, that best modeled the within-building measurement was found to be 5.3, 5.5, and 6.0, respectively, for 900, 1800, and 2300 MHz.<<ETX>>","PeriodicalId":114705,"journal":{"name":"[1992 Proceedings] Vehicular Technology Society 42nd VTS Conference - Frontiers of Technology","volume":"64 Suppl 3 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":"130311972","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: 69
ASIC receiver for the Pan European digital cellular telephone (GSM) 泛欧数字蜂窝电话(GSM)专用集成电路接收机
[1992 Proceedings] Vehicular Technology Society 42nd VTS Conference - Frontiers of Technology Pub Date : 1992-05-10 DOI: 10.1109/VETEC.1992.245277
A. Spielberg, J. Stahl, Tim Pagden
{"title":"ASIC receiver for the Pan European digital cellular telephone (GSM)","authors":"A. Spielberg, J. Stahl, Tim Pagden","doi":"10.1109/VETEC.1992.245277","DOIUrl":"https://doi.org/10.1109/VETEC.1992.245277","url":null,"abstract":"In digital mobile radio, adaptive Viterbi equalizers are used to overcome radio transmission problems caused by multipath fading. Optimum equalizer performance is required to meet the GSM recommendations. On the other hand, the implementation should be minimal in terms of cost, size, and power consumption. These conflicting requirements are solved best by the use of an ASIC. Since the performance of the ASIC-based system must be guaranteed before fabrication, using CAD tools for VLSI design alone is not sufficient. By using a state-of-the-art system simulation tool the complete GSM physical layer was simulated. After optimization of the equalizer algorithm with the help of system simulation, the VLSI design was carried out using a bit-level correspondence between the high-level description (HDL) and system simulator model. From the HDL description the silicon was automatically synthesized.<<ETX>>","PeriodicalId":114705,"journal":{"name":"[1992 Proceedings] Vehicular Technology Society 42nd VTS Conference - Frontiers of Technology","volume":"1 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":"128221463","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
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