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

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A new carrier recovery circuit for mobile satellite communications 一种新型移动卫星通信载波恢复电路
[1992 Proceedings] Vehicular Technology Society 42nd VTS Conference - Frontiers of Technology Pub Date : 1992-05-10 DOI: 10.1109/VETEC.1992.245289
Y. Matsumoto, M. Morikura, S. Kato
{"title":"A new carrier recovery circuit for mobile satellite communications","authors":"Y. Matsumoto, M. Morikura, S. Kato","doi":"10.1109/VETEC.1992.245289","DOIUrl":"https://doi.org/10.1109/VETEC.1992.245289","url":null,"abstract":"A reverse modulation carrier recovery circuit for coherent detection of QPSK signals in Rician fading channels is proposed. The scheme consists of two reverse modulation type carrier recovery circuits, one of which has a wideband filter and the other a narrowband filter. The forward error correction (FEC) decoded data is used to reverse-modulate the received signals for the carrier recovery circuit, with a wideband filter, to achieve a low carrier skipping rate and a good phase tracking performance. It is clarified by computer simulation that the P/sub e/ (bit error probability) performance of QPSK coherent detection using the proposed carrier recovery circuit show an E/sub s//N/sub 0/ improvement of 4.0 Db without interleaving, and 1.2 dB with interleaving (size 64*64) at P/sub e/=10/sup -4/ (C/M=10 dB; f/sub D/T=1.67*10/sup -2/) compared with conventional coherent detection employing the reverse modulation tank-limiter scheme.<<ETX>>","PeriodicalId":114705,"journal":{"name":"[1992 Proceedings] Vehicular Technology Society 42nd VTS Conference - Frontiers of Technology","volume":"9 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":"123745170","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
Time variant models for satellite channel 卫星信道时变模型
[1992 Proceedings] Vehicular Technology Society 42nd VTS Conference - Frontiers of Technology Pub Date : 1992-05-10 DOI: 10.1109/VETEC.1992.245453
M. Jolfaei, D. Kreuer, O. Maly, U. Quernheim, W. Kremer
{"title":"Time variant models for satellite channel","authors":"M. Jolfaei, D. Kreuer, O. Maly, U. Quernheim, W. Kremer","doi":"10.1109/VETEC.1992.245453","DOIUrl":"https://doi.org/10.1109/VETEC.1992.245453","url":null,"abstract":"Different methods used to design mathematical models for a satellite channel are considered. These channel models, based on homogeneous Markov chains, are used as a basis for evaluation of OSI layer two protocols. The parameter design of the models is based on measured block error probabilities, obtained by German PTT on the Olympus 20/30-GHz channel. Since the block error rate is one of the most important issues for a satellite channel, the modeling will be based on block-oriented data transfers. The authors compare block error probabilities of Gilbert's (1960) and Fritchman's (1967) models with two generative time variant models. The first is a one-dimensional Markov chain (called time variant model, TV) and the second is a two-layered Markov model (called two layer time variant model, TLTV). Analyses and simulations show that the TLTV model exhibits the best results.<<ETX>>","PeriodicalId":114705,"journal":{"name":"[1992 Proceedings] Vehicular Technology Society 42nd VTS Conference - Frontiers of Technology","volume":"56 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":"125094409","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: 5
A simplified stochastic model for the aeronautical mobile radio channel 航空移动无线电信道的简化随机模型
[1992 Proceedings] Vehicular Technology Society 42nd VTS Conference - Frontiers of Technology Pub Date : 1992-05-10 DOI: 10.1109/VETEC.1992.245268
S. Elnoubi
{"title":"A simplified stochastic model for the aeronautical mobile radio channel","authors":"S. Elnoubi","doi":"10.1109/VETEC.1992.245268","DOIUrl":"https://doi.org/10.1109/VETEC.1992.245268","url":null,"abstract":"The aeronautical mobile radio channel is analyzed. A stochastic model for the channel is proposed in terms of the transmission coefficient. The power spectrum and the correlation functions are derived for cases of practical interest. The model is useful for predicting the error rate performance of digital modulation techniques. The results from a flight test showed the validity of the proposed model.<<ETX>>","PeriodicalId":114705,"journal":{"name":"[1992 Proceedings] Vehicular Technology Society 42nd VTS Conference - Frontiers of Technology","volume":"32 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":"121352090","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: 56
A comparison of CDMA and TDMA systems CDMA和TDMA系统的比较
[1992 Proceedings] Vehicular Technology Society 42nd VTS Conference - Frontiers of Technology Pub Date : 1992-05-10 DOI: 10.1109/VETEC.1992.245471
Bjbrn Gudmundmn, Skbld, K. Ugland
{"title":"A comparison of CDMA and TDMA systems","authors":"Bjbrn Gudmundmn, Skbld, K. Ugland","doi":"10.1109/VETEC.1992.245471","DOIUrl":"https://doi.org/10.1109/VETEC.1992.245471","url":null,"abstract":"Two candidates for high-capacity cellular systems are simulated and analyzed, one code-division multiple access (CDMA) and one time-division multiple access (TDMA) system. Simulations of the CDMA example indicate a high sensitivity to variations in certain system parameters. The TDMA example is a GSM system using random frequency hopping and operating without frequency planning. The simulations show that the TDMA system has at least the same capacity as the CDMA candidate. Soft capacity, efficient use of voice activity, and diversity are features available in both systems.<<ETX>>","PeriodicalId":114705,"journal":{"name":"[1992 Proceedings] Vehicular Technology Society 42nd VTS Conference - Frontiers of Technology","volume":"103 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":"121503923","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: 81
Evaluation of a cellular structure in indoor systems 室内系统中蜂窝结构的评价
[1992 Proceedings] Vehicular Technology Society 42nd VTS Conference - Frontiers of Technology Pub Date : 1992-05-10 DOI: 10.1109/VETEC.1992.245296
A. Kegel, F. van der Wijk, R. Prasad
{"title":"Evaluation of a cellular structure in indoor systems","authors":"A. Kegel, F. van der Wijk, R. Prasad","doi":"10.1109/VETEC.1992.245296","DOIUrl":"https://doi.org/10.1109/VETEC.1992.245296","url":null,"abstract":"A cellular structure is evaluated for a typical indoor wireless communication system by considering two aspects, namely the best possible location of the base station and the cell size. The cellular structure evaluation is studied based on outage probability for various situations. A mathematical model is developed for calculation of outage probability in an indoor environment due to only one interferer considering Rician distributed propagation loss and Rician fading for both desired and interfering signals.<<ETX>>","PeriodicalId":114705,"journal":{"name":"[1992 Proceedings] Vehicular Technology Society 42nd VTS Conference - Frontiers of Technology","volume":"44 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":"127576379","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: 5
Analysis of a fast CDMA power control scheme in an indoor environment 一种室内环境下快速CDMA功率控制方案的分析
[1992 Proceedings] Vehicular Technology Society 42nd VTS Conference - Frontiers of Technology Pub Date : 1992-05-10 DOI: 10.1109/VETEC.1992.245395
P. Díaz, R. Agustí
{"title":"Analysis of a fast CDMA power control scheme in an indoor environment","authors":"P. Díaz, R. Agustí","doi":"10.1109/VETEC.1992.245395","DOIUrl":"https://doi.org/10.1109/VETEC.1992.245395","url":null,"abstract":"The authors analyze the performance of a direct-sequence code-division multiple access (CDMA), in terms of bandwidth efficiency, when a fast power control is used. Coherent BPSK, reasonable for an indoor environment, is considered. Theoretical results for an ideal fast power control and simulation results assuming a realistic power control are presented for a multipath Rayleigh channel. Different kinds of coding, as block and convolutional schemes, are considered. Results obtained with an average power control technique are shown for comparison purposes.<<ETX>>","PeriodicalId":114705,"journal":{"name":"[1992 Proceedings] Vehicular Technology Society 42nd VTS Conference - Frontiers of Technology","volume":"25 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":"128084148","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: 7
Millimeter-wave channel measurements for indoor wireless communications 用于室内无线通信的毫米波信道测量
[1992 Proceedings] Vehicular Technology Society 42nd VTS Conference - Frontiers of Technology Pub Date : 1992-05-10 DOI: 10.1109/VETEC.1992.245322
G. Kalivas, M. El-Tanany, S. Mahmoud
{"title":"Millimeter-wave channel measurements for indoor wireless communications","authors":"G. Kalivas, M. El-Tanany, S. Mahmoud","doi":"10.1109/VETEC.1992.245322","DOIUrl":"https://doi.org/10.1109/VETEC.1992.245322","url":null,"abstract":"Propagation losses for the indoor radio channel at 21.6 GHz and 37.2 GHz are examined. The propagation measurements carried out are used to quantitatively present, through enveloped distribution, the effects of spatial fading, which is due to multipath propagation, and temporal fading, which is due to people moving in the building. Attenuation is given in the form of the exponent of the distance-power law.<<ETX>>","PeriodicalId":114705,"journal":{"name":"[1992 Proceedings] Vehicular Technology Society 42nd VTS Conference - Frontiers of Technology","volume":"121 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":"134329960","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: 23
Lee's model (cellular radio path loss prediction) 李氏模型(蜂窝无线电路径损耗预测)
[1992 Proceedings] Vehicular Technology Society 42nd VTS Conference - Frontiers of Technology Pub Date : 1992-05-10 DOI: 10.1109/VETEC.1992.245382
W.C.-Y. Lee
{"title":"Lee's model (cellular radio path loss prediction)","authors":"W.C.-Y. Lee","doi":"10.1109/VETEC.1992.245382","DOIUrl":"https://doi.org/10.1109/VETEC.1992.245382","url":null,"abstract":"Lee's model is used to predict the local-mean of a received signal along a mobile path where the mobile unit travels. The standard derivation of prediction error by comparing the predicted values with the measured data is approximately 2-3 dB. The model is simple to implement and has a theory to back it.<<ETX>>","PeriodicalId":114705,"journal":{"name":"[1992 Proceedings] Vehicular Technology Society 42nd VTS Conference - Frontiers of Technology","volume":"35 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":"134499541","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: 14
Block coded 16 QAM-TDMA cellular radio system using cyclical slow frequency hopping 块编码16 QAM-TDMA蜂窝无线电系统使用周期性慢跳频
[1992 Proceedings] Vehicular Technology Society 42nd VTS Conference - Frontiers of Technology Pub Date : 1992-05-10 DOI: 10.1109/VETEC.1992.245366
H. Sasaoka
{"title":"Block coded 16 QAM-TDMA cellular radio system using cyclical slow frequency hopping","authors":"H. Sasaoka","doi":"10.1109/VETEC.1992.245366","DOIUrl":"https://doi.org/10.1109/VETEC.1992.245366","url":null,"abstract":"A TDMA cellular system using cyclical slow frequency hopping and a block-coded quadrature amplitude modulation (QAM) is presented. The QAM scheme reduces the required bandwidth for voice channels. The combination of frequency hopping and coding offers immunity against multipath fading and interference. The sectorization and voice activity are used to reduce cochannel interference. These techniques increase the frequency reuse factor. The proposed system can achieve a capacity increase 13 times greater than that of analog systems.<<ETX>>","PeriodicalId":114705,"journal":{"name":"[1992 Proceedings] Vehicular Technology Society 42nd VTS Conference - Frontiers of Technology","volume":"2 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":"115365078","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: 14
Performance analysis of adaptive multi-hop routing protocols using a Markov model 基于马尔可夫模型的自适应多跳路由协议性能分析
[1992 Proceedings] Vehicular Technology Society 42nd VTS Conference - Frontiers of Technology Pub Date : 1992-05-10 DOI: 10.1109/VETEC.1992.245240
C. Rokitansky
{"title":"Performance analysis of adaptive multi-hop routing protocols using a Markov model","authors":"C. Rokitansky","doi":"10.1109/VETEC.1992.245240","DOIUrl":"https://doi.org/10.1109/VETEC.1992.245240","url":null,"abstract":"The results of a performance evaluation by analysis using Markov models of the adaptive multihop routing protocols DOR/FRAN and MARION for access from vehicles to an infrastructure network are presented. In the Markov model for the direction-oriented routing protocol (DOR/FRAN) implicit ACKs and retransmissions are taken into account. It is shown that the Markov model of the MARION protocol, which becomes more complex as the number of direct neighbors of a station increases, can be simplified if a large number of direct neighbors is assumed. The probability that a transmitted packet reaches the next beacon is calculated. The results of performance evaluation of the packet delay show that the MARION protocol is outperformed by the DOR/FRAN protocol, which could therefore be considered to be more suitable for PROMETHEUS applications with real-time requirements, and to be an appropriate adaptive multihop routing protocol candidate for the network layer of an integrated vehicle-vehicle and vehicle-beacon communication network.<<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":"115643513","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
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