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Proceedings of IEEE Vehicular Technology Conference (VTC)最新文献

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An analytic discrete-time model for a fading dispersive WSSUS channel 衰落色散WSSUS信道的离散时间解析模型
Proceedings of IEEE Vehicular Technology Conference (VTC) Pub Date : 1994-06-08 DOI: 10.1109/VETEC.1994.345142
K. Yip, T. Ng
{"title":"An analytic discrete-time model for a fading dispersive WSSUS channel","authors":"K. Yip, T. Ng","doi":"10.1109/VETEC.1994.345142","DOIUrl":"https://doi.org/10.1109/VETEC.1994.345142","url":null,"abstract":"This paper derives closed-form formulas for statistical characterization of the time-variant tap gains of an equivalent discrete-time channel model, which bears an equivalent input/output relationship with a continuous-time, fading dispersive, wide sense stationary uncorrelated scattering (WSSUS) radio channel.<<ETX>>","PeriodicalId":383541,"journal":{"name":"Proceedings of IEEE Vehicular Technology Conference (VTC)","volume":"657 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1994-06-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115112962","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: 6
Efficient methods for evaluation and prediction of subjective speech quality in GSM mobile networks GSM移动网络主观语音质量评价与预测的有效方法
Proceedings of IEEE Vehicular Technology Conference (VTC) Pub Date : 1994-06-08 DOI: 10.1109/VETEC.1994.345109
I. Gaspard
{"title":"Efficient methods for evaluation and prediction of subjective speech quality in GSM mobile networks","authors":"I. Gaspard","doi":"10.1109/VETEC.1994.345109","DOIUrl":"https://doi.org/10.1109/VETEC.1994.345109","url":null,"abstract":"Describes efficient methods, which are able to predict the expected speech quality by deriving a measurement from the GSM standard measurement RXQUAL (coded bit error rate) and transform this measurement into a subjective speech quality score. The evaluation of subjective speech quality-which is the basis for scoring by transformation on a subjective speech quality scale-is obtained by scientifically carried out speech investigations on a wide variety of possible speech samples in the German D1 network. The theoretically-determined transformations were confirmed by extensive measurements, which consider many parameters, like different fading profiles or length of the speech material. Furthermore this work gives hints to the visualisation of the predicted speech quality.<<ETX>>","PeriodicalId":383541,"journal":{"name":"Proceedings of IEEE Vehicular Technology Conference (VTC)","volume":"67 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1994-06-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115698690","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
Estimating the capacity of a frequency-selective fading mobile radio channel with antenna diversity 基于天线分集的频率选择衰落移动无线电信道容量估计
Proceedings of IEEE Vehicular Technology Conference (VTC) Pub Date : 1994-06-08 DOI: 10.1109/VETEC.1994.345343
M. D. Loundu, C. Despins, J. Conan
{"title":"Estimating the capacity of a frequency-selective fading mobile radio channel with antenna diversity","authors":"M. D. Loundu, C. Despins, J. Conan","doi":"10.1109/VETEC.1994.345343","DOIUrl":"https://doi.org/10.1109/VETEC.1994.345343","url":null,"abstract":"The primary objective of this paper is to estimate the capacity of a frequency-selective fading mobile radio channel used to communicate between N mobile units and a base station operating in space diversity and where M/spl ges/N. In general, the information theoretic value of the capacity of such a channel is not well defined because of the time-varying nature of the fading process. At best, the value of the capacity may be seen as a random variable evolving in time and whose distribution can be evaluated. The approach which has been followed in estimating the capacity uses a quasi-static model which computes the distribution over a large class of time dispersive possible realizations of the channel. Our final estimate of the numerical value of the capacity is based on the determination of an outage value corresponding to the 99% point on the cumulative distribution function. Our main result shows that a significant increase in the value of the capacity can be obtained by exploiting the inherent multipath diversity of the channel.<<ETX>>","PeriodicalId":383541,"journal":{"name":"Proceedings of IEEE Vehicular Technology Conference (VTC)","volume":"192 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1994-06-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124268874","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: 8
Wide band characterization of the mobile-satellite propagation channel using a helicopter 使用直升机的移动卫星传播信道的宽带特性
Proceedings of IEEE Vehicular Technology Conference (VTC) Pub Date : 1994-06-08 DOI: 10.1109/VETEC.1994.345226
P. L. Menn, V. Ciarletti, A. Levy, M. Sylvain
{"title":"Wide band characterization of the mobile-satellite propagation channel using a helicopter","authors":"P. L. Menn, V. Ciarletti, A. Levy, M. Sylvain","doi":"10.1109/VETEC.1994.345226","DOIUrl":"https://doi.org/10.1109/VETEC.1994.345226","url":null,"abstract":"The paper first presents an experimental set-up using a helicopter, which was realized to study the wide band and variable mobile satellite propagation channel. The first statistical characterizations stated are described. More specifically, the authors present cumulative distributions of narrow band and wide band excess path loss as a function of the elevation angle, as well as distribution functions of some frequency selectivity parameters.<<ETX>>","PeriodicalId":383541,"journal":{"name":"Proceedings of IEEE Vehicular Technology Conference (VTC)","volume":"116 10","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1994-06-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120818995","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 fully convergent joint blind equalization/phase recovery scheme for data communication systems 数据通信系统的全收敛联合盲均衡/相位恢复方案
Proceedings of IEEE Vehicular Technology Conference (VTC) Pub Date : 1994-06-08 DOI: 10.1109/VETEC.1994.345124
J. M. Páez-Borrallo, S. Zazo, I. Pérez-Álvarez
{"title":"A fully convergent joint blind equalization/phase recovery scheme for data communication systems","authors":"J. M. Páez-Borrallo, S. Zazo, I. Pérez-Álvarez","doi":"10.1109/VETEC.1994.345124","DOIUrl":"https://doi.org/10.1109/VETEC.1994.345124","url":null,"abstract":"Presents a new adaptive algorithm for joint blind equalization and phase recovery in data communication systems. This algorithm is mainly based on the standard decision directed algorithm (DDA) but the incorporation of both a linear constraint in the filter coefficients and an adjustable complex parameter in the decision device, provide an unimodal error surface. This attractive performance is analyzed theoretically when faced with minimum phase channels. For the more realistic situation of non minimum phase channels exhaustive simulations show that a similar behavior can be expected.<<ETX>>","PeriodicalId":383541,"journal":{"name":"Proceedings of IEEE Vehicular Technology Conference (VTC)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1994-06-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127304734","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
Adaptive equalization for DECT systems operating in low time-dispersive channels 低时间色散信道下DECT系统的自适应均衡
Proceedings of IEEE Vehicular Technology Conference (VTC) Pub Date : 1994-06-08 DOI: 10.1109/VETEC.1994.345034
J. Fuhl, G. Schultes, W. Kozek
{"title":"Adaptive equalization for DECT systems operating in low time-dispersive channels","authors":"J. Fuhl, G. Schultes, W. Kozek","doi":"10.1109/VETEC.1994.345034","DOIUrl":"https://doi.org/10.1109/VETEC.1994.345034","url":null,"abstract":"DECT (Digital European Cordless Telecommunication) is the current standard for digital cordless indoor communication in Europe. We investigate the use of channel equalization to increase the coverage area of DECT in large delays spread environments. We show that it is possible to use all equalizer and still stay within the DECT-common air interface. The equalizer structure is a decision feedback equalizer (DFE). The packet synchronizing word, which is used for slot synchronization, is used as trailing sequence for tap gain adjustment. For adaptation a recursive least squares (RLS) algorithm is used. The results show that the tolerable delay spread for receivers with an adaptive equalizer can be significantly increased depending on the length of the equalizer.<<ETX>>","PeriodicalId":383541,"journal":{"name":"Proceedings of IEEE Vehicular Technology Conference (VTC)","volume":"67 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1994-06-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125886194","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
Distributed power balancing with a sparse information link 基于稀疏信息链路的分布式功率均衡
Proceedings of IEEE Vehicular Technology Conference (VTC) Pub Date : 1994-06-08 DOI: 10.1109/VETEC.1994.345206
W. Wong, Kam Hung Lam
{"title":"Distributed power balancing with a sparse information link","authors":"W. Wong, Kam Hung Lam","doi":"10.1109/VETEC.1994.345206","DOIUrl":"https://doi.org/10.1109/VETEC.1994.345206","url":null,"abstract":"A new distributed power control algorithm is introduced. The algorithm is based on the assumption that some limited control data communication between interfering transceivers is allowed. A summary of the convergence property and simulation studies of the algorithm is presented.<<ETX>>","PeriodicalId":383541,"journal":{"name":"Proceedings of IEEE Vehicular Technology Conference (VTC)","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1994-06-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126111889","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
12 GHz band wave propagation measurements in rooms for a wireless local area network 12 GHz波段的波传播测量在一个无线局域网的房间
Proceedings of IEEE Vehicular Technology Conference (VTC) Pub Date : 1994-06-08 DOI: 10.1109/VETEC.1994.345221
Y. P. Zhang, Y. Hwang
{"title":"12 GHz band wave propagation measurements in rooms for a wireless local area network","authors":"Y. P. Zhang, Y. Hwang","doi":"10.1109/VETEC.1994.345221","DOIUrl":"https://doi.org/10.1109/VETEC.1994.345221","url":null,"abstract":"12 GHz band wave propagation measurements in rooms of different uses have been performed. Analysis to the measured data reveals that the in-room signal attenuation followed the simple d to power n law where n ranges from 1.5 to 2.3, and the in-room signal distribution adheres to the Rician distribution.<<ETX>>","PeriodicalId":383541,"journal":{"name":"Proceedings of IEEE Vehicular Technology Conference (VTC)","volume":"52 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1994-06-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122555596","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
An adaptive equalizer for digital FM with limiter-discriminator detection in frequency-selective fading channel 频率选择衰落信道中带有限制鉴别器检测的数字调频自适应均衡器
Proceedings of IEEE Vehicular Technology Conference (VTC) Pub Date : 1994-06-08 DOI: 10.1109/VETEC.1994.345127
Y. Akaiwa, M. Maki
{"title":"An adaptive equalizer for digital FM with limiter-discriminator detection in frequency-selective fading channel","authors":"Y. Akaiwa, M. Maki","doi":"10.1109/VETEC.1994.345127","DOIUrl":"https://doi.org/10.1109/VETEC.1994.345127","url":null,"abstract":"An adaptive equalizer is proposed for a nonlinear transmission system, i.e., frequency modulation with limiter-discriminator detection. In this method, a linear feedback equalizer at IF band is controlled by evaluating the target function which is defined as mean square error at decision sampling instants. The principle of this method is based on the fact that frequency demodulated signals take given discrete values at the sampling instants if the equalization succeeds. As the adaptive algorithm, the authors adopt the Powell method, that is a general method of search for the minimum value. They propose to repeat the Powell method in order to reach the minimum value avoiding local minimum points. A computer simulation experiment is carried out assuming a two-level FM system with limiter-discriminator detection under two- and three-ray models including minimum- and non-minimum phase shift conditions. The convergence of the equalizer to the minimum value is confirmed. Together with equalization characteristics error rate performance is shown.<<ETX>>","PeriodicalId":383541,"journal":{"name":"Proceedings of IEEE Vehicular Technology Conference (VTC)","volume":"32 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1994-06-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122869660","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
Sequence estimation for frequency non-selective channels using a hidden Markov model 基于隐马尔可夫模型的频率非选择性信道序列估计
Proceedings of IEEE Vehicular Technology Conference (VTC) Pub Date : 1994-06-08 DOI: 10.1109/VETEC.1994.345293
H. Kong, E. Shwedyk
{"title":"Sequence estimation for frequency non-selective channels using a hidden Markov model","authors":"H. Kong, E. Shwedyk","doi":"10.1109/VETEC.1994.345293","DOIUrl":"https://doi.org/10.1109/VETEC.1994.345293","url":null,"abstract":"Fading in a multipath channel is modelled as a Markov process. Based on this, maximum a posteriori (MAP) estimation is developed for fading channels with intersymbol interference (ISI).<<ETX>>","PeriodicalId":383541,"journal":{"name":"Proceedings of IEEE Vehicular Technology Conference (VTC)","volume":"54 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1994-06-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114144833","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
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