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1997 IEEE 47th Vehicular Technology Conference. Technology in Motion最新文献

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Performance of signal strength handover algorithms with interference and correlated shadowings 干扰和相关阴影下信号强度切换算法的性能
1997 IEEE 47th Vehicular Technology Conference. Technology in Motion Pub Date : 1997-05-04 DOI: 10.1109/VETEC.1997.600383
M. Pratesi, M. Ruggieri, F. Graziosi, F. Santucci
{"title":"Performance of signal strength handover algorithms with interference and correlated shadowings","authors":"M. Pratesi, M. Ruggieri, F. Graziosi, F. Santucci","doi":"10.1109/VETEC.1997.600383","DOIUrl":"https://doi.org/10.1109/VETEC.1997.600383","url":null,"abstract":"This paper proposes results of an improved analysis of handover initiation algorithms in cellular mobile radio networks. Performance of relative signal strength handover algorithms is derived in a general environment with cross-correlated shadowings and interferers. Numerical results are presented for a bidimensional layout of hexagonal cells as well as for a lineal array of cells. It is seen that both cluster size and cross-correlation parameters may have a noticeable impact on algorithm performance. Hence they should be carefully considered in algorithm design.","PeriodicalId":389634,"journal":{"name":"1997 IEEE 47th Vehicular Technology Conference. Technology in Motion","volume":"58 Pt 11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-05-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126391477","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: 15
On understanding the nature of slow fading in LOS microcellular channels 对LOS微蜂窝信道缓慢衰落性质的认识
1997 IEEE 47th Vehicular Technology Conference. Technology in Motion Pub Date : 1997-05-04 DOI: 10.1109/VETEC.1997.600411
S. Aun Abbas, A. Sheikh
{"title":"On understanding the nature of slow fading in LOS microcellular channels","authors":"S. Aun Abbas, A. Sheikh","doi":"10.1109/VETEC.1997.600411","DOIUrl":"https://doi.org/10.1109/VETEC.1997.600411","url":null,"abstract":"Our investigations in understanding the physical mechanism of the LOS microcellular channel reveal that the principle source of slow fading is the random interference pattern of a few strong contributing paths which causes what we term as deceptive shadowing. It is shown that in a comparative curve fitting of slow fading, Nakagami distribution also fits the fading data. Also in non-zero mean complex Gaussian channels, the segregation of slow and fast fading using moving mean normalization is illusionary as the fading parameters in both cases remain the same. We argue that radio link performance calculation based on the segregation of slow and fast fading are therefore unnecessary for Rice/lognormal or Nakagami/lognormal fading models and may be avoided in order to simplify complex analyses.","PeriodicalId":389634,"journal":{"name":"1997 IEEE 47th Vehicular Technology Conference. Technology in Motion","volume":"168 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-05-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122305311","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
Analysis of a two-layer cellular mobile communication system 双层蜂窝移动通信系统的分析
1997 IEEE 47th Vehicular Technology Conference. Technology in Motion Pub Date : 1997-05-04 DOI: 10.1109/VETEC.1997.600470
C. Mihailescu, X. Lagrange, D. Zeghlache
{"title":"Analysis of a two-layer cellular mobile communication system","authors":"C. Mihailescu, X. Lagrange, D. Zeghlache","doi":"10.1109/VETEC.1997.600470","DOIUrl":"https://doi.org/10.1109/VETEC.1997.600470","url":null,"abstract":"Teletraffic aspects of hierarchical cellular systems with a focus on a reversible system are presented. An analytical model based on product forms is proposed. For the same QoS objective, carried traffic in the reversible system is superior to the non reversible scheme. The impact of the resource partition between layers is studied in a hierarchical network with independent layers. The mean number of handovers per call and the base station density are used to optimize the partition.","PeriodicalId":389634,"journal":{"name":"1997 IEEE 47th Vehicular Technology Conference. Technology in Motion","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-05-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114204987","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: 19
The effects of time delay spread on turbo-TCM in a wireless communication channel 无线通信信道中时延扩展对turbo-TCM的影响
1997 IEEE 47th Vehicular Technology Conference. Technology in Motion Pub Date : 1997-05-04 DOI: 10.1109/VETEC.1997.596375
Xiaofan Fei, Tsz-Mei Ko
{"title":"The effects of time delay spread on turbo-TCM in a wireless communication channel","authors":"Xiaofan Fei, Tsz-Mei Ko","doi":"10.1109/VETEC.1997.596375","DOIUrl":"https://doi.org/10.1109/VETEC.1997.596375","url":null,"abstract":"This paper presents some simulation results on the performances of turbo-codes with multilevel modulation (turbo-TCM) in a wireless environment. The wireless channel is modeled as a frequency selective fading channel with two time delay spread profiles, namely, a two-ray profile and a one-sided exponential profile. Turbo-TCM codes constructed from punctured turbo-codes combined with different modulation schemes are studied. It is found that turbo-TCM achieves unmatched performance of average irreducible BER. Turbo-TCM has much lower error probability than conventional TCM, especially in channels with high delay spread.","PeriodicalId":389634,"journal":{"name":"1997 IEEE 47th Vehicular Technology Conference. Technology in Motion","volume":"97 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-05-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121681407","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
Comparison of total system capacity for band sharing between CDMA based non-geostationary satellite-PCNs under imperfect power control conditions 不完全功率控制条件下基于CDMA的非地球静止卫星- pcn系统总容量的比较
1997 IEEE 47th Vehicular Technology Conference. Technology in Motion Pub Date : 1997-05-04 DOI: 10.1109/VETEC.1997.596354
H. M. Aziz, R. Tafazolli, B. Evans
{"title":"Comparison of total system capacity for band sharing between CDMA based non-geostationary satellite-PCNs under imperfect power control conditions","authors":"H. M. Aziz, R. Tafazolli, B. Evans","doi":"10.1109/VETEC.1997.596354","DOIUrl":"https://doi.org/10.1109/VETEC.1997.596354","url":null,"abstract":"The next generation of mobile satellite systems (MSS) will use the constellation of satellites in non-geostationary orbits for global communication, The proposed S-PCNs are Iridium, ICO, Globalstar, Odyssey and Ellipso. The first two systems propose to use a time division multiple access (TDMA) scheme and the others a code division multiple access (CDMA) scheme. It is claimed that CDMA based S-PCNs can share the allocated frequency bands due to the interference resistant property of CDMA. In this paper, we present the results of the investigation on the total system capacity achievable by totally overlapped band sharing between the two systems such as Globalstar and Odyssey under perfect and imperfect power control conditions. Results for a single satellite system operating in a band segmentation approach are also presented for comparison, again under perfect and imperfect power control.","PeriodicalId":389634,"journal":{"name":"1997 IEEE 47th Vehicular Technology Conference. Technology in Motion","volume":"2012 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-05-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125637630","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
A statistical model for angle of arrival in indoor multipath propagation 室内多径传播的到达角统计模型
1997 IEEE 47th Vehicular Technology Conference. Technology in Motion Pub Date : 1997-05-04 DOI: 10.1109/VETEC.1997.605467
Q. Spencer, M. Rice, B. Jeffs, M. Jensen
{"title":"A statistical model for angle of arrival in indoor multipath propagation","authors":"Q. Spencer, M. Rice, B. Jeffs, M. Jensen","doi":"10.1109/VETEC.1997.605467","DOIUrl":"https://doi.org/10.1109/VETEC.1997.605467","url":null,"abstract":"Multiple antenna systems are a useful way of overcoming the effects of multipath interference, and can allow more efficient use of spectrum. In order to test the effectiveness of various algorithms such as diversity combining, phased array processing, and adaptive array processing in an indoor environment, a channel model is needed which models both the time and angle of arrival in indoor environments. Some data has been collected indoors and some temporal models have been proposed, but no existing model accounts for both time and angle of arrival. This paper discusses existing models for the time of arrival, experimental data (form the 6.75-7.25 GHz band) that were collected indoors, and a proposed extension of the Saleh-Valenzuela model (1987), which accounts for the angle of arrival. Model parameters measured in two different buildings are compared with the parameters presented in the paper by Saleh and Valenzuela, and some statistical validation of the model is presented.","PeriodicalId":389634,"journal":{"name":"1997 IEEE 47th Vehicular Technology Conference. Technology in Motion","volume":"63 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-05-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131468459","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: 171
A constant gain radio transmitter for temperature and the different levels of input signal 一个恒定增益的无线电发射机，用于温度和不同电平的输入信号
1997 IEEE 47th Vehicular Technology Conference. Technology in Motion Pub Date : 1997-05-04 DOI: 10.1109/VETEC.1997.600417
K. Yoo
{"title":"A constant gain radio transmitter for temperature and the different levels of input signal","authors":"K. Yoo","doi":"10.1109/VETEC.1997.600417","DOIUrl":"https://doi.org/10.1109/VETEC.1997.600417","url":null,"abstract":"Since the system performance of a code division multiple access (CDMA) mobile communication system is very sensitive to the power control, a final output of the RF transmitter is very important. A common high power amplifier (HPA) has a temperature characteristic and its output level is not linearly amplified with the input level. A general power detector of a HPA using transistors has also a temperature characteristic. We suggest an intelligent control strategy to compensate the temperature characteristic and the effect of the input signal level to the HPA. An artificial neural network (ANN) is used to estimate the actual output power of the HPA based on power detection voltage for the given temperature and also to keep the open loop gain (HPA gain with a variable gain) constant. The stability problem, which is a hard issue when a system is non-linear, is also discussed.","PeriodicalId":389634,"journal":{"name":"1997 IEEE 47th Vehicular Technology Conference. Technology in Motion","volume":"98 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-05-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126972107","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
On the reservation multiple access protocols for future mobile communication systems 未来移动通信系统的保留多址协议
1997 IEEE 47th Vehicular Technology Conference. Technology in Motion Pub Date : 1997-05-04 DOI: 10.1109/VETEC.1997.605637
P. Taaghol, R. Tafazolli, B. Evans
{"title":"On the reservation multiple access protocols for future mobile communication systems","authors":"P. Taaghol, R. Tafazolli, B. Evans","doi":"10.1109/VETEC.1997.605637","DOIUrl":"https://doi.org/10.1109/VETEC.1997.605637","url":null,"abstract":"The need for high capacity and flexible air interface is driven by service requirements of the future third generation communication systems. Among the design parameters, not only does the choice multiple access technique greatly influence the spectrum efficiency, it also dictates the total system design. Despite the recent phenomenal growth in the number of proposed multiple access protocols for voice/data systems, general methods for comparison are lacking in the literature. A comprehensive performance comparison of an important class of multi-access protocols, known as reservation-based random access protocols, is presented. Two main performance evaluation techniques are used: (1) cross comparison and (2) internal comparison. In the former method, the performances of protocols are compared with each other under the same system specifications. In the latter method, protocols are compared against their respective dynamic upper bounds. This dynamic upper bound is mathematically analysed using the \"queueing theory\". Then, a comprehensive comparison of the existing reservation-based protocols is performed and discussed using the both collation methods. Finally, conclusions are drawn and future research directions are proposed.","PeriodicalId":389634,"journal":{"name":"1997 IEEE 47th Vehicular Technology Conference. Technology in Motion","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-05-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126978019","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
A block coding scheme for CDMA digital radio communication systems based on terminated convolutional codes 一种基于端接卷积码的CDMA数字无线电通信分块编码方案
1997 IEEE 47th Vehicular Technology Conference. Technology in Motion Pub Date : 1997-05-04 DOI: 10.1109/VETEC.1997.600530
J. K. Jush
{"title":"A block coding scheme for CDMA digital radio communication systems based on terminated convolutional codes","authors":"J. K. Jush","doi":"10.1109/VETEC.1997.600530","DOIUrl":"https://doi.org/10.1109/VETEC.1997.600530","url":null,"abstract":"We present an error-correction coding scheme for mobile digital code division multiple access (CDMA) communications. The code construction is based on the idea of generalized concatenated coding and assumes a non-coherent detection at the receiver. Such a condition is e.g. given in the reverse link of the IS-95 system. We use a first-order Reed-Muller (RM) inner code and terminated convolutional outer codes. For comparison purposes, the code employed in the reverse link of IS-95 is used as the reference code.","PeriodicalId":389634,"journal":{"name":"1997 IEEE 47th Vehicular Technology Conference. Technology in Motion","volume":"118 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-05-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128126688","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
Multi antenna C/I balancing in the downlink of digital cellular mobile radio systems 数字蜂窝移动无线电系统下行链路中的多天线C/I平衡
1997 IEEE 47th Vehicular Technology Conference. Technology in Motion Pub Date : 1997-05-04 DOI: 10.1109/VETEC.1997.600400
R. Schmalenberger, J. Blanz
{"title":"Multi antenna C/I balancing in the downlink of digital cellular mobile radio systems","authors":"R. Schmalenberger, J. Blanz","doi":"10.1109/VETEC.1997.600400","DOIUrl":"https://doi.org/10.1109/VETEC.1997.600400","url":null,"abstract":"This paper deals with a novel balancing method for the carrier to interference ratio C/I in the downlink of a digital cellular radio system, using an array antenna in conjunction with beam forming techniques at the base stations. This concept is an extension of the well-known centralized power control scheme for single antenna systems. Based on Monte Carlo simulations of a cellular environment, cumulative distribution functions of C/I are determined in order to evaluate the performance improvements enabled by the novel balancing method.","PeriodicalId":389634,"journal":{"name":"1997 IEEE 47th Vehicular Technology Conference. Technology in Motion","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-05-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133183590","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
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