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VTC '98. 48th IEEE Vehicular Technology Conference. Pathway to Global Wireless Revolution (Cat. No.98CH36151)最新文献

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Predictive power estimators in CDMA closed loop power control CDMA闭环功率控制中的预测功率估计
VTC '98. 48th IEEE Vehicular Technology Conference. Pathway to Global Wireless Revolution (Cat. No.98CH36151) Pub Date : 1998-05-18 DOI: 10.1109/VETEC.1998.686408
J. Tanskanen, A. Huang, I. Hartimo
{"title":"Predictive power estimators in CDMA closed loop power control","authors":"J. Tanskanen, A. Huang, I. Hartimo","doi":"10.1109/VETEC.1998.686408","DOIUrl":"https://doi.org/10.1109/VETEC.1998.686408","url":null,"abstract":"The estimation of signal power is considered. Methods of designing optimized and partially-optimized power estimators, based on the Wiener model, for complex-valued signals are presented. Our application is a predictive received power level estimation in closed loop transmitter power control of mobile CDMA communications systems. The proposed estimators have the benefits of guaranteed positive output, high computational efficiency as compared to quadratic filters, and providing for a predescribed prediction step, all the aspects being of great interest when applying the estimators in delay sensitive closed control loops. The user capacity of a CDMA communications system is generally found to be greatly interference limited, and thus proper power control system functioning is of paramount interest. The partially-optimized power estimators are simulated along with Heinonen-Neuvo (1988) polynomial predictors in singleand multiuser CDMA uplink closed power control loop simulators.","PeriodicalId":335954,"journal":{"name":"VTC '98. 48th IEEE Vehicular Technology Conference. Pathway to Global Wireless Revolution (Cat. No.98CH36151)","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-05-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133027364","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: 17
Measured variation in performance of handheld antennas for a large number of test persons 大量测试人员对手持天线性能变化的测量
VTC '98. 48th IEEE Vehicular Technology Conference. Pathway to Global Wireless Revolution (Cat. No.98CH36151) Pub Date : 1998-05-18 DOI: 10.1109/VETEC.1998.686625
G. F. Pedersen, J. Nielsen, K. Olesen, Istvan Z. Kovacs
{"title":"Measured variation in performance of handheld antennas for a large number of test persons","authors":"G. F. Pedersen, J. Nielsen, K. Olesen, Istvan Z. Kovacs","doi":"10.1109/VETEC.1998.686625","DOIUrl":"https://doi.org/10.1109/VETEC.1998.686625","url":null,"abstract":"This work investigates the variation in the mean effective gain (MEG) for a large number of test persons in order to find how much the difference in anatomy and persons who wear glasses, etc., changes the MEG (i.e., the received signal power with respect to a reference). The evaluation was carried out in a typical GSM-1800 urban micro cell with the base station located outdoor approximately 700 m from the mobile. The mobile was located in office like environments. Peak variations in the MEG among different persons of more than 10 dB were found and the difference between \"no person present\" and a person present is on the average 3 dB for a directive patch antenna, 6 dB for a whip antenna and 10 dB for a helical antenna.","PeriodicalId":335954,"journal":{"name":"VTC '98. 48th IEEE Vehicular Technology Conference. Pathway to Global Wireless Revolution (Cat. No.98CH36151)","volume":"36 3","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-05-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133107177","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: 76
Performance of FRAMES non-spread mode 1 (WB-TDMA) with turbo codes turbo码下FRAMES非扩频模式1 (WB-TDMA)的性能
VTC '98. 48th IEEE Vehicular Technology Conference. Pathway to Global Wireless Revolution (Cat. No.98CH36151) Pub Date : 1998-05-18 DOI: 10.1109/VETEC.1998.683700
H. Holma, J. Plechinger, M. Doetsch, F. Berens, P. Jung
{"title":"Performance of FRAMES non-spread mode 1 (WB-TDMA) with turbo codes","authors":"H. Holma, J. Plechinger, M. Doetsch, F. Berens, P. Jung","doi":"10.1109/VETEC.1998.683700","DOIUrl":"https://doi.org/10.1109/VETEC.1998.683700","url":null,"abstract":"Within ACTS the project FRAMES (Future Radio Wideband Multiple Access System) has been set up with an objective to define a proposal for a UMTS radio access system. Based on an initial evaluation phase in FRAMES, a harmonized multiple access platform has been designed consisting of two modes: FMA1, a wideband TDMA and FMA2, a wideband CDMA. In this paper, link level results obtained for FMA1 without spreading are presented. In particular, the application of the novel rate compatible punctured turbo-codes (RCPTC), are compared with conventional nonsystematic convolutional coding. The emphasis lies on the packet transmission and on the circuit switched high bit rates. These simulation results can be applied to frequency division duplex (FDD) and to time division duplex (TDD) operation.","PeriodicalId":335954,"journal":{"name":"VTC '98. 48th IEEE Vehicular Technology Conference. Pathway to Global Wireless Revolution (Cat. No.98CH36151)","volume":"105 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-05-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134073004","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
Array beamforming based on cyclic signal detection 基于循环信号检测的阵列波束形成
VTC '98. 48th IEEE Vehicular Technology Conference. Pathway to Global Wireless Revolution (Cat. No.98CH36151) Pub Date : 1998-05-18 DOI: 10.1109/VETEC.1998.683710
J. Xin, H. Tsuji, Y. Hase, A. Sano
{"title":"Array beamforming based on cyclic signal detection","authors":"J. Xin, H. Tsuji, Y. Hase, A. Sano","doi":"10.1109/VETEC.1998.683710","DOIUrl":"https://doi.org/10.1109/VETEC.1998.683710","url":null,"abstract":"In mobile communication systems, in order to extract the desired signal while suppressing the interference and noise, array beamforming techniques are usually employed. However in most beamforming methods, a priori knowledge of the directions of arrival (DOA) or waveform of the signals of interest (SOI) is often required. In this paper, the cyclostationary property of most communication signals is exploited to develop a new method of beamforming. The DOA is estimated by a signal selective direction finding scheme, and then the optimum weights are determined according to multiple linear constraints. The effectiveness of the proposed approach is demonstrated through numerical examples.","PeriodicalId":335954,"journal":{"name":"VTC '98. 48th IEEE Vehicular Technology Conference. Pathway to Global Wireless Revolution (Cat. No.98CH36151)","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-05-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130328184","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
Code acquisition in a class of time-varying channels 一类时变信道的代码采集
VTC '98. 48th IEEE Vehicular Technology Conference. Pathway to Global Wireless Revolution (Cat. No.98CH36151) Pub Date : 1998-05-18 DOI: 10.1109/VETEC.1998.686195
Y. Su, Ru-Chwen Wu
{"title":"Code acquisition in a class of time-varying channels","authors":"Y. Su, Ru-Chwen Wu","doi":"10.1109/VETEC.1998.686195","DOIUrl":"https://doi.org/10.1109/VETEC.1998.686195","url":null,"abstract":"This paper presents a model for the code acquisition in a time-varying channel and evaluates the associated acquisition time statistics. We first, use a finite-state Markov chain to represent the time-varying channel. Each channel state can have either a frequency-selective or a frequency-nonselective fading characteristic. This model is an unconstrained model as it does not take into account two time-parameters. The first time-parameter is the \"time unit\" for the Markov channel, which has to be determined by the channel Doppler spread or its fading rate. The second time-parameter has to do with the detection structure. Incorporating the constraints imposed by these two time-parameters we discuss modifications of the unconstrained model, derive related statistics (e.g., probability distribution function or characteristic function) of the acquisition time and then provide numerical examples of the acquisition time performance.","PeriodicalId":335954,"journal":{"name":"VTC '98. 48th IEEE Vehicular Technology Conference. Pathway to Global Wireless Revolution (Cat. No.98CH36151)","volume":"73 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-05-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114391793","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
Handover in a broadband cellular ATM access system 宽带蜂窝ATM接入系统中的切换
VTC '98. 48th IEEE Vehicular Technology Conference. Pathway to Global Wireless Revolution (Cat. No.98CH36151) Pub Date : 1998-05-18 DOI: 10.1109/VETEC.1998.686413
M. Litzenburger, H. Bakker, W. Schodl
{"title":"Handover in a broadband cellular ATM access system","authors":"M. Litzenburger, H. Bakker, W. Schodl","doi":"10.1109/VETEC.1998.686413","DOIUrl":"https://doi.org/10.1109/VETEC.1998.686413","url":null,"abstract":"Handover is one of the key aspects of future broadband pico-cellular wireless ATM-systems allowing terminal mobility. In this paper, we investigate the specific handover problems arising in such a system. Some examples of handover procedures are investigated in detail by means of message sequence charts. Special attention is given to the requirements which the execution of a handover puts to connection admission control functions. Furthermore, the routing of signalling messages is discussed.","PeriodicalId":335954,"journal":{"name":"VTC '98. 48th IEEE Vehicular Technology Conference. Pathway to Global Wireless Revolution (Cat. No.98CH36151)","volume":"68 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-05-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114546206","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
Synchronization for single carrier modulation with frequency domain equalization 采用频域均衡的单载波调制同步
VTC '98. 48th IEEE Vehicular Technology Conference. Pathway to Global Wireless Revolution (Cat. No.98CH36151) Pub Date : 1998-05-18 DOI: 10.1109/VETEC.1998.686163
A. Czylwik
{"title":"Synchronization for single carrier modulation with frequency domain equalization","authors":"A. Czylwik","doi":"10.1109/VETEC.1998.686163","DOIUrl":"https://doi.org/10.1109/VETEC.1998.686163","url":null,"abstract":"This paper deals with the synchronization of single carrier transmission with frequency domain equalization (FDE) for broadband mobile radio applications. For such applications carrier frequency and temporal position of the FFT (fast Fourier transform) window have to be synchronized. Furthermore, an estimation of the channel transfer function is necessary.","PeriodicalId":335954,"journal":{"name":"VTC '98. 48th IEEE Vehicular Technology Conference. Pathway to Global Wireless Revolution (Cat. No.98CH36151)","volume":"46 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-05-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114685812","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: 22
Gaussian maximum likelihood blind multichannel multiuser identification 高斯最大似然盲多通道多用户识别
VTC '98. 48th IEEE Vehicular Technology Conference. Pathway to Global Wireless Revolution (Cat. No.98CH36151) Pub Date : 1998-05-18 DOI: 10.1109/VETEC.1998.686515
L. Deneire, D. Slock
{"title":"Gaussian maximum likelihood blind multichannel multiuser identification","authors":"L. Deneire, D. Slock","doi":"10.1109/VETEC.1998.686515","DOIUrl":"https://doi.org/10.1109/VETEC.1998.686515","url":null,"abstract":"We consider a spatial division multiple access (SDMA) situation in which p users operate on the same carrier frequency and use the same linear digital modulation format. We consider m>p antennas receiving mixtures of these signals through multi-path propagation (equivalently, oversampling of the received signals of a smaller number of antenna signals could be used). Current approaches to multiuser blind channel identification include subspace-fitting techniques, deterministic maximum-likelihood (DML) techniques and linear prediction methods. The two first techniques are rather closely related and give the channel apart from a triangular dynamical multiplicative factor, moreover, they are not robust to channel length overestimation. The latter approach is robust to channel length overestimation and yields the channel estimate apart from a unitary static multiplicative factor, which can be determined by resorting to higher order statistics. On the other hand, Gaussian maximum likelihood (GML) methods have been introduced in de Carvalho and Slock (1997) for the single user case and have given better performances than DML. Extending GML to the multiuser case, we can expect good performances, and, as is shown in the identifiability section, we get the channel apart from a unitary static multiplicative factor.","PeriodicalId":335954,"journal":{"name":"VTC '98. 48th IEEE Vehicular Technology Conference. Pathway to Global Wireless Revolution (Cat. No.98CH36151)","volume":"59 42","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-05-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114089526","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
Constant modulus algorithm (CMA) for CDMA communications systems 常模算法(CMA)用于CDMA通信系统
VTC '98. 48th IEEE Vehicular Technology Conference. Pathway to Global Wireless Revolution (Cat. No.98CH36151) Pub Date : 1998-05-18 DOI: 10.1109/VETEC.1998.686380
P. He, T. Tjhung, L. Rasmussen
{"title":"Constant modulus algorithm (CMA) for CDMA communications systems","authors":"P. He, T. Tjhung, L. Rasmussen","doi":"10.1109/VETEC.1998.686380","DOIUrl":"https://doi.org/10.1109/VETEC.1998.686380","url":null,"abstract":"Blind adaptive multiuser detection based on the constant modulus algorithm (CMA) has received a lot of attention. In the blind detectors proposed previously, the CMA is applied to the output of the chip match filters. In this paper, we consider the use of the CMA at the output of a bank of filters matched to the signature waveforms of each user. For simplicity, a synchronous code division multiple access (CDMA) system is adopted. The convergence performance of the blind detector is also analyzed and the results indicate that the CMA does not have the stable undesired equilibrium, which has been proven to exist for the practical Goddard algorithm with the finite tap equalizer when used in intersymbol interference (ISI) channels. However, the permutation ambiguity and the phase ambiguity occur. To avoid the permutation and phase ambiguities, some constraints are introduced into the CMA and their validity is also proven by analysis and simulations. When the CMA for each user converges to the desired solution, the blind detector is approaching to the decorrelating detector.","PeriodicalId":335954,"journal":{"name":"VTC '98. 48th IEEE Vehicular Technology Conference. Pathway to Global Wireless Revolution (Cat. No.98CH36151)","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-05-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114538779","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: 12
Spread spectrum joint communication and ranging system using interference cancellation between a roadside and a vehicle 扩频联合通信和测距系统，利用路边和车辆之间的干扰消除
VTC '98. 48th IEEE Vehicular Technology Conference. Pathway to Global Wireless Revolution (Cat. No.98CH36151) Pub Date : 1998-05-18 DOI: 10.1109/VETEC.1998.686093
M. Takeda, T. Terada, R. Kohno
{"title":"Spread spectrum joint communication and ranging system using interference cancellation between a roadside and a vehicle","authors":"M. Takeda, T. Terada, R. Kohno","doi":"10.1109/VETEC.1998.686093","DOIUrl":"https://doi.org/10.1109/VETEC.1998.686093","url":null,"abstract":"This paper proposes and investigates a spread spectrum (SS) system which can realize both ranging and communication between a vehicle and a roadside. In order to improve the performance of ranging and communication, we propose schemes for cancelling the mutual interference between a SS ranging signal and SS communication one. Computer simulations illustrate improved performance of both ranging accuracy and data bit error rate.","PeriodicalId":335954,"journal":{"name":"VTC '98. 48th IEEE Vehicular Technology Conference. Pathway to Global Wireless Revolution (Cat. No.98CH36151)","volume":"68 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-05-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116753549","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: 12
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