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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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An investigation of millimeter wave propagation mechanisms for mobile intervehicle communications and outdoor MBS 毫米波在移动车际通信和户外MBS中的传播机制研究
VTC '98. 48th IEEE Vehicular Technology Conference. Pathway to Global Wireless Revolution (Cat. No.98CH36151) Pub Date : 1998-05-18 DOI: 10.1109/VETEC.1998.686066
D. Didascalou, F. Kuchen, W. Wiesbeck
{"title":"An investigation of millimeter wave propagation mechanisms for mobile intervehicle communications and outdoor MBS","authors":"D. Didascalou, F. Kuchen, W. Wiesbeck","doi":"10.1109/VETEC.1998.686066","DOIUrl":"https://doi.org/10.1109/VETEC.1998.686066","url":null,"abstract":"Future intelligent transportation systems (ITS) and mobile broadband systems (MBS) will deeply rely on millimeter waves for communication purposes. Therefore their properties have to be known. In this paper, the propagation mechanisms of reflection and diffraction at curved surfaces at millimeter wave frequencies are investigated. They are classified with respect to the requirements of mobile intervehicle communications. The consideration of realistic street geometries and parameters leads to novel insights, which were formerly neglected.","PeriodicalId":335954,"journal":{"name":"VTC '98. 48th IEEE Vehicular Technology Conference. Pathway to Global Wireless Revolution (Cat. No.98CH36151)","volume":"35 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":"115244214","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
Combined multiuser reception and channel decoding for TDMA cellular systems TDMA蜂窝系统的组合多用户接收和信道解码
VTC '98. 48th IEEE Vehicular Technology Conference. Pathway to Global Wireless Revolution (Cat. No.98CH36151) Pub Date : 1998-05-18 DOI: 10.1109/VETEC.1998.686089
M. C. Valenti, B. Woerner
{"title":"Combined multiuser reception and channel decoding for TDMA cellular systems","authors":"M. C. Valenti, B. Woerner","doi":"10.1109/VETEC.1998.686089","DOIUrl":"https://doi.org/10.1109/VETEC.1998.686089","url":null,"abstract":"This paper presents a method of combating the detrimental effects of multiple-access interference present in coded time division multiple access (TDMA) systems. The optimal asynchronous multiuser detector is adapted for use by TDMA systems, which are characterized by a single desired user and a small number of strong interferers operating in adjacent cells with identical spreading codes. The proposed receiver features a soft-input/soft-output (SISO) multiuser detector and a SISO channel decoder operating in an iterative feedback, or \"turbo\" configuration. Simulation results are shown for the case when two users, the desired user and one strong interferer, are jointly detected and each user employs a weak recursive systematic convolutional code.","PeriodicalId":335954,"journal":{"name":"VTC '98. 48th IEEE Vehicular Technology Conference. Pathway to Global Wireless Revolution (Cat. No.98CH36151)","volume":"24 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":"116112861","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
A variable partition duplex scheme on packet reservation multiple access protocol (VPD-PRMA) 分组保留多址协议(VPD-PRMA)上的可变分区双工方案
VTC '98. 48th IEEE Vehicular Technology Conference. Pathway to Global Wireless Revolution (Cat. No.98CH36151) Pub Date : 1998-05-18 DOI: 10.1109/VETEC.1998.686543
Cooper Chang, Chung-Ju Chang
{"title":"A variable partition duplex scheme on packet reservation multiple access protocol (VPD-PRMA)","authors":"Cooper Chang, Chung-Ju Chang","doi":"10.1109/VETEC.1998.686543","DOIUrl":"https://doi.org/10.1109/VETEC.1998.686543","url":null,"abstract":"A variable partition duplex scheme on packet reservation multiple access protocol (VPD-PRMA) is proposed in this paper. The variable partition duplex scheme allows both uplink and downlink traffic to share a common communication resource and takes advantage of the nature of a conversation pair that only one party is talking in most of the conversation intervals. By adopting VPD-PRMA, wireless communication systems can get higher statistical multiplexing gain due to the trunking effect. We study the performance of the VPD-PRMA system by computer simulation. The results show that the system capacity of the VPD-PRMA system is 23 and that of the traditional PRMA system is 19. By adopting VPD-PRMA on the DECT frame structure, the total capacity of the VPD-PRMA system is 230 voice channels, which is almost twice the capacity (120 channels) of the typical DECT system.","PeriodicalId":335954,"journal":{"name":"VTC '98. 48th IEEE Vehicular Technology Conference. Pathway to Global Wireless Revolution (Cat. No.98CH36151)","volume":"96 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":"122651182","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
Impact of radio interfaces on mobile multimedia services 无线接口对移动多媒体业务的影响
VTC '98. 48th IEEE Vehicular Technology Conference. Pathway to Global Wireless Revolution (Cat. No.98CH36151) Pub Date : 1998-05-18 DOI: 10.1109/VETEC.1998.683712
B. G. Marchent, M. Wilson, A. Rouz
{"title":"Impact of radio interfaces on mobile multimedia services","authors":"B. G. Marchent, M. Wilson, A. Rouz","doi":"10.1109/VETEC.1998.683712","DOIUrl":"https://doi.org/10.1109/VETEC.1998.683712","url":null,"abstract":"The development of 3/sup rd/ generation mobile systems, such as UMTS and IMT-2000, should provide a range of flexible transport characteristics to support mobile multimedia applications. This will enable many broadband multimedia services developed for ATM and IP to be offered to mobile users. However transport over the radio interface can result in high error rates and delays. Also there is a requirement to maintain user connections and QoS during handover. The characteristics of transport within ATM and IP networks are compared to transport over wideband TDMA and CDMA radio interfaces. Scenarios are developed for the support of interworking, handover and macro diversity.","PeriodicalId":335954,"journal":{"name":"VTC '98. 48th IEEE Vehicular Technology Conference. Pathway to Global Wireless Revolution (Cat. No.98CH36151)","volume":"83 3-4","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-05-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114046032","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
Reconfigurable adaptive RAKE receiver for wideband CDMA systems 用于宽带CDMA系统的可重构自适应RAKE接收机
VTC '98. 48th IEEE Vehicular Technology Conference. Pathway to Global Wireless Revolution (Cat. No.98CH36151) Pub Date : 1998-05-18 DOI: 10.1109/VETEC.1998.686054
M. Latva-aho, M. Juntti, I. Oppermann
{"title":"Reconfigurable adaptive RAKE receiver for wideband CDMA systems","authors":"M. Latva-aho, M. Juntti, I. Oppermann","doi":"10.1109/VETEC.1998.686054","DOIUrl":"https://doi.org/10.1109/VETEC.1998.686054","url":null,"abstract":"Conventional RAKE receiver is near-far limited in code-division multiple-access (CDMA) systems. Linear minimum mean squared error (LMMSE) criterion can be used to obtain near-far resistant single-user receivers. Depending on the optimization criterion different adaptive receivers are obtained. A novel adaptive LMMSE-RAKE receiver based on two different LMMSE criteria is presented. The receiver combines the conventional RAKE receiver and single-user LMMSE receivers. Depending on a quality indicator the receiver switches itself to different modes depending on the radio channel conditions. According to the simulation results the novel receiver concept remarkably improves the performance of the conventional RAKE receivers under various channel conditions and data rates.","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":"114390799","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
Connection admission control for indoor multimedia wireless communications 室内多媒体无线通信的接入控制
VTC '98. 48th IEEE Vehicular Technology Conference. Pathway to Global Wireless Revolution (Cat. No.98CH36151) Pub Date : 1998-05-18 DOI: 10.1109/VETEC.1998.686224
J. Chak, W. Zhuang
{"title":"Connection admission control for indoor multimedia wireless communications","authors":"J. Chak, W. Zhuang","doi":"10.1109/VETEC.1998.686224","DOIUrl":"https://doi.org/10.1109/VETEC.1998.686224","url":null,"abstract":"This paper proposes a connection admission control (CAC) algorithm for the reverse-link transmission of a packetized indoor multimedia wireless communication network using a direct sequence code division multiple access (DS-CDMA) protocol. The traffic types include voice, data, facsimile and low-rate video. The CAC algorithm maximizes the utilization of the system resources (i.e., the reverse-link frequency spectrum and the output buffers at the base stations) and, at the same time, guarantees quality of service (QoS) to each of the network users. It checks if there are enough resources for a new connection request by comparing the measured signal-to-interference-plus-noise ratio (SINR) to a calculated SINR threshold. If the measured SINR is higher than the corresponding SINR threshold for all mobile terminals (including the requesting mobile) in the microcell, then the requesting mobile terminal can be admitted into the system. The performance of the algorithm is verified by using the Markov modulated Poisson process (MMPP) to model the traffic sources.","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":"129597490","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
Wideband measurement and simulation of the DECT indoor propagation channel DECT室内传播信道的宽带测量与仿真
VTC '98. 48th IEEE Vehicular Technology Conference. Pathway to Global Wireless Revolution (Cat. No.98CH36151) Pub Date : 1998-05-18 DOI: 10.1109/VETEC.1998.686463
G. Lombardi, V. Degli‐Esposti, C. Passerini
{"title":"Wideband measurement and simulation of the DECT indoor propagation channel","authors":"G. Lombardi, V. Degli‐Esposti, C. Passerini","doi":"10.1109/VETEC.1998.686463","DOIUrl":"https://doi.org/10.1109/VETEC.1998.686463","url":null,"abstract":"Several standards for indoor voice and data wireless applications are emerging, and among them DECT is certainly one of the most important. In order to investigate DECT data radio transmission performance in the hostile indoor environment, reliable propagation analysis tools are required. The results of an accurate measurement campaign are compared with the prediction provided by a 3D ray-tracing field prediction model in the paper. The comparisons refer essentially to wideband parameters such as delay spread, delay window etc. Results show a fair agreement between measured and simulated wideband parameters when link distance does not exceed 10-15 m. The influence of environment description (with or without furniture) is also analyzed.","PeriodicalId":335954,"journal":{"name":"VTC '98. 48th IEEE Vehicular Technology Conference. Pathway to Global Wireless Revolution (Cat. No.98CH36151)","volume":"2549 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":"128757173","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
CDMA soft handoff modelling: a networking approach CDMA软切换建模:一种组网方法
VTC '98. 48th IEEE Vehicular Technology Conference. Pathway to Global Wireless Revolution (Cat. No.98CH36151) Pub Date : 1998-05-18 DOI: 10.1109/VETEC.1998.686568
R. Miranda-Guardiola, C. Vargas-Rosales
{"title":"CDMA soft handoff modelling: a networking approach","authors":"R. Miranda-Guardiola, C. Vargas-Rosales","doi":"10.1109/VETEC.1998.686568","DOIUrl":"https://doi.org/10.1109/VETEC.1998.686568","url":null,"abstract":"Due to the importance of call generation and mobility in a CDMA network, a model to quantify the effects on the handoff and new calls when resources such as capacity, reservation, demand, and mobility vary is needed. In this paper a new simulation and analytical approximation model for performance evaluation of soft handoff and new calls in a CDMA environment system is proposed in order to characterize the behavior of the user's mobility.","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":"128967298","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
Space-time coded OFDM for high data-rate wireless communication over wideband channels 用于宽带信道上高数据速率无线通信的空时编码OFDM
VTC '98. 48th IEEE Vehicular Technology Conference. Pathway to Global Wireless Revolution (Cat. No.98CH36151) Pub Date : 1998-05-18 DOI: 10.1109/VETEC.1998.686154
Dakshi Agrawal, Vahid Tarokh, A. Naguib, Nambirajan Seshadri
{"title":"Space-time coded OFDM for high data-rate wireless communication over wideband channels","authors":"Dakshi Agrawal, Vahid Tarokh, A. Naguib, Nambirajan Seshadri","doi":"10.1109/VETEC.1998.686154","DOIUrl":"https://doi.org/10.1109/VETEC.1998.686154","url":null,"abstract":"There has been an increasing interest in providing high data-rate services such as video-conferencing, multimedia Internet access and wide area network over wideband wireless channels. Wideband wireless channels available in the PCS band (2 GHz) have been envisioned to be used by mobile (high Doppler) and stationary (low Doppler) units in a variety of delay spread profiles. This is a challenging task, given the limited link budget and severity of wireless environment, and calls for the development of novel robust bandwidth efficient techniques which work reliably at low SNRs. To this end, we design a space-time coded orthogonal frequency division multiplexing (OFDM) modulated physical layer. This combines coding and modulation. Space-time codes were previously proposed for narrowband wireless channels. These codes have high spectral efficiency and operate at very low SNR (within 2-3 dB of the capacity). On the other hand, OFDM has matured as a modulation scheme for wideband channels. We combine these two in a natural manner and propose a system achieving data rates of 1.5-3 Mbps over a 1 MHz bandwidth channel. This system requires 18-23 dB (resp. 9-14 dB) receive SNR at a frame error probability of 10/sup -2/ with two transmit and one receive antennas (resp. two transmit and two receive antennas). As space-time coding does not require any form of interleaving, the proposed system is attractive for delay-sensitive applications.","PeriodicalId":335954,"journal":{"name":"VTC '98. 48th IEEE Vehicular Technology Conference. Pathway to Global Wireless Revolution (Cat. No.98CH36151)","volume":"14 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":"124605208","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: 621
Root-MUSIC based joint identification and timing estimation of asynchronous CDMA system over Rayleigh fading channel 基于根- music的瑞利衰落信道异步CDMA系统联合辨识与定时估计
VTC '98. 48th IEEE Vehicular Technology Conference. Pathway to Global Wireless Revolution (Cat. No.98CH36151) Pub Date : 1998-05-18 DOI: 10.1109/VETEC.1998.686437
Wei-Chiang Wu, Kwang-Cheng Chen
{"title":"Root-MUSIC based joint identification and timing estimation of asynchronous CDMA system over Rayleigh fading channel","authors":"Wei-Chiang Wu, Kwang-Cheng Chen","doi":"10.1109/VETEC.1998.686437","DOIUrl":"https://doi.org/10.1109/VETEC.1998.686437","url":null,"abstract":"An efficient algorithm is proposed to identify the active users and extract their respective timing information in an asynchronous direct-sequence CDMA (DS-CDMA) communication system over a Rayleigh fading channel. The joint identification and timing estimation algorithm is derived by performing a discrete Fourier transform (DFT) on the observation vector and exploiting the uniqueness and nullity characteristics of the root-MUSIC test polynomial. The root-MUSIC based algorithm is shown to be asymptotically near-far resistant. Moreover, compared to the maximum a posteriori probability (MAP) or maximum likelihood (ML) based multiuser timing estimator, the complexity is greatly reduced by separating the multi-dimensional optimization problem into several polynomial rooting problems. The analytical results reveal that under the uncorrelated Rayleigh fading model, the root-MUSIC timing estimator tends to achieve the Cramer-Rao lower bound (CRLB) at interesting signature sequence length and user's signal-to-noise ratio (SNR).","PeriodicalId":335954,"journal":{"name":"VTC '98. 48th IEEE Vehicular Technology Conference. Pathway to Global Wireless Revolution (Cat. No.98CH36151)","volume":"64 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":"129482822","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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