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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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Evaluation of coding and modulation schemes based on Golay complementary sequences for efficient OFDM transmission 基于Golay互补序列的OFDM高效传输编码和调制方案评价
VTC '98. 48th IEEE Vehicular Technology Conference. Pathway to Global Wireless Revolution (Cat. No.98CH36151) Pub Date : 1998-05-18 DOI: 10.1109/VETEC.1998.686566
T. Hunziker, U. Bernhard
{"title":"Evaluation of coding and modulation schemes based on Golay complementary sequences for efficient OFDM transmission","authors":"T. Hunziker, U. Bernhard","doi":"10.1109/VETEC.1998.686566","DOIUrl":"https://doi.org/10.1109/VETEC.1998.686566","url":null,"abstract":"Block codes based on Golay complementary sequences have been proposed for orthogonal frequency division multiplexing (OFDM) transmission to obtain signals with flat envelopes. These codes confine the peak-to-average power ratio of multicarrier signals to a favorable value of 3 dB at the cost of a lower code rate. Additionally, the coding employs diversity which renders a performance improvement in frequency-selective fading channels. This paper contains a discussion on the capabilities and the limits of OFDM transmission techniques using such codes. Different coding and modulation schemes are compared and guidelines are provided for the choice of the appropriate transmission scheme. The Magic WAND (wireless ATM network demonstrator) system set-up is used to discuss the requirements of a practical system.","PeriodicalId":335954,"journal":{"name":"VTC '98. 48th IEEE Vehicular Technology Conference. Pathway to Global Wireless Revolution (Cat. No.98CH36151)","volume":"65 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":"116969831","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
Impact of estimation errors on multiuser detection in CDMA 估计误差对CDMA多用户检测的影响
VTC '98. 48th IEEE Vehicular Technology Conference. Pathway to Global Wireless Revolution (Cat. No.98CH36151) Pub Date : 1998-05-18 DOI: 10.1109/VETEC.1998.686075
L. Rasmussen, Sumei Sun, Teng Joon Lim, H. Sugimoto
{"title":"Impact of estimation errors on multiuser detection in CDMA","authors":"L. Rasmussen, Sumei Sun, Teng Joon Lim, H. Sugimoto","doi":"10.1109/VETEC.1998.686075","DOIUrl":"https://doi.org/10.1109/VETEC.1998.686075","url":null,"abstract":"A majority of multiuser detectors for CDMA are based on coherent detection where carrier frequency, carrier phase, transmission delays and channel characteristics are assumed known at the receiver. In a real system, these parameters must however be estimated based on the received signal. In this paper we investigate the impact of delay and channel estimation errors on the performance of multi-stage successive interference cancellation and limited tree-search detection. The estimation errors are modelled as zero-mean Gaussian random variables with the variance being a measure of the accuracy of the estimation.","PeriodicalId":335954,"journal":{"name":"VTC '98. 48th IEEE Vehicular Technology Conference. Pathway to Global Wireless Revolution (Cat. No.98CH36151)","volume":"70 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":"116239954","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
Multiple access protocol for an underground wireless communication network 用于地下无线通信网络的多址访问协议
VTC '98. 48th IEEE Vehicular Technology Conference. Pathway to Global Wireless Revolution (Cat. No.98CH36151) Pub Date : 1998-05-18 DOI: 10.1109/VETEC.1998.686544
Z. Yin, K. Chung
{"title":"Multiple access protocol for an underground wireless communication network","authors":"Z. Yin, K. Chung","doi":"10.1109/VETEC.1998.686544","DOIUrl":"https://doi.org/10.1109/VETEC.1998.686544","url":null,"abstract":"The MINECOM system, a versatile microcellular mobile communications network specifically designed for underground mining, is aimed at providing reliable communications for multiple channels of two-way voice, monitoring data, control signals, and eventually compressed digital video. This paper studies the multiple access technique adopted in the MINECOM network. The performance of the MINECOM protocol is analyzed in terms of throughput and average message delay by the EPA (equilibrium point analysis) method.","PeriodicalId":335954,"journal":{"name":"VTC '98. 48th IEEE Vehicular Technology Conference. Pathway to Global Wireless Revolution (Cat. No.98CH36151)","volume":"104 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":"115247059","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
Performance of ATDMA protocol in a microcellular environment ATDMA协议在微蜂窝环境下的性能
VTC '98. 48th IEEE Vehicular Technology Conference. Pathway to Global Wireless Revolution (Cat. No.98CH36151) Pub Date : 1998-05-18 DOI: 10.1109/VETEC.1998.686069
Yifan Li, J. Khan
{"title":"Performance of ATDMA protocol in a microcellular environment","authors":"Yifan Li, J. Khan","doi":"10.1109/VETEC.1998.686069","DOIUrl":"https://doi.org/10.1109/VETEC.1998.686069","url":null,"abstract":"Advanced time division multiple access (ATDMA) protocol is a new generation protocol which supports both circuit switched and packet switched transmission modes. In this paper the performance of the ATDMA protocol in a microcell environment is presented. The performance of the protocol was evaluated using a proposed block reservation scheme for an integrated voice and data traffic. The effect of block reservation scheme and capture effect on the protocol performance is investigated using a discrete event simulation model.","PeriodicalId":335954,"journal":{"name":"VTC '98. 48th IEEE Vehicular Technology Conference. Pathway to Global Wireless Revolution (Cat. No.98CH36151)","volume":"54 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":"124803008","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
An adaptive modulation scheme for simultaneous voice and data transmission over fading channels 一种用于在衰落信道上同时进行语音和数据传输的自适应调制方案
VTC '98. 48th IEEE Vehicular Technology Conference. Pathway to Global Wireless Revolution (Cat. No.98CH36151) Pub Date : 1998-05-18 DOI: 10.1109/VETEC.1998.686378
Mohamed-Slim Alouini, X. Tang, A. Goldsmith
{"title":"An adaptive modulation scheme for simultaneous voice and data transmission over fading channels","authors":"Mohamed-Slim Alouini, X. Tang, A. Goldsmith","doi":"10.1109/VETEC.1998.686378","DOIUrl":"https://doi.org/10.1109/VETEC.1998.686378","url":null,"abstract":"We propose a new adaptive modulation technique for simultaneous voice and data transmission over fading channels, and study its performance. The proposed scheme takes advantage of the time-varying nature of fading to dynamically allocate the transmitted power between the inphase (I) and quadrature (Q) channels. It uses fixed-rate binary phase shift keying (BPSK) modulation on the Q channel for voice, and variable-rate M-ary amplitude modulation (M-AM) on the I channel for data. For favorable channel conditions most of the power is allocated to high rate data transmission on the I channel. The remaining power is used to support the variable-power voice transmission on the Q channel. As the channel degrades the modulation gradually reduces its data throughput and reallocates most of its available power to insure a continuous and satisfactory voice transmission. The scheme is intended to provide a high average spectral efficiency for data communications while meeting the stringent delay requirements imposed by voice. We present closed-form expressions as well as numerical and simulation results for the outage probability, average allocated power, achievable spectral efficiency, and average bit-error-rate for both voice and data, transmission over Nakagami-m (1960) fading channels. We also discuss the features and advantages of the proposed scheme.","PeriodicalId":335954,"journal":{"name":"VTC '98. 48th IEEE Vehicular Technology Conference. Pathway to Global Wireless Revolution (Cat. No.98CH36151)","volume":"86 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":"123533475","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: 160
Radio resource assignment for multimedia services in multiple-chip-rate DS/CDMA systems 多片率DS/CDMA系统中多媒体业务的无线电资源分配
VTC '98. 48th IEEE Vehicular Technology Conference. Pathway to Global Wireless Revolution (Cat. No.98CH36151) Pub Date : 1998-05-18 DOI: 10.1109/VETEC.1998.686516
Y.W. Kim, S. Lee, M. Chung, Y. Kwon, D. Sung
{"title":"Radio resource assignment for multimedia services in multiple-chip-rate DS/CDMA systems","authors":"Y.W. Kim, S. Lee, M. Chung, Y. Kwon, D. Sung","doi":"10.1109/VETEC.1998.686516","DOIUrl":"https://doi.org/10.1109/VETEC.1998.686516","url":null,"abstract":"This paper is concerned with radio resource allocation in multiple-chip-rate (MCR) DS/CDMA systems accommodating multimedia services with different information rates and quality requirements. Considering power spectral density (PSD) over a radio frequency (RF) band and the effect of RF input filtering on the receiver in MCR-DS/CDMA systems, we present criteria for capacity estimation and clarify the characteristics of subsystems. The system performance in MCR-DS/CDMA systems is strongly affected by radio resource assignment. A minimum power-increment-based resource assignment scheme and a random-based resource assignment scheme are proposed. The performance of both schemes are compared in terms of blocking probability and normalized throughput. The minimum power-increment-based resource assignment scheme yields a better performance than the random-based resource assignment scheme for multimedia services.","PeriodicalId":335954,"journal":{"name":"VTC '98. 48th IEEE Vehicular Technology Conference. Pathway to Global Wireless Revolution (Cat. No.98CH36151)","volume":"66 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":"123550335","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
Statistical distribution of path interarrivaltimes in indoor environment 室内环境下路径间隔到达时间的统计分布
VTC '98. 48th IEEE Vehicular Technology Conference. Pathway to Global Wireless Revolution (Cat. No.98CH36151) Pub Date : 1998-05-18 DOI: 10.1109/VETEC.1998.686634
R. Kattenbach
{"title":"Statistical distribution of path interarrivaltimes in indoor environment","authors":"R. Kattenbach","doi":"10.1109/VETEC.1998.686634","DOIUrl":"https://doi.org/10.1109/VETEC.1998.686634","url":null,"abstract":"Interarrivaltimes of paths are investigated with respect to their statistical distribution on the basis of a total amount of 5606 impulse responses measured in 63 different scenarios in an indoor environment. For the detection of paths, an algorithm denoted as \"path tracking\" is applied, which enables the determination of physically reasonable paths. Evaluation is done by the examination of the frequency distributions of errors when fitting theoretical distribution functions to measured data. An exponential interarrivaltime distribution, as occurring for a standard Poisson process, shows poor correspondence, whereas a Weibull distribution turns out to be very well applicable. A plausible explanation for the applicability of the Weibull distribution for describing the distribution of interarrivaltimes, which was missing up to now, is also given.","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":"123636771","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
Experimental evaluation of fading reduction and diversity gain for smart antenna systems 智能天线系统衰落抑制和分集增益的实验评估
VTC '98. 48th IEEE Vehicular Technology Conference. Pathway to Global Wireless Revolution (Cat. No.98CH36151) Pub Date : 1998-05-18 DOI: 10.1109/VETEC.1998.683707
S. Jeng, G. Okamoto, Guanghan Xu
{"title":"Experimental evaluation of fading reduction and diversity gain for smart antenna systems","authors":"S. Jeng, G. Okamoto, Guanghan Xu","doi":"10.1109/VETEC.1998.683707","DOIUrl":"https://doi.org/10.1109/VETEC.1998.683707","url":null,"abstract":"In wireless communications, the smart antenna systems (or antenna arrays) can be used to suppress multipath fading effects with antenna diversity and to increase system capacity by supporting multiple co-channel users in reception and transmission. This paper presents experimental results of diversity gain and mitigation of multipath fading obtained by using a smart antenna system in typical wireless scenarios.","PeriodicalId":335954,"journal":{"name":"VTC '98. 48th IEEE Vehicular Technology Conference. Pathway to Global Wireless Revolution (Cat. No.98CH36151)","volume":"45 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":"121759426","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
Data capacity of TDMA/FDMA systems with adaptive modulation 自适应调制TDMA/FDMA系统的数据容量
VTC '98. 48th IEEE Vehicular Technology Conference. Pathway to Global Wireless Revolution (Cat. No.98CH36151) Pub Date : 1998-05-18 DOI: 10.1109/VETEC.1998.683719
T. A. Fry, Chung-Chieh Lee, M. Honig
{"title":"Data capacity of TDMA/FDMA systems with adaptive modulation","authors":"T. A. Fry, Chung-Chieh Lee, M. Honig","doi":"10.1109/VETEC.1998.683719","DOIUrl":"https://doi.org/10.1109/VETEC.1998.683719","url":null,"abstract":"We develop an analytical model to analyze the data capacity of a TDMA/FDMA system with adaptive modulation. Our model defines data capacity as the maximum average data throughput per channel, and includes packet retransmissions due to user movement and channel estimation error. We study a TDMA/FDMA system with a simple channel model to evaluate the performance bound on data capacity, and then incorporate retransmissions to determine how they affect data capacity. Our model provides a baseline for the study and analysis of the performance of adaptive modulation TDMA/FDMA systems.","PeriodicalId":335954,"journal":{"name":"VTC '98. 48th IEEE Vehicular Technology Conference. Pathway to Global Wireless Revolution (Cat. No.98CH36151)","volume":"31 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":"122529274","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
Improved performance of Reed-Solomon decoding with the use of pilot signals for erasure generation 改进了里德-所罗门解码的性能，使用导频信号进行擦除生成
VTC '98. 48th IEEE Vehicular Technology Conference. Pathway to Global Wireless Revolution (Cat. No.98CH36151) Pub Date : 1998-05-18 DOI: 10.1109/VETEC.1998.686092
L. Weiburn, J. Cavers
{"title":"Improved performance of Reed-Solomon decoding with the use of pilot signals for erasure generation","authors":"L. Weiburn, J. Cavers","doi":"10.1109/VETEC.1998.686092","DOIUrl":"https://doi.org/10.1109/VETEC.1998.686092","url":null,"abstract":"The performance of a Reed-Solomon (RS) decoder can be improved by allowing errors and erasures (E&E) decoding if each error location is correctly identified, or \"flagged\", and considered as an erasure. However, in order to be effective, it is imperative that the erasure flagging is accurate. We propose the use of pilot signals in a new method for flagging erasures. A Bayesian method for optimum character erasure flagging is derived which uses both the received data signals and the channel estimates provided by pilot signals, and a simpler method is presented which flags erasures on a modulation symbol basis. Our simulation results demonstrate that combining pilot signals with E&E decoding results in significant transmit power savings.","PeriodicalId":335954,"journal":{"name":"VTC '98. 48th IEEE Vehicular Technology Conference. Pathway to Global Wireless Revolution (Cat. No.98CH36151)","volume":"5 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":"122722199","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
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