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Gateway to 21st Century Communications Village. VTC 1999-Fall. IEEE VTS 50th Vehicular Technology Conference (Cat. No.99CH36324)最新文献

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MAI mitigation in DA ML carrier phase recovery loops for DS-CDMA systems DS-CDMA系统中DA - ML载波相位恢复环路的MAI抑制
Gateway to 21st Century Communications Village. VTC 1999-Fall. IEEE VTS 50th Vehicular Technology Conference (Cat. No.99CH36324) Pub Date : 1999-09-19 DOI: 10.1109/VETECF.1999.801717
L. Schumacher, L. Vandendorpe
{"title":"MAI mitigation in DA ML carrier phase recovery loops for DS-CDMA systems","authors":"L. Schumacher, L. Vandendorpe","doi":"10.1109/VETECF.1999.801717","DOIUrl":"https://doi.org/10.1109/VETECF.1999.801717","url":null,"abstract":"This paper analytically investigates maximum-likelihood (ML) phase recovery in a multiuser system granting access through the direct sequence-code division multiple access (DS-CDMA) technique. A data-aided (DA) phase recovery loop is designed to face multiple access interference (MAI). Open- and closed-loop behaviour are studied and illustrated by computations. It is shown that the multiuser phase estimator mitigates MAI and exhibits a smaller variance than the single-user one.","PeriodicalId":355729,"journal":{"name":"Gateway to 21st Century Communications Village. VTC 1999-Fall. IEEE VTS 50th Vehicular Technology Conference (Cat. No.99CH36324)","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-09-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126454533","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
Applying pattern recognition techniques based on hidden Markov models for vehicular position location in cellular networks 基于隐马尔可夫模型的模式识别技术在蜂窝网络车辆位置定位中的应用
Gateway to 21st Century Communications Village. VTC 1999-Fall. IEEE VTS 50th Vehicular Technology Conference (Cat. No.99CH36324) Pub Date : 1999-09-19 DOI: 10.1109/VETECF.1999.798435
Stefan Mangold, S. Kyriazakos
{"title":"Applying pattern recognition techniques based on hidden Markov models for vehicular position location in cellular networks","authors":"Stefan Mangold, S. Kyriazakos","doi":"10.1109/VETECF.1999.798435","DOIUrl":"https://doi.org/10.1109/VETECF.1999.798435","url":null,"abstract":"Field trials of subscriber locations in a cellular network are discussed. The vehicular position location applied is a hybrid method based on pattern recognition and time of arrival (TOA) measurements. The pattern recognition is performed by hidden Markov models (HMMs) trained with prediction data to model the strength of the received signals for particular areas. The TOA gives first estimations of where the active mobile is located and which set of HMMs is to be used for the position estimation. To assess the accuracy of the proposed location method, calls have been performed from a car, driving through various streets and timing advance (TA) zones in a single GSM cell. The results are quite optimistic; the solution may fulfil the demand of many subscriber location applications, without requiring any modifications of existing standards, infrastructure or the mobiles.","PeriodicalId":355729,"journal":{"name":"Gateway to 21st Century Communications Village. VTC 1999-Fall. IEEE VTS 50th Vehicular Technology Conference (Cat. No.99CH36324)","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-09-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125897663","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: 53
Adaptive modulation and scheduling of IP traffic over fading channels 衰落信道上IP流量的自适应调制和调度
Gateway to 21st Century Communications Village. VTC 1999-Fall. IEEE VTS 50th Vehicular Technology Conference (Cat. No.99CH36324) Pub Date : 1999-09-19 DOI: 10.1109/VETECF.1999.798449
Nilo CasimiroEricsson SignalsandSystems
{"title":"Adaptive modulation and scheduling of IP traffic over fading channels","authors":"Nilo CasimiroEricsson SignalsandSystems","doi":"10.1109/VETECF.1999.798449","DOIUrl":"https://doi.org/10.1109/VETECF.1999.798449","url":null,"abstract":"In future packet based wireless communication systems, transmission in the downlink will often dominate the traffic load. An obstacle in this context is the time-variability of the channel. To achieve a high throughput also over fading channels, adaptive methods for adjustment of, for example, the modulation alphabet, and the coding complexity, can be used. We investigate the effect of adaptive modulation, along with time-slot scheduling of IP-like traffic in a scenario involving several types of mobile hosts and one base station. We extend a study of the impact of adaptive modulation and scheduling on the bit error rate, to include models for packet length and packet inter-arrival, to find the queueing delay imposed by our proposed scheduling algorithm. Our scheduler keeps the bit error rate at attractively low, prespecified levels, well suited for forward error correction (FEC) codes. Moreover, the scheduler splits the bandwidth between different types of traffic in a desirable way, according to the traffic situation.","PeriodicalId":355729,"journal":{"name":"Gateway to 21st Century Communications Village. VTC 1999-Fall. IEEE VTS 50th Vehicular Technology Conference (Cat. No.99CH36324)","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-09-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130101543","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: 31
Coded modulation using differential encoding over Rayleigh fading channels 在瑞利衰落信道上使用差分编码的编码调制
Gateway to 21st Century Communications Village. VTC 1999-Fall. IEEE VTS 50th Vehicular Technology Conference (Cat. No.99CH36324) Pub Date : 1999-09-19 DOI: 10.1109/VETECF.1999.800233
R. Fischer, L. Lampe, S. Calabrò, S. H. Muller-Weinfurtner
{"title":"Coded modulation using differential encoding over Rayleigh fading channels","authors":"R. Fischer, L. Lampe, S. Calabrò, S. H. Muller-Weinfurtner","doi":"10.1109/VETECF.1999.800233","DOIUrl":"https://doi.org/10.1109/VETECF.1999.800233","url":null,"abstract":"Multilevel coding and bit-interleaved coded modulation using differential encoding and non-coherent reception over flat fading channels are assessed. In order to achieve high bandwidth efficiencies differential encoding is done with respect to phase, as well as with respect to amplitude of APSK constellations. Assuming the channel to be slowly time-varying, encoding and detection are based on blocks of N consecutive symbols (multiple symbol detection). In this paper, we provide the code design and present simulation results. It is shown that only for multilevel coding multiple symbol detection provides significant gains.","PeriodicalId":355729,"journal":{"name":"Gateway to 21st Century Communications Village. VTC 1999-Fall. IEEE VTS 50th Vehicular Technology Conference (Cat. No.99CH36324)","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-09-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130121619","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
Space-time codes for fading channels 衰落信道的空时编码
Gateway to 21st Century Communications Village. VTC 1999-Fall. IEEE VTS 50th Vehicular Technology Conference (Cat. No.99CH36324) Pub Date : 1999-09-19 DOI: 10.1109/VETECF.1999.800131
A. Yongaçoğlu, M. Siala
{"title":"Space-time codes for fading channels","authors":"A. Yongaçoğlu, M. Siala","doi":"10.1109/VETECF.1999.800131","DOIUrl":"https://doi.org/10.1109/VETECF.1999.800131","url":null,"abstract":"Space-time codes are designed for efficient transmission using multiple transmit antennas. In this paper, we propose space-time codes which combine the Ungerboeck one-size larger constellation principle with the simple transmit diversity technique of Alamouti (1998). The proposed codes provide several dB additional coding gain over the well-known space-time codes while keeping the complexity almost the same.","PeriodicalId":355729,"journal":{"name":"Gateway to 21st Century Communications Village. VTC 1999-Fall. IEEE VTS 50th Vehicular Technology Conference (Cat. No.99CH36324)","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-09-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129285823","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: 27
OFDM timing synchronisation: Possibilities and limits to the usage of the cyclic prefix for maximum likelihood estimation OFDM定时同步:最大似然估计使用循环前缀的可能性和限制
Gateway to 21st Century Communications Village. VTC 1999-Fall. IEEE VTS 50th Vehicular Technology Conference (Cat. No.99CH36324) Pub Date : 1999-09-19 DOI: 10.1109/VETECF.1999.798413
D. Matic, T. Coenen, F.C. Schoute, R. Prasad
{"title":"OFDM timing synchronisation: Possibilities and limits to the usage of the cyclic prefix for maximum likelihood estimation","authors":"D. Matic, T. Coenen, F.C. Schoute, R. Prasad","doi":"10.1109/VETECF.1999.798413","DOIUrl":"https://doi.org/10.1109/VETECF.1999.798413","url":null,"abstract":"This paper presents an investigation of the possibilities for correcting the phase of the sampling clock with the non-data-aided (NDA) synchronisation using cyclic prefix for OFDM (orthogonal frequency division multiplex) symbol timing in a fully digital implementation. The redundancy of the cyclic prefix, which is introduced as an absorber of the channel multipath, can also be employed for the estimation of the sampling-time offset. This method is essentially an autocorrelation, what has fundamental repercussions to its final precision. Another implementation issue was also taken into account-efficient usage of the spectrum by pulse shaping in the time domain. The paper presents the study of the original maximum likelihood method and its possible improvements.","PeriodicalId":355729,"journal":{"name":"Gateway to 21st Century Communications Village. VTC 1999-Fall. IEEE VTS 50th Vehicular Technology Conference (Cat. No.99CH36324)","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-09-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128522152","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
MMSE delay estimation in CDMA system CDMA系统中MMSE时延估计
Gateway to 21st Century Communications Village. VTC 1999-Fall. IEEE VTS 50th Vehicular Technology Conference (Cat. No.99CH36324) Pub Date : 1999-09-19 DOI: 10.1109/VETECF.1999.798427
J. Joutsensalo, T. Ristaniemi
{"title":"MMSE delay estimation in CDMA system","authors":"J. Joutsensalo, T. Ristaniemi","doi":"10.1109/VETECF.1999.798427","DOIUrl":"https://doi.org/10.1109/VETECF.1999.798427","url":null,"abstract":"In this paper, we propose an MMSE sense optimal approach for single user code acquisition in the CDMA communication system. It is assumed that the training sequence is sent to the desired user. The method is based on quite similar optimization criterion as that of interference suppressing MMSE demodulators. Using the training signal, the performance can be greatly improved without increasing computational complexity. Simulations show that the method outperforms, e.g. CMOE method, maximum likelihood method, eigenvector-based MUSIC, and matched filter.","PeriodicalId":355729,"journal":{"name":"Gateway to 21st Century Communications Village. VTC 1999-Fall. IEEE VTS 50th Vehicular Technology Conference (Cat. No.99CH36324)","volume":"52 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-09-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124862520","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
Soft-decision redundant residue number system based error correction coding 基于软判决冗余数系统的纠错编码
Gateway to 21st Century Communications Village. VTC 1999-Fall. IEEE VTS 50th Vehicular Technology Conference (Cat. No.99CH36324) Pub Date : 1999-09-19 DOI: 10.1109/VETECF.1999.800245
T. Liew, L. Yang, L. Hanzo
{"title":"Soft-decision redundant residue number system based error correction coding","authors":"T. Liew, L. Yang, L. Hanzo","doi":"10.1109/VETECF.1999.800245","DOIUrl":"https://doi.org/10.1109/VETECF.1999.800245","url":null,"abstract":"Soft-decision-based redundant residue number system (RRNS)-assisted error control coding is proposed and its performance is evaluated. An RRNS(n,k) code is a maximum-minimum distance block code, exhibiting identical distance properties to Reed-Solomon (RS) codes. Hence their error correction capability is given by t=(n-k)/2. Different bit mapping methods are proposed, which result in systematic and non-systematic RRNS encoders. We show that the classic Chase algorithm can be invoked, in order to contrive soft-decision detection for RRNS codes and to exploit the soft channel outputs, which provide the relative reliability of each of the received binary digits. We found that soft decision-based RRNS decoding is at least 1.5 dB better compared to hard decision-assisted RRNS decoding.","PeriodicalId":355729,"journal":{"name":"Gateway to 21st Century Communications Village. VTC 1999-Fall. IEEE VTS 50th Vehicular Technology Conference (Cat. No.99CH36324)","volume":"40 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-09-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125047427","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: 24
Dynamic bit rate assignment in wireless CDMA data transmissions 无线CDMA数据传输中的动态比特率分配
Gateway to 21st Century Communications Village. VTC 1999-Fall. IEEE VTS 50th Vehicular Technology Conference (Cat. No.99CH36324) Pub Date : 1999-09-19 DOI: 10.1109/VETECF.1999.800305
A. Abrardo, G. Benelli, G. Giambene, D. Sennati
{"title":"Dynamic bit rate assignment in wireless CDMA data transmissions","authors":"A. Abrardo, G. Benelli, G. Giambene, D. Sennati","doi":"10.1109/VETECF.1999.800305","DOIUrl":"https://doi.org/10.1109/VETECF.1999.800305","url":null,"abstract":"This paper compares different schemes that can be used to improve the performance of CDMA in wireless data systems. In particular, we consider a closed-loop power control scheme and an adaptive coding scheme. The comparison between these different techniques is performed in terms of mean transmission time and energy efficiency. Our aim is to show that an adaptive coding scheme can allow good performance with respect to typical power control techniques.","PeriodicalId":355729,"journal":{"name":"Gateway to 21st Century Communications Village. VTC 1999-Fall. IEEE VTS 50th Vehicular Technology Conference (Cat. No.99CH36324)","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-09-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125088574","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
On the suitability of GPRS for integrating ITS with non-ITS traffic 浅谈GPRS集成ITS与非ITS业务的适用性
Gateway to 21st Century Communications Village. VTC 1999-Fall. IEEE VTS 50th Vehicular Technology Conference (Cat. No.99CH36324) Pub Date : 1999-09-19 DOI: 10.1109/VETECF.1999.798431
J. Pereira
{"title":"On the suitability of GPRS for integrating ITS with non-ITS traffic","authors":"J. Pereira","doi":"10.1109/VETECF.1999.798431","DOIUrl":"https://doi.org/10.1109/VETECF.1999.798431","url":null,"abstract":"The intelligent transportation systems (ITS) will responsible for only a small fraction of the overall data traffic services carried by cellular networks, especially as the mobile multimedia traffic increases in evolved second generation systems. As such, ITS with its mainly short and bursty transactions, will piggyback perfectly on such a mobile multimedia background. We compare CDPD (Cellular Digital Packet Data), the US packet data overlay on analogue AMPS, with GPRS (General Packet Radio Service), the packet-switched service soon to be commercially available over GSM, for the purpose of carrying ITS on top of non-ITS traffic. With GPRS, ITS traffic is less affected by the non-ITS traffic (smaller delays in the presence of \"heavy\" users, and higher effective throughput) for the same traffic mixture. This, however, relies upon proper resource and load management in GPRS.","PeriodicalId":355729,"journal":{"name":"Gateway to 21st Century Communications Village. VTC 1999-Fall. IEEE VTS 50th Vehicular Technology Conference (Cat. No.99CH36324)","volume":"374 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-09-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115987923","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
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