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IEEE 54th Vehicular Technology Conference. VTC Fall 2001. Proceedings (Cat. No.01CH37211)最新文献

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Pre-equalization technique for interference cancellation in the UMTS-TDD downlink channel UMTS-TDD下行信道中干扰消除的预均衡技术
IEEE 54th Vehicular Technology Conference. VTC Fall 2001. Proceedings (Cat. No.01CH37211) Pub Date : 2001-10-07 DOI: 10.1109/VTC.2001.956898
António Morgado, P. Pinho, A. Gameiro, J. Fernandes
{"title":"Pre-equalization technique for interference cancellation in the UMTS-TDD downlink channel","authors":"António Morgado, P. Pinho, A. Gameiro, J. Fernandes","doi":"10.1109/VTC.2001.956898","DOIUrl":"https://doi.org/10.1109/VTC.2001.956898","url":null,"abstract":"This paper proposes a technique aiming to simplify the mobile terminals by transferring as much as possible the complex operations to the base station. A pre-equalization technique is proposed for the downlink channel of UMTS TDD, which allows the use of simpler receiver schemes in the mobile unit. After the mathematical background, simulation results obtained in typical scenarios, using statistical channel models, are presented to demonstrate the performance of the proposed method. Several levels of correlation between the propagation channels that can be considered to exist between the different base station antenna array elements and the desired mobile unit were considered. The results have shown that that significant performance gains can be achieved in high multiple access interference (MAI) environments.","PeriodicalId":129008,"journal":{"name":"IEEE 54th Vehicular Technology Conference. VTC Fall 2001. Proceedings (Cat. No.01CH37211)","volume":"194-199 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-10-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130676539","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: 5
An architecture for signaling load comparison for GSM and IS41/136 systems GSM和IS41/136系统信令负载比较的体系结构
IEEE 54th Vehicular Technology Conference. VTC Fall 2001. Proceedings (Cat. No.01CH37211) Pub Date : 2001-10-07 DOI: 10.1109/VTC.2001.957234
Thienne Mesquita, Obionor O. Nóbrega, D. Sadok
{"title":"An architecture for signaling load comparison for GSM and IS41/136 systems","authors":"Thienne Mesquita, Obionor O. Nóbrega, D. Sadok","doi":"10.1109/VTC.2001.957234","DOIUrl":"https://doi.org/10.1109/VTC.2001.957234","url":null,"abstract":"The advent of second and third generation cellular systems forces cellular operators to face a considerable increase in the signaling traffic over their mobile networks. Service providers are therefore required to have appropriate planning tools in order to maintain adequate service quality levels. This paper presents a proposal of a simulation architecture for the analysis of signaling in GSM and IS41/136 mobile cellular networks. Procedures like power up, power down, call setup, handover and location updating are implemented. The simulation tool CELSA (cellular signaling analyzer) has implemented this architecture. Simulation results for exchanged signaling load in an example network architecture are presented.","PeriodicalId":129008,"journal":{"name":"IEEE 54th Vehicular Technology Conference. VTC Fall 2001. Proceedings (Cat. No.01CH37211)","volume":"49 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-10-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123664489","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
Verification of WCDMA radio network planning prediction methods with fully dynamic network simulator 基于全动态网络模拟器的WCDMA无线网络规划预测方法验证
IEEE 54th Vehicular Technology Conference. VTC Fall 2001. Proceedings (Cat. No.01CH37211) Pub Date : 2001-10-07 DOI: 10.1109/VTC.2001.956656
J. Laiho, A. Wacker, T. Novosad, A. Hämäläinen
{"title":"Verification of WCDMA radio network planning prediction methods with fully dynamic network simulator","authors":"J. Laiho, A. Wacker, T. Novosad, A. Hämäläinen","doi":"10.1109/VTC.2001.956656","DOIUrl":"https://doi.org/10.1109/VTC.2001.956656","url":null,"abstract":"The WCDMA based cellular systems offer variability of packet and circuit switched services and therefore are more complicated to plan and control than today's networks. For an operator, it is essential to utilise all possible resources to improve the capacity and quality of service of the radio network. To guarantee the optimum performance, the operator must have means to visualise the offered services and their quality in the radio network-planning phase. The proposed static prediction method is compared with dynamic analysis results. Based on this comparison it is demonstrated that the static prediction method is accurate enough for the radio network planning process. Example results of active set size, dominance and transmit power distributions from both simulators are presented.","PeriodicalId":129008,"journal":{"name":"IEEE 54th Vehicular Technology Conference. VTC Fall 2001. Proceedings (Cat. No.01CH37211)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-10-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116469300","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: 25
Performance analysis of a 2-stage groupwise successive interference cancellation scheme with groupwise power disparities in DS/CDMA systems DS/CDMA系统中具有群功率差的2级群逐次干扰抵消方案的性能分析
IEEE 54th Vehicular Technology Conference. VTC Fall 2001. Proceedings (Cat. No.01CH37211) Pub Date : 2001-10-07 DOI: 10.1109/VTC.2001.956499
Chiho Lee, Gwangzeen Ko, Kiseon Kim
{"title":"Performance analysis of a 2-stage groupwise successive interference cancellation scheme with groupwise power disparities in DS/CDMA systems","authors":"Chiho Lee, Gwangzeen Ko, Kiseon Kim","doi":"10.1109/VTC.2001.956499","DOIUrl":"https://doi.org/10.1109/VTC.2001.956499","url":null,"abstract":"We propose a 2-stage GSIC scheme considering a strict delay constraint and analyze its BER performance in single and multi-cell DS/CDMA systems. Groupwise power disparity is applied in order to enhance the BER performance. We compare the BER performance, complexity and delay of the proposed 2-stage GSIC scheme with those of both conventional detection scheme and SIC scheme. Analysis results show that the capacity increase obtained by both 2-stage GSIC scheme and SIC scheme is smaller in a multicell model than in a single cell model. BER performance enhancement by the proposed 2-stage GSIC scheme is appropriate regarding the minimal increase in cancellation delay and computational complexity. For example, in a multicell DS/CDMA system, the proposed 2-stage GSIC scheme can enhance the user capacity about 21% at BER=10/sup -2/ with twice the cancellation delay and complexity compared with the conventional detection scheme, while the pure SIC scheme can enhance the user capacity 33% with K and K/sup 2/ times increase in delay and complexity, respectively, where K is the number of concurrent users.","PeriodicalId":129008,"journal":{"name":"IEEE 54th Vehicular Technology Conference. VTC Fall 2001. Proceedings (Cat. No.01CH37211)","volume":"857 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-10-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114846052","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
A hybrid ARQ scheme with power ramping 一种带有功率斜坡的混合ARQ方案
IEEE 54th Vehicular Technology Conference. VTC Fall 2001. Proceedings (Cat. No.01CH37211) Pub Date : 2001-10-07 DOI: 10.1109/VTC.2001.956464
Seung-Hoon Hwang, Bonghoe Kim, Young-Sam Kim
{"title":"A hybrid ARQ scheme with power ramping","authors":"Seung-Hoon Hwang, Bonghoe Kim, Young-Sam Kim","doi":"10.1109/VTC.2001.956464","DOIUrl":"https://doi.org/10.1109/VTC.2001.956464","url":null,"abstract":"We propose and analyze a scheme for wireless channels, which is a combination of a hybrid type I automatic repeat request (ARQ) scheme and a power ramping. In the hybrid type I ARQ scheme, the same redundancy bits for error correction is transmitted repeatedly when a negative acknowledgment (NAK) is obtained. In addition to the ARQ scheme, the power ramping is considered for more reliable downlink data transmission, in which the transmission power is gradually changed from a small level to large levels when the number of retransmission increases. This is done without any knowledge of the channels at the transmitter. Simulation results show that by applying the combined hybrid ARQ and power ramping scheme with properly selected parameters, it has a throughput advantage of 3-5%.","PeriodicalId":129008,"journal":{"name":"IEEE 54th Vehicular Technology Conference. VTC Fall 2001. Proceedings (Cat. No.01CH37211)","volume":"48 18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-10-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124049071","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
Performance of a three-branch orthogonal polarization diversity scheme 一种三支路正交极化分集方案的性能
IEEE 54th Vehicular Technology Conference. VTC Fall 2001. Proceedings (Cat. No.01CH37211) Pub Date : 2001-10-07 DOI: 10.1109/VTC.2001.957101
L. Lukama, K. Konstantinou, D. Edwards
{"title":"Performance of a three-branch orthogonal polarization diversity scheme","authors":"L. Lukama, K. Konstantinou, D. Edwards","doi":"10.1109/VTC.2001.957101","DOIUrl":"https://doi.org/10.1109/VTC.2001.957101","url":null,"abstract":"The performance of a three-branch orthogonal polarization scheme consisting of one vertically polarized and two orthogonal horizontally polarized antennas at the receiver with a horizontally and vertically polarized transmitter is investigated. The paper shows that such a scheme provides diversity improvement of about 2dB more than the dual-branch system. Also the signals received at the three branches are highly uncorrelated. This scheme can make significant improvements in the link budget of a mobile network.","PeriodicalId":129008,"journal":{"name":"IEEE 54th Vehicular Technology Conference. VTC Fall 2001. Proceedings (Cat. No.01CH37211)","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-10-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126358083","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: 25
Performance evaluation of cellular SDMA/TDMA systems with variable bit rate multimedia traffic 可变比特率多媒体业务的蜂窝SDMA/TDMA系统性能评估
IEEE 54th Vehicular Technology Conference. VTC Fall 2001. Proceedings (Cat. No.01CH37211) Pub Date : 2001-10-07 DOI: 10.1109/VTC.2001.956496
Y. Hara, T. Nabetani, S. Hara
{"title":"Performance evaluation of cellular SDMA/TDMA systems with variable bit rate multimedia traffic","authors":"Y. Hara, T. Nabetani, S. Hara","doi":"10.1109/VTC.2001.956496","DOIUrl":"https://doi.org/10.1109/VTC.2001.956496","url":null,"abstract":"This paper presents the performance of cellular SDMA/TDMA systems with variable bit rate traffic. We employ a time slot assignment algorithm, which assigns a time slot to a new user considering not only the signal quality of the new user, but also that of active users. To support different multimedia services, a modulation scheme is adaptively selected according to the QoS (quality of service) requirement. Blocking probability, forced termination probability, and average delay of different services are evaluated in a cellular environment.","PeriodicalId":129008,"journal":{"name":"IEEE 54th Vehicular Technology Conference. VTC Fall 2001. Proceedings (Cat. No.01CH37211)","volume":"377 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-10-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126542101","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
Modeling handover in mobile satellite diversity based systems 基于移动卫星分集系统的建模切换
IEEE 54th Vehicular Technology Conference. VTC Fall 2001. Proceedings (Cat. No.01CH37211) Pub Date : 2001-10-07 DOI: 10.1109/VTC.2001.956570
M. Gkizeli, R. Tafazolli, B. Evans
{"title":"Modeling handover in mobile satellite diversity based systems","authors":"M. Gkizeli, R. Tafazolli, B. Evans","doi":"10.1109/VTC.2001.956570","DOIUrl":"https://doi.org/10.1109/VTC.2001.956570","url":null,"abstract":"The objective of this paper is to analyse the impact of different handover strategies on the service quality and network efficiency of non-GEO satellite diversity based systems. To this end, a quantitative analysis by computer simulation of different handover algorithms for mobile satellite diversity based systems is presented. The statistical but predefined nature of the constellation dynamics as well as the influence of the propagation channel in the handover mechanism enables the assessment of different levels of power and time hysteresis for different satellites within the network. Based on the above, two handover algorithms are proposed for different modes of handover operation and compared with existing handover schemes by means of case studies in suburban environments for a LEO and a MEO satellite constellation. The analysis includes the simulation of the constellations and the elevation dependent satellite channel.","PeriodicalId":129008,"journal":{"name":"IEEE 54th Vehicular Technology Conference. VTC Fall 2001. Proceedings (Cat. No.01CH37211)","volume":"98 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-10-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130019242","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
Fast acquisition scheme and implementation of PRACH in WCDMA system PRACH在WCDMA系统中的快速采集方案及实现
IEEE 54th Vehicular Technology Conference. VTC Fall 2001. Proceedings (Cat. No.01CH37211) Pub Date : 2001-10-07 DOI: 10.1109/VTC.2001.956490
Ling Qiu, Yongjia Huang, Jinkang Zhu
{"title":"Fast acquisition scheme and implementation of PRACH in WCDMA system","authors":"Ling Qiu, Yongjia Huang, Jinkang Zhu","doi":"10.1109/VTC.2001.956490","DOIUrl":"https://doi.org/10.1109/VTC.2001.956490","url":null,"abstract":"The performance and implementation of PRACH (physical random access channel) acquisition in WCDMA system is investigated. The analysis shows that the conventional methods are not satisfying. Thus we proposed the quasi-matched filter acquisition scheme of PRACH preamble which based on fast Hadamard transform. We implement this method by hardware in the practical WCDMA field trial system. The simulation and test results show that the proposed scheme achieves the following performance: the detection probability with E/sub b//N/sub 0/ =7 dB is not less than 95%, and the mean acquisition time is less than 1.33 ms.","PeriodicalId":129008,"journal":{"name":"IEEE 54th Vehicular Technology Conference. VTC Fall 2001. Proceedings (Cat. No.01CH37211)","volume":"277 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-10-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134317125","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
Using time advance information to choose coding scheme in GPRS 利用时间提前信息选择GPRS的编码方案
IEEE 54th Vehicular Technology Conference. VTC Fall 2001. Proceedings (Cat. No.01CH37211) Pub Date : 2001-10-07 DOI: 10.1109/VTC.2001.956832
R. Ferrús, F. Casadevall
{"title":"Using time advance information to choose coding scheme in GPRS","authors":"R. Ferrús, F. Casadevall","doi":"10.1109/VTC.2001.956832","DOIUrl":"https://doi.org/10.1109/VTC.2001.956832","url":null,"abstract":"GPRS defines four coding schemes named from CS-1 to CS-4 with different degrees of data protection against transmission errors in the air interface. The former coding scheme is already used in GSM and the others sequentially offer higher throughput rates but less protection. The selection of the best suited coding scheme could be based on link quality estimators but also on more deterministic system parameters such as time advance (TA) information. This paper analyses this latter option and provides results in order to quantify the feasibility of such allocation based on the time advance information. Aspects such as TA resolution, cell coverage, power control policies and system load are taken into consideration.","PeriodicalId":129008,"journal":{"name":"IEEE 54th Vehicular Technology Conference. VTC Fall 2001. Proceedings (Cat. No.01CH37211)","volume":"110 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-10-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131515240","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
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