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VTC2000-Spring. 2000 IEEE 51st Vehicular Technology Conference Proceedings (Cat. No.00CH37026)最新文献

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Combined coding and spreading in downlink CDMA systems 下行CDMA系统的组合编码与扩频
VTC2000-Spring. 2000 IEEE 51st Vehicular Technology Conference Proceedings (Cat. No.00CH37026) Pub Date : 2000-05-15 DOI: 10.1109/VETECS.2000.851703
J. Lassing, A. Persson, T. Ottosson, E. Strom, A. Svensson
{"title":"Combined coding and spreading in downlink CDMA systems","authors":"J. Lassing, A. Persson, T. Ottosson, E. Strom, A. Svensson","doi":"10.1109/VETECS.2000.851703","DOIUrl":"https://doi.org/10.1109/VETECS.2000.851703","url":null,"abstract":"Changing from orthogonal spreading codes in a direct-sequence CDMA (DS-CDMA) system to more powerful forward error correcting convolutional codes is proven superior in an asynchronous uplink system. This approach is referred to as code-spread CDMA (CS-CDMA). In this paper these two systems are compared in a synchronous downlink scenario. Both systems are assumed to operate over channels with nonzero delay spread, making it difficult to maintain orthogonality between users at the receiver. Using synchronous transmission, the DS-CDMA system is found to outperform the CS-CDMA system at high loads on all simulated channels. However, it is found that if the CS-CDMA system is allowed to transmit different users asynchronously through independent fading channels, like in an uplink scenario, it outperforms the synchronous downlink DS-CDMA system already on channels with modest delay spread.","PeriodicalId":318880,"journal":{"name":"VTC2000-Spring. 2000 IEEE 51st Vehicular Technology Conference Proceedings (Cat. No.00CH37026)","volume":"49 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126896932","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
The impact of cell search on system performance in WCDMA WCDMA中小区搜索对系统性能的影响
VTC2000-Spring. 2000 IEEE 51st Vehicular Technology Conference Proceedings (Cat. No.00CH37026) Pub Date : 2000-05-15 DOI: 10.1109/VETECS.2000.851361
Wang Hai, Chen Zhiqiang, M. Sundelin
{"title":"The impact of cell search on system performance in WCDMA","authors":"Wang Hai, Chen Zhiqiang, M. Sundelin","doi":"10.1109/VETECS.2000.851361","DOIUrl":"https://doi.org/10.1109/VETECS.2000.851361","url":null,"abstract":"This study evaluates the impact of the SCH/PCCPCH power allocation on cell search performance in WCDMA by means of system level simulation. The results indicate that we can obtain a near-optimal cell search performance by allocating a rather small amount of the base station output power to the SCH (Synchronisation CHannel) and PCCPCH (Primary Common Control Physical CHannel) channels.","PeriodicalId":318880,"journal":{"name":"VTC2000-Spring. 2000 IEEE 51st Vehicular Technology Conference Proceedings (Cat. No.00CH37026)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126071978","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
Performance and stability analysis of buffered R-ALOHA systems using tagged user approach (TUA) 使用标记用户方法(TUA)分析缓冲R-ALOHA系统的性能和稳定性
VTC2000-Spring. 2000 IEEE 51st Vehicular Technology Conference Proceedings (Cat. No.00CH37026) Pub Date : 2000-05-15 DOI: 10.1109/VETECS.2000.851357
Tao Wan, A. Sheikh, I. Lambadaris, M. Devetsikiotis
{"title":"Performance and stability analysis of buffered R-ALOHA systems using tagged user approach (TUA)","authors":"Tao Wan, A. Sheikh, I. Lambadaris, M. Devetsikiotis","doi":"10.1109/VETECS.2000.851357","DOIUrl":"https://doi.org/10.1109/VETECS.2000.851357","url":null,"abstract":"This paper uses the tagged user approach (TUA) to analyse R-ALOHA systems with propagation delay, finite buffer capacity and finite user population. The system stability, throughput, message delay and message blocking probability are studied. It is assumed that each message comprises a random number of packets that have a general distribution, and each user have a finite buffer capacity. To maintain the fairness to all users, it is assumed that each message in the buffer is transmitted independently, that is, a user has to release the reserved slot after finishing the transmission of the message even if it has other messages waiting in the buffer. It is straightforward to extend the analysis to R-ALOHA systems with infinite buffer capacity. The accuracy of the analysis is verified by simulation.","PeriodicalId":318880,"journal":{"name":"VTC2000-Spring. 2000 IEEE 51st Vehicular Technology Conference Proceedings (Cat. No.00CH37026)","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123818287","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
A commute advisory system 通勤咨询系统
VTC2000-Spring. 2000 IEEE 51st Vehicular Technology Conference Proceedings (Cat. No.00CH37026) Pub Date : 2000-05-15 DOI: 10.1109/VETECS.2000.851401
S. Kher, P. K. Chande
{"title":"A commute advisory system","authors":"S. Kher, P. K. Chande","doi":"10.1109/VETECS.2000.851401","DOIUrl":"https://doi.org/10.1109/VETECS.2000.851401","url":null,"abstract":"We have made an attempt to design and develop an expert system for providing advice before commencing a commute. Such a system is based on the concept of artificial intelligence and also makes use of a neural network based fault diagnostic unit while in motion. This will be helpful for commutes like ambulatory services, military movements, chartered tours, etc.","PeriodicalId":318880,"journal":{"name":"VTC2000-Spring. 2000 IEEE 51st Vehicular Technology Conference Proceedings (Cat. No.00CH37026)","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126433535","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
Power control and diversity effects on DS-CDMA mobile satellite systems over frequency selective channels: link and system level interface 频率选择信道上DS-CDMA移动卫星系统的功率控制和分集效应:链路和系统级接口
VTC2000-Spring. 2000 IEEE 51st Vehicular Technology Conference Proceedings (Cat. No.00CH37026) Pub Date : 2000-05-15 DOI: 10.1109/VETECS.2000.851583
M. Vázquez-Castro, J. Ramos, F. Pérez-Fontán
{"title":"Power control and diversity effects on DS-CDMA mobile satellite systems over frequency selective channels: link and system level interface","authors":"M. Vázquez-Castro, J. Ramos, F. Pérez-Fontán","doi":"10.1109/VETECS.2000.851583","DOIUrl":"https://doi.org/10.1109/VETECS.2000.851583","url":null,"abstract":"The radio resource management algorithms to be used in UMTS systems such as power control, frequency hopping and even time and spatial diversity cannot be independently considered in link and system level simulations. In this paper, a methodology to be followed when using time-series generated with a channel model is presented. Namely, a 3-state Markov model of the land mobile satellite channel is at large used to produce link level outputs for a full chip-rate DS-CDMA system, which are appropriate for system level simulations. Moreover, an insight on the practical advantages of using a semianalytical procedure for performance analysis (thoroughly validated by means of extensive Monte Carlo computer simulations) is presented.","PeriodicalId":318880,"journal":{"name":"VTC2000-Spring. 2000 IEEE 51st Vehicular Technology Conference Proceedings (Cat. No.00CH37026)","volume":"178 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121491172","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
A throughput-efficient code assignment scheme for an integrated voice/data multi-code CDMA system 一种用于话音/数据集成多码CDMA系统的吞吐量高效码分配方案
VTC2000-Spring. 2000 IEEE 51st Vehicular Technology Conference Proceedings (Cat. No.00CH37026) Pub Date : 2000-05-15 DOI: 10.1109/VETECS.2000.851375
Hyunduk Kang, Dongsoo Kim, Chiho Lee, Kiseon Kim
{"title":"A throughput-efficient code assignment scheme for an integrated voice/data multi-code CDMA system","authors":"Hyunduk Kang, Dongsoo Kim, Chiho Lee, Kiseon Kim","doi":"10.1109/VETECS.2000.851375","DOIUrl":"https://doi.org/10.1109/VETECS.2000.851375","url":null,"abstract":"In this paper, we propose an efficient code assignment scheme (CAS), namely, unfair-sharing scheme, to enhance the average throughput of non real-time data users in an integrated voice/data multi-code CDMA system. The unfair-sharing CAS allocates the maximum number of sub-codes only for one data user while assigning a single sub-code for the rest of the data users. To achieve a fair transmission for all data users, the number of sub-codes for each data user is scheduled by the round-robin method. It is shown that the proposed CAS is more efficient for non real-time data service than the conventional CAS, called a fair-sharing scheme, in terms of throughput, average power saving factor, and system utilization factor. Specifically, when a system is loaded by 20% of the maximum number of voice users and 30% of the maximum number of data users, the proposed CAS enhances the throughput approximately more than 200%.","PeriodicalId":318880,"journal":{"name":"VTC2000-Spring. 2000 IEEE 51st Vehicular Technology Conference Proceedings (Cat. No.00CH37026)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128744200","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
Two-step lattice super-exponential algorithm for blind equalization of multi-input multi-output channels 多输入多输出信道盲均衡的两步点阵超指数算法
VTC2000-Spring. 2000 IEEE 51st Vehicular Technology Conference Proceedings (Cat. No.00CH37026) Pub Date : 2000-05-15 DOI: 10.1109/VETECS.2000.851536
Chong-Yung Chi, Faa-Yeu Wang, Meng-Chian Chiang
{"title":"Two-step lattice super-exponential algorithm for blind equalization of multi-input multi-output channels","authors":"Chong-Yung Chi, Faa-Yeu Wang, Meng-Chian Chiang","doi":"10.1109/VETECS.2000.851536","DOIUrl":"https://doi.org/10.1109/VETECS.2000.851536","url":null,"abstract":"Feng and Chi (1998) reported a two-step lattice super-exponential algorithm (2S-LSEA) for blind equalization of single-input single-output (SISO) channels that is superior to Shalvi and Weinstein's (1993) FIR filter based super-exponential algorithm (SEA) in faster convergence speed, lower computational complexity, and more reliable performance to a variety of channels, besides modularity and low sensitivity to parameter quantization effects of lattice structure. In this paper, a 2S-LSEA for multi-input multi-output (MIMO) channels is proposed that is also superior to Yeung and Yau's (1998) SEA for MIMO channels in the same preceding advantages of the 2S-LSEA for SISO channels. Some simulation results are presented to support the efficacy of the proposed 2S-LSEA for MIMO channels.","PeriodicalId":318880,"journal":{"name":"VTC2000-Spring. 2000 IEEE 51st Vehicular Technology Conference Proceedings (Cat. No.00CH37026)","volume":"2007 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127303351","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
Coverage uncertainty and reliability estimation for microcellular radio network planning 微蜂窝无线网络规划的覆盖不确定性和可靠性估计
VTC2000-Spring. 2000 IEEE 51st Vehicular Technology Conference Proceedings (Cat. No.00CH37026) Pub Date : 2000-05-15 DOI: 10.1109/VETECS.2000.851501
V. Koshi
{"title":"Coverage uncertainty and reliability estimation for microcellular radio network planning","authors":"V. Koshi","doi":"10.1109/VETECS.2000.851501","DOIUrl":"https://doi.org/10.1109/VETECS.2000.851501","url":null,"abstract":"Analytical expressions are derived for estimation of the coverage probability and cell area reliability in Rice-log-normal fading conditions. The expressions include both short term and long term signal distributions in addition to the utilisation of the empirically determined area mean. The presented methodology could be used for optimal radio network planning, when different classes of the service quality are offered by the operator. The best server probability levels including statistical cell boundaries are calculated for microcells in rectilinear streets. The handover request probability is calculated for a particular network scenario. The cell radius as a statistical quantity is then modelled and the uncertainties in cell area estimation are calculated. The dependence of the coverage area reliability on the radio channel parameters is also quantified.","PeriodicalId":318880,"journal":{"name":"VTC2000-Spring. 2000 IEEE 51st Vehicular Technology Conference Proceedings (Cat. No.00CH37026)","volume":"96 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116952901","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
2-step multiplexing channel interleaver for W-CDMA mobile radio 用于W-CDMA移动无线电的2步多路信道交织器
VTC2000-Spring. 2000 IEEE 51st Vehicular Technology Conference Proceedings (Cat. No.00CH37026) Pub Date : 2000-05-15 DOI: 10.1109/VETECS.2000.851647
H. Ando, U. Okumura, T. Nakamura, S. Onoe
{"title":"2-step multiplexing channel interleaver for W-CDMA mobile radio","authors":"H. Ando, U. Okumura, T. Nakamura, S. Onoe","doi":"10.1109/VETECS.2000.851647","DOIUrl":"https://doi.org/10.1109/VETECS.2000.851647","url":null,"abstract":"The 3/sup rd/-generation mobile radio system will require high-quality data transmission and multimedia services. Channel coding and interleaving techniques are very important in achieving high-quality data transmission and multiplexing techniques are also important in realizing multimedia services. On the other hand, wideband CDMA (W-CDMA) is a promising radio access standard for the 3/sup rd/-generation mobile radio system. This paper proposes a new multiplexing channel interleaver structure that satisfies the above requirements for W-CDMA mobile radio systems and evaluates the performance of the proposed scheme by computer simulation. The simulation results show that the proposed scheme can provide sufficient interleaving gain while achieving a very efficient coding/multiplexing scheme while keeping the increase in hardware complexity to a minimum.","PeriodicalId":318880,"journal":{"name":"VTC2000-Spring. 2000 IEEE 51st Vehicular Technology Conference Proceedings (Cat. No.00CH37026)","volume":"107 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117022207","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
Common control channel provisioning for wireless packet data systems with compact frequency reuse and its impacts on EDGE system performance 频率复用无线分组数据系统的公共控制信道配置及其对EDGE系统性能的影响
VTC2000-Spring. 2000 IEEE 51st Vehicular Technology Conference Proceedings (Cat. No.00CH37026) Pub Date : 2000-05-15 DOI: 10.1109/VETECS.2000.851303
J. Chuang, S. Timiri, J. Whitehead
{"title":"Common control channel provisioning for wireless packet data systems with compact frequency reuse and its impacts on EDGE system performance","authors":"J. Chuang, S. Timiri, J. Whitehead","doi":"10.1109/VETECS.2000.851303","DOIUrl":"https://doi.org/10.1109/VETECS.2000.851303","url":null,"abstract":"This paper introduces the methods for providing reliable common control channels in packet data systems while utilizing a compact spectrum. The numerical examples were obtained from simulations of the EDGE (Enhanced Data-rates for GSM Evolution) system, a third generation TDMA based wireless packet system, initially targeted for applications such as Web browsing deployed over a wide-area cellular infrastructure. While compact frequency reuse results in better spectrum efficiency, the provisioning of common control functionality becomes challenging. We describe and evaluate a method based on time-synchronized base stations time-sharing control channels to achieve effectively 4/12 or 3/9 reuse. This system is capable of providing a stand-alone EDGE deployment using only three 200 kHz carriers. We present simulation results to understand the impacts on both control and traffic channels.","PeriodicalId":318880,"journal":{"name":"VTC2000-Spring. 2000 IEEE 51st Vehicular Technology Conference Proceedings (Cat. No.00CH37026)","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131181553","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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