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12th IEEE International Symposium on Personal, Indoor and Mobile Radio Communications. PIMRC 2001. Proceedings (Cat. No.01TH8598)最新文献

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A novel blind adaptive algorithm for channel equalization in WCDMA downlink 一种新的WCDMA下行信道盲自适应均衡算法
12th IEEE International Symposium on Personal, Indoor and Mobile Radio Communications. PIMRC 2001. Proceedings (Cat. No.01TH8598) Pub Date : 2001-09-30 DOI: 10.1109/PIMRC.2001.965388
M. Heikkila
{"title":"A novel blind adaptive algorithm for channel equalization in WCDMA downlink","authors":"M. Heikkila","doi":"10.1109/PIMRC.2001.965388","DOIUrl":"https://doi.org/10.1109/PIMRC.2001.965388","url":null,"abstract":"In the downlink of the wideband code division multiple-access (WCDMA) system users are separated by the means of orthogonal variable spreading factor (OVSF) codes. The orthogonality of the users is lost in multipath channels causing multiple access interference in the system. To suppress the interference in the downlink, it has been proposed to utilize linear channel equalization to partially restore the orthogonality of the users' spreading codes. The well-known LMMSE equalizer, however, may be computationally too involved for practical applications. This is why adaptive solutions am preferred. In this paper, a novel adaptive approach for linear estimation and equalization is presented. Contrary to many other techniques, the applied blind adaptive algorithm can be used without changes also in multi antenna transmission systems, such as space-time coded transmission, and with long scrambling codes. The performance of the new adaptive LMMSE receiver is evaluated in a complete UTRA FDD downlink simulator and is compared to conventional RAKE receiver.","PeriodicalId":318292,"journal":{"name":"12th IEEE International Symposium on Personal, Indoor and Mobile Radio Communications. PIMRC 2001. Proceedings (Cat. No.01TH8598)","volume":"140 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123376910","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: 7
Downlink channel estimation for IMT-DS IMT-DS的下行信道估计
12th IEEE International Symposium on Personal, Indoor and Mobile Radio Communications. PIMRC 2001. Proceedings (Cat. No.01TH8598) Pub Date : 2001-09-30 DOI: 10.1109/PIMRC.2001.965277
S. Shah, A. Sheikh
{"title":"Downlink channel estimation for IMT-DS","authors":"S. Shah, A. Sheikh","doi":"10.1109/PIMRC.2001.965277","DOIUrl":"https://doi.org/10.1109/PIMRC.2001.965277","url":null,"abstract":"IMT-DS system is an approved terrestrial radio interface standard for 3G mobile communication based on direct sequence code division multiple access (DS-CDMA). It employs a RAKE receiver to exploit multipath diversity. This paper discusses a new dimension in DS-CDMA channel estimation i.e., chip-level adaptive channel estimation. The DL channel of an IMT-DS system consists of time-multiplexed pilot and data symbols to facilitate coherent detection. To obtain channel estimates during pilot symbols, we propose a chip level adaptive channel estimation which performs better than the conventional method. For slow fading channels, like a pedestrian channel, zero order interpolation provides satisfactory performance. However, for fast fading channels, a common decision directed algorithm is applied whose performance is limited due to error propagation. The proposed schemes are assessed over the IMT-DS system by performing simulations.","PeriodicalId":318292,"journal":{"name":"12th IEEE International Symposium on Personal, Indoor and Mobile Radio Communications. PIMRC 2001. Proceedings (Cat. No.01TH8598)","volume":"94 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121253274","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
Revealing TCP unfairness behavior in 802.11 based wireless multi-hop networks 揭示基于802.11的无线多跳网络中的TCP不公平行为
12th IEEE International Symposium on Personal, Indoor and Mobile Radio Communications. PIMRC 2001. Proceedings (Cat. No.01TH8598) Pub Date : 2001-09-30 DOI: 10.1109/PIMRC.2001.965267
Shugong Xu, T. Saadawi
{"title":"Revealing TCP unfairness behavior in 802.11 based wireless multi-hop networks","authors":"Shugong Xu, T. Saadawi","doi":"10.1109/PIMRC.2001.965267","DOIUrl":"https://doi.org/10.1109/PIMRC.2001.965267","url":null,"abstract":"In this paper, we report and reveal an unfairness problem among TCP connections in an IEEE 802.11-based wireless multi-hop network. This problem is not the same as those unfairness problems reported before. In each of the cases we identified, the one TCP connection is completely shut down, even if it starts much earlier than the competing TCP traffic. By illustrating the TCP layer and MAC layer traces, we show that this kind of unfairness problem is rooted in the IEEE 802.11 MAC layer. The hidden node problem and the exposed node problem along with the exponential back-off scheme in the MAC layer are the major causes for that problem.","PeriodicalId":318292,"journal":{"name":"12th IEEE International Symposium on Personal, Indoor and Mobile Radio Communications. PIMRC 2001. Proceedings (Cat. No.01TH8598)","volume":"200 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114230071","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
Forward link capacity losses for soft and softer handoff in cellular systems 蜂窝系统中软切换和软切换的前向链路容量损失
12th IEEE International Symposium on Personal, Indoor and Mobile Radio Communications. PIMRC 2001. Proceedings (Cat. No.01TH8598) Pub Date : 2001-09-30 DOI: 10.1109/PIMRC.2001.965490
C. Uc-Rios, D. Lara-Rodríguez
{"title":"Forward link capacity losses for soft and softer handoff in cellular systems","authors":"C. Uc-Rios, D. Lara-Rodríguez","doi":"10.1109/PIMRC.2001.965490","DOIUrl":"https://doi.org/10.1109/PIMRC.2001.965490","url":null,"abstract":"In CDMA cellular systems, all radio channels use the same frequency band, and the same radio channel can be reused in all neighboring cells. On the forward link there are at least two base stations involved in the soft handoff process, where each base station supports a forward link channel to the mobile, this produce capacity gain by macrodiversity and produce capacity loss due to the use of extra channels. In this paper the losses of soft and softer handoff on the forward-link capacity for unsectorized and sectorized cells due to the use of at least two BSs in the handoff process are evaluated analytically. We follow two approaches, the deterministic approach and the random approach (considering shadowing) and we take into account the IS-95 standard. We obtain that the capacity loss is approximately from 13% to 25% depending of propagation parameters values and handoff threshold.","PeriodicalId":318292,"journal":{"name":"12th IEEE International Symposium on Personal, Indoor and Mobile Radio Communications. PIMRC 2001. Proceedings (Cat. No.01TH8598)","volume":"293 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116211753","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
Fast power control for voice in GERAN GERAN语音快速电源控制
12th IEEE International Symposium on Personal, Indoor and Mobile Radio Communications. PIMRC 2001. Proceedings (Cat. No.01TH8598) Pub Date : 2001-09-30 DOI: 10.1109/PIMRC.2001.965476
C. Tidestav, M. Eriksson
{"title":"Fast power control for voice in GERAN","authors":"C. Tidestav, M. Eriksson","doi":"10.1109/PIMRC.2001.965476","DOIUrl":"https://doi.org/10.1109/PIMRC.2001.965476","url":null,"abstract":"The capacity of a GSM system can be increased with fast power control. By sending four consecutive power control commands/measurement reports-instead of one-in the four bursts reserved for the slow associated control channel (SACCH), the system capacity can be increased by 10% for slow mobiles, and by 40% for fast mobiles. This gain is obtained with relatively small changes in the standard. The power control signaling is robust enough to handle low C/I situations. By simultaneously modifying its channel coding, the performance of the SACCH can be improved. This scheme will be part of Release 5 of the GSM/EDGE radio access network standard and is called enhanced power control.","PeriodicalId":318292,"journal":{"name":"12th IEEE International Symposium on Personal, Indoor and Mobile Radio Communications. PIMRC 2001. Proceedings (Cat. No.01TH8598)","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121564199","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 random walk mobility model for location management in wireless networks 一种用于无线网络位置管理的随机行走移动模型
12th IEEE International Symposium on Personal, Indoor and Mobile Radio Communications. PIMRC 2001. Proceedings (Cat. No.01TH8598) Pub Date : 2001-09-30 DOI: 10.1109/PIMRC.2001.965260
Kuo-Hsing Chiang, N. Shenoy
{"title":"A random walk mobility model for location management in wireless networks","authors":"Kuo-Hsing Chiang, N. Shenoy","doi":"10.1109/PIMRC.2001.965260","DOIUrl":"https://doi.org/10.1109/PIMRC.2001.965260","url":null,"abstract":"This paper describes a new and simple random walk mobility model that simplifies the two-dimensional Markov chain based on the properties of symmetry and lumped process. Compared to various other approaches, the proposed approach significantly reduces the complexity of the model by reducing the computing states. Based on this model, the location update rate and dwell time can be easily derived. The regular Markov chain and the property of combining states are applied to derive the number of location updates and a modified absorbing Markov chain property can be used to derive the dwell time. Analytical performance results of the model were validated by simulation. Results show the relative error between analytical and simulation performances are within 1%. This is the first model of its kind that can be used for studying area-crossing rates. This model can be adapted to most mobility management studies for architectures.","PeriodicalId":318292,"journal":{"name":"12th IEEE International Symposium on Personal, Indoor and Mobile Radio Communications. PIMRC 2001. Proceedings (Cat. No.01TH8598)","volume":"86 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124153190","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: 37
Cable-less measurement set-up for wireless handheld terminals 无线手持终端的无电缆测量装置
12th IEEE International Symposium on Personal, Indoor and Mobile Radio Communications. PIMRC 2001. Proceedings (Cat. No.01TH8598) Pub Date : 2001-09-30 DOI: 10.1109/PIMRC.2001.965442
W. Kotterman, G. F. Pedersen, K. Olesen, P. Eggers
{"title":"Cable-less measurement set-up for wireless handheld terminals","authors":"W. Kotterman, G. F. Pedersen, K. Olesen, P. Eggers","doi":"10.1109/PIMRC.2001.965442","DOIUrl":"https://doi.org/10.1109/PIMRC.2001.965442","url":null,"abstract":"Attaching cables to mobile terminals for accurate measurements is progressively influencing the radiation characteristics with the diminishing size of the terminals. Simulations show the large influence of cables and their exact curvature on the radiation properties of mobile terminals that are small with respect to the wavelength. These results are confirmed by measurements in an anechoic chamber. As corrections for these almost irreproducible influences are hardly feasible, we propose to omit conducting cables completely. Instead, optical fibres are used for transparent transport of the RF signals. Off-the-shelf system components allow for two channels in a box of size comparable to modern small terminals. When driven at an appropriate level this set-up shows ample dynamic range for mobile radio channel sounding.","PeriodicalId":318292,"journal":{"name":"12th IEEE International Symposium on Personal, Indoor and Mobile Radio Communications. PIMRC 2001. Proceedings (Cat. No.01TH8598)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125840781","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: 66
A media synchronization experiment on continuous media transmission in Bluetooth LAN access 蓝牙局域网接入中连续媒体传输的媒体同步实验
12th IEEE International Symposium on Personal, Indoor and Mobile Radio Communications. PIMRC 2001. Proceedings (Cat. No.01TH8598) Pub Date : 2001-09-30 DOI: 10.1109/PIMRC.2001.965493
H. Okura, Hirotsugu Kato, S. Tasaka
{"title":"A media synchronization experiment on continuous media transmission in Bluetooth LAN access","authors":"H. Okura, Hirotsugu Kato, S. Tasaka","doi":"10.1109/PIMRC.2001.965493","DOIUrl":"https://doi.org/10.1109/PIMRC.2001.965493","url":null,"abstract":"This paper assesses the media synchronization quality in a Bluetooth LAN access system by experiment. We consider a situation where a server transfers stored video and audio streams to a terminal with point-to-point communication. Both FEC and ARQ are adopted as error control schemes. The slide control scheme is used for media synchronization control. We examine how the interference from DSSS systems affects the quality. For simplicity of experiment, we suppose that the Bluetooth terminal does not move while the media streams are transferred, i.e., fading does not occur. In the experiment, we evaluated several performance measures such as mean square error of intra-stream synchronization. We then found that delay jitters caused by retransmission of DM1 packets disturbed temporal relations of the streams. We also observed that the media synchronization control is effective in compensating for the disturbance.","PeriodicalId":318292,"journal":{"name":"12th IEEE International Symposium on Personal, Indoor and Mobile Radio Communications. PIMRC 2001. Proceedings (Cat. No.01TH8598)","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127913377","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: 9
Time-frequency decision-driven multiuser detectors over fast-fading multipath channels for synchronous DS-CDMA systems 同步DS-CDMA系统快衰落多径信道时频决策驱动多用户检测器
12th IEEE International Symposium on Personal, Indoor and Mobile Radio Communications. PIMRC 2001. Proceedings (Cat. No.01TH8598) Pub Date : 2001-09-30 DOI: 10.1109/PIMRC.2001.965453
Ö. Ertug, B. Baykal, B. Unal
{"title":"Time-frequency decision-driven multiuser detectors over fast-fading multipath channels for synchronous DS-CDMA systems","authors":"Ö. Ertug, B. Baykal, B. Unal","doi":"10.1109/PIMRC.2001.965453","DOIUrl":"https://doi.org/10.1109/PIMRC.2001.965453","url":null,"abstract":"RAKE receivers suffer degradation in performance under fast fading due to errors in channel state estimation. The wide-sense stationary uncorrelated scatterer channel model tends itself to time-frequency canonical representation, and provides additional diversity in the frequency axis. That is, the joint multipath-Doppler diversity model enables the development of nonlinear decision-driven time-frequency multiuser detectors based on successive interference cancellation and multistage interference cancellation ideas. Simulation results demonstrate that the proposed nonlinear decision-driven time-frequency multiuser detectors promise substantially improved bit-error-rate performance compared to previously proposed time-frequency multiuser detectors while exhibiting strong resistance to the near-far effect.","PeriodicalId":318292,"journal":{"name":"12th IEEE International Symposium on Personal, Indoor and Mobile Radio Communications. PIMRC 2001. Proceedings (Cat. No.01TH8598)","volume":"58 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134376759","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
System level performance evaluation of EDGE Compact EDGE紧凑型的系统级性能评估
12th IEEE International Symposium on Personal, Indoor and Mobile Radio Communications. PIMRC 2001. Proceedings (Cat. No.01TH8598) Pub Date : 2001-09-30 DOI: 10.1109/PIMRC.2001.965306
D. Molkdar, W. Featherstone
{"title":"System level performance evaluation of EDGE Compact","authors":"D. Molkdar, W. Featherstone","doi":"10.1109/PIMRC.2001.965306","DOIUrl":"https://doi.org/10.1109/PIMRC.2001.965306","url":null,"abstract":"EDGE Compact has been developed to enable the deployment of an EGPRS system by utilising only 0.6 MHz worth of spectrum. The implication of using such a narrow spectrum is that system loading becomes a critical factor in maintaining an acceptable QoS service from the user's perspective. This paper investigates - under a simulation environment - the performance of 1:3, 2:6, 3:9 and 4:12 EDGE Compact. The scenarios are analysed by varying system loading and considering system throughput and user delay statistics with and without admission control. The results are particular to the population of mobiles operating with perfect receiver, under TU50-NoFH radio condition, E-mail traffic and perfect link adaptation.","PeriodicalId":318292,"journal":{"name":"12th IEEE International Symposium on Personal, Indoor and Mobile Radio Communications. PIMRC 2001. Proceedings (Cat. No.01TH8598)","volume":"101 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131562322","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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