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The 5th International Symposium on Wireless Personal Multimedia Communications最新文献

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Combined power control and successive interference cancellation in DS/CDMA communications DS/CDMA通信中的联合功率控制和连续干扰消除
The 5th International Symposium on Wireless Personal Multimedia Communications Pub Date : 2002-12-16 DOI: 10.1109/WPMC.2002.1088314
J. Kim, S. Kim
{"title":"Combined power control and successive interference cancellation in DS/CDMA communications","authors":"J. Kim, S. Kim","doi":"10.1109/WPMC.2002.1088314","DOIUrl":"https://doi.org/10.1109/WPMC.2002.1088314","url":null,"abstract":"It is well known that code division multiple access (CDMA) systems are interference-limited, and that the performance of CDMA systems depends on the success in managing the interference. Interference managements in terms of power control and interference cancellation have been investigated extensively in the past. We consider combining power control (PC) and successive interference cancellation (SIC), and show that the performance can be significantly improved by controlling the transmission power such that received power levels are geometrically distributed. We also show that the dynamic range of transmission power levels can be reduced by combining PC with SIC, thereby alleviating a stringent requirement on power amplifier and step size/frequency of power control commands.","PeriodicalId":420635,"journal":{"name":"The 5th International Symposium on Wireless Personal Multimedia Communications","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-12-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129290435","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
Call admission control in the uplink for WCDMA TDD systems WCDMA TDD系统上行链路中的呼叫允许控制
The 5th International Symposium on Wireless Personal Multimedia Communications Pub Date : 2002-12-16 DOI: 10.1109/WPMC.2002.1088248
Guodong Zhang
{"title":"Call admission control in the uplink for WCDMA TDD systems","authors":"Guodong Zhang","doi":"10.1109/WPMC.2002.1088248","DOIUrl":"https://doi.org/10.1109/WPMC.2002.1088248","url":null,"abstract":"A new call admission control algorithm in the uplink is proposed for 3G WCDMA TDD systems. The call admission control algorithm guarantees that the outage probability requirement can be met for the new users and existing users in the system. The algorithm allocates resource based on dynamic SIR requirement, and optimizes the outage probability for the assignment. Performance of the proposed algorithm and other algorithms in the technical literature are obtained in simulation and compared in different system scenarios.","PeriodicalId":420635,"journal":{"name":"The 5th International Symposium on Wireless Personal Multimedia Communications","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-12-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129475120","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
Effects of correlated shadowing and multipath fading on OFDM systems with postdetection-combining-based macrodiversity 相关阴影和多径衰落对基于检测后组合的OFDM系统宏分集的影响
The 5th International Symposium on Wireless Personal Multimedia Communications Pub Date : 2002-12-16 DOI: 10.1109/WPMC.2002.1088214
W. Hwang, Hongku Kang, Yeongyoon Choi, Kiseon Kim
{"title":"Effects of correlated shadowing and multipath fading on OFDM systems with postdetection-combining-based macrodiversity","authors":"W. Hwang, Hongku Kang, Yeongyoon Choi, Kiseon Kim","doi":"10.1109/WPMC.2002.1088214","DOIUrl":"https://doi.org/10.1109/WPMC.2002.1088214","url":null,"abstract":"The performance of orthogonal frequency division multiplexing (OFDM) using postdetection-combining-based macrodiversity is analyzed on a shadowed multipath channel, and the effects of correlated shadowing are investigated. We show that the postdetection-combining-based macrodiversity provides larger performance gain than the selection-based one, especially for the channel characterized by random multipath parameters. It is also shown that the gain obtained by using the postdetection-combining-based macrodiversity is reduced more and more as the correlation among the macrodiversity ports increases. Even for the fully correlated shadowing situation, however, the postdetection-combining-based macrodiversity still provides a considerable gain compared with no diversity case.","PeriodicalId":420635,"journal":{"name":"The 5th International Symposium on Wireless Personal Multimedia Communications","volume":"45 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-12-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129346107","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
Multimedia traffic control in integrated wired/wireless IP networks 有线/无线综合IP网络中的多媒体流量控制
The 5th International Symposium on Wireless Personal Multimedia Communications Pub Date : 2002-12-16 DOI: 10.1109/WPMC.2002.1088286
Kihong Park, A. Awan, Huan Ren
{"title":"Multimedia traffic control in integrated wired/wireless IP networks","authors":"Kihong Park, A. Awan, Huan Ren","doi":"10.1109/WPMC.2002.1088286","DOIUrl":"https://doi.org/10.1109/WPMC.2002.1088286","url":null,"abstract":"With the increasing deployment of wireless LANs that are connected to wired IP networks, it has become imperative to consider end-to-end QoS solutions that effectively function across their boundaries. This is even more pronounced for multimedia applications and QoS-sensitive transport of their traffic. They are enabled by the access bandwidth available with IEEE 802.11b and 802.11a WLANs. Scalable QoS control in wired networks is a challenging problem on its own; wireless access and mobility amplify the problem. Our current work advances an integrated solution for QoS support of mobile multimedia applications for wired/wireless networks. We build on our work in scalable QoS control for wired IP networks (see Chen, S. and Park, K., Proc. IEEE INFOCOM '99, p.864-72, 1999; Ren, H. and Park, K., Proc. IEEE/IFIP IWQoS, p.211-20, 2000), and extend it to encompass mobile wireless access via WLANs. The aim of this overview is to share our experience of building an integrated state-of-the-art wired/wireless IP network populated by QoS-enabled applications, which is based on the IP-centric scalable QoS architecture, Q-Bahn. The unexpected rise of WLANs is changing the networking landscape, perhaps a new beginning for wireless/mobile networking.","PeriodicalId":420635,"journal":{"name":"The 5th International Symposium on Wireless Personal Multimedia Communications","volume":"435 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-12-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123896253","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
Orthogonal pulse shapes design based on an efficient polytopic covering method 基于高效多面体覆盖法的正交脉冲形状设计
The 5th International Symposium on Wireless Personal Multimedia Communications Pub Date : 2002-12-16 DOI: 10.1109/WPMC.2002.1088385
L. Nam, T. T. Son, S. Mita
{"title":"Orthogonal pulse shapes design based on an efficient polytopic covering method","authors":"L. Nam, T. T. Son, S. Mita","doi":"10.1109/WPMC.2002.1088385","DOIUrl":"https://doi.org/10.1109/WPMC.2002.1088385","url":null,"abstract":"This paper presents an efficient method for designing orthogonal pulse shape for digital communication systems. A linear programming based method employing a tight polytopic approximation for the nonconvex parametric domain is used to solve an energy compaction filter problem. The method gives a global solution for the problem without additional variables, and hence can be used for designing long length filter applications. Simulation results are shown to illuminate the effectiveness of the approach.","PeriodicalId":420635,"journal":{"name":"The 5th International Symposium on Wireless Personal Multimedia Communications","volume":"38 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-12-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123382166","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
Constellation rearrangement and spreading code rearrangement for hybrid ARQ in MC-CDMA MC-CDMA混合ARQ的星座重排和扩频码重排
The 5th International Symposium on Wireless Personal Multimedia Communications Pub Date : 2002-12-16 DOI: 10.1109/WPMC.2002.1088258
K. Miyoshi, A. Matsumoto, C. Wengerter, M. Kasapidis, M. Uesugi, O. Kato
{"title":"Constellation rearrangement and spreading code rearrangement for hybrid ARQ in MC-CDMA","authors":"K. Miyoshi, A. Matsumoto, C. Wengerter, M. Kasapidis, M. Uesugi, O. Kato","doi":"10.1109/WPMC.2002.1088258","DOIUrl":"https://doi.org/10.1109/WPMC.2002.1088258","url":null,"abstract":"This paper presents two techniques that rearrange the data between retransmissions and can enhance the diversity gain from hybrid ARQ (hybrid automatic repeat request). One is constellation rearrangement that rearranges the signal constellation of QAM signals between retransmissions. The other is spreading code rearrangement that changes the spreading code with which the same symbol is transmitted in each retransmission. Simulation results show that those proposed schemes outperform type-H hybrid ARQ with packet combining, or chase combining.","PeriodicalId":420635,"journal":{"name":"The 5th International Symposium on Wireless Personal Multimedia Communications","volume":"179 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-12-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121258594","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: 22
Space-time soft receiver for coded DS-CDMA in time-selective Gaussian and non-Gaussian channels 时选高斯和非高斯信道编码DS-CDMA的空时软接收机
The 5th International Symposium on Wireless Personal Multimedia Communications Pub Date : 2002-12-16 DOI: 10.1109/WPMC.2002.1088378
Zi-Wei Zheng, Yi-Sheng Zhu
{"title":"Space-time soft receiver for coded DS-CDMA in time-selective Gaussian and non-Gaussian channels","authors":"Zi-Wei Zheng, Yi-Sheng Zhu","doi":"10.1109/WPMC.2002.1088378","DOIUrl":"https://doi.org/10.1109/WPMC.2002.1088378","url":null,"abstract":"In this paper, a space-time soft receiver is developed for convolutionally coded DS-CDMA systems with time-selective fading in both Gaussian and nonGaussian channels. The whole interference, including intersymbol interference (ISI), multiple access interference (MAI), and narrowband interference (NBI), is considered. Low-complexity continuously iterative nonlinear space-time soft interference cancellation and decoding techniques are proposed. The estimation of the parameters of the probability density function (PDF) of the whole interference and noise per propagation path per antenna element is directly computed by using the outputs of a chip-matched filter. The optimal combining weight is used to combine all the soft receiving signals to make the final statistic decision. Simulation results demonstrate that the proposed receiver structure offers significant performance gain over some existing approaches in both Gaussian and nonGaussian time-selective fading channels.","PeriodicalId":420635,"journal":{"name":"The 5th International Symposium on Wireless Personal Multimedia Communications","volume":"53 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-12-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124083094","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
A feedback rate control of video stream in best-effort high-speed mobile packet network 尽力而为高速移动分组网络中视频流的反馈速率控制
The 5th International Symposium on Wireless Personal Multimedia Communications Pub Date : 2002-12-16 DOI: 10.1109/WPMC.2002.1088288
D. Morikawa, S. Ota, A. Yamaguchi, M. Ohashi
{"title":"A feedback rate control of video stream in best-effort high-speed mobile packet network","authors":"D. Morikawa, S. Ota, A. Yamaguchi, M. Ohashi","doi":"10.1109/WPMC.2002.1088288","DOIUrl":"https://doi.org/10.1109/WPMC.2002.1088288","url":null,"abstract":"Video stream services have recently been deployed in mobile packet networks. It is important to mitigate the deterioration of quality in video playback due to dynamic changes in wireless bandwidth and delay. The paper proposes a rate control mechanism for a UDP based video stream service in a best-effort high-speed mobile packet network. The proposed mechanism is evaluated in a network simulator composed of a best-effort mobile packet network based on cdma2000 1x EV-DO (see 3GPP2 home page, http://www.3gpp2.org/) and the proposed video stream rate control mechanism. Traffic volume is verified as being adaptively controlled to avoid network congestion; the parameter setting in the proposed control mechanism is presented.","PeriodicalId":420635,"journal":{"name":"The 5th International Symposium on Wireless Personal Multimedia Communications","volume":"48 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-12-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126400133","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: 6
Managing the information flow in visual sensor networks 视觉传感器网络中的信息流管理
The 5th International Symposium on Wireless Personal Multimedia Communications Pub Date : 2002-12-16 DOI: 10.1109/WPMC.2002.1088364
K. Obraczka, R. Manduchi, J. J. Garcia-Luna-Aveces
{"title":"Managing the information flow in visual sensor networks","authors":"K. Obraczka, R. Manduchi, J. J. Garcia-Luna-Aveces","doi":"10.1109/WPMC.2002.1088364","DOIUrl":"https://doi.org/10.1109/WPMC.2002.1088364","url":null,"abstract":"Sensor networks, or sensor webs, which consist of a large number of interconnected sensing devices, have recently been the subject of extensive research. Typical applications of sensor networks include monitoring of possibly very large, remote and/or inaccessible areas, surveillance, and smart environments, like meeting rooms, buildings, homes, and highways. Our focus is on visual sensor networks, which are networks of cameras equipped with enough processing power to support local image analysis. The paper describes ongoing research at UCSC in visual sensor networks and highlights the research challenges to be addressed. It motivates the need for tight coupling between vision techniques and communication protocols for more effective monitoring/tracking capabilities (by having sensors operate in a coordinated manner), as well as energy- and bandwidth-efficient protocols which prolong the operational life of the sensor network.","PeriodicalId":420635,"journal":{"name":"The 5th International Symposium on Wireless Personal Multimedia Communications","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-12-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128077588","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: 78
An improved channel quality estimation technique for OFDM system 一种改进的OFDM系统信道质量估计技术
The 5th International Symposium on Wireless Personal Multimedia Communications Pub Date : 2002-12-16 DOI: 10.1109/WPMC.2002.1088387
Woo-Seok Yang, Kwonhue Choi, S. K. Shin
{"title":"An improved channel quality estimation technique for OFDM system","authors":"Woo-Seok Yang, Kwonhue Choi, S. K. Shin","doi":"10.1109/WPMC.2002.1088387","DOIUrl":"https://doi.org/10.1109/WPMC.2002.1088387","url":null,"abstract":"Adaptive transmission to the channel conditions has been shown to considerably improve the BER performance as well as transmission throughput. Application of the adaptive transmission technique to the OFDM system has been considered in many areas in order to utilize the advantage of the adaptive schemes. However, accurate estimation of channel conditions, especially signal to interference ratio (SIR) must be advanced for efficient adaptive schemes. In this paper, we propose a channel quality estimation technique for adaptive OFDM systems which suffer from interference due to channel estimation error and thermal noise. The proposed scheme estimates the variance of thermal noise by using the null space of the channel gain matrix in an OFDM symbol first, then evaluates the total interference power from the estimated thermal noise variance. Simulation results show that the proposed estimation algorithm produces more than an order of better estimates than the conventional algorithm even with fewer of pilots.","PeriodicalId":420635,"journal":{"name":"The 5th International Symposium on Wireless Personal Multimedia Communications","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-12-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130266865","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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