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Capacity of multi-antenna systems with adaptive transmission techniques 采用自适应传输技术的多天线系统容量
The 5th International Symposium on Wireless Personal Multimedia Communications Pub Date : 2002-12-16 DOI: 10.1109/WPMC.2002.1088200
S. Jayaweera, H. Poor
{"title":"Capacity of multi-antenna systems with adaptive transmission techniques","authors":"S. Jayaweera, H. Poor","doi":"10.1109/WPMC.2002.1088200","DOIUrl":"https://doi.org/10.1109/WPMC.2002.1088200","url":null,"abstract":"The capacity of multiple antenna systems in the presence of Rayleigh flat fading is considered under the assumption that channel state information (CSI) is available at both transmitter and receiver. The capacity expression for a general dual antenna array system of multiple transmitter and receiver antennas is derived together with an equation that determines the cut-off value for such a system. It is shown that, compared to the case in which there is only receiver CSI, large capacity gains are available with an optimal power and rate adaptation scheme.","PeriodicalId":420635,"journal":{"name":"The 5th International Symposium on Wireless Personal Multimedia Communications","volume":"28 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":"121397862","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
Window adaptive TCP for EGPRS networks EGPRS网络的窗口自适应TCP
The 5th International Symposium on Wireless Personal Multimedia Communications Pub Date : 2002-12-16 DOI: 10.1109/WPMC.2002.1088298
D. Lee, Chia-Chun Lin
{"title":"Window adaptive TCP for EGPRS networks","authors":"D. Lee, Chia-Chun Lin","doi":"10.1109/WPMC.2002.1088298","DOIUrl":"https://doi.org/10.1109/WPMC.2002.1088298","url":null,"abstract":"TCP congestion control has been widely discussed on various networks under wireline or wireless environment. Many research studies have been raised to help TCP be more sensitive to the network congestion by adding explicit notifications in TCP connection or letting the intermediate nodes in the network to join TCP congestion control. In GPRS/EGPRS systems and other 3G cellular networks, the radio network controller chooses among several channel coders according to the signal to interference ratio. Hence, the channel data rate that an individual user experiences is time-dependent and variable. We propose a TCP window control mechanism that adapts to the variable channel data rates. Our simulations show that the window adaptive TCP decreases the buffer occupancy and packet transmission delay, and achieves better throughput utilization when compared with the standard TCP Tahoe version and the Reno version.","PeriodicalId":420635,"journal":{"name":"The 5th International Symposium on Wireless Personal Multimedia Communications","volume":"11 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":"126568635","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
Performance limits of multicarrier based systems in fading channels with optimal detection 基于多载波的系统在最优检测衰落信道中的性能限制
The 5th International Symposium on Wireless Personal Multimedia Communications Pub Date : 2002-12-16 DOI: 10.1109/WPMC.2002.1088329
Andrea M. Tonello
{"title":"Performance limits of multicarrier based systems in fading channels with optimal detection","authors":"Andrea M. Tonello","doi":"10.1109/WPMC.2002.1088329","DOIUrl":"https://doi.org/10.1109/WPMC.2002.1088329","url":null,"abstract":"We investigate the best attainable performance (performance limits) of multicarrier modulated signals in time-variant frequency selective fading channels when optimal maximum likelihood detection is deployed. It is found that filtered multicarrier modulation is a diversity transform that is capable of yielding coding gains and time/frequency diversity gains as a function of the sub-carrier spacing, and the sub-channel filter shape.","PeriodicalId":420635,"journal":{"name":"The 5th International Symposium on Wireless Personal Multimedia Communications","volume":"32 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":"126035400","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
Downlink throughput analysis in a WCDMA network with mixed QoS traffic classes 混合QoS流量分类下WCDMA网络的下行吞吐量分析
The 5th International Symposium on Wireless Personal Multimedia Communications Pub Date : 2002-12-16 DOI: 10.1109/WPMC.2002.1088137
C. Dou, Yu-Hua Chang, Shenghui Yan
{"title":"Downlink throughput analysis in a WCDMA network with mixed QoS traffic classes","authors":"C. Dou, Yu-Hua Chang, Shenghui Yan","doi":"10.1109/WPMC.2002.1088137","DOIUrl":"https://doi.org/10.1109/WPMC.2002.1088137","url":null,"abstract":"In UMTS, four traffic classes have been identified: conversational, streaming, interactive, and background, to fulfill the QoS requests from the application or the user. To effectively manage the radio resources, shared between these different QoS classes has become an important network planning issue. In this paper, the maximum available resource, R/sub max/, of a cell (per sector per carrier) is defined in terms of the maximum downlink transmission power, the average propagation loss, the orthogonality factor, and the other-to-own-cell interference ratio. The resource sharing factor of each traffic class can be calculated by dividing the total resource allocated for that class by the maximum available resource, R/sub max/. The summation of the resource sharing factors of all traffic classes is smaller than one. This paper also shows that the average throughput of the downlink is a weighted sum of the resource sharing factors. Downlink throughput calculations for various traffic conditions with mixed QoS classes are presented by using the derived weighted sum equation.","PeriodicalId":420635,"journal":{"name":"The 5th International Symposium on Wireless Personal Multimedia Communications","volume":"150 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":"116093531","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
Design of APAA with 4 channel digital beamformer for HAPS 带4通道数字波束形成器的HAPS APAA设计
The 5th International Symposium on Wireless Personal Multimedia Communications Pub Date : 2002-12-16 DOI: 10.1109/WPMC.2002.1088207
B. Ku, Jong-Min Park, Yang-Su Kim, Do-Seob Ahn
{"title":"Design of APAA with 4 channel digital beamformer for HAPS","authors":"B. Ku, Jong-Min Park, Yang-Su Kim, Do-Seob Ahn","doi":"10.1109/WPMC.2002.1088207","DOIUrl":"https://doi.org/10.1109/WPMC.2002.1088207","url":null,"abstract":"This paper presents the design of the experimental model with 4 channel receivers and four linear array cross dipole antennas. A cross dipole microstrip antenna type, which has a simple radiating element to manufacture easily and a feeding structure of a quadrature hybrid to achieve circular polarization, is considered. The model considered is a simplified prototype of more complicated multielement APAA which should be developed for a stratospheric communication system.","PeriodicalId":420635,"journal":{"name":"The 5th International Symposium on Wireless Personal Multimedia Communications","volume":"41 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":"123878403","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 utility of hello messages for determining link connectivity 用于确定链路连通性的hello消息的实用程序
The 5th International Symposium on Wireless Personal Multimedia Communications Pub Date : 2002-12-16 DOI: 10.1109/WPMC.2002.1088225
I. Chakeres, E. Belding-Royer
{"title":"The utility of hello messages for determining link connectivity","authors":"I. Chakeres, E. Belding-Royer","doi":"10.1109/WPMC.2002.1088225","DOIUrl":"https://doi.org/10.1109/WPMC.2002.1088225","url":null,"abstract":"Future wireless applications will take advantage of rapidly deployable, self-configuring multihop ad hoc networks. Because of the difficulty of obtaining IEEE 802.11 feedback about link connectivity in real networks, many multihop ad hoc networks utilize hello messages to determine local connectivity. The paper uses an implementation of the ad hoc on-demand distance vector (AODV) routing protocol to examine the effectiveness of hello messages for monitoring link status. Our study determines that many factors influence the utility of hello messages, including allowed hello message loss settings, discrepancy between data and hello message size and 802.11b packet handling. The paper examines these factors and experimentally evaluates a variety of approaches for improving the accuracy of hello messages as an indicator of local connectivity.","PeriodicalId":420635,"journal":{"name":"The 5th International Symposium on Wireless Personal Multimedia Communications","volume":"9 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":"125596246","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: 209
The performance of macrodiversity in the downlink of WCDMA with radio over fibre access network 无线光纤接入网WCDMA下行链路宏分集性能研究
The 5th International Symposium on Wireless Personal Multimedia Communications Pub Date : 2002-12-16 DOI: 10.1109/WPMC.2002.1088194
N. Khashjori, H. Al-Raweshidy, A. Bajwa
{"title":"The performance of macrodiversity in the downlink of WCDMA with radio over fibre access network","authors":"N. Khashjori, H. Al-Raweshidy, A. Bajwa","doi":"10.1109/WPMC.2002.1088194","DOIUrl":"https://doi.org/10.1109/WPMC.2002.1088194","url":null,"abstract":"The performance of a WCDMA radio over fibre access network in macrodiversity mode is investigated. We computed the E/sub b//N/sub 0/ for different cases applying the macrodiversity combining method. Our simulation results demonstrate that, for a given service, the capacity increased by 13%-46% (depending on the channel model and the mobile speed) in the case of the macrodiversity link as compared to the single link.","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":"122443426","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
Two dimensional spreading codes for the downlink in a multiuser system with multiple antennas 多天线多用户系统下行链路的二维扩频码
The 5th International Symposium on Wireless Personal Multimedia Communications Pub Date : 2002-12-16 DOI: 10.1109/WPMC.2002.1088274
R. Doostnejad, Teng Joon Lim, E. Sousa
{"title":"Two dimensional spreading codes for the downlink in a multiuser system with multiple antennas","authors":"R. Doostnejad, Teng Joon Lim, E. Sousa","doi":"10.1109/WPMC.2002.1088274","DOIUrl":"https://doi.org/10.1109/WPMC.2002.1088274","url":null,"abstract":"We present a novel space-time spreading scheme for the down-link in a multiuser system. The primary goals of this work are to increase bandwidth efficiency, and to provide joint multiuser detection and space-time decoding, in each mobile station. Each receiver just needs to know its own spreading code and no information about the channel is required in the transmitter. In the proposed architecture, to achieve high bandwidth efficiency, the number of user-channels, is maximized by taking advantage of the large potential capacity of a multiple antenna system.","PeriodicalId":420635,"journal":{"name":"The 5th International Symposium on Wireless Personal Multimedia Communications","volume":"83 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":"122629791","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 three-phase ad hoc network formation protocol for Bluetooth systems 一个用于蓝牙系统的三相自组织网络形成协议
The 5th International Symposium on Wireless Personal Multimedia Communications Pub Date : 2002-12-16 DOI: 10.1109/WPMC.2002.1088163
Ji-Hun Yun, Jesung Kim, Yong-Suk Kim, J. Ma
{"title":"A three-phase ad hoc network formation protocol for Bluetooth systems","authors":"Ji-Hun Yun, Jesung Kim, Yong-Suk Kim, J. Ma","doi":"10.1109/WPMC.2002.1088163","DOIUrl":"https://doi.org/10.1109/WPMC.2002.1088163","url":null,"abstract":"Bluetooth is considered attractive as a means of building an instantaneous ad hoc network consisting of personal devices. However, Bluetooth-based ad hoc networking raises several issues due to the characteristics of the technology such as spread spectrum and the asymmetric communication model. In this paper, we propose a network formation model that considers the technical characteristics of Bluetooth. The proposed model identifies three essential phases that a Bluetooth system must implement to form an ad hoc network, namely, (1) neighbor discovery, (2) neighbor grouping, and (3) role assignment. Each of these phases introduces several design trade-offs, producing a design space that encompasses previously proposed designs as well as new designs. Based on this observation, we propose a new ad hoc network formation protocol called Bluestars. The proposed protocol has nice properties such as shorter average distance between nodes, higher reachability between nodes, and lower overheads associated with an addition of new nodes, yet it is simple enough to be implemented in a small system.","PeriodicalId":420635,"journal":{"name":"The 5th International Symposium on Wireless Personal Multimedia Communications","volume":"357 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":"122808364","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: 18
Effect of frame synchronization errors on pilot-aided channel estimation in OFDM: analysis and solution 帧同步误差对OFDM导频辅助信道估计的影响:分析与解决方法
The 5th International Symposium on Wireless Personal Multimedia Communications Pub Date : 2002-12-16 DOI: 10.1109/WPMC.2002.1088391
Y. Mostofi, D. Cox, A. Bahai
{"title":"Effect of frame synchronization errors on pilot-aided channel estimation in OFDM: analysis and solution","authors":"Y. Mostofi, D. Cox, A. Bahai","doi":"10.1109/WPMC.2002.1088391","DOIUrl":"https://doi.org/10.1109/WPMC.2002.1088391","url":null,"abstract":"Channel estimation in orthogonal frequency division multiplexing (OFDM) systems requires transmission of pilot tones, especially in a high delay spread environment. The number of pilot tones needed exceeds the maximum length of the channel delay (normalized to the symbol period) by one. The best estimate of the channel values in between pilots can be acquired by an IFFT, zero padding and an FFT. Such an estimator gives perfect estimate of the channel in the absence of noise and synchronization errors. However, in the presence of frame synchronization errors, its performance degrades, especially for timing offsets to the right. In this paper, we analyze the sensitivity of such channel estimator to frame synchronization errors, explaining how it is more affected by timing offsets to the right than those to the left. Then through utilizing this sensitivity, we propose a low complexity method to correct frame synchronization errors, which can improve the performance considerably without a need for added training overhead.","PeriodicalId":420635,"journal":{"name":"The 5th International Symposium on Wireless Personal Multimedia Communications","volume":"123 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":"122927145","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: 26
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