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IEEE Global Telecommunications Conference, 2004. GLOBECOM '04.最新文献

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Performance analysis of blind channel estimation without eigendecomposition 无特征分解盲信道估计的性能分析
IEEE Global Telecommunications Conference, 2004. GLOBECOM '04. Pub Date : 2004-11-29 DOI: 10.1109/GLOCOM.2004.1378428
Ö. Özdemir, M. Torlak
{"title":"Performance analysis of blind channel estimation without eigendecomposition","authors":"Ö. Özdemir, M. Torlak","doi":"10.1109/GLOCOM.2004.1378428","DOIUrl":"https://doi.org/10.1109/GLOCOM.2004.1378428","url":null,"abstract":"The analytical performance of the blind estimation of finite-impulse response (FIR) channels without eigendecomposition in CDMA systems is examined. The channel problem arises when CDMA signals are subject to frequency selective fading. Blind channel estimation is desired when training data is unavailable. Blind channel estimation techniques in the literature often rely on subspace decomposition of received signals. Blind channel estimation can also be coupled with a multiuser receiver design in the context of a minimum output energy (MOE) criterion. While subspace decomposition is avoided, the inverse of the data covariance matrix of the received signals is needed (Xu, Z. et al., Proc. IEEE Asilomar Conf. Signals, Syst. Comput., p.689-93, 2002). Previously (Ozdemir, O. and Torlak, M., Proc. IEEE Int. Conf. on Commun., vol.5, p.2621-5, 2004), we proposed a blind channel estimation method using simple covariance matrix transformations. We now use analytical and simulation results to show that the channel estimates converge to the eigendecomposition based channel estimates at medium to high signal-to-noise ratio (SNR).","PeriodicalId":162046,"journal":{"name":"IEEE Global Telecommunications Conference, 2004. GLOBECOM '04.","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-11-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126053702","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
TDM-based coordination function (TCF) in WLAN for high throughput 无线局域网中基于tdm的高吞吐量协调功能(TCF)
IEEE Global Telecommunications Conference, 2004. GLOBECOM '04. Pub Date : 2004-11-29 DOI: 10.1109/GLOCOM.2004.1378948
Chaegwon Lim, Chong-Ho Choi
{"title":"TDM-based coordination function (TCF) in WLAN for high throughput","authors":"Chaegwon Lim, Chong-Ho Choi","doi":"10.1109/GLOCOM.2004.1378948","DOIUrl":"https://doi.org/10.1109/GLOCOM.2004.1378948","url":null,"abstract":"IEEE 802.11 has become a dominant standard for wireless local area network (WLAN), and the users' demand for high throughput of IEEE 802.11 is continuously increasing. We propose a new medium access control scheme, TDM-based coordination function (TCF), which can be used when all the stations are within the radio transmission range. TCF uses information on the number of active stations explicitly to eliminate the contention period in the DCF (distributed coordination function) of IEEE 802.11. TCF can improve overall throughput and provide fair sharing of resources among active stations. Also, TCF is simple and can be implemented distributively. Simulation is performed to compare TCF with DCF and FCR (fast collision recovery) in terms of performance.","PeriodicalId":162046,"journal":{"name":"IEEE Global Telecommunications Conference, 2004. GLOBECOM '04.","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-11-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126055325","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: 30
A Markov decision-based bandwidth selling policy for an active MPLS service over ISDN3 基于马尔可夫决策的ISDN3主动MPLS业务带宽销售策略
IEEE Global Telecommunications Conference, 2004. GLOBECOM '04. Pub Date : 2004-11-29 DOI: 10.1109/GLOCOM.2004.1378237
W. T. Liu, Henry C. B. Chan
{"title":"A Markov decision-based bandwidth selling policy for an active MPLS service over ISDN3","authors":"W. T. Liu, Henry C. B. Chan","doi":"10.1109/GLOCOM.2004.1378237","DOIUrl":"https://doi.org/10.1109/GLOCOM.2004.1378237","url":null,"abstract":"We present an active MPLS service with bandwidth reservation for an advanced network called ISDN3. In essence, an active packet is employed to reserve a particular amount of bandwidth of a label switched path according to an adaptive pricing method. To maximize the network provider's earnings, a bandwidth selling policy is determined based on a Markov decision model. Analytical and simulation results are presented comparing the proposed bandwidth selling policy with two other schemes.","PeriodicalId":162046,"journal":{"name":"IEEE Global Telecommunications Conference, 2004. GLOBECOM '04.","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-11-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126154587","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
Delay constrained rate and power adaptation over correlated fading channels 时延约束速率和相关衰落信道的功率自适应
IEEE Global Telecommunications Conference, 2004. GLOBECOM '04. Pub Date : 2004-11-29 DOI: 10.1109/GLOCOM.2004.1379007
A. Karmokar, D. Djonin, V. Bhargava
{"title":"Delay constrained rate and power adaptation over correlated fading channels","authors":"A. Karmokar, D. Djonin, V. Bhargava","doi":"10.1109/GLOCOM.2004.1379007","DOIUrl":"https://doi.org/10.1109/GLOCOM.2004.1379007","url":null,"abstract":"We present a general Markov decision process based framework for the identification of optimal delay-constrained rate adaptation for MQAM systems and power adaptation for type-I hybrid ARQ systems. This framework can be applied to adaptive resource allocation over correlated fading channels. It is shown that the optimal rate and power control can be obtained by solving the appropriately formulated Markov decision processes using linear programming techniques. In the case of adaptive MQAM systems, the optimal rate allocation policy is dependent on the current buffer occupancy and the channel state. For hybrid ARQ systems the power control law can be formulated as being dependent on the current buffer occupancy and the history record of channel and action observations. The results of this paper are of importance for the development of modern wireless standards that support delay sensitive multimedia traffic.","PeriodicalId":162046,"journal":{"name":"IEEE Global Telecommunications Conference, 2004. GLOBECOM '04.","volume":"143 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-11-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123754748","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: 36
Global stability conditions for rate control of discretized model with communication delays 具有通信延迟的离散模型速率控制的全局稳定条件
IEEE Global Telecommunications Conference, 2004. GLOBECOM '04. Pub Date : 2004-11-29 DOI: 10.1109/GLOCOM.2004.1378213
R. La, P. Ranjan, E. Abed
{"title":"Global stability conditions for rate control of discretized model with communication delays","authors":"R. La, P. Ranjan, E. Abed","doi":"10.1109/GLOCOM.2004.1378213","DOIUrl":"https://doi.org/10.1109/GLOCOM.2004.1378213","url":null,"abstract":"We adopt an optimization framework for the rate allocation problem proposed by Kelly and investigate the stability of a discretized system with arbitrary communication delays between network elements. We show that there is an underlying market structure, and the stability of this market equilibrium is directly related to the stability of the rate control system. We first derive general stability conditions and use them to establish the stability of the system with a family of popular utility and resource price functions. Numerical examples are provided to validate our analyses.","PeriodicalId":162046,"journal":{"name":"IEEE Global Telecommunications Conference, 2004. GLOBECOM '04.","volume":"111 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-11-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126642419","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: 4
Active misconfiguration detection in Ethernet networks based on analysis of end-to-end anomalies 基于端到端异常分析的以太网主动错配置检测
IEEE Global Telecommunications Conference, 2004. GLOBECOM '04. Pub Date : 2004-11-29 DOI: 10.1109/GLOCOM.2004.1378035
Antonio Magnaghi, Jingsha He, T. Chujo, T. Katsuyama
{"title":"Active misconfiguration detection in Ethernet networks based on analysis of end-to-end anomalies","authors":"Antonio Magnaghi, Jingsha He, T. Chujo, T. Katsuyama","doi":"10.1109/GLOCOM.2004.1378035","DOIUrl":"https://doi.org/10.1109/GLOCOM.2004.1378035","url":null,"abstract":"This paper addresses the detection of duplexity mismatch (DM) of media access devices in Ethernet networks. From the broad spectrum of sources we surveyed, including logging data from real networks, it appears that DM is surprisingly common and very severe. We show how DM introduces degenerative traffic anomalies capable of drastically reducing flow throughput. We, then, propose a novel detection algorithm based on end-to-end active probing. Our investigation is complemented by the implementation of a SW prototype. Extensive experimental evaluation is conducted in a real-world production LAN. The achieved results are encouraging and show that our prototype can be a very useful tool. Our evaluation attained a high success rate of misconfiguration detection: 99.72%. False positive and false negative rates are extremely contained: 0.00% and 0.28%, respectively. Therefore, our prototype appears to be a robust and reliable detection instrument from which network administrators and field engineers can benefit.","PeriodicalId":162046,"journal":{"name":"IEEE Global Telecommunications Conference, 2004. GLOBECOM '04.","volume":"49 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-11-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116114662","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
Blind channel estimation for MIMO-OFDM systems using virtual carriers 基于虚拟载波的MIMO-OFDM系统盲信道估计
IEEE Global Telecommunications Conference, 2004. GLOBECOM '04. Pub Date : 2004-11-29 DOI: 10.1109/GLOCOM.2004.1378450
Changyong Shin, E. Powers
{"title":"Blind channel estimation for MIMO-OFDM systems using virtual carriers","authors":"Changyong Shin, E. Powers","doi":"10.1109/GLOCOM.2004.1378450","DOIUrl":"https://doi.org/10.1109/GLOCOM.2004.1378450","url":null,"abstract":"Multiple-input multiple-output (MIMO) orthogonal frequency division multiplexing (OFDM) systems are attractive because of their large capacity and high data rate. The paper presents a blind channel estimation method for MIMO-OFDM systems with and without a cyclic prefix (CP) by using the presence of virtual carriers. The proposed method is based on the noise subspace method. In addition, we establish a sufficient condition for channels to be identifiable. The proposed algorithm can be applied to MIMO-OFDM systems with insufficient CP or no CP, thereby potentially increasing channel utilization. Furthermore, by using reduced CP or no CP, the proposed method can achieve lower computational complexity. We present simulation results demonstrating the performance of the proposed method via numerical experiments.","PeriodicalId":162046,"journal":{"name":"IEEE Global Telecommunications Conference, 2004. GLOBECOM '04.","volume":"206 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-11-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116124127","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
An integrated network management system with online traffic engineering for optical label switching networks 光标签交换网络综合网络管理系统
IEEE Global Telecommunications Conference, 2004. GLOBECOM '04. Pub Date : 2004-11-29 DOI: 10.1109/GLOCOM.2004.1378299
Jinqiang Yang, S. Yoo
{"title":"An integrated network management system with online traffic engineering for optical label switching networks","authors":"Jinqiang Yang, S. Yoo","doi":"10.1109/GLOCOM.2004.1378299","DOIUrl":"https://doi.org/10.1109/GLOCOM.2004.1378299","url":null,"abstract":"This paper presents an integrated network management system (INMS) for optical-label switching networks. The INMS addresses the issues of managing multi-layer heterogeneous networks in an integrated way; and it provides a platform for integrated multi-layer (IP/WDM) traffic engineering, fault management, and restoration. We demonstrate a prototype implementation of the INMS, which performs on-line traffic engineering over label switching and optical circuit switching layers with integrated intelligence.","PeriodicalId":162046,"journal":{"name":"IEEE Global Telecommunications Conference, 2004. GLOBECOM '04.","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-11-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122494784","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
Energy efficient JPEG 2000 image transmission over wireless sensor networks 节能JPEG 2000图像传输无线传感器网络
IEEE Global Telecommunications Conference, 2004. GLOBECOM '04. Pub Date : 2004-11-29 DOI: 10.1109/GLOCOM.2004.1378853
Wei Yu, Z. Sahinoglu, A. Vetro
{"title":"Energy efficient JPEG 2000 image transmission over wireless sensor networks","authors":"Wei Yu, Z. Sahinoglu, A. Vetro","doi":"10.1109/GLOCOM.2004.1378853","DOIUrl":"https://doi.org/10.1109/GLOCOM.2004.1378853","url":null,"abstract":"We propose an energy efficient JPEG 2000 image transmission system over point-to-point wireless sensor networks. The objective is to minimize the overall processing and transmission energy consumption with the expected end-to-end QoS guarantee, which is achieved by jointly adjusting the source coding schemes, channel coding rates, and transmitter power levels in an optimal way. The advantages of the proposed system lie in three aspects: adaptivity, optimality, and low complexity. Based on the characteristics of the image content, the estimated channel conditions, and the distortion constraint, the proposed low-complexity joint source channel coding and power control algorithm adjusts the coding and transmission strategies adaptively, which can approximate the optimal solution with a tight bound.","PeriodicalId":162046,"journal":{"name":"IEEE Global Telecommunications Conference, 2004. GLOBECOM '04.","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-11-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122630661","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: 87
CPLD-PGPS scheduling algorithm in wireless OFDM systems 无线OFDM系统中的CPLD-PGPS调度算法
IEEE Global Telecommunications Conference, 2004. GLOBECOM '04. Pub Date : 2004-11-29 DOI: 10.1109/GLOCOM.2004.1379066
Z. Diao, D. Shen, V. Li
{"title":"CPLD-PGPS scheduling algorithm in wireless OFDM systems","authors":"Z. Diao, D. Shen, V. Li","doi":"10.1109/GLOCOM.2004.1379066","DOIUrl":"https://doi.org/10.1109/GLOCOM.2004.1379066","url":null,"abstract":"In this paper, we propose a new scheduler for orthogonal frequency-division multiplexing (OFDM) wireless communication systems, called channel-condition and packet-length dependent packet generalized processor sharing (CPLD-PGPS) scheduler. The CPLD scheduler considers the condition of the physical channel and the length of packets at the same time, and optimally allocates the subcarriers in a frame. With this scheduler the system can achieve better system BER performance, and correspondingly superior PER performance. The system throughput is improved, at the same time the required bandwidth is guaranteed, and long term fairness for all the traffic in the system is provided. In order to reduce the algorithm complexity, a simplified CPLD is proposed, which maintains the system throughput as in the original scheduler, and guarantees the system performance with properly set system parameters. The superior performance of the proposed scheduler is demonstrated by simulation results.","PeriodicalId":162046,"journal":{"name":"IEEE Global Telecommunications Conference, 2004. GLOBECOM '04.","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-11-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114296842","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
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