检索结果-内蒙古大学图书馆

Joint semi-blind channel estimation and data detection for MIMO-OFDM systems

Joint semi-blind channel estimation and data detection for M...

Proceedings of the IEEE 6th Circuits and Systems Symposium on Emerging Technologies: Frontiers of Mobile and Wireless Communication

作者： Yue, Jiang Kim, Kyeong Jin Reid, Tony Gibson, Jerry D. Department of Electrical Engineering Southern Methodist University Dallas TX 75275 Nokia Research Center 6000 Connection Dr. Irving TX 75039 Media Arts and Technology Program Electrical and Computer Engineering University of California Santa Barbara Santa Barbara CA 93106-6065

ISBN: (纸本)0780379381

In MEMO systems, where multiple antennas are used at both transmitter and receiver to achieve high spectral efficiency, channel impulse reponses are often assumed to be constant over a block or packet This assumption of block stationarity on channels is valid for most fixed wireless scenarios. However, for communications in a high mobility environment, the assumption will result in considerable performance degradation. In this paper, we focus on channel estimation for a MIMO system with OFDM transmission technique. In our system, pilots are placed on NP subcarriers for a novel channel estimation at the receiver with Kalman filters. With the channels estimated by a Kalman filter, we apply the QRD-M algorithm for suboptimal data detection with reasonable computational cost The outputs of data detection are fed back to another Kalman filter for an improved channel estimation. By alternatively and iteratively using these two Kalman filters, a better channel estimation can be obtained. A simulation result of the bit error rate shows the improvement of 10 dB in SNR with four iterations over non-iteration.

关键词： Orthogonal frequency division multiplexing

来源：评论

学校读者我要写书评

暂无评论

Functional optical coherence tomography of neurophysiology

Functional optical coherence tomography of neurophysiology

引用

Biomedical Topical Meeting, BIOMED 2004

作者： Boppart, Stephen A. Lazebnik, Mariya Vinegoni, Claudio Bowonder, Anupama Marks, Daniel L. Gillette, Rhanor Department of Electrical and Computer Engineering Beckman Institute for Advanced Science and Technology Bioengineering Program College of Medicine University of Illinois at Urbana-Champaign 405 N. Mathews Ave. UrbanaIL61801 United States Department of Electrical and Computer Engineering Beckman Institute for Advanced Science and Technology University of Illinois at Urbana-Champaign United States Department of Molecular and Integrative Physiology University of Illinois at Urbana-Champaign United States

Functional optical coherence tomography (fOCT) is used to record optical changes that correspond to spontaneous and stimulated electrical activity in neural tissue. FOCT provides a high-resolution, real-time, non-inva... 详细信息

ISBN: (纸本)1557527695

关键词： Optical tomography

来源：评论

学校读者我要写书评

暂无评论

System dynamics of supply chain network organization structure

引用

Information Systems and e-Business Management 2004年第2期2卷 187-206页

作者： Zhang, Yong Dilts, David Management of Technology Program Vanderbilt University Electrical Engineering & Computer Science Department School of Engineering Nashville USA Owen Graduate School of Management Vanderbilt University Nashville USA

Information technology is providing manufacturers with additional flexibility with regard to their supply chain network choices. Our research studies supply chain network organization structures categorized by the organic and mechanistic management control structures. The structural impacts on cost and fill rate performance are studied in two-echelon and two-supply-chain network organization models under different market coordination conditions using system dynamic simulations. Our results show significant effects of demand and network structural factors, and their interactions, on these measures. As demand becomes dynamic, the cooperative interaction model, where supply chains cooperate to satisfy customer demand, is found to have better system performance than the competitive supply chain model. The analysis also suggests that increasing the responsiveness at the downstream plant is particularly important to the overall system performance improvement.

关键词：

来源：评论

学校读者我要写书评

暂无评论

A proposal for an integrated utilities engineering-Management M.S. program

A proposal for an integrated utilities Engineering-Managemen...

引用

2004 37th Annual Frontiers of Power Conference

作者： Barnes, Frank S. Fuchs, Ewald F. Tietjen, Jill S. Silverstein, Joann Ko, Hon-Yim Lookabaugh, Tom Brown, Timothy X. Sicker, Douglas C. University of Colorado AAAS IEEE International Engineering Consortium National Academy of Engineering Department of Electrical Engineering LLC McNeil Technologies Board for Girl Scouts Mile Hi Council Georgia Transmission Corporation of Tucker GA ABET Inc. National Council of Examiners for Engineering and Surveying SWE IEEE Power Engineering Society Department of Civil Environmental and Architectural Engineering UCB National Water Research Institute Women in Engineering Program Center of the American West College of Engineering Department of Civil Environmental and Archetectural Engineering University of Colorado Jet Propulsion Laboratory Computer Science Department Interdisciplinary Telecommunications Program University of Colorado Boulder University of Colorado Boulder Electrical Engineering and Interdisciplinary Telecommunications University of Colorado Boulder Department of Computer Science University of Colorado Boulder ITP Laboratory ACM Internet Society Faculty of the Progress and Freedom Foundation Institute for Regulatory Law and Economics Aspen Institute Communications and Society Program CU Computer and Communications Security Center Center for Science and Technology Policy Research Research and Engineering Center for Unmanned Vehicles Electrical and Computer Engineering Civil Environmental and Architectural Engineering

Electric, water, gas and transportation utilities face severe challenges associated with security, quality, availability, reliability and profitability issues. They must solve interrelated system problems with respect to generation of electricity, transportation of fuel, and potable as well as waste water. In the future, engineers and managers of utilities must be well versed in the different disciplines of engineering including electrical civil, mechanical and information technology. The University of Colorado at Boulder addresses this educational opportunity by proposing a novel Integrated Utilities Management program for M.S. candidates who have a solid B.S. background or equivalent in a related discipline. The M.S. program will consist of four interdisciplinary paths dealing with business management and legal topics as they relate to federal and state regulatory issues, as well as agency and people-related leadership issues. The electric utilities option of this program will be centered on three core courses related to electric power generation/transmission and distribution, security and availability, quality and reliability, economics and environmental policy, and utility finance;two elective courses from a group of courses that address nuclear power, waste water, solid waste, telecommunications, renewable energies, data communication, fuels and case studies;and one capstone course consisting of either operations research or the investigation and resolution of a pending utility project such as the right-of-way of transmission lines, specification of new power plants, retrofitting of power plants or their impact on the environment. It is expected that candidates for this MS program will come from universities, from utilities, and from private and public agencies. The MS program can be completed by full- or part time students within one or two years of intensive study, respectively. Courses will be taught both on campus and nationwide via the Center for Advanced

关键词： Public utilities

来源：评论

学校读者我要写书评

暂无评论

Optical coherence tomography of breast cancer: Feasibility for surgical guidance

Optical coherence tomography of breast cancer: Feasibility f...

引用

Biomedical Topical Meeting, BIOMED 2004

作者： Bredfeldt, Jeremy S. Luo, Wei Marks, Daniel L. Singletary, Keith W. Wisseman, Charles L. Johnson, Patricia A. Boppart, Stephen A. Beckman Institute for Advanced Science and Technology University of Illinois at Urbana-Champaign United States Department of Food Science and Human Nutrition Functional Foods for Health Program University of Illinois at Urbana-Champaign United States Surgical Pathology and Oncology Carle Foundation Hospital UrbanaIL United States Department of Electrical and Computer Engineering Beckman Institute for Advanced Science and Technology Bioengineering Program College of Medicine University of Illinois at Urbana-Champaign 405 N. Mathews Avenue UrbanaIL61801 United States

We present the use of OCT for breast cancer imaging. In situ rat mammary and excised human breast tumors were imaged. The feasibility of OCT for applications in surgical oncology of the breast is discussed. © 200... 详细信息

ISBN: (纸本)1557527695

关键词： Optical tomography

来源：评论

学校读者我要写书评

暂无评论

Multi-modality three-dimensional optical imaging of engineered tissues

Multi-modality three-dimensional optical imaging of engineer...

引用

Biomedical Topical Meeting, BIOMED 2004

作者： Tan, Wei Fahrner, Lester J. Sendemir-Urkmez, Aylin Jamison, Russell D. Leckband, Deborah E. Boppart, Stephen A. Beckman Institute for Advanced Science and Technology University of Illinois at Champaign-Urbana UrbanaIL61801 United States Department of Materials Science and Engineering University of Illinois at Champaign-Urbana UrbanaIL61801 United States Department of Chemical Engineering University of Illinois at Champaign-Urbana UrbanaIL61801 United States Department of Electrical and Computer Engineering Bioengineering Program Beckman Institute for Advanced Science and Technology College of Medicine University of Illinois at Urbana-Champaign 405 North Mathews Avenue UrbanaIL61801 United States

Optical coherence tomography (OCT), confocal, and multiphoton microscopy are used to nondestructively monitor in situ cell distribution and cell-matrix interaction in 3-D engineered tissues composed of chitosan scaffo... 详细信息

ISBN: (纸本)1557527695

关键词： Tissue

来源：评论

学校读者我要写书评

暂无评论

Space-time signaling based on Kerdock and Delsafte-Goethals codes

Space-time signaling based on Kerdock and Delsafte-Goethals ...

引用

IEEE International Conference on Communications (ICC)

作者： A.R. Calderbank S.N. Diggavi N. Al-Dhahir Program in Applied and Computational Mathematics Princeton University Princeton NJ USA School of Computer and Communication Sciences Swiss Federal Institute of Technology Lausanne Switzerland Department of Electrical Engineering University of Technology Dallas TX USA

This paper designs space-time codes for standard PSK and QAM signal constellations that have flexible rate, diversity and require no constellation expansion. Central to this construction are binary partitions of the PSK and QAM constellations that appear in codes designed for the Gaussian channel. The space-time codes presented here are designed by separately specifying the different levels of the binary partition in the space-time array. The individual levels are addressed by either the binary symmetric matrices associated with codewords in a Kerdock code or other families of binary matrices. Binary properties of these sets are sufficient to verify the diversity property of the codewords in the complex domain. Larger sets of binary symmetric matrices (such as the set used in Delsarte-Goethals codes) are used to trade diversity protection for increased rate.

关键词： Space time codes Phase shift keying Quadrature amplitude modulation Constellation diagram Symmetric matrices Binary phase shift keying Quadrature phase shift keying Transmitting antennas Fading Mathematics

来源：评论

学校读者我要写书评

暂无评论

Joint semiblind channel estimation and data detection for MIMO-OFDM systems

Joint semiblind channel estimation and data detection for MI...

引用

Proceedings of the IEEE Circuits and Systems Symposium on Emerging Technologies

作者： Jiang Yue Kyeong Jin Kim T. Reid J.D. Gibson Department of Electrical Engineering Southern Methodist University Dallas TX USA Nokia Research Center TX Nokia Research Center Irving TX USA Media Arts and Technology Program and Electrical & Computer Engineering University of California Santa Barbara Santa Barbara CA

In MIMO systems, where multiple antennas are used at both transmitter and receiver to achieve high spectral efficiency, channel impulse responses are often assumed to be constant over a block or packet. This assumption of block stationarity on channels is valid for most fixed wireless scenarios. However, for communications in a high mobility environment, the assumption will result in considerable performance degradation. In this paper, we focus on channel estimation for a MIMO system with OFDM transmission technique. In our system, pilots are placed on N/sub P/ subcarriers for a novel channel estimation at the receiver with Kalman filters. With the channels estimated by a Kalman filter, we apply the QRD-M algorithm for suboptimal data detection with reasonable computational cost. The outputs of data detection are fed back to another Kalman filter for an improved channel estimation. By alternatively and iteratively using these two Kalman filters, a better channel estimation can be obtained. A simulation result of the bit error rate shows the improvement of 10 dB in SNR with four iterations over noniteration.

关键词： Channel estimation MIMO Receiving antennas Transmitting antennas Transmitters Degradation OFDM Iterative algorithms Computational efficiency Computational modeling

来源：评论

学校读者我要写书评

暂无评论

Voice transmission over all-IP tandem links

Voice transmission over all-IP tandem links

引用

Conference Record of the Thirty-Seventh Asilomar Conference on Signals, Systems and computers

作者： Wei, Bo Gibson, Jerry D. Department of Electrical Engineering Southern Methodist University Dallas TX 75275 Media Arts Technology Program Electrical and Computer Engineering Univ. of California Santa Barbara Santa Barbara CA 93106-6065

We investigate the issues in voice communications using IP over tandem connections of wireline and wireless links with the goal of determining end-to-end system performance. We study the particular example of using G.711 speech coding in the backbone wireline network and Adaptive Multi-rate (AMR) speech coding in a wireless LAN tandem network and study the impact of specific methods of adaptive re-encoding, error concealment, error control coding, and network protocol design to deliver the desired end-to-end quality of service. In addition to simulation results and objective speech quality measures, we present estimation-theoretic and information-theoretic analyses for the tandem packet loss link connections.

关键词： Telecommunication links

来源：评论

学校读者我要写书评

暂无评论

Realization adaptive strategies and a comparison of Fourier bandwidth, Shannon bandwidth, and Campbell bandwidth

Realization adaptive strategies and a comparison of Fourier ...

引用

Data Compression Conference, DCC 2003

作者： Tang, Wenye He, Tao Gibson, Jerry D. Globespan Virata Inc. 100 SchulzDrive Red BankNJ07701 United States Electrical Engineering Department Southern Methodist University DallasTX75275 United States Media Arts and Technology Program and Electrical and Computer Engineering University of California at Santa Barbara Santa BarbaraCA93106 United States

ISBN: (纸本)0769518966

In 1960, Campbell derived a quantity that he defined as the coefficient rate of a random process that involves the process spectral entropy. However, no potential applications of the coefficient rate were identified. Two new derivations of Campbell's rate coefficient rate are presented. One derivation solidifies the interpretation of this quantity as a coefficient rate and allows definition of an effective bandwidth for the process. The second derivation implies a new approach for realization adaptive source compression. The coefficient rate can be used for realization adaptive coefficient selection in a sequence of source representations. Furthermore, the effective bandwidth is designated as Campbell bandwidth and contrasted with Fourier bandwidth and Shannon bandwidth. Several specific examples are presented that illustrate the differences among the three quantities. © 2003 IEEE.

关键词： Entropy

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：