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Author : Feng Wan
Publisher :
ISBN 13 :
Total Pages : 472 pages
Book Rating : 4.:/5 (462 download)
Download or read book Signal-perturbation-free Semi-blind Channel Estimation for MIMO-OFDM Systems written by Feng Wan and published by . This book was released on 2009 with total page 472 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Jianjun Ran
Publisher : Cuvillier Verlag
ISBN 13 : 3867276498
Total Pages : 161 pages
Book Rating : 4.8/5 (672 download)
Download or read book Signal Processing, Channel Estimation and Link Adaptation in MIMO-OFDM Systems written by Jianjun Ran and published by Cuvillier Verlag. This book was released on 2008 with total page 161 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Shaodan Ma
Publisher : Open Dissertation Press
ISBN 13 : 9781361469330
Total Pages : pages
Book Rating : 4.4/5 (693 download)
Download or read book Semi-Blind Signal Detection for Mimo and Mimo-Ofdm Systems written by Shaodan Ma and published by Open Dissertation Press. This book was released on 2017-01-27 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This dissertation, "Semi-blind Signal Detection for MIMO and MIMO-OFDM Systems" by Shaodan, Ma, 馬少丹, was obtained from The University of Hong Kong (Pokfulam, Hong Kong) and is being sold pursuant to Creative Commons: Attribution 3.0 Hong Kong License. The content of this dissertation has not been altered in any way. We have altered the formatting in order to facilitate the ease of printing and reading of the dissertation. All rights not granted by the above license are retained by the author. Abstract: Abstract of thesis entitled "Semi-Blind Signal Detection for MIMO and MIMO-OFDM Systems" Submitted by Ma Shaodan for the degree of Doctor of Philosophy at The University of Hong Kong in May 2006 MIMO (Multiple Input Multiple Output) and MIMO-OFDM (Orthogonal Frequency Division Multiplexing) systems have attracted a lot of research interest in recent years due to their potential for future high speed wireless communications. This thesis focuses on the problem of signal detection and proposes three semi-blind algorithms for MIMO, MIMO-OFDM with short cyclic prefix (CP), and MIMO- OFDM without CP, respectively. A three-step semi-blind Rake-based multi-user detection technique is proposed for quasi-synchronous MIMO systems. The first step separates the multi-user multi-path signal vector into multi-user single-path signal vectors based on second-order statistics (SOS) of the received signals. A simple estimation method is proposed in the second step to estimate the time delays with the aid of pilots. The third step combines multiple multi-user single-path signal vectors for signal detection. System performance is improved by time diversity and only the upper bounds of the channel length and the time delays are required. Simulation results show that the proposed technique achieves good performance and is not sensitive to over-estimation of the maximum channel length and the maximum time delay. A MIMO-OFDM system with short CP is next considered for higher bandwidth efficiency and a time domain semi-blind signal detection algorithm is proposed. A new system model in which the i th received OFDM symbol is left shifted by J samples is introduced. Based on some structural properties of the new system model, an equalizer is designed using SOS of the received signals to cancel most of the inter- symbol interference (ISI). The transmitted signals are then detected from the equalizer output. In the proposed algorithm, only 2P ( P is the number of transmit antennas/users in MIMO-OFDM systems) columns of the channel matrix need to be estimated, and channel length estimation is unnecessary. In addition, the proposed algorithm is applicable irrespective of whether the channel length is shorter than, equal to or longer than the CP length. Simulation results verify the effectiveness of the proposed algorithm, and show that it outperforms the existing ones in all cases. Finally, in order to further improve bandwidth efficiency, a MIMO-OFDM system without CP is considered and a two-step semi-blind signal detection algorithm is proposed. The algorithm is based on some structural properties derived from shifting the received OFDM symbols. The first step cancels inter-carrier interference (ICI) and ISI with an equalizer designed using SOS of the shifted received OFDM symbols. The second step involves signal detection from the equalizer output in which the signals are still corrupted with multi-antenna interference (MAI). In the proposed algorithm, precise knowledge of the channel length is unnecessary and only one pilot OFDM symbol is utilized to estimate the required channel state information. Simulation results show that the proposed algorithm achieves comparable performance to algorithms for standard MIMO-OFDM systems and it is robust against channel length overestimation. The number of words: 460 DOI: 10.5353/th_b3684656 Subjects: Signal detection Algorithms MIMO systems Orthogonal
Author : Shaodan Ma
Publisher :
ISBN 13 :
Total Pages : 180 pages
Book Rating : 4.:/5 (854 download)
Download or read book Semi-blind Signal Detection for MIMO and MIMO-OFDM Systems written by Shaodan Ma and published by . This book was released on 2006 with total page 180 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : 江建達
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (899 download)
Download or read book Blind Channel Estimation for Orthogonal Space-time Block Coded MIMO-OFDM Systems written by 江建達 and published by . This book was released on 2013 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Dr.Maddala Vijayalakshmi
Publisher : Archers & Elevators Publishing House
ISBN 13 : 8119385969
Total Pages : 58 pages
Book Rating : 4.1/5 (193 download)
Download or read book EFFECTIVE SPARSE CHANNEL ESTIMATION TECHNIQUE FOR MIMO-OFDM SYSTEM written by Dr.Maddala Vijayalakshmi and published by Archers & Elevators Publishing House. This book was released on with total page 58 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : 陳柏廷
Publisher :
ISBN 13 :
Total Pages : 148 pages
Book Rating : 4.:/5 (81 download)
Download or read book Finite Sample Performance of Blind Channel Estimation and Equalization for MIMO-OFDM Systems with Few Blocks written by 陳柏廷 and published by . This book was released on 2012 with total page 148 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : 葉逢傑
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (92 download)
Download or read book Subspace-based Blind Channel Estimation for Cyclic Prefixed Mimo-ofdm Systems Using Few Received Blocks written by 葉逢傑 and published by . This book was released on 2013 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Chao-Cheng Tu
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (697 download)
Download or read book Subspace-based Blind Channel Estimation and Tracking for MIMO-OFDM Systems written by Chao-Cheng Tu and published by . This book was released on 2010 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Stephan Sand
Publisher : Logos Verlag Berlin GmbH
ISBN 13 : 3832523855
Total Pages : 272 pages
Book Rating : 4.8/5 (325 download)
Download or read book Joint Iterative Channel and Data Estimation in High Mobility MIMO-OFDM Systems written by Stephan Sand and published by Logos Verlag Berlin GmbH. This book was released on 2010 with total page 272 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : 曾楷涵
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (896 download)
Download or read book Blind Channel Estimation Performance Analysis in MIMO Cyclic Prefixed OFDM Systems written by 曾楷涵 and published by . This book was released on 2014 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Ka Yau Ho
Publisher :
ISBN 13 :
Total Pages : 198 pages
Book Rating : 4.:/5 (184 download)
Download or read book A Generalized Semi-blind Channel Estimation for OFDM Systems written by Ka Yau Ho and published by . This book was released on 2007 with total page 198 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :
Publisher : ScholarlyEditions
ISBN 13 : 1464963738
Total Pages : 2454 pages
Book Rating : 4.4/5 (649 download)
Download or read book Issues in Electronic Circuits, Devices, and Materials: 2011 Edition written by and published by ScholarlyEditions. This book was released on 2012-01-09 with total page 2454 pages. Available in PDF, EPUB and Kindle. Book excerpt: Issues in Electronic Circuits, Devices, and Materials: 2011 Edition is a ScholarlyEditions™ eBook that delivers timely, authoritative, and comprehensive information about Electronic Circuits, Devices, and Materials. The editors have built Issues in Electronic Circuits, Devices, and Materials: 2011 Edition on the vast information databases of ScholarlyNews.™ You can expect the information about Electronic Circuits, Devices, and Materials in this eBook to be deeper than what you can access anywhere else, as well as consistently reliable, authoritative, informed, and relevant. The content of Issues in Electronic Circuits, Devices, and Materials: 2011 Edition has been produced by the world’s leading scientists, engineers, analysts, research institutions, and companies. All of the content is from peer-reviewed sources, and all of it is written, assembled, and edited by the editors at ScholarlyEditions™ and available exclusively from us. You now have a source you can cite with authority, confidence, and credibility. More information is available at http://www.ScholarlyEditions.com/.
Author : Elina Nayebi
Publisher :
ISBN 13 :
Total Pages : 172 pages
Book Rating : 4.:/5 (12 download)
Download or read book TDD Massive MIMO Systems written by Elina Nayebi and published by . This book was released on 2018 with total page 172 pages. Available in PDF, EPUB and Kindle. Book excerpt: With an ever-increasing demand for higher wireless throughput, there has been growing interest in massive multiple-input multiple-output (MIMO) as a key technology for future wireless networks. This dissertation addresses some of the key aspects of this technology that include: 1. precoding, power optimization, and access point (AP) location design in cell-free massive MIMO systems with distributed APs; 2. semi-blind channel estimation in massive MIMO systems. Cell-free massive MIMO is a special deployment of massive MIMO systems with a large number of distributed low-cost low-power single antenna APs serving a much smaller number of users. The cell-free system is not partitioned into cells and each user is served by all APs simultaneously. The downlink capacity lower bounds for conjugate beamforming and zero-forcing precoders in cell-free systems are derived in this dissertation. To further increase the achievable throughput, max-min power optimization algorithms are formulated, and low complexity max-min power allocation algorithms are developed. We also introduce a technique that employs L1-norm sparsity penalty in the max-min power optimization for conjugate beamforming that helps us decrease the number of APs that serve a user in a practical system. The uplink capacity lower bounds for minimum mean squared error (MMSE) and large scale fading decoding receivers in cell-free systems are provided. A deterministic approximation for signal-to-interference-plus-noise ratio of MMSE receiver is obtained with an unlimited number of APs and user devices. Next, AP location design problem is investigated to maximize the sum-throughput and the minimum-throughput in uplink transmission of cell-free systems with an arbitrary user distribution. Utilizing compressed sensing techniques, the AP placement problems are formulated as convex optimization problems. An AP location design algorithm is also presented in an alternative small-cell system in which each user is served by only one AP. Finally, semi-blind channel estimation for multiuser massive MIMO systems is investigated. Multiple semi-blind channel estimation techniques based on the expectation-maximization algorithm are developed by considering different priors on data symbols. Cramer Rao Bounds (CRBs) for semi-blind channel estimation are derived for deterministic and stochastic (Gaussian) data symbol models to give us an analytical understanding of the semi-blind scheme's performance. To get insight into the behavior of a massive MIMO system, the asymptotic behavior of the CRBs as the number of antennas at the base station grows is analyzed.
Author : Fabien Delestre
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (855 download)
Download or read book Channel Estimation and Performance Analysis of MIMO-OFDM Communications Using Space-time and Space-frequency Coding Schemes written by Fabien Delestre and published by . This book was released on 2011 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis is concerned with channel estimation and data detection of MIMO-OFDM communication systems using Space-Time Block Coding (STBC) and Space-Frequency Block Coding (SFBC) under frequency selective channels. A new iterative joint channel estimation and signal detection technique for both STBC-OFDM and SFBC-OFDM systems is proposed. The proposed algorithm is based on a processive sequence of events for space time and space frequency coding schemes where pilot subcarriers are used for channel estimation in the first time instant, and then in the second time instant, the estimated channel is used to decode the data symbols in the adjacent data subcarriers. Once data symbols are recovered, the system recursively performs a new channel estimation using the decoded data symbols as pilots. The iterative process is repeated until all MIMO-OFDM symbols are recovered. In addition, the proposed channel estimation technique is based on the maximum likelihood (ML) approach which offers linearity and simplicity of implementation. Due to the orthogonality of STBC and SFBC, high computation efficiency is achieved since the method does not require any matrix inversion for estimation and detection at the receiver. Another major novel contribution of the thesis is the proposal of a new group decoding method that reduces the processing time significantly via the use of sub-carrier grouping for transmitted data recovery. The OFDM symbols are divided into groups to which a set of pilot subcarriers are assigned and used to initiate the channel estimation process. Designated data symbols contained within each group of the OFDM symbols are decoded simultaneously in order to improve the decoding duration. Finally, a new mixed STBC and SFBC channel estimation and data detection technique with a joint iterative scheme and a group decoding method is proposed. In this technique, STBC and SFBC are used for pilot and data subcarriers alternatively, forming the different combinations of STBC/SFBC and SFBC/STBC. All channel estimation and data detection methods for different MIMO-OFDM systems proposed in the thesis have been simulated extensively in many different scenarios and their performances have been verified fully.
Author : Jie Gao
Publisher :
ISBN 13 :
Total Pages : 210 pages
Book Rating : 4.:/5 (645 download)
Download or read book Channel Estimation and Data Detection for Mobile MIMO OFDM Systems written by Jie Gao and published by . This book was released on 2005 with total page 210 pages. Available in PDF, EPUB and Kindle. Book excerpt: Designing spectral efficient, high-speed wireless links that offer high quality- of-service and range capability has been a critical research and engineering challenge. In this thesis, we mainly address the complexity and performance issues of channel estimation and data detection in multiple-input multiple-output (MIMO) orthogonal frequency division multiplexing (OFDM) systems over time-varying channels. We derive the probability density function (pdf) expressions of the condition number (i.e., the maximum-to-minimum-singular-value ratio, MMSVR) of the channel state information matrix of MIMO OFDM systems. It is shown that this ratio is directly related to the noise enhancement in open-loop systems and provides a significant insight on the system capacity. A decision-directed (DD) maximum a posteriori probability (MAP) channel estimation scheme of MIMO systems is derived. Error performance of a zero- forcing receiver with the DD MAP and perfect channel estimates is provided and compared. This scheme has a low complexity and can be applied to time-varying Rayleigh fading channels with an arbitrary spaced-time correlation function. We propose an iterative channel estimation and data detection scheme for MIMO OFDM systems in the presence of inter-carrier-interference (ICI) due to the nature of time-varying channels. An ICI-based minimum-mean-square error (MMSE) detection scheme is derived. An expectation-maximization (EM) based least square (LS) channel estimator is proposed to minimize the mean-square error (MSE) of the channel estimates and to reduce the complexity of the implementation. With the estimate of the channel and initially detected symbols, ICI is estimated and removed from the received signal. Thus more accurate estimation of the channel and data detection can be obtained in the next iteration. An EM-based MAP channel estimator is derived by exploiting the frequency/time correlation of the pilot and data sub-carriers. Performance comparison is made between the proposed schemes and the ideal case - time-invariant channels and perfect channel estimation. We optimize the data transmission by exploiting the long term correlation characteristics. The transmitted data is successively detected without an error floor in spatially correlated channels. The algorithms proposed in this thesis allow low-complexity implementation of channel estimation and data detection for MIMO OFDM systems over time-varying fading channels, while providing good error performance.
Author : Haideh M. Karkhanechi
Publisher :
ISBN 13 :
Total Pages : 290 pages
Book Rating : 4.:/5 (76 download)
Download or read book An EM-based Channel Estimation Algorithm for Space Time Block Coded MIMO OFDM Systems written by Haideh M. Karkhanechi and published by . This book was released on 2007 with total page 290 pages. Available in PDF, EPUB and Kindle. Book excerpt:
