Semi Blind Channel Estimation Using Second Order Statistics and Its Application to Time Reversal Space Time Block Codes PDF Download
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Author: Hemanth Mullar Srikantaiah
Publisher:
ISBN:
Category :
Languages : en
Pages : 86
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Book Description
Author: Hemanth Mullar Srikantaiah
Publisher:
ISBN:
Category :
Languages : en
Pages : 86
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Book Description
![Blind Channel Estimation for Orthogonal Space-time Block Codes in MISO Systems [microform] PDF](https://books.google.com/books/content/images/frontcover/OrfgAAAACAAJ?fife=w80-h100)
Author: Elzbieta Beres
Publisher: National Library of Canada = Bibliothèque nationale du Canada
ISBN: 9780612914728
Category :
Languages : en
Pages : 126
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Book Description
This thesis presents a closed-form, blind channel estimation scheme for Alamouti's and other orthogonal STBC. Unlike other blind channel estimation algorithms used in such systems, the scheme is able to estimate the channels, to within a phase constant, in multiple-input single-output systems, i.e. systems that employ only one receive antenna. The channel matrix is estimated from the eigenvalue decomposition of the fourth order cumulant matrix of the output signal. The performance of the scheme depends partly upon the accuracy of the estimated cumulants, and thus a scheme to improve the cumulant matrix estimate is suggested. Using these improved cumulants, the algorithm performs very well in slowly changing channel conditions. A single pilot-tuple is required to correctly assign the estimated to the actual channels and to resolve the phase ambiguity common to all blind estimators. The main disadvantage of the scheme is its higher complexity related to the estimation of higher order cumulants; this complexity can be reduced by exploiting the symmetry inherent in the cumulant matrix. Furthermore, it is shown that to achieve good performance in terms of bit error rate, 1000 sample points are sufficient to estimate the cumulant matrix.
Author: Nejib Ammar
Publisher:
ISBN:
Category :
Languages : en
Pages : 340
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Author:
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Category : Computers
Languages : en
Pages : 584
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Author: Erik G. Larsson
Publisher: Cambridge University Press
ISBN: 9780521065337
Category : Technology & Engineering
Languages : en
Pages : 304
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Book Description
Space-time coding is a technique that promises greatly improved performance in wireless networks by using multiple antennas at the transmitter and receiver. Space-Time Block Coding for Wireless Communications is an introduction to the theory of this technology. The authors develop the topic using a unified framework and cover a variety of topics ranging from information theory to performance analysis and state-of-the-art space-time coding methods for both flat and frequency-selective fading multiple-antenna channels. The authors concentrate on key principles rather than specific practical applications, and present the material in a concise and accessible manner. Their treatment reviews the fundamental aspects of multiple-input, multiple output communication theory, and guides the reader through a number of topics at the forefront of current research and development. The book includes homework exercises and is aimed at graduate students and researchers working on wireless communications, as well as practitioners in the wireless industry.
Author:
Publisher:
ISBN:
Category : Engineering
Languages : en
Pages : 2264
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Book Description
Since its creation in 1884, Engineering Index has covered virtually every major engineering innovation from around the world. It serves as the historical record of virtually every major engineering innovation of the 20th century. Recent content is a vital resource for current awareness, new production information, technological forecasting and competitive intelligence. The world?s most comprehensive interdisciplinary engineering database, Engineering Index contains over 10.7 million records. Each year, over 500,000 new abstracts are added from over 5,000 scholarly journals, trade magazines, and conference proceedings. Coverage spans over 175 engineering disciplines from over 80 countries. Updated weekly.
Author: David Tse
Publisher: Cambridge University Press
ISBN: 9780521845274
Category : Computers
Languages : en
Pages : 598
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Book Description
This textbook takes a unified view of the fundamentals of wireless communication and explains cutting-edge concepts in a simple and intuitive way. An abundant supply of exercises make it ideal for graduate courses in electrical and computer engineering and it will also be of great interest to practising engineers.
![Asymmetric and Self-matching Modulations for Estimation-assisted Detection in Fading Channels [microform] PDF](https://books.google.com/books/content/images/frontcover/FeF5tgAACAAJ?fife=w80-h100)
Author: Stephen Wai-Bun Lam
Publisher: Library and Archives Canada = Bibliothèque et Archives Canada
ISBN: 9780494027714
Category :
Languages : en
Pages : 398
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Book Description
In multiplicative fading channels, the commonly used symmetric signal constellations and space-time block codes cause ambiguities since joint channel estimation and data detection (CE/DD) schemes cannot differentiate certain sequences of symbols in single-input single-output (SISO) systems and certain sequences of space-time block codewords in multiple-input multiple-output (MIMO) systems. This phenomenon; known as isometry; leads to irreducible estimation and detection error floors. Since the channel state has to be estimated in most practical communications systems, isometry degrades the performances of such systems. This thesis introduces a unifying framework that effectively eliminates isometry by using asymmetric modulation schemes: one algorithm is proposed to construct asymmetric signal constellations to solve isometry in SISO systems, two algorithms are proposed to construct asymmetric space-time block codes (STBCs) to mitigate isometry. To further improve the estimation and detection performances of CE/DD schemes, a self-matching STBC is proposed in this thesis. The self-matching STBC improves detection performance by adapting its code properties according to the estimation error calculated by the Kalman recursion; by improving estimation performance using embedded training, and by breaking isometry with asymmetry. These asymmetric modulation schemes are shown in this thesis, both analytically and via simulations, to be novel, simple, effective and robust solutions to isometry.
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 96
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Book Description
The Bulletin of the Atomic Scientists is the premier public resource on scientific and technological developments that impact global security. Founded by Manhattan Project Scientists, the Bulletin's iconic "Doomsday Clock" stimulates solutions for a safer world.
Author: Arogyaswami Paulraj
Publisher: Cambridge University Press
ISBN: 9780521826150
Category : Computers
Languages : en
Pages : 314
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Book Description
An accessible introduction to the theory of space-time wireless communications.
