Layered Space Time Structure For Mimo Ofdm Systems
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Layered Space Time Structure For Mimo Ofdm Systems
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Author : Jianxuan Du
language : en
Publisher:
Release Date : 2005
Layered Space Time Structure For Mimo Ofdm Systems written by Jianxuan Du and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2005 with MIMO systems categories.
The low complexity of layered processing makes the layered structure a promising candidate for MIMO systems with a large number of transmit antennas and higher order modulation. For broadband systems, orthogonal frequency division multiplexing (OFDM) appears promising for its immunity against delay spread. In addition, OFDM is especially suitable for frequency selective MIMO systems since the introduction of orthogonal subcarriers makes system design and implementation as simple as those for flat fading channels. Therefore, the combination of layered structure with OFDM is a promising technique for high-speed wireless data transmission. The proposed research is focused on the layered structure for MIMO-OFDM systems, where several techniques are proposed for performance enhancement, namely, channel estimation based on subspace tracking, parallel detection of group-wise space-time codes by predictive soft interference cancellation, quasi-block diagonal low-density parity-check codes (LDPC) coding and statistical data rate allocation for layered systems. For MIMO-OFDM systems, rank reduction by some linear transform matrix is necessary for channel estimation. In the proposed research, we propose a channel estimation algorithm for MIMO-OFDM systems, which uses the optimum low-rank channel approximation obtained by tracking the frequency autocorrelation matrix of the channel response. Then parallel detection algorithm is proposed for a modified layered system with group-wise space-time coding, where the structure of particular component space-time code trellises is exploited using partial information from the Viterbi decoder of the simultaneously decoded interfering component codes. Next we incorporate the layered structure with LDPC to develop a quasi-block diagonal LDPC space-time structure. The lower triangular structure of the parity check matrix introduces correlation between layers. Each layer, as a part of the whole codeword, can be decoded while taking information from other undetected layers to improve the decoding performance. In the end, a modified layered structure is proposed where the layer detection order is fixed and the data rate for each layer is allocated based on the detection order and channel statistics. With Gaussian approximation of layer capacities, we derive the optimum data rate allocation.
Space Time Codes And Mimo Systems
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Author : Mohinder Jankiraman
language : en
Publisher: Artech House
Release Date : 2004
Space Time Codes And Mimo Systems written by Mohinder Jankiraman and has been published by Artech House this book supported file pdf, txt, epub, kindle and other format this book has been release on 2004 with Computers categories.
Annotation "This resource takes professionals step by step from the basics of MIMO through various coding techniques, to critical topics such as multiplexing and packet transmission. Practical examples are emphasized and mathematics is kept to a minimum, so readers can quickly and thoroughly understand the essentials of MIMO. The book takes a systems view of MIMO technology that helps professionals analyze the benefits and drawbacks of any MIMO system."--BOOK JACKET.Title Summary field provided by Blackwell North America, Inc. All Rights Reserved.
Multilayered Space Time Coding For Mimo Systems
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Author : May Gomaa
language : en
Publisher:
Release Date : 2008
Multilayered Space Time Coding For Mimo Systems written by May Gomaa and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2008 with categories.
Merging layered space-time coding (LST), which provides high data rate transmission with space-time block coding (STBC) provides transmit diversity and improved performance to wireless communication systems. This architecture is known as multilayered space-time coding (MLSTC). In this thesis we propose a decreased complexity minimum mean squared error (MMSE) detector based on the sorted QR decomposition (SQRD), intended for the detection of multi-user STBC systems. The proposed decoder has been proven to enhance the overall performance of the MLSTC architecture. It offers a lower computational complexity than that offered by conventional detectors such as group interference cancellation (GIC) detectors. In addition, the number of receive antennas required to perform detection is smaller than that required by the GIC detector. Further, in order for all groups, which can be viewed as individual users, to benefit from a similar performance, unequal power allocation strategy will be employed to the system. We also concatenate OFDM to the MLSTC scheme in order to combat a frequency selective channel. We then extend this scheme to space-frequency-time (SFT) codes in order to extract the maximum frequency diversity available from the channel. In this thesis, we also propose a new transceiver architecture for multiple-input multiple-output (MIMO) systems. The proposed scheme borrows ideas from the MLSTC and threaded space-time coding (TSTC) schemes in an effort to maximize the diversity order while maintaining a low complexity detection. Specifically, the proposed scheme has a structure similar to that of the MLSTC while it employs a spatial interleaver (SI) in front of the MLSTC encoder. We analyze the proposed scheme where we derive an upper bound on the bit error rate and derive the diversity-multiplexing gain trade-off curve. We present several examples through which we demonstrate the superiority of the proposed scheme over existing schemes.
Space Time Processing For Mimo Communications
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Author : Alex Gershman
language : en
Publisher: John Wiley & Sons
Release Date : 2005-08-05
Space Time Processing For Mimo Communications written by Alex Gershman and has been published by John Wiley & Sons this book supported file pdf, txt, epub, kindle and other format this book has been release on 2005-08-05 with Technology & Engineering categories.
Driven by the desire to boost the quality of service of wireless systems closer to that afforded by wireline systems, space-time processing for multiple-input multiple-output (MIMO) wireless communications research has drawn remarkable interest in recent years. Exciting theoretical advances have been complemented by rapid transition of research results to industry products and services, thus creating a vibrant new area. Space-time processing is a broad area, owing in part to the underlying convergence of information theory, communications and signal processing research that brought it to fruition. This book presents a balanced and timely introduction to space-time processing for MIMO communications, including highlights of emerging trends, such as spatial multiplexing and joint transceiver optimization. Includes detailed coverage of wireless channel sounding, modelling, characterization and model validation. Provides state-of-the-art research results on space-time coding, including comprehensive tutorial coverage of orthogonal space-time block codes. Discusses important recent developments in spatial multiplexing, transmit beam-forming, pre-coding and joint transceiver design for the multi-user MIMO downlink using full or partial CSI. Illustrates all theory with numerous examples gleaned from cutting-edge research from around the globe. This valuable resource will appeal to engineers, developers and consultants involved in the design and implementation of space-time processing for MIMO communications. Its accessible format, amply illustrated with real world case studies, contains relevant, detailed advice for postgraduate students and researchers specializing in this field.
High Rate Space Frequency Codes For Mimo Ofdm Systems
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Author : Cheng Wang
language : en
Publisher:
Release Date : 2010
High Rate Space Frequency Codes For Mimo Ofdm Systems written by Cheng Wang and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2010 with MIMO systems categories.
In the recent years, multiple-input multiple-out (MIMO) technology has attracted lots of attention because it significantly increases the data throughput (multiplexing gain) and link reliability (diversity gain) without additional bandwidth or transmission power. Orthogonal frequency division multiplexing (OFDM) technology has been developed into a popular scheme for wideband digital communications since it is an efficient and effective techniques to deal with frequency-selective fading as well as achieving high speed data transmissions. The combination of the MIMO and OFDM, i.e. MIMO-OFDM system, has been widely recognized as the next generation broadband wireless system. In order to achieve both spatial and frequency diversities in MIMO-OFDM system, space-frequency (SF) codes have been proposed in the literature. In this thesis, we first look into the development of SF codes and various methods to achieve full diversity. Then we briefly describe the full-diversity layered space-time codes and propose an idea of high-rate full diversity space-frequency codes for a multiuser MIMO-OFDM system.
Dissertation Abstracts International
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Author :
language : en
Publisher:
Release Date : 2009
Dissertation Abstracts International written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2009 with Dissertations, Academic categories.
A Layered Space Time Coded Mimo Architecture For High Data Rate Wireless Communications
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Author :
language : en
Publisher:
Release Date :
A Layered Space Time Coded Mimo Architecture For High Data Rate Wireless Communications written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on with categories.
Xii, 88 leaves : ill. ; 30 cm.
Signal Processing Channel Estimation And Link Adaptation In Mimo Ofdm Systems
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Author : Jianjun Ran
language : en
Publisher: Cuvillier Verlag
Release Date : 2008
Signal Processing Channel Estimation And Link Adaptation In Mimo Ofdm Systems written by Jianjun Ran and has been published by Cuvillier Verlag this book supported file pdf, txt, epub, kindle and other format this book has been release on 2008 with categories.
Layered Space Time Architectures For Wireless Mimo Channels
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Author :
language : en
Publisher:
Release Date : 2006
Layered Space Time Architectures For Wireless Mimo Channels written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2006 with categories.
Layered Space Time Architectures For Mimo Wireless Channels
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Author : Ali Farid Raza
language : en
Publisher:
Release Date : 2006
Layered Space Time Architectures For Mimo Wireless Channels written by Ali Farid Raza and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2006 with categories.