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IEEE Global Communications Conference

作者： Shriram Swaminathan Gordon L. Stuber School of Electrical and Computer Engineering Georgia Institute of Technology

ISBN: (纸本)9781467309202

Conventional uni-polarized multiple input multiple output (MIMO) antenna systems offer the advantages of higher data rate and higher reliability through the use of spatial multiplexing and space-time coding, respectively. However, the cost and space constraints have led to the use of dual-polarized MIMO antenna systems where two spatially separated uni-polarized antennas are replaced by a single antenna element employing orthogonal polarizations, thereby exploiting polarization diversity. The advantages of dual polarized antennas can be further exploited by the use of precoding at the transmitter which leads to reduced complexity at the receiver for downlink communications, when compared to the conventional multi-user detectors. In this paper, we propose a singular value decomposition based precoding-aided dual-polarized MIMO system and compare its performance with the conventional minimum mean square error (MMSE) based approach for mitigating co-channel interference in a multi-cell environment consisting of flat Rayleigh fading channels. Our performance results reveal that the precoding-aided dual-polarized MIMO system outperforms the conventional MMSE detection scheme and offers appreciable gain in symbol energy-to-noise ratio performance.

关键词： Multiple input multiple output space time block codes Spatial multiplexing Polarization diversity Precoding Co-channel interference multiple input multiple output systems prediction coding polarization diversity space division multiplexing Cochannel interference space time block coding antenna element ANTENNA SYSTEM

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Fourth-order Moment-based Identification of SM and Alamouti STBC for Cognitive Radio

Fourth-order Moment-based Identification of SM and Alamouti ...

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IEEE International Conference on Communications

作者： Yahia A. Eldemerdash Octavia A. Dobre Mohamed Marey Robert Inkol Faculty of Engineering and Applied Science Memorial University of Newfoundland Defence Research and Development Canada

ISBN: (纸本)9781457720529

Cognitive radio (CR) systems require knowledge of the signal environment if they are to coexist with the primary (incumbent) users of the radio spectrum. Consequently, signal identification is a major task of a CR. This paper proposes a novel identification algorithm for spatial multiplexing (SM) and Alamouti space-time block code (AL STBC) transmissions, when the CR employs a single receive antenna. This algorithm relies on the fourth-order moment as a discriminating signal feature and uses a maximum likelihood (ML) criterion for decision making. Its performance is investigated through theoretical analysis and simulation experiments.

关键词： Cognitive radio Signal identification Spatial multiplexing Alamouti space-time block code Cognitive radio Signal environment Samarium space time block coding signal recognition chromium Theoretical analysis

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Cyclostationarity-Based Blind Classification of STBCs for Cognitive Radio Systems

Cyclostationarity-Based Blind Classification of STBCs for Co...

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IEEE International Conference on Communications

作者： Mohamed Marey Octavia Dobre Robert Inkol Faculty of Engineering and Applied Science Memorial University of Newfoundland Defence Research and Development Canada

ISBN: (纸本)9781457720529

Signal classification is a major task of a cognitive radio. This paper proposes a novel cyclostationarity-based algorithm for the blind classification of space time block codes (STBCs) and derives analytical expressions for the second-order cyclic statistics used as the basis of the algorithm. Monte Carlo simulation results demonstrate a good classification performance with low sensitivity to phase noise and the channel Doppler shift. The proposed approach avoids the need for a priori knowledge of the channel coefficients, carrier phase, and timing offsets. Moreover, it does not need accurate information about the transmission data rate and carrier frequency offset.

关键词： Signal intelligence and cognitive radio Signal cyclostationarity Signal classification Multiple antenna systems Radio systems Data transfer rates Cognitive radio space time block coding Blind signal classification carrier frequency offset Phase noise low sensitivity Channel Coefficient

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space-time block coding for uplink single-carrier CDMA with joint detection in the frequency domain

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IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS 2007年第6期6卷 2096-2105页

作者： Horlin, Francois Lopez-Estraviz, Eduardo Van der Perre, Liesbet Interuniv Microelect Ctr B-3001 Louvain Belgium

Single-carrier code-division multiple access (SC-CDMA), also named cyclic-prefix CDMA in the literature, is a promising air interface for the uplink of the 4G cellular wireless communication systems. It enables the high capacity intrinsically offered by CDMA by making the equalization of the multipath channels and the mitigation of the resulting interference possible at a low complexity. This paper proposes a new air interface that combines SC-CDMA with space-time block coding (STBC) across multiple transmit antennas in order to make the link more robust. Contrary to existing air interfaces that perform the STBC at the chip level, making them only applicable to the downlink, the STBC is performed at the symbol level, making it also applicable to the uplink. In order to optimally detect the different antenna and user signals, a linear joint detector optimized according to the minimum mean square error (MMSE) criterion is designed. By exploiting the cyclic properties of the channel matrices, the complexity of the joint detector is significantly reduced. Furthermore, it is shown analytically that the inter-antenna interference is canceled out at the output of the first stage of the linear MMSE joint detector, consisting of a matched filter. By space-time coding the signal through two antennas at each transmit mobile terminal, a significant gain in signal-to-noise-ratio can be achieved. However, the spatial diversity gain of the proposed system is limited by the multiuser interference (MUI), that is increasing with the user load. Higher complexity non-linear receivers are needed to better compensate the MUI and still benefit from the spatial diversity,at high user loads.

关键词： single-carrier with cyclic prefix code division multiple access cyclic-prefix code-division multiple access space time block coding joint detection frequency domain equalizer

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Sub-optimum detection scheme for asynchronous cooperative relay networks

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IET COMMUNICATIONS 2011年第15期5卷 2250-2255页

作者： Elazreg, A. M. Chambers, J. A. Univ Loughborough Adv Signal Proc Grp Dept Elect & Elect Engn Loughborough LE11 3TU Leics England

In this study, a new sub-optimum detection scheme is proposed which employs closed-loop extended orthogonal space-time block coding and outer convolutive coding within an asynchronous cooperative wireless relay network to achieve full data rate and full diversity gain between the relays and destination node together with coding gain. Simulation results confirm that the proposed scheme can effectively suppress intersymbol interference induced by asynchronism between the relay nodes at the destination node.

关键词： relay Scheme Relay networks Asynchronous optimum detection Trunk Node space time block coding Diversity methods intersymbolic interference destination

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Mobile Multi-Input Multi-Output Underwater Acoustic Communications

Mobile Multi-Input Multi-Output Underwater Acoustic Communic...

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IEEE OCEANS Conference

作者： Zhao, Kexin Ling, Jun Li, Jian Univ Florida Dept Elect & Comp Engn Gainesville FL 32610 USA

ISBN: (纸本)9781457700866

This paper focuses on mobile multi-input multioutput (MIMO) underwater acoustic communications (UAC) over double-selective channels suffering from both inter-symbol interference and Doppler scaling effects (stretching or compression). Temporal resampling is implemented to effectively convert the Doppler scaling effects to Doppler frequency shifts. Then an extension of the sparse learning via iterative minimization (SLIM) algorithm, referred to as generalization of SLIM (GoSLIM), is used to estimate the frequency modulated acoustic channels. Because GoSLIM is user parameter free, it is easy to use in practical applications. We also consider channel equalization and symbol detection for various MIMO transmission schemes, including both space-time block coding and spatial multiplexing. The effectiveness of the proposed mobile MIMO UAC schemes is demonstrated using recently acquired in-water experimental measurements.

关键词： underwater acoustic communication Doppler frequency multi-input space time block coding channel equalization intersymbolic interference UAC Mobile selective channel Sound channels

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Channel Estimation and Tracking for Closed Loop EO-STBC with Differentially Encoding Feedback

Channel Estimation and Tracking for Closed Loop EO-STBC with...

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IEEE International Symposium on Signal Processing and Information Technology (ISSPIT)

作者： Hussin, Mohamed Nuri Weiss, Stephan Univ Strathclyde Ctr Excellence Signal & Image Proc Dept EEE Glasgow Lanark Scotland

ISBN: (纸本)9781467307536

Extended orthogonal space time block coding (EO-STBC) can achieve high transmit diversity over a multiple-input multiple-output (MIMO) channel. To do so, it requires channel state information on the transmitter side, which needs to be estimated and fed back from the receiver. Therefore, this paper explores an estimation and tracking scheme by means of a Kalman filter, which is integrated with EO-STBC detection and exploits the smooth evolution of the channel coefficients by applying differential feedback. For slow fading, we propose the inclusion of a drift vector in the Kalman model, which is motivated by a second order approximation of the underlying channel model and can be shown to offer advantages in terms of temporal smoothness when addressing channels whose coefficient trajectories evolve smoothly.

关键词： Feedback channel estimation Channel Coefficient space time block coding tracking slow fading Kalman filters diversity reception channel model Channel state information Loops Contraceptive Coil

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A Near-Optimum Multiuser Receiver for STBC MC-CDMA Systems Based on Minimum Conditional BER Criterion and Genetic Algorithm-Assisted Channel Estimation

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EURASIP JOURNAL ON WIRELESS COMMUNICATIONS AND NETWORKING 2011年第unknown期2011卷 351494-351494页

作者： D'Orazio, Leandro Sacchi, Claudio Donelli, Massimo Louveaux, Jerome Vandendorpe, Luc Univ Trento Informat Engn & Comp Sci Dept DISI I-38123 Trento Italy Ctr Ric FIAT CRF Trento Branch I-38123 Trento Italy Catholic Univ Louvain Lab Telecommun & Teledetect B-1348 Louvain Belgium

The implementation of efficient baseband receivers characterized by affordable computational load is a crucial point in the development of transmission systems exploiting diversity in different domains. This would be a crucial point in the future development of 4G systems, where space, time, and frequency diversity will be combined together in order to increase system throughput. In this framework, a linear multiuser detector for MC-CDMA systems with Alamouti's space-time block coding (STBC), which is inspired by the concept of Minimum Conditional Bit Error Rate (MCBER), is proposed. The MCBER combiner has been implemented in adaptive way by using Least-Mean-Square (LMS) optimization. The estimation of Channel State Information (CSI), necessary to make practically feasible the MCBER detection, is aided by a Genetic Algorithm (GA). The obtained receiver scheme is near-optimal, as both LMS-based MCBER and GA-assisted channel estimation perform closely to optimum in fulfilling their respective tasks. Simulation results evidenced that the proposed receiver always outperforms state-of-the-art receiver schemes based on EGC and MMSE criterion exploiting the same degree of channel knowledge.

关键词： Multicarrier code division multiple access Transmission systems Receivers channel estimation Frequency diversity Conditional space time block coding multiuser receiver CDMA mobile communications

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Relationships between Diversity Techniques and Channel coding Rates for OFDM Systems

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IEICE TRANSACTIONS ON COMMUNICATIONS 2010年第1期E93B卷 195-197页

作者： Rim, Minjoong Dongguk Univ Dept Informat & Commun Engn Seoul South Korea

This paper addresses the relationships between diversity techniques and channel coding rates for OFDM systems. While a low channel coding rates is required if cyclic delay diversity is applied, the necessity of a low ... 详细信息

关键词： OFDM channel coding rate diversity space time block coding cyclic delay diversity

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Performance Analysis of Distributed Transmission Schemes in Cooperative Random Networks

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IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS 2010年第4期9卷 1390-1401页

作者： Kurniawan, Ernest Madhukumar, A. S. Chin, Francois Agcy Sci Technol & Res Modulat & Coding Dept Inst Infocomm Res Singapore 138632 Singapore Nanyang Technol Univ Ctr Multimedia & Network Technol Sch Comp Engn Singapore 639798 Singapore

In this paper, two distributed transmission schemes, namely Distributed Transmitter Maximal Ratio Combining (D-TxMRC) and Distributed space time block coding (D-STBC) are analysed. The array and diversity gain inherent to the underlying Multiple Input Multiple Output (MIMO) technique are studied, both under independent and correlated fading scenario. It is shown that D-TxMRC is capable of achieving high array gain at the expense of complexity, while only limited array gain is attained using D-STBC scheme. As far as diversity gain is concerned, both schemes achieve full diversity in the order of total number of cooperating nodes under independent fading. The overall performance of the schemes under random network scenario is analysed using average outage probability as a performance metric. The averaging encompasses channel variation as well as network dependent parameters. Effects of different network parameters towards system performance are also analysed. Finally, the performance of cooperative schemes in a more practical network with regular node placements are also studied.

关键词： Maximum ratio combining space time block coding random ad-hoc network outage probability

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