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IEEE International Conference on Communications

作者： Jose Flordelis Xiang Gao Ghassan Dahman Fredrik Rusek Ove Edfors Fredrik Tufvesson Dept. of Electrical and Information Technology Lund University

ISBN: (纸本)9781467364300

Fully-synchronous measurements of a massive multi-user multiple-input multiple-output (MU-MIMO) radio propagation channel are presented. We evaluate the ability of a massive MIMO system to spatially separate users located close to each other in line-of-sight (LOS) propagation conditions. The system consists of a base-station (BS) antenna array equipped with 64 dual-polarized antenna elements (128 ports) arranged in a cylindrical configuration, and eight single-antenna users. The users are confined to a five-meter diameter circle and move randomly at pedestrian speeds. The BS antenna array is located on top of a 20 m tall building and has LOS to the users. We examine user separability by studying singular value spread of the MU-MIMO channel matrix for several subsets of BS antenna array ports, along with sum-rate capacity and achievable sum-rates with both zero-forcing and matched-filtering linear precoders. We also analyze the performance of the user with the lowest rate. Finally, a comparison between the performance offered by the massive MIMO system and that of a conventional MU-MIMO system is provided. To the best of our knowledge, this is the first report of fully-synchronous dynamic measurements of a massive MIMO system. Our investigation shows that even users located close to each other in LOS propagation conditions can be spatially separated in a massive MIMO system.

关键词： Multi-user multiple-input multiple-output systems MU-MIMO Massive MIMO Large-scale MIMO MIMO channel measurements Spatial separation Singular value spread Sum-rate capacity Sum-rate linear precoder

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Design of Lattice Reduction Algorithms for linear-Precoded MIMO System

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IEEE WIRELESS COMMUNICATIONS LETTERS 2014年第1期3卷 46-49页

作者： Chen, Chiao-En Sheen, Wern-Ho Natl Chung Cheng Univ Dept Elect Commun Engn Chiayi 621 Taiwan Natl Chung Cheng Univ Dept Commun Engn Chiayi 621 Taiwan

In this letter, the design of lattice reduction (LR) algorithms specialized for improving the performance of a linear-precoded MIMO system is investigated. Conventionally, the lattice reduction algorithm required in such system is performed mostly by either the Lenstra-Lenstra-Lovasz (LLL) or the Seysen's algorithm (SA), which is designed to search for shorter or nearly-orthogonal bases of a lattice. In this letter, we show that additional performance gain can be further obtained by taking the mean-square-error (MSE) of the considered MIMO system into account. The computational complexity and the error rate achieved by the proposed algorithm is quantified and compared with the LLL and SA via numerical simulations.

关键词： MIMO lattice-reduction linear precoder

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General minimum Euclidean distance-based precoder for MIMO wireless systems

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EURASIP JOURNAL ON ADVANCES IN SIGNAL PROCESSING 2013年第1期2013卷 1页

作者： Quoc-Tuong Ngo Berder, Olivier Scalart, Pascal Univ Rennes 1 IRISA Rennes France

In this article, we investigate the linear precoder based on the maximization of the minimum Euclidean distance between two received data vectors. This new precoding matrix is expressed as the product of a power allocation matrix and an input-shaping matrix. The input-shaping matrix is selected as a normalized discrete Fourier transform-matrix, and the optimal power allocation depends on the channel characteristics. For each number of available datastreams, we propose a general form of the optimized precoding matrix. These forms are suitable for different transmit channels and especially for all rectangular quadrature amplitude modulation modulations. We show, in the simulation results, that the proposed precoder provides a significant improvement in terms of bit error rate performance compared to other traditional precoding strategies.t

关键词： MIMO CSIT linear precoder Spatial multiplexing ML receiver Minimum Euclidean distance

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precoder Design for BICM-MIMO Systems Under Channel Estimation Error

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WIRELESS PERSONAL COMMUNICATIONS 2013年第4期72卷 2823-2835页

作者： Andalibi, Zohreh Nguyen, Ha H. Salt, J. Eric Univ Saskatchewan Dept Elect & Comp Engn Saskatoon SK S7N 5A9 Canada TRLabs Saskatoon SK Canada

If properly designed, the use of a linear precoder can achieve the maximum coding gain and diversity order in bit-interleaved coded modulation with multiple-input multiple-output systems. However, such maximum coding gain and diversity order are compromised under the practical scenario of having imperfect channel state information (CSI) at the receiver. To alleviate the impact of imperfect CSI on the coding gain and diversity order, joint linear precoder and training pattern are designed in this paper. The design is carried out by considering both the pairwise error probability and the mean square error of the channel estimator. The effectiveness of the proposed design is illustrated by comparing its performance with the performance obtained when only the training pattern is designed for an precoder optimized under the perfect CSI. In particular, simulation results show that a dB gain is achieved by the proposed design.

关键词： BICM-MIMO Pairwise error probability Diversity order Coding gain linear precoder Pilot symbols Mean-square error Iterative receiver

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Joint linear precoder and power allocation design for uplink MIMO systems with limited feedback

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The Journal of China Universities of Posts and Telecommunications 2009年第3期16卷 14-18页

作者： YAN Zhi WANG Wen-bo WANG Jian-feng ZHENG Kan Key Laboratory of Universal Wireless Communication Ministry of Education Beijing University of Posts and Telecommunications Beijing 100876 China

In this article, the authors consider joint design of a linear precoder and power allocation for uplink multiuser multiple input multiple output （MIMO） communication systems with limited feedback to improve the bit error rate （BER） performance for all users. precoder selection from the codebook set is directly based on the exact BER performance, instead of other suboptimal criteria, to achieve the optimal precoder matrix, but closed-form expressions may not exist in the view of power allocation based directly on the BER criterion. From this perspective, the authors propose the joint transmitter optimization algorithm for the consideration of precoder design, with total power constraint for asymptotic MBER （AMBER） criterion. In this AMBER criterion, a closed-form solution has been derived for power allocation with an optimal precoder. The simulation results show that the proposed joint design algorithm can achieve a much better performance than precoding with uniform power allocation and only consideration of power allocation.

关键词： MIMO linear precoder power allocation spatial multiplexing multiuser

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Statistical Transceiver Designs with ICI Reduction for MIMO-OFDM Systems

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WIRELESS PERSONAL COMMUNICATIONS 2013年第2期71卷 821-837页

作者： Qian, Fengyong Leung, Shuhung Mai, Ruikai Zhu, Yuesheng City Univ Hong Kong Dept Elect Engn Kowloon Hong Kong Peoples R China Peking Univ Shenzhen Grad Sch Commun & Informat Secur Lab Shenzhen Peoples R China

In this paper, transceiver designs that take into account inter-carrier interferences (ICI) in the framework of game theory for multiple-input multiple-output orthogonal frequency division multiplexing systems are presented. With statistical channel state information at the transmitter, two transceivers: minimal mean-squared-error equalizer and minimal mean-squared-error decision-feedback equalizer are designed. The transceiver designs with the objective of minimizing the expectation of detection mean squared error become a complicated strategic non-cooperative game problem. In the paper, heuristic algorithms based on the best reply dynamic in game theory are proposed, whose convergence to Nash equilibrium can be numerically verified. Compared with traditional transceivers which ignore ICI effect by assuming perfect orthogonality between subcarriers, our designs require a moderate increase in design complexity. Nevertheless, the proposed transceivers have the same implementation complexity as the traditional counterparts. Numerical results verify that the proposed transceivers are more robust to ICI effect from the perspective of bit error rate than the traditional ones.

关键词： Time-varying impairments Inter-carrier interference (ICI) linear precoder Strategic non-cooperative game Best replay dynamic Heuristic algorithms

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Minimum Euclidean Distance-Based Precoding for Three-Dimensional Multiple Input Multiple Output Spatial Multiplexing Systems

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IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS 2012年第7期11卷 2486-2495页

作者： Ngo, Quoc-Tuong Berder, Olivier Scalart, Pascal Univ Rennes 1 ENSSAT IRISA Equipe Rech CAIRN F-22305 Lannion France

Through a feedback link, the channel state information acquired at the receiver is known at the transmitter and MIMO precoding techniques can be applied according to various criteria. In this paper, an efficient linear precoder based on the maximization of the minimum Euclidean distance between two received data vectors for three data-stream MIMO spatial multiplexing systems is proposed. By using a singular value decomposition, the precoding matrix can be parameterized as the product of a power allocation matrix and an input shaper matrix. According to this representation, the optimal precoders are proposed for the case of three independent data-streams. Simulation results over Rayleigh fading channels show considerable bit-error-rate improvement with the proposed solution in comparison with other precoding strategies.

关键词： MIMO CSI linear precoder spatial multiplexing ML receiver minimum Euclidean distance

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A Low-Complexity Design of linear Precoding for MIMO Channels with Finite-Alphabet Inputs

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IEEE WIRELESS COMMUNICATIONS LETTERS 2012年第1期1卷 38-41页

作者： Zeng, Weiliang Xiao, Chengshan Lu, Jianhua Tsinghua Univ Dept Elect Engn Beijing 100084 Peoples R China Missouri Univ Sci & Technol Dept Elect & Comp Engn Rolla MO 65409 USA

This paper investigates linear precoding scheme that maximizes mutual information for multiple-input multiple-output (MIMO) channels with finite-alphabet inputs. In contrast with recent studies, optimizing mutual information directly with extensive computational burden, this work proposes a low-complexity and high-performance design. It derives a lower bound that demands low computational effort and approximates, with a constant shift, the mutual information for various settings. Based on this bound, the precoding problem is solved efficiently. Numerical examples show the efficacy of this method for constant and fading MIMO channels. Compared to its conventional counterparts, the proposed method reduces the computational complexity without performance loss.

关键词： linear precoder finite-alphabet inputs mutual information maximization low-complexity design

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MMSE-Based precoders for Cooperative MIMO Systems with Direct Link

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IEICE TRANSACTIONS ON COMMUNICATIONS 2012年第9期E95B卷 2999-3002页

作者： Yoo, Byungwook Lee, Chungyong Yonsei Univ Dept Elect & Elect Eng Seoul 120749 South Korea

We propose linear precoders which jointly minimize the mean-squared error of estimated symbol at the destination node for cooperative multiple-input multiple-output communication systems. Unlike the existing precoders which require high computational complexity to solve the optimization problem on the direct link, the proposed precoder is expressed in a closed-form. Simulation results show that the proposed precoder outperforms the existing precoders in the low SNR region. Moreover, we observe that the proposed iterative algorithm is not sensitive to the initial matrices.

关键词： cooperative MIMO systems linear precoder MMSE direct link CSI

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Minimum Euclidean Distance Based precoders for MIMO Systems Using Rectangular QAM Modulations

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IEEE TRANSACTIONS ON SIGNAL PROCESSING 2012年第3期60卷 1527-1533页

作者： Quoc-Tuong Ngo Berder, Olivier Scalart, Pascal Univ Rennes 1 IRISA F-22305 Lannion France

From the feedback of the channel state information (CSI), precoding techniques improve the performance of multiple-input multiple-output (MIMO) systems by optimizing various criteria. In this correspondence, an efficient precoder that maximizes the minimum distance (d(min)) of two received vectors is studied. This criterion leads to a nondiagonal precoding scheme and allows achieving a full diversity order. However, the optimized solution for MIMO systems using a high-order QAM modulation is rather complex and changes for different constellations. Therefore, we propose herein a general form of minimum Euclidean distance based precoders for all rectangular QAM modulations. It is shown that the new solution optimizes the distance d(min) for small and large dispersive channels.

关键词： Channel state information (CSI) linear precoder minimum Euclidean distance multiple input multiple output (MIMO) ML receiver spatial multiplexing

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