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检索条件"主题词=Multiple-input multiple-output"

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Limited Feedback MIMO Precoding via Alternating multiple Differential Codebooks

Limited Feedback MIMO Precoding via Alternating Multiple Dif...

引用

IEEE 11th Malaysia International Conference on Communications (MICC)

作者： Zou, Jun Wang, Michael Yang, Chunliang Hua, Min Yang, Wenjie

ISBN: (纸本)9781479915323

Differential codebook precoding is known as a capacity-achieving precoding scheme when the channel variation is slow. However, at medium to high channel variation speeds the differential codebook optimized for low channel variation speeds performs poorly compared to other precoding schemes, thereby limiting its application to practical systems. In this paper, we apply an alternating codebook technique to differential precoding to improve its robustness to high channel variability. The basic idea is creating multiple (instead of single) differential codebooks optimized for various channel variation speeds, and alternating these codebooks over time providing a virtually larger differential codebook, containing various precoding matrices optimized for different speeds, without the need for additional feedback overhead. Simulation results show that the proposed alternating differential codebook scheme not only retains the superior performance of differential precoding at low channel variation rate but, at the same time, reduces the sensitivity to high speed channel variations, resulting in a more practical precoding scheme.

关键词： multiple-input multiple-output linear precoding limited feedback differential feedback temporal correlation

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Few-mode fiber for optical MIMO transmission with low computational complexity

Few-mode fiber for optical MIMO transmission with low comput...

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Conference on Next-Generation Optical Communication - Components, Sub-Systems, and Systems II

作者： Sakamoto, T. Mori, T. Yamamoto, T. Yamamoto, F. NTT Corp NTT Access Network Serv Syst Labs Tsukuba Ibaraki 3050805 Japan

ISBN: (纸本)9780819494160

This paper introduces our recent results on mode-division multiplexing transmission with MIMO processing. We have been studying coherent optical MIMO transmission systems and developing few-mode fibers to reduce the complexity of MIMO processing, for example, by using multi-step index fibers to control the differential mode delay (DMD) of the fibers and to compensate for the total DMD. We also investigated a transmission system using reduced-complexity MIMO processing. Finally, we review our latest 2x2 WDM-MIMO transmission experiments with low MIMO processing complexity.

关键词： Few-mode fiber multiple-input multiple-output differential mode delay

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Minimum Distance Based Precoding for Closed-Loop QO-STBC Systems with Single-Symbol Decodable ML Receiver

Minimum Distance Based Precoding for Closed-Loop QO-STBC Sys...

引用

IEEE Computing, Communications and IT Applications Conference (IEEE ComComAp)

作者： Kim, Jaesin Ryu, Junghun Kim, Suil Pak, Ui-Young Agcy Def Dev R&D Inst 1 2 Taejon 300600 South Korea

ISBN: (纸本)9781467360449;9781467360432

In this paper, we proposes a new minimum distance based precoding scheme for closed-loop quasi-orthogonal space-time block code (QO-STBC) systems. By utilizing the minimum Euclidean distance maximizing criterion, the proposed scheme attains the near-optimal symbol error performance, while allowing lower feedback overhead. In addition, the proposed scheme still guarantees a simple maximum likelihood detection (called single-symbol decodable). Simulation results verify that our proposed approach provides further gains compared to the conventional closed-loop systems.

关键词： multiple-input multiple-output minimum Euclidean distance closed-loop QO-STBC

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COMPUTING THE DEGREES OF FREEDOM FOR ARBITRARY MIMO INTERFERENCE CHANNELS

COMPUTING THE DEGREES OF FREEDOM FOR ARBITRARY MIMO INTERFER...

引用

IEEE International Conference on Acoustics, Speech, and Signal Processing (ICASSP)

作者： Gonzalez, O. Lameiro, C. Via, J. Beltran, C. Santamaria, I. Univ Cantabria Dept Commun Engn E-39005 Santander Cantabria Spain Univ Cantabria Dept Stat & Computat Math E-39005 Santander Cantabria Spain

ISBN: (纸本)9781479903566

In this paper we provide an efficient procedure to compute the total number of degrees of freedom (DoF), achievable by linear beam-forming, of the K-user multiple-input multiple-output (MIMO) interference channel with an arbitrary number of Tx-Rx antennas at each link. Firstly, we derive an analytical outer bound that generalizes the results that exist for the symmetric K-user M x N interference channel. Secondly, we obtain a tighter bound by solving a convex optimization problem that includes as constraints the DoF characterizations for point-to-point MIMO links and for 2-user interference channels. The solution to this convex problem admits an interesting waterfilling interpretation. Finally, exploiting this outer bound and using a recently proposed feasibility test, we show that it is possible to obtain the DoF for any interference channel in an efficient way. Some simulations results are included to illustrate the tightness of the derived bounds, as well as to study the DoF achievable for the 4-user channel when we distribute the total number of antennas among users and between transmitters and receivers in different ways.

关键词： Degrees of freedom interference alignment multiple-input multiple-output convex optimization

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Implementation of Sphere Decoder with Early Termination using FPGA

Implementation of Sphere Decoder with Early Termination usin...

引用

International Conference on Signal Processing and Communication (ICSC)

作者： Chauhan, Abha Mehra, Rajesh NITTTR Chandigarh India

ISBN: (纸本)9781479916054

Sphere Decoding (SD) algorithm has emerged as a highly effective detection scheme for multiple-input multiple-output (MIMO) systems. It offers a near maximum likelihood accuracy with reduced complexity. Despite this, there is a constant demand of even low complexity SD algorithms. This paper presents the FPGA implementation of Schnorr-Euchner SD algorithm with Early Termination (ET) scheme for uncoded multiple-input multiple output system. The ET scheme reduces the complexity of the decoder. The proposed decoder is designed for 4x4 Binary Phase Shift Keying (BPSK) MIMO system. The trade-off between the Bit Error Rate (BER) performance and the computational complexity is discussed. To compute the computational complexity synthesis of the proposed design is done on Xilinx Virtex 5 XC5VLX30T and Spartan 6 XC6SLX25T. An exhaustive comparison on the basis of resources utilized and frequency (MHz) at which the design can run is done on both the FPGAs.

关键词： Sphere Decoder Maximum likelihood detector multiple-input multiple-output Schnorr-Euchner algorithm Early Termination Field Programmable Gate Array Bit Error Rate

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Performance Analysis of the Imaging Receivers Using a Hemispherical Lens for Visible Light Communications

Performance Analysis of the Imaging Receivers Using a Hemisp...

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International Conference on Wireless Communications and Signal Processing (WCSP)

作者： Li, Baolong Lai, Xiaoquan Wang, Jiaheng Liang, Xiao Zhao, Chunming Southeast Univ Natl Mobile Commun Res Lab Nanjing 210096 Jiangsu Peoples R China

ISBN: (纸本)9781479903085

A hemispherical lens is often used in Visible Light Communication (VLC) systems to provide a wide field of view (FOV) and spatial multiplexing gain. Depending on the way of placing the lens, in practice there are generally two kinds of receivers, namely the flat-surface and curved-surface receivers, where the former one uses the flat surface of lens to collect light from the LED while the latter one uses the curved surface. We first derive the channel gain of the single-input single-output (SISO) VLC system with a finite receiving area, and then compare the channel gains of the two receivers in various scenarios. It is shown that the flat-surface receiver could provide a wider FOV than the curved-surface receiver. We further study the performance of two receivers in multiple-input multiple-output (MIMO) VLC systems. Through the BER performance analysis, we find that high spatial multiplexing gain could be achieved by both receivers if the receiving plane is properly located.

关键词： field of view hemispherical lens spatial multiplexing multiple-input multiple-output visible light communication

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Coding for relay networks with parallel Gaussian channels

Coding for relay networks with parallel Gaussian channels

引用

作者： Huang, Yu-Chih Texas A&M University

学位级别：Ph.D.

A wireless relay network consists of multiple source nodes, multiple destination nodes, and possibly many relay nodes in between to facilitate its transmission. It is clear that the performance of such networks highly depends on information forwarding strategies adopted at the relay nodes. This dissertation studies a particular information forwarding strategy called compute-and-forward. Compute-and-forward is a novel paradigm that tries to incorporate the idea of network coding within the physical layer and hence is often referred to as physical layer network coding. The main idea is to exploit the superposition nature of the wireless medium to directly compute or decode functions of transmitted signals at intermediate relays in a network. Thus, the coding performed at the physical layer serves the purpose of error correction as well as permits recovery of functions of transmitted signals. For the bidirectional relaying problem with Gaussian channels, it has been shown by Wilson et al. and Nam et al. that the compute-and-forward paradigm is asymptotically optimal and achieves the capacity region to within 1 bit; however, similar results beyond the memoryless case are still lacking. This is mainly because channels with memory would destroy the lattice structure that is most crucial for the compute-and-forward paradigm. Hence, how to extend compute-and-forward to such channels has been a challenging issue. This motivates this study of the extension of compute-and-forward to channels with memory, such as inter-symbol interference. The bidirectional relaying problem with parallel Gaussian channels is also studied, which is a relevant model for the Gaussian bidirectional channel with inter-symbol interference and that with multiple-input multiple-output channels. Motivated by the recent success of linear finite-field deterministic model, we first investigate the corresponding deterministic parallel bidirectional relay channel and fully characterize its capacity region. T

关键词： Network information theory wireless relay networks bidirectional relay channels inter-symbol interference multiple-input multiple-output compute-and-forward Thesis

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Channel Parameters Estimation for Multiuser MIMO MC-CDMA Systems

Channel Parameters Estimation for Multiuser MIMO MC-CDMA Sys...

引用

IEEE Pacific Rim Conference on Communications, Computers and Signal Processing (PACRIM)

作者： Chou, You-Ren Ueng, Fang-Biau Chang, Yu-Kuan Natl Chung Hsing Univ Dept Elect Engn Taichung 40227 Taiwan

ISBN: (纸本)9781479915019

This paper investigates the channel estimation method for multiuser multiple inputmultiple output (MIMO) multi-carrier code division multiple access (MC-CDMA) communication systems. For the asynchronous uplink transmission situation, the receiver needs to estimate the channel parameters, including the multi-path gain coefficient, the carrier phase offset and the transmission time delay, to demodulate the received signals. Based on the knowledge of the spreading sequences, the proposed parameter estimation method employs the least mean-squared error (LMSE) criterion to the required parameters for the multiuser MIMO MC-CDMA systems. Some simulation examples for uplink scenario are given to demonstrate the effectiveness of the proposed methods.

关键词： multiple-input multiple-output quasi mean square accuracy coefficient multi-carrier code division multiple access

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Semi-blind Iterative Joint Channel Estimation and K-Best Sphere Decoding for MIMO

Semi-blind Iterative Joint Channel Estimation and K-Best Sph...

引用

IEEE Pacific Rim Conference on Communications, Computers and Signal Processing

作者： I. Dey G. G. Messier S. Magierowski Sheng Chen School of Electrical and Computer Engineering University of Calgary Electronics and Computer Science Faculty of Physical and Applied Sciences University of Southampton

ISBN: (纸本)9781479915002

An efficient and high-performance semi-blind scheme is proposed for multiple-input multiple-output (MIMO) systems by iteratively combining channel estimation with K-Best Sphere Decoding (SD). To avoid the exponentially increasing complexity of Maximum Likelihood Detection (MLD) while achieving a near optimal MLD performance, K-best SD is considered to accomplish data detection. Semi-blind iterative estimation is adopted for identifying the MIMO channel matrix. Specifically, a training-based least squares channel estimate is initially provided to the K-best SD data detector, and the channel estimator and the data detector then iteratively exchange information to perform the decision-directed channel update and consequently to enhance the detection performance. The proposed scheme is capable of approaching the ideal detection performance obtained with the perfect MIMO channel state information.

关键词： multiple-input multiple-output K-Best Sphere Decoding Joint channel estimation and data detection multiple input multiple output systems channel estimation DECODING channel matrix Spheres Iterative Metachromatic Leukodystrophy minimum lethal dose

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CLOSED EXPRESSIONS FOR THE OUTAGE PERFORMANCE OF DISTRIBUTED TRANSMIT-RECEIVE DIVERSITY SYSTEM

CLOSED EXPRESSIONS FOR THE OUTAGE PERFORMANCE OF DISTRIBUTED...

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IET International Conference on Information and Communications Technologies

作者： Lei Li Dong-mei Hu Xiao-dong Wang Information Technology Office Nanhai Fleet Command Naval Force of the PLA Zhanjiang China|c|

ISBN: (纸本)9781629931357

Outage performance of distributed transmit-receive diversity system subjected to composite Rayleigh-Lognormal fading channel is considered. Using random Wishart matrix theory and Gauss-Hermite quadrature, we derived closed form expressions for its outage probability. The theoretical expressions are validated by numerical results. It is show that distributed transmit-receive system promise significant diversity gains over collocated multiple antenna system.

关键词： Distributed antenna system Rayleigh-Lognormal fading multiple-input multiple-output Transmit-Receive Diversity Outage performance

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