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

共 889 条记录，以下是701-710 订阅

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Eigenmode Decoupling Technique Exploiting Symmetric Antenna Arrangement

Eigenmode Decoupling Technique Exploiting Symmetric Antenna ...

引用

International Conference on Advanced Technologies for Communications (ATC)

作者： Murata, Kentaro Honma, Naoki Iwate Univ Grad Sch Engn Morioka Iwate 0208551 Japan

ISBN: (纸本)9781479910861;9781479910885

In this paper a novel decoupling method using eigenmode derived from S-parameter is proposed. Eigen beam forming toward a degenerated eigenmode of a mutual coupling channel allows one antenna group to be isolated from the other spatially, which results in decoupling over a wide range of frequencies. Moreover, due to symmetric antenna arrangement, the proposed method can isolate one antenna group from many more antennas.

关键词： multiple-input multiple-output decoupling and matching network

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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 (PACRIM)

作者： Dey, I. Messier, G. G. Magierowski, S. Chen, Sheng Univ Calgary Sch Elect & Comp Engn Calgary AB Canada Univ Southampton Fac Phys & Appl Sci Elect & Comp Sci Southampton Hants England

ISBN: (纸本)9781479915019

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

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MIMO Downlink Communication Employing Multi-user Transmitter Pre-processing Based on Vector Quantized Channel Spatial Information: Performance Results

MIMO Downlink Communication Employing Multi-user Transmitter...

引用

2nd IEEE International Conference on Communications and Signal Processing (ICCSP)

作者： Nagaradjane, Prabagarane Swaminathan, Shriram Krishnan, Suraj Damodaran, Selvam Paranche Swaminathan, Arun SSN Inst Dept ECE Madras Tamil Nadu India

ISBN: (纸本)9781467348669;9781467348652

In this letter, we report the performance of multi-user transmitter pre-processing (MUTP) assisted multiple-input multiple-output downlink (DL) communication, when the channel state information (CSI) required to formulate the preprocessing matrix is estimated at the receiver and fed back to the base station (BS) through feedback channels that experience noise. In particular, in our work the CSIs are estimated at the mobile stations (MSs) and the estimated CSIs (ECSIs) are decomposed by invoking singular value decomposition. The signal space of right-hand side unitary matrix of the decomposed ECSI associated with each of the MSs is then vector quantized and the magnitudes and phases are communicated to the BS as channel spatial information through noisy feedback channels. This vector quantized channel spatial information which is tainted by noise is recovered by employing minimum mean square error based linear detector. The recovered spatial information is then utilized to conceive the pre-processing matrix to deal with the DL multi-user interference (MUI). Our study shows that, MUTP realized with perfect CSI at the BS is capable of completely eliminating the MUI. However, vector quantized channel spatial information based MUTP results in imperfect removal of MUI, as the quantization errors and feedback channel induced errors play a principal role in determining its performance in the context of interference removal. Albeit the achievable symbol error rate (SER) slightly degrades compared to the perfect CSI case, we advocate that vector quantization seems to be an efficient approach in quantizing the necessary spatial information and feeding them back to the BS for the purpose of formulating the pre-processing matrix particularly in frequency division duplex aided wireless systems.

关键词： Channel spatial information perfect CSI minimum mean square error multi-antenna interference multi-user interference multiple-input multiple-output singular value decomposition vector quantization

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Analysis of QR Decomposition for MIMO Systems

Analysis of QR Decomposition for MIMO Systems

引用

International Conference on Electronic Systems, Signal Processing and Computing

作者： Abha Chauhan Rajesh Mehra ME Student ECE Department NITTTR Chandigarh India Associate Professor ECE Department NITTTR Chandigarh India

ISBN: (纸本)9781479921041

Sphere Decoder (SD) is widely being used in multiple input multiple output (MIMO) systems to reduce the complexity of the system while obtaining near Maximum Likelihood (ML) performance. The complexity of the system increases with the increase in antenna configuration or the constellation size. Some pre-processing is a fundamental prerequisite in iterative detectors to reduce the system complexity by focusing the received signal energy to reduce the effect of inter-symbol interference. The QR Decomposition (QRD) of communication channel matrices in the pre-processor stage is an important issue to ensure good performance of the subsequent steps of decoding thus a QRD) is commonly used in many MIMO detection algorithms. A sorted QR decomposition (SQRD) is an advanced algorithm that improves the performance of MIMO detection. In this paper the efficiency of QRD and SQRD methods in terms of computational complexity, error rate performance and the FPGA resources utilized is presented. The main contribution of this work is a comparison of hardware implementations of the QRD and SQRD system. QRD for 4x4 MIMO system is implemented on various target FPGA platforms to compare their area utilization.

关键词： Sphere Decoder Maximum likelihood detector multiple-input multiple-output Pre-Processor QR decomposition Sorted QR decomposition Field Programmable Gate Array Bit Error Rate

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A Novel Algorithm for MIMO Signal Classification Using Higher-Order Cumulants

A Novel Algorithm for MIMO Signal Classification Using Highe...

引用

IEEE Radio and Wireless Symposium (RWS)

作者： Muehlhaus, Michael S. Oner, Menguc Dobre, Octavia A. Jaekel, Holger U. Jondral, Friedrich K. Karlsruhe Inst Technol D-76021 Karlsruhe Germany Isik Univ Sile Turkey Memorial Univ St John NF Canada

ISBN: (纸本)9781467329323;9781467329293

Automatic modulation classification (AMC) of unknown communications signals is employed in both commercial and military applications, such as cognitive radio, spectrum surveillance, and electronic warfare. Most of the AMC methods proposed in the literature are developed for systems with a single transmit antenna. In this paper, an AMC algorithm for multiple-input multiple-output (MIMO) signals is proposed, which is based on higher-order cumulants. The use of cumulants with different orders, as well as their combinations as feature vectors are investigated. The ideal case of a priori knowledge of the channel state information (CSI) is considered, along with a setting of practical relevance, where the channel matrix is blindly estimated through independent component analysis. The performance of the proposed algorithm with different features is evaluated through simulations and compared with that of the average likelihood ratio test (ALRT).

关键词： Automatic modulation classification multiple-input multiple-output independent component analysis blind source separation higher-order cumulants

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Few-mode Fiber Transmission with Inline Few-Mode Erbium-Doped Fiber Amplifier

Few-mode Fiber Transmission with Inline Few-Mode Erbium-Dope...

引用

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

作者： Ip, Ezra Li, Ming-Jun Bennett, Kevin Bickham, Scott Huang, Yue-Kai Tanaka, Akihiro Mateo, Eduardo Hu, Junqiang Wang, Ting Korolev, Andrey Koreshkov, Konstantin Wood, William Linares, Jesus Montero, Carlos Moreno, Vincente Prieto, Xesus Yano, Yutaka Aono, Yoshiaki Tajima, Tsutomo Fukuchi, Kiyoshi NEC Labs Amer 4 Independence Way Princeton NJ 08540 USA Corning Inc Corning NY 14831 USA Univ Santiago de Compostela Santiago De Compostela Spain NEC Corp Ltd Tokyo Japan

ISBN: (纸本)9780819494160

We demonstrate wavelength-division multiplexed (WDM) and mode-division multiplexed (MDM) transmission over a fiber recirculating loop comprising of a 25-km span of low differential mode group dispersion (DMGD) few-mode fiber carrying the LP01 and LP11 mode groups, and an inline few-mode erbium-doped fiber amplifier (FM-EDFA) providing low mode-dependent gain (MDG) per span. We successfully transmitted a 10 lambda x 6 x 28-Gbaud QPSK signal over a distance of 700 km.

关键词： Space-division multiplexing mode-multiplexing few-mode fiber multiple-input multiple-output erbium-doped fiber amplifier recirculating loop wavelength-division multiplexing

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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...

引用

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...

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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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