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

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PARTICLE SWARM OPTIMISATION AIDED SEMI-BLIND JOINT MAXIMUM LIKELIHOOD CHANNEL ESTIMATION AND DATA DETECTION FOR MIMO SYSTEMS

PARTICLE SWARM OPTIMISATION AIDED SEMI-BLIND JOINT MAXIMUM L...

引用

15th IEEE/SP Workshop on Statistical Signal Processing

作者： Palally, H. R. Chen, S. Yao, W. Hanzo, L. Univ Southampton Sch Elect & Comp Sci Southampton SO17 1BJ Hants England

ISBN: (纸本)9781424427093

A novel scheme of semi-blind joint maximum likelihood (ML) channel estimation and data detection is proposed for multiple-input multiple-output (MIMO) systems by decomposing the joint ML optimisation over channel and data into an iterative two-level optimisation loop. Particle swarm optimisation (PSO) is invoked at the upper level to identify the unknown MIMO channel while an enhanced ML sphere detector is used at the lower level to detect the transmitted data. The scheme is semi-blind as a minimum pilot overhead is employed to aid the initialisation of the PSO based channel estimator.

关键词： multiple-input multiple-output joint maximum likelihood estimation particle swarm optimisation

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Development of a DSP&FPGA Based Real Time MIMO Prototyping Testbed

Development of a DSP&FPGA Based Real Time MIMO Prototyping T...

引用

5th International Conference on Wireless Communications, Networking and Mobile Computing

作者： Sun, Jian Wei, Lixiang Du, Xu Yuan, Dongfeng Shandong Univ Wireless Mobile Commun & Transmiss Lab WMCT Jinan 250100 Shandong Peoples R China

ISBN: (纸本)9781424436927

In this paper we describe a multiple-input multiple-output (MIMO) communication testbed, in which real-time signal processing is achieved with the help of Sundance's digital signal processing platform including TI DSP modules, XINLINX FPGA modules and A/D & D/A modules. As an advanced wireless communication system, the presented MIMO testbed not only provides a real communication link for theoretical researchers to evaluate the key techniques and design their algorithms, but also achieves a comprehensive, open and systemic application testbed with short development time and flexible reconfiguration.

关键词： multiple-input multiple-output testbed real time modularization

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Recent Advances Using Homogeneous Single-Mode Multicore Fibers for Spatial Division multiplexing 20

Recent Advances Using Homogeneous Single-Mode Multicore Fibe...

引用

20th International Conference on Transparent Optical Networks (ICTON)

作者： Luis, Ruben S. Rademacher, Georg Puttnam, Benjamin J. Awaji, Yoshinari Wada, Naoya Natl Inst Informat & Commun Technol Photon Network Syst Lab 4-2-1 Nukui Kitamachi Koganei Tokyo Japan

ISBN: (纸本)9781538666050

We revise the latest advancements on the use of homogeneous single-mode multicore fibers for long distance and/or ultra-high capacity spatial-division multiplexing transmission systems. Also, we review the limitations imposed by inter-core crosstalk on these systems as well as techniques to overcome them, such as high-order multiple input-multiple output mechanisms.

关键词： spatial division multiplexing SDM multi-core fiber MCF multiple-input multiple-output MIMO

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Application of cooperative diversity in 802.11a ad-hoc networks

Application of cooperative diversity in 802.11a ad-hoc netwo...

引用

16th International Conference on Computer Communications and Networks

作者： Zhao, Zhipeng Belfiore, Jean-Claude Ecole Natl Super Telecommun Bretagne Dept Commun & Elect 46 Rue Barrault F-75013 Paris France Ecole Nat Sup Telecom F-75013 Paris France COMSIS SAS F-75014 Paris France

ISBN: (纸本)9781424412501

In this paper, we propose an application of cooperative system in the ad-hoc network. Based on 802.11a PHY, a compatible physical layer protocol Relay-SISO is introduced for the single-relay single-antenna system. Using Non-orthogonal Amplify-and-Forward scheme, the proposed protocol boosts quality of transmission while works at the same data rate as 802.11a with little additional preambles. Simulation results reveal the feasibility of such cooperative scheme and a significant coding gain is observed at data rate 12Mbps.

关键词： cooperative diversity non-orthogonal amplify and forward multiple-input multiple-output space-time block code diversity-multiplexing tradeoff

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Cooperative Diversity in Coded CDMA Systems over Frequency-Selective Fading Channels

Cooperative Diversity in Coded CDMA Systems over Frequency-S...

引用

IEEE International Conference on Communications (ICC)

作者： Eid, Amr Hamouda, Walaa Dayoub, Iyad Concordia Univ Dept Elect & Comp Engn Montreal PQ H3G 1M8 Canada Univ Valenciennes IEMN DOAE F-59313 Valenciennes France

ISBN: (纸本)9781612842332

We investigate the performance of cooperative diversity when employed in convolutionally coded direct-sequence code-division multiple-access (DS-CDMA) systems over frequency-selective fading channels. The performance of the coded system is evaluated through bit error rate upper bounds and compared with simulations. In our analysis, we obtain closed form expressions for the bit error rate upper bounds for multi-relay cooperative systems employing multiuser detection at both the relay and base station receivers. We show that the full benefits of cooperative diversity cannot be achieved if no interference suppression is employed at both the cooperative user and base station receiver. Both simulation and analytical results are presented to validate and demonstrate the performance gain with different system parameters.

关键词： multiple-input multiple-output transmit diversity direct-sequence code-division multiple access fading channels multiuser receivers

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Image reconstruction and compressive sensing in MIMO radar

Image reconstruction and compressive sensing in MIMO radar

引用

Conference on Radar Sensor Technology XVIII

作者： Sun, Bing Lopez, Juan Qiao, Zhijun Univ Texas Pan Amer Dept Math 1201 West Univ Dr Edinburg TX 78539 USA Beihang Univ Sch Elect & Informat Engn Beijing 100191 Peoples R China Univ Texas Pan Amer Dept Math Edinburg TX 78539 USA

ISBN: (纸本)9781628410143

multiple-input multiple-output (MIMO) radar utilizes the flexible configuration of transmitting and receiving antennas to construct images of target scenes. Because of the target scenes' sparsity, the compressive sensing (CS) technique can be used to realize a feasible reconstruction of the target scenes from undersampling data. This paper presents the signal model of MIMO radar and derive the corresponding CS measurement matrix, which shows success of the CS technique. Also the basis pursuit method and total-variation minimization method are adopted for different scenes' recovery. Numerical simulations are provided to illustrate the validity of reconstruction for one dimensional and two dimensional scenes.

关键词： multiple-input multiple-output compressive sensing basis pursuit total-variation minimization

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MIMO Maximum Likelihood Soft Demodulation Based on Dimension Reduction

MIMO Maximum Likelihood Soft Demodulation Based on Dimension...

引用

IEEE Global Telecommunications Conference (GLOBECOM 2010)

作者： Lee, Jungwon Choi, Ji-Woong Lou, Hui-Ling Samsung Elect Mobile Solut Lab 4921 Directors Pl San Diego CA 92121 USA Marvell Semicond Inc Santa Clara CA USA

ISBN: (纸本)9781424456383

This paper proposes a dimension reduction maximum likelihood (ML) soft demodulator for multiple-input multiple-output (MIMO) system. The proposed dimension reduction soft demodulator reduces the dimension of the search space for minimum Euclidean distance calculation by exploiting ML hard detection algorithms and can achieve significantly lower complexity than existing optimal soft demodulators based on exhaustive or near-exhaustive search. The dimension reduction can be realized through the use of optimum MIMO hard detectors such as a sphere decoder, resulting in optimal performance. It can also be implemented using suboptimum low-complexity MIMO hard detectors such as various conventional MIMO equalizers, further reducing the complexity with slight performance degradation.

关键词： MIMO communication MIMO equalizers MIMO maximum likelihood soft demodulation ML hard detection algorithms demodulation dimension reduction soft demodulator maximum likelihood detection minimum Euclidean distance calculation multiple-input multiple-output

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Characterizing spatial correlation in indoor channels

Characterizing spatial correlation in indoor channels

引用

IEEE Wireless Communications and Networking Conference

作者： Denis, M Vasudevan, V Chandra, K Thompson, C Univ Massachusetts Ctr Adv Computat & Telecommun Lowell MA 01854 USA

ISBN: (纸本)0780383443

The spatial correlation features of channel impulse responses for an indoor environment are presented. The wide-hand impulse responses of a rectangular enclosure are calculated using the method of images. Bandpass representations of the non line-of-sight multipath responses are obtained for 2.4 GHz ISM band and their spatial cross correlation estimated for various positions of the transmitter and receiver arrays. The receiver and transmitter correlations are shown to exhibit periodic features and a spatial dependence in the decay rate. The correlation minima decreases with transmitter-receiver (T-R) separation and peak-to-peak correlation amplitude exhibits larger values when the transmitter and receivers are positioned close to the corners of the room. The oscillatory features in the spatial correlation may he attributed to the distribution of multipath clusters in time. For certain configurations of the T-R arrays the clusters are well separated resulting in a slower rate of oscillation at the inter-cluster time scale. In the short or intra-cluster time-scale, the correlation can exhibit a slow decay rate. At the corners, these clusters appear at faster rate and individual clusters are of a shorter duration. This feature leads to a faster and more structured oscillation in the correlation features. These observations are important considerations in design and evaluation of the performance of multiple-output multiple-input wireless communications systems.

关键词： correlation theory indoor radio transient response multipath channels transmitting antennas receiving antennas MIMO systems antenna arrays diversity reception spatial cross correlation indoor channels wide-band impulse responses bandpass representations nonline-of-sight multipath responses ISM band transmitter-receiver arrays peak-to-peak correlation amplitude intracluster time-scale multiple-input multiple-output wireless communications systems temporal diversity 2.4 GHz

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An Overview of Spatial Modulation Techniques for Millimeter Wave MIMO Systems 4

An Overview of Spatial Modulation Techniques for Millimeter ...

引用

4th International Conference on Engineering and Telecommunication (EnT)

作者： Wang, Jintao He, Longzhuang Song, Jian Tsinghua Univ Dept Elect Engn Beijing 100084 Peoples R China Sci & Technol Commun Networks Lab Beijing 100084 Peoples R China

ISBN: (纸本)9781538645475

The emerging of millimeter wave (mmWave) communications has been widely predicted to revolutionize the traditional communications. On one hand, the large bandwidth provided by mmWave is orders of magnitudes larger than that provided by current microwave communications, which therefore supports much higher throughput as well as massive connectivity. On the other hand, the small wavelength of mmWave signals facilitates the application of massive antennas, thus benefiting from the powerful multiple-input multiple-output (MIMO) beamforming and other MIMO signal processing techniques. However, mmWave-MIMO systems often suffer from prohibitive power consumption due to the massive antennas and radio frequency (RF) chains. Spatial modulation (SM) techniques have been proposed as a low-complexity, low-power-consumption MIMO candidate. More importantly, the idea of incorporating SM techniques into mmWave-MIMO systems has been proved effective for reducing the number of radio frequency (RF) chains, to which many research efforts have been devoted. This paper provides a comprehensive overview of the combination of SM and mmWave communications, with a special emphasis on the hybrid beamforming regimes for SM-motivated mmWave-MIMO systems.

关键词： multiple-input multiple-output spatial modulation generalized spatial modulation millimeter wave hybrid beamforming spectral efficiency bit error rate

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High-resolution imaging using a narrowband MIMO radar system

High-resolution imaging using a narrowband MIMO radar system

引用

9th International Conference on Signal Processing

作者： Ma, Xiao-yan Wang, Dang-wei Su, Yi Wuhan Radar Acad Wuhan 430019 Peoples R China Natl Univ Def Technol Changsha Peoples R China

ISBN: (纸本)9781424421787

This paper presents a system model and method for the two-dimensional (2-D) imaging application via a narrowband multiple-input multiple-output (MIMO) radar system with two perpendicular linear arrays. The proposed method utilities the spatial parallel procedure sampling the scattered echoes during a single snapshot illumination, instead of the spatial sequential one sampling the scattered echoes during multiple snapshot illuminations in inverse synthetic aperture radar (ISAR) imaging. Consequently, the complex motion compensation in ISAR imaging can be avoided. Furthermore, in our array configuration, multiple narrowband shared-spectrum waveforms coded with orthogonal ployphase sequences are employed to illuminate a target. The mainlobe of the compressed echoes front the different filter band for all scatterers could be located in the same range bin, and thus, complex range alignment in classical ISAR imaging is not necessary. Numerical simulations based on synthetic data are provided for testing our proposed method.

关键词： Radar imaging inverse synthetic aperture radar multiple-input multiple-output

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