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

共 888 条记录，以下是681-690 订阅

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Non-Regenerative Multi-Hop MIMO Relays Using MMSE-DFE Technique

Non-Regenerative Multi-Hop MIMO Relays Using MMSE-DFE Techni...

引用

IEEE Global Telecommunications Conference (GLOBECOM 2010)

作者： Rong, Yue Curtin Univ Technol Dept Elect & Comp Engn Bentley WA 6102 Australia

ISBN: (纸本)9781424456383

In this paper, we study multi-hop non-regenerative multiple-input multiple-output (MIMO) relay communications with any number of hops. We design the optimal source precoding matrix and the optimal relay amplifying matrices for such relay network where a nonlinear decision feedback equalizer (DFE) based on the minimal mean-squared error (MMSE) criterion is used at the destination node. We show that when the composite objective function is Schur-convex, the MMSE-DFE receiver together with the optimal source and relay matrices enable an arbitrary number of source symbols to be transmitted at one time, and yield a significantly improved performance compared with non-regenerative MIMO relay systems using linear receivers at the destination.

关键词： MIMO communication MMSE-DFE technique Schur-convex decision feedback equalisers decision feedback equalizer least mean squares methods minimal mean-squared error multi-hop MIMO relays multiple-input multiple-output optimal source relay matrices

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MIMO-OFDM channel modeling and performance

MIMO-OFDM channel modeling and performance

引用

8th Middle Eastern Simulation Multiconference

作者： Daoud, Omar Al-Akaidi, Marwan Ivins, Jonathan De Montfort Univ Sch Engn & Technol Leicester LE1 9BH Leics England

ISBN: (纸本)9789077381281

This paper presents a systematic derivation of the channel capacity of MIMO-OFDM systems. In addition, we model a new MIMO channel to help in understanding the effect of spatial multiplexing on the MlMO channel, such as reducing the capacity and the BER, if spatial correlation is high. This effect will be found for some of the Space Division multiplexing (SDM) algorithms, namely, Zero Forcing (ZF) and Minimum Mean-Square Error (MMSE).

关键词： orthogonal frequency division multiplexing multiple-input multiple-output capacity SDM STC

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Design and Experimental Demonstration of Mirror-Aided Non-imaging Receiver for Indoor MIMO-VLC Systems 3

Design and Experimental Demonstration of Mirror-Aided Non-im...

引用

3rd ACM Workshop on Hot Topics in Wireless (HotWireless)

作者： Park, Ki-Hong Oubei, Hassan M. Alheadary, Wael G. Ooi, Boon S. Alouini, Mohamed-Slim King Abdullah Univ Sci & Technol KAUST Thuwal Makkah Province Saudi Arabia

ISBN: (纸本)9781450342513

Visible light communication (VLC) has attracted great attention with the development of the emerging solid-state lighting sources. multiple-input multiple-output (MIMO) technique is promising to support high data rate VLC thanks to the deployment of multiple lighting sources. However, high channel correlation in indoor MIMO-VLC channels is critical to the performance of indoor MIMO-VLC systems. The advanced non-imaging receivers in recent works reduce the channel correlation by directivity for each photodetector (PD) by interfering the reception of light oriented in the specific direction. Contrary to previous works, we propose in this paper a new mirror-embedded non-imaging receiver which not only blocks the reception of light on one specific direction but also improves the channel gain on the other direction by receiving the light reflected by a double-sided mirror deployed between the PDs. Numerical results and experimental demonstration show that our proposed mirror diversity receiver (MDR) are more beneficial to obtain well-conditioned channel matrices for spatial-multiplexing MIMO-VLC systems supporting high speed data transmission.

关键词： Visible light communication multiple-input multiple-output non-imaging receiver design

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MIMO communication systems employing per transmit antenna differential mapping (PADM)

MIMO communication systems employing per transmit antenna di...

引用

59th IEEE Vehicular Technology Conference

作者： Kubo, H Higashinaka, M Okazaki, A Penther, B Murakami, K Mitsubishi Electr Corp Inform Technol R&D Ctr Kamakura Kanagawa 2478501 Japan

ISBN: (纸本)0780382552

This paper proposes multiple-input multiple-output (MIMO) communication systems employing different differential mapping per transmit antenna, i.e., per transmit antenna differential mapping (PADM) and its demodulation by means of per-survivor processing (PSP). The features of PADM are as follows: 1) it can be applied to both transmit diversity (TD) and space multiplexing (SM);2) it can be applied to multiple-input single-output (MISO) as well as MIMO;3) it can perform maximum-likelihood detection without channel state information (CSI) by means of finite-state PSP. First, this paper evaluates PSP based on the MP pseudo inverse matrix, and proposes a mapping scheme for PADM according to the evaluated results. Next, this paper shows configuration of TD and SM. Finally computer simulation confirms that the proposed PADM has excellent performance in the case of TD and SM.

关键词： transmit diversity spatial multiplexing space-time signal processing multiple-input multiple-output Viterbi detection per-survivor processing

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A tri-band notched Ultra-wideband MIMO Antenna

A tri-band notched Ultra-wideband MIMO Antenna

引用

International Symposium on Antennas and Propagation (ISAP)

作者： Zhang, Yu Jiao, Yong-Chang Yang, Mi-Mi Zhao, Bao-Li Xidian Univ Natl Key Lab Antennas & Microwave Technol Xian 710071 Peoples R China

ISBN: (纸本)9787900914040

In this letter, a compact ultra-wideband (UWB) multiple-input multiple-output (MIMO) antenna with a high isolation covering 3.1-10.6 GHz UWB bands is presented. The proposed antenna is based on planar monopoles, and three band rejections are achieved by adding three Archimedes spiral electromagnetic band gap (As-EBG) structures. Isolation between two radiators is improved by suppressing the surface current flow through the T-shaped strip and triangular slot on the ground plane. The proposed antenna has a low mutual coupling of less than -20 dB over the target band (3.1-10.6 GHz). Therefore, the proposed antenna is a good candidate for UWB MIMO portable applications.

关键词： Ultra-wideband multiple-input multiple-output AS-EBG

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Outage Performance of NOMA with Majority Based TAS/MRC Scheme in Rayleigh Fading Channels 27

Outage Performance of NOMA with Majority Based TAS/MRC Schem...

引用

27th Signal Processing and Communications Applications Conference (SIU)

作者： Aldababsa, Mahmoud Kucur, Oguz Gebze Tech Univ Elect Engn Gebze Turkey

ISBN: (纸本)9781728119045

In this paper, we propose a new suboptimal antenna selection (AS) algorithm, majority based transmit antenna selection (TAS-maj), to maximize the system performance of the non-orthogonal multiple access (NOMA). The TAS-maj scheme chooses the transmit antenna with the majority. It has remarkable advantages over previously proposed AS algorithms It has lower computational complexity than optimal AS scheme. Also, it provides better performance than the suboptimal AS algorithms, max-max-max (A(3)) and max-min-max (AIA), since these algorithms aim to maximize the performance of the strong and weak users, respectively. On the other hand, the TAS-maj scheme aims to optimize the performance of more than half of the mobile users in the NOMA network. In this paper, multiple-input multiple-output communication system is considered, in which all the nodes are equipped with multi-antenna. The diversity schemes TAS-maj and maximal ratio combining (MRC) are employed at the base station and mobile users, respectively. Meanwhile, the expression of the signal-to-interference-and-noise is derived. Then, the outage behavior of the NOMA with the TAS-maj/MRC scheme is investigated over Rayleigh fading channels by the Monte Carlo simulations.

关键词： Non-orthogonal multiple access multiple-input multiple-output Transmit antenna selection Maximal ratio combining Majority Rayleigh Monte Carlo simulation

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Derivation and Analysis of Outage Probability for Multi-User Multi-polarized Antenna in Uplink System

Derivation and Analysis of Outage Probability for Multi-User...

引用

IEEE International Conference on Signal Processing and Communication (ICSPC)

作者： Mohammed, Abdul Hai Muzammil Moinuddin, Muhammad Al-Saggaf, Ubaid M. Ahmed, Rafeeq King Abdulaziz Univ Dept Elect & Comp Engn CEIES POB 80200 Jeddah 21589 Saudi Arabia

ISBN: (纸本)9781509067305

In this paper, we derive Outage Probability in closed form for a Multi-user Multi-polarized antenna in an uplink communication. The derived expression is generalized and valid for polarized antenna of any polarization order. This analytical expression is then validated through extensive simulations for different system parameters. Moreover, the analysis is used to investigate the effect of various system properties, such as Cross Polarization Discrimination (XPD) and noise variance. Finally, we compared the performance of Dual and Triple Polarized antennas in terms of Outage Probability, which provides us a good measure for the selection of these polarized antennas.

关键词： Cross Polarization Discrimination multiple-input multiple-output Channel State Information Signal-to-interference-plus-noise ratio

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Swish-Driven GoogleNet for Intelligent Analog Beam Selection in Terahertz Beamspace MIMO 95

Swish-Driven GoogleNet for Intelligent Analog Beam Selection...

引用

IEEE 95th Vehicular Technology Conference: (VTC-Spring)

作者： Hosein, Zarini Mohammad, Robat Mili Rasti, Mehdi Andreev, Sergey Nardelli, Pedro H. J. Amirkabir Univ Technol Dept Comp Engn Tehran Iran Sharif Univ Technol Elect Res Inst Tehran Iran Tampere Univ Tampere Finland Lappeenranta Lahti Univ Technol Lappeenranta Finland

ISBN: (数字)9781665482431

ISBN: (纸本)9781665482431

In this paper, we propose an intelligent analog beam selection strategy in a terahertz (THz) band beamspace multiple-input multiple-output (MIMO) system. First inspired by transfer learning, we fine-tune the pre-trained off-the-shelf GoogleNet classifier to learn analog beam selection as a multi-class mapping problem. Simulation results show 83% accuracy for the analog beam selection, which subsequently results in 12% spectral efficiency (SE) gain over the existing counterparts. For a more accurate classifier, we replace the conventional rectified linear unit (ReLU) activation function of the GoogleNet with the recently proposed Swish and retrain the fine-tuned GoogleNet to learn analog beam selection. It is numerically indicated that the fine-tuned Swish-driven GoogleNet achieves 86% accuracy, as well as 18% improvement in achievable SE, over the similar schemes. Eventually, a strong ensembled classifier is developed to learn analog beam selection by sequentially training multiple fine-tuned Swish-driven GoogleNet classifiers. According to the simulations, the strong ensembled model is 90% accurate and yields 27% gain in achievable SE in comparison with prior methods.

关键词： Terahertz (THz) band beamspace multiple-input multiple-output analog beam selection GoogleNet Swish ensembled classifier

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A Study on Turbo Equalization for MIMO System based on LDPC codes 8

A Study on Turbo Equalization for MIMO System based on LDPC ...

引用

8th International Conference on Ubiquitous and Future Networks (ICUFN)

作者： Baek, Chang-uk Jung, Ji-won Korea Maritime & Ocean Univ Dept Radio Commun Engn 727 Taejong Ro Busan South Korea

ISBN: (纸本)9781467399913

In this paper, MIMO (multiple-input-multiple output) system based on turbo equalization techniques which LDPC (Low Density Parity Check) codes were outer code and STTC (Space Time Trellis Code) were employed as an inner code are studied. LDPC may be applied these system, it must make BCJR output be hard decision data. It caused performance degraded. This paper proposed turbo equalization model for LDPC codes able to apply MIMO system combined with STTC codes. By the simulation results, we confirmed performance of proposed turbo equalization model was improved about 2.5 dB than that of turbo codes and about 11.5dB than that of conventional LDPC codes.

关键词： multiple-input multiple-output Space Time Code Low Density Parity Check Code Layered Space Time Code

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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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