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

共 889 条记录，以下是651-660 订阅

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Capacity Lower Bound of Visible Light Communications Precoding on Zonotopes

Capacity Lower Bound of Visible Light Communications Precodi...

引用

IEEE Wireless Communications and Networking Conference (IEEE WCNC)

作者： Wang, Xiaoqian Xia, Liang Yuan, Yifei Liu, Guangyi Wang, Qixing Wang, Jiangzhou China Mobile Res Inst Beijing Peoples R China Univ Kent Sch Elect Engn & Digital Arts Canterbury CT2 7NZ Kent England

ISBN: (纸本)9781665442664

As one of the potential candidate technologies for sixth generation (6G), visible light communication (VLC) can provide indoor communication services with high data rate when combined with multiple-input multiple-output (MIMO). In this paper, we first study the impact of precoding on zonotopes model of channel and then derive the capacity of VLC-MIMO with precoding when the number of transmitters is greater than receivers. Based on the zonotopes graph, two design principles for VLC-MIMO optimal precoding are obtained. Simulation results show that the commonly used radio frequency (RF)-MIMO precodings can hardly catch the capacity lower bound. The optimal precoding in RF may not be optimal in VLC.

关键词： 6G visible light communication lower bound multiple-input multiple-output zonotopes precoding

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Three-Dimensional Deterministic Detection and Estimation Algorithms for MIMO SFCW Radars

Three-Dimensional Deterministic Detection and Estimation Alg...

引用

IEEE Radar Conference (RadarConf)

作者： Davoli, Alessandro Sirignano, Emilio Vitetta, Giorgio M. Univ Modena & Reggio Emilia Dept Engn Enzo Ferrari Modena MO Italy

ISBN: (纸本)9781728189420

In this paper, the problem of detection and joint estimation of range, azimuth and elevation of multiple targets in a multiple-input multiple-output stepped-frequency continuous wave radar system is investigated. Two iterative deterministic algorithms are illustrated and their accuracy is assessed on the basis of the raw data acquired from a commercial radar device. Our results evidence that these algorithms achieve similar accuracies, but at the price of substantially different computational efforts.

关键词： Radar multiple-input multiple-output stepped frequency continuous wave

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Near-Optimal Power Allocation with PSO Algorithm for MIMO Cognitive Networks using multiple AF Two-Way Relays

Near-Optimal Power Allocation with PSO Algorithm for MIMO Co...

引用

IEEE International Conference on Communications (ICC)

作者： Alsharoa, Ahmad Ghazzai, Hakim Alouini, Mohamed-Slim KAUST Comp Elect & Math Sci Engn CEMSE Div Thuwal Makkah Province Saudi Arabia

ISBN: (纸本)9781479920037

In this paper, the problem of power allocation for a multiple-input multiple-output two-way system is investigated in underlay Cognitive Radio (CR) set-up. In the CR underlay mode, secondary users are allowed to exploit the spectrum allocated to primary users in an opportunistic manner by respecting a tolerated temperature limit. The secondary networks employ an amplify-and-forward two-way relaying technique in order to maximize the sum rate under power budget and interference constraints. In this context, we formulate an optimization problem that is solved in two steps. First, we derive a closed-form expression of the optimal power allocated to terminals. Then, we employ a strong optimization tool based on particle swarm optimization algorithm to find the power allocated to secondary relays. Simulation results demonstrate the efficiency of the proposed solution and analyze the impact of some system parameters on the achieved performance.

关键词： multiple-input multiple-output two-way cognitive radio particle swarm optimization

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A Sparse-Coded multiplexing Approach for MIMO Over-the-Air Federated Learning

A Sparse-Coded Multiplexing Approach for MIMO Over-the-Air F...

引用

IEEE Conference on Global Communications (IEEE GLOBECOM) - Intelligent Communications for Shared Prosperity

作者： Zhong, Chenxi Yuan, Xiaojun Univ Elect Sci & Tech China Yangtze Delta Reg Inst Huzhou Peoples R China Univ Elect Sci & Tech China Natl Key Lab Wireless Commun Huzhou Peoples R China

ISBN: (纸本)9798350310900

The communication bottleneck of over-the-air federated learning (OA-FL) lies in uploading the gradients of local learning models. In this paper, we study the reduction of the communication overhead in the gradients uploading by using the multiple-input multiple-output (MIMO) technique. We propose a novel sparse-coded multiplexing (SCoM) approach that employs sparse-coding compression and MIMO multiplexing to balance the communication overhead and the learning performance of the FL model. We derive an upper bound on the learning performance loss of the SCoM-based MIMO OA-FL scheme by quantitatively characterizing the gradient aggregation error. We show that the optimal number of multiplexed data streams to minimize the upper bound is given by the minimum of the numbers of transmit and receive antennas. We then formulate an optimization problem of designing precoding and post-processing matrices to minimize the gradient aggregation error, and develop an efficient algorithm to solve the problem. The numerical results indicate the effectiveness of the proposed SCoM approach.

关键词： Over-the-air federated learning multiple-input multiple-output multiplexing turbo compressed sensing

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Relay and Antenna Selection Considering the Battery Energy in MIMO DF Cooperative Networks 9

Relay and Antenna Selection Considering the Battery Energy i...

引用

2017 9th IEEE International Conference on Communication Software and Networks (ICCSN 2017)

作者： Zhongyao Zhou Kun Xiao Deli Fu Guangxi Normal University

ISBN: (纸本)9781509038237;9781509038220

A relay and antenna selection scheme is proposed for multiple-input multiple-output decode-and-forward cooperative networks, where multiple antennas are installed at the grid-powered source, the battery-powered relays and the grid-powered destination. In order to prolong the network lifetime and avoid the serious degradation of the network performance, the residual energy in the battery of each battery-powered relay is also considered for the relay and antenna selection, besides the channel conditions between the transmitting antennas and the receiving antennas. Another important feature of the proposed scheme lies in the variable number of transmitting antennas selected for data forwarding. The performance of the proposed scheme, in terms of average channel capacity and average network lifetime, is validated by Monte Carlo simulations. The simulation results show that the proposed scheme is superior to the compared scheme in the network performance. Most of all, the network lifetime is significantly prolonged.

关键词： multiple-input multiple-output decode-and-forward cooperative networks network lifetime relay and antenna selection

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Joint Precoding for Intelligent Reflecting Surface-Aided Millimeter Wave Secure Communications 3

Joint Precoding for Intelligent Reflecting Surface-Aided Mil...

引用

3rd Information Communication Technologies Conference (ICTC)

作者： Li, Wenmeng Zhang, Yehua Bian, Baoyin Yang, Hongzhen Li, Lang Wang, Xuan Wang, Jun-Bo Zhang, Hua NARI Grp Corp State Grid Elect Power Res Inst Nanjing 211106 Peoples R China State Grid Zhengjiang Elect Corp Informat & Telec Hangzhou 31005 Peoples R China Southeast Univ Natl Mobile Commun Res Lab Nanjing 211111 Peoples R China

ISBN: (纸本)9781665495080

In this paper, we investigate an intelligent reflecting surface (IRS) aided millimeter wave (mmWave) secure communication system. To maximize the secrecy rate at the legitimate receiver, we jointly optimize the active hybrid precoding at the transmitter and passive precoding at the IRS. Since the optimization problem is non-convex, an alternating optimization based algorithm is proposed, i.e., we iteratively solve digital baseband precoding, analog radio frequency precoding or one of the reflection coefficients with the others fixed. Simulation results show that our proposed algorithm can effectively improve the security performance of the system.

关键词： Intelligent reflecting surface multiple-input multiple-output millimeter wave hybrid precoding physical layer security

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Outage Performance of NOMA with TAS/MRC in Dual Hop AF Relaying Networks

Outage Performance of NOMA with TAS/MRC in Dual Hop AF Relay...

引用

Advances in Wireless and Optical Communications (RTUWO) Conference

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

ISBN: (纸本)9781538605851

We study outage performance of a downlink multiple-input multiple-output non-orthogonal multiple access (MIMO-NOMA) in dual hop amplify-and-forward (AF) relay communication system over frequency non-selective and slow fading channels with Nakagami-m distribution. In the network, the base station (BS) and mobile users equipped by multi-antenna communicate by the help of fixed gain AF relay with single antenna. In the network, transmit antenna selection (TAS) and maximal ratio combining (MRC) diversity techniques are employed at the BS and mobile users, respectively. Exact closed-form outage probability is derived. Analytical results are validated by Monte Carlo simulations.

关键词： multiple-input multiple-output Non-orthogonal multiple access Transmit antenna selection maximal ratio combining Nakagami-m fading Outage probability Dual hop AF relay network Fixed gain

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Limited Feedback MIMO Precoding via Alternating multiple Differential Codebooks

Limited Feedback MIMO Precoding via Alternating Multiple Dif...

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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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Autoencoder based Communication System using Multi-Dimensional Constellations 35

Autoencoder based Communication System using Multi-Dimension...

引用

35th International Technical Conference on Circuits/Systems, Computers and Communications (ITC-CSCC)

作者： Lee, Hyungje Eom, Chahyeon Lee, Hyojin Lee, Chungyong Yonsei Univ Sch Elect & Elect Engn 50 Yonsei Ro Seoul South Korea Samsung Res Samsung Elect 56 Sungchon Gil Seoul South Korea

ISBN: (纸本)9784885523281

This paper proposes an autoencoder based multiple-input multiple-output (MIMO) communication system. The proposed autoencoder learns and optimizes for only line of sight (LOS) component of Rician channel. In addition, we adopt multi-dimensional constellation (MDC) in autoencoder, where it is obtained during learning process of autoencoder by adjusting hyperparameter. Simulation results show that our proposed autoencoder using MDC achieves better symbol error rate (SER) performance compared to conventional communication system which uses quadrature amplitude modulation (QAM) constellation. Furthermore, we confirmed that although proposed autoencoder is learned for only LOS component, it can be applied to random Rician flat fading channels with fading components and channel variation terms.

关键词： autoencoder multiple-input multiple-output multi-dimensional constellation Rician flat fading channel

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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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