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

共 889 条记录，以下是491-500 订阅

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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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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...

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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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Ultra-Low Profile Tri-Polarized Antenna for WLAN/MIMO Application

Ultra-Low Profile Tri-Polarized Antenna for WLAN/MIMO Applic...

引用

International Symposium of IEEE-Antennas-and-Propagation-Society / USNC/URSI National Radio Science Meeting

作者： Payne, Komlan Choi, Jun H. Jang, Taehee Syracuse Univ Elect Engn & Comp Sci Syracuse NY 13244 USA JMA Wireless 7645 Henry Clay Blvd Liverpool NY 13088 USA

ISBN: (纸本)9781538632840

This paper presents a novel tri-orthogonal polarization antenna operating at 2.4 GHz with good prospective for WLAN and MIMO systems. The design is implemented by integrating dual polarized cross-slot antenna and zeroth-order resonant (ZOR) antenna. The total height of the antenna is 0.762 mm corresponding to 0.01 lambda(g) (where lambda(g) is the guide wavelength at 2.4 GHz). Linear horizontal dual-polarization and vertical polarization radiation patterns are obtained by using cross-polarized slot antennas and ZOR array antenna respectively. The broadside gain provided by the slot radiation is 5.3 dBi while the azimuthal average gain of the ZOR antenna is about 1.2 dBi.

关键词： Metamaterials multiple-input multiple-output polarization diversity slot antennas ZOR antennas

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Channel Estimation for Space-Time Block Coded OFDM Systems using Few Received Symbols 7

Channel Estimation for Space-Time Block Coded OFDM Systems u...

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7th International Joint Conference on Pervasive and Embedded Computing and Communication Systems (PECCS)

作者： Zhang, Biling Yuan, Yipu Yu, Jung-Lang Hsu, Wei-Ting Huang, Yu-Jie Beijing Univ Posts & Telecommun Sch Network Educ Beijing 100876 Peoples R China Quanzhou Normal Univ Coll Phys & Informat Engn Quanzhou 362000 Peoples R China Fu Jen Catholic Univ Dept Elect Engn New Taipei 24205 Taiwan

ISBN: (纸本)9789897582660

A novel subspace channel estimation is proposed for space-time block coded (STBC) multiple-input multiple-output (MIMO) orthogonal frequency division multiplexing (OFDM) systems. Considering the zero-padding technique, the signal model of the STBC-OFDM system is first studied. The major drawback of the subspace method is the slow convergence which requires a large number of received symbols to compute the noise subspace. The repetition index scheme is developed here to increase the number of equivalent received symbols. Using the space-time coding property, the forward-backward method is presented to improve the convergence speed further. Moreover, the repetition index scheme transforms the white noise into non-white one. The noise prewhitening technique is proposed to reduce the non-white noise effect. Computer simulations show the effectiveness of the proposed forward-backward method and noise prewhitening technique.

关键词： Space-Time Block Code multiple-input multiple-output Orthogonal Frequency Division multiplexing Subspace Channel Estimation Forward-backward Method Noise Prewhitening Technique

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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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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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Full-Duplex Single-RF MIMO with Coordinate-Interleaved Space-Time Coding 3

Full-Duplex Single-RF MIMO with Coordinate-Interleaved Space...

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3rd IEEE International Conference on Computer and Communications (ICCC)

作者： Zou, Ming Lin, Lifeng Wen, Miaowen Ma, Meng Jiao, Bingli Peking Univ Sch Elect Engn & Comp Sci Beijing Peoples R China Haihua Elect Enterprise China Co Ltd Guangzhou Guangdong Peoples R China South China Univ Technol Sch Elect & Informat Engn Guangzhou Guangdong Peoples R China

ISBN: (纸本)9781509063529

In this paper, we aim at improving the transmission reliability of multiple-input multiple-output (MIMO) enabled full-duplex (FD) system. To this end, we investigate the implementation of coordinate interleaved orthogonal design (CIOD) based space-time block code in bidirectional FD system, and propose a novel scheme named CI-FD. Theoretical analysis proves that this scheme is able to achieve the full diversity gain of the CIOD technique when the self-interference (SI) of the FD system is effectively suppressed, while maintaining the same spectral efficiency and decoding complexity as the original FD system. Moreover, two performance enhancing schemes based on CI-FD are proposed: 1) CI-FD with antenna selection (AS) that further increases the diversity gain, and 2) CI-FD with spatial modulation (SM) that provides an additional spectral efficiency gain. Upper bounds on the average bit error probabilities of the proposed schemes are derived and their error-free information transmission capabilities are also investigated. Simulation results verify our analysis and demonstrate the advantages of the proposed schemes.

关键词： full-duplex multiple-input multiple-output diversity gain coordinate interleaved orthogonal design

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Frequency Reconfigurable Compact MIMO Antenna for WLAN application

Frequency Reconfigurable Compact MIMO Antenna for WLAN appli...

引用

International Symposium on Antennas and Propagation (ISAP)

作者： Kambali, Vijay Abegaonkar, Mahesh Basu, Ananjan Indian Inst Technol IIT Delhi Ctr Appl Res Elect New Delhi India

ISBN: (纸本)9781538604656

A frequency reconfigurable multiple-input multiple-output (MIMO) antenna for Wireless Local Area Network(WLAN) application is proposed. multiple-input multiple-output (MIMO) technology has been incorporated into wireless local area networks (WLANs) through the IFEE802.11n and 802.11ac standards. These AMMO WLAN systems can support up to four antenna elements and four data streams for each user or mobile station. These systems operate in the frequency hands of 2.4-2.5 GHz (802.11n) and 4.9-5.725 GHz. (802.11n and ac).

关键词： multiple-input multiple-output Frequency reconfigurable antenna WLAN

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Advanced Half-Duplex Cooperative Scheme for Immersive Signage Transmission 17

Advanced Half-Duplex Cooperative Scheme for Immersive Signag...

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3rd International Conference on Communication and Information Processing (ICCIP)

作者： Shim, Seong-Joon Paek, Min-Jae Park, Sung-Soon Song, Hyoung-Kyu Sejong Univ UT Commun Res Inst Seoul South Korea

ISBN: (纸本)9781450353656

In Signage network systems, cooperative communication system is effective when a direct link between two nodes doesn't exist or a condition of the link is poor by allocating another node between the two nodes to relay signals. As a relay node, a half-duplex relay is widely used for ease of implementation. The half-duplex cooperative communication system using one half-duplex relay node has problems for loss of spectral efficiency and capacity. To solve these problems, a two-path relay cooperative communication system using two half-duplex relays has been actively studied. Although the two-path relay cooperative communication system solves the loss problems by transmitting signals to relay nodes alternately, the simultaneous transmission of the source node and one of the relay nodes causes inter-relay interference (IRI) at the other relay nodes. This paper proposes new two-path relay cooperative transmission method which cancels the IRI at the relay nodes and obtains the spatial diversity gain by using two antennas at the relay nodes. Unlike the conventional scheme which cancels the IRI at the destination node, the interferences aren't accumulated and aren't propagated to the destination node when the distance between the relay nodes decreases in the proposed method. Therefore, the proposed method can improve the reliability of multi-hop based signage network by canceling interference at the relay nodes.

关键词： Inter-relay interference multiple-input multiple-output cyclic delay diversity cooperative communication OFDM

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A Wideband 3D GBSM for High Speed Railway Communication System 85

A Wideband 3D GBSM for High Speed Railway Communication Syst...

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IEEE 85th Vehicular Technology Conference (VTC Spring)

作者： Feng, Liu Fan, Pingzhi Southwest Jiaotong Univ Inst Mobile Commun Chengdu Sichuan Peoples R China

ISBN: (纸本)9781509059324

In this paper, three-dimensional (3D) regular-shaped geometry-based stochastic model (RS-GBSM) is developed for wideband multiple-input multiple-output (MIMO) high speed railway communication system under non-isotropic scattering condition. Correlations of the proposed model in space, time and frequency are studied. Numerical result shows that the simulation model fits the reference model well.

关键词： GBSM sphere model channel modeling wide-band multiple-input multiple-output

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