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

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Proposal of MU-MIMO system with block diagonalization in multi-site communication system

Proposal of MU-MIMO system with block diagonalization in mul...

引用

IEEE Region 10 Conference on TENCON

作者： Ezoe, Koki Fukada, Keisuke Hattori, Takeshi Yairi, Ikuko Eguchi Fukushima, Yusuke Sophia Univ Fac Sci & Technol Tokyo 102 Japan

ISBN: (纸本)9781457702556

Multi-site multi-user multiple input multiple output (MS-MU-MIMO) is a key technology to construct the next generation high performance mobile communication networks;however, in MS-MU-MIMO systems, co-channel interference (CCI) occurred at cell edges significantly reduce user throughput. To overcome this problem, in this paper, we proposed a MS-MU-MIMO system with block diagonalization (BD)-based interference cancellation. Overall downlink performances of the proposed system and the traditional MS-MIMO system are compared through computer simulation, and the simulation results show that the proposed system can improved user throughput.

关键词： component multiple-input multiple-output MIMO block diagonalization co-channel interference

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Advanced Half-Duplex Cooperative Scheme for Immersive Signage Transmission 17

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

引用

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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Amplitude-phase precoding scheme for high speed ROF-MIMO systems 11

Amplitude-phase precoding scheme for high speed ROF-MIMO sys...

引用

11th International Conference on Information Optics and Photonics (CIOP)

作者： Li, Rui Zhang, Qi Xin, Xiangjun Tian, Feng Liu, Naijin Tian, Qinghua Zhang, Wei Lin, Ming Wang, Yang Wang, Yongjun Beijing Univ Posts & Telecommun Xitucheng Rd 10 Beijing 100876 Peoples R China Key Lab Space Ground Interconnect & Convergence Xitucheng Rd 10 Beijing 100876 Peoples R China China Acad Space Technol Friendship Rd 104 Beijing 100094 Peoples R China Guangdong Univ Technol Waihuan West Rd 100 Guangzhou 510006 Guangdong Peoples R China China Elect Power Res Inst Co Ltd Qinghexiaoying East Rd 15 Beijing 100192 Peoples R China

ISBN: (数字)9781510631748

ISBN: (纸本)9781510631748

An amplitude-phase precode method that based on a high speed ROF-MIMO system is proposed to solve the distortion problem due to the features of optical devices and link damages. This method uses the digital predistortion algorithm model,which is based on Weierstrass theorem. This could precompensation to the ROF links and reduce the influence of nonlinear characteristics of optical devices such as erbium-doped fiber amplifiers on system signal transmission, and solve the sensitivity of QAM, OFDM and other non-constant envelope modulation signals to system distortion. Then the Minimum Mean Square Error (MMSE) precoding method is used to optimize the spatial characteristics of the MIMO transmission signal to solve the signal interference problem, so as to reduce the bit error rate of the system and reduce the complexity of digital signal processing at the user terminal. The simulation results show that the bit error rate (BER) performance of ROF system with the proposed amplitude-phase precode method is lower than 4*10-4 during the transmitting 10 Gb/s 16QAM-OFDM signal in 20km standard single model fiber. The proposed scheme has the obvious lower bit error rate than the non-precode high speed ROF-MIMO system. Therefore, the proposed scheme improves the base station and antenna array coverage, at same time, reduce the complexity of terminal unit and increase the stability of the system transmission.

关键词： Radio-Over-Fiber Precoding multiple-input multiple-output MMSE OFDM 16QAM

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Performance Analysis of the Imaging Receivers Using a Hemispherical Lens for Visible Light Communications

Performance Analysis of the Imaging Receivers Using a Hemisp...

引用

International Conference on Wireless Communications and Signal Processing (WCSP)

作者： Li, Baolong Lai, Xiaoquan Wang, Jiaheng Liang, Xiao Zhao, Chunming Southeast Univ Natl Mobile Commun Res Lab Nanjing 210096 Jiangsu Peoples R China

ISBN: (纸本)9781479903085

A hemispherical lens is often used in Visible Light Communication (VLC) systems to provide a wide field of view (FOV) and spatial multiplexing gain. Depending on the way of placing the lens, in practice there are generally two kinds of receivers, namely the flat-surface and curved-surface receivers, where the former one uses the flat surface of lens to collect light from the LED while the latter one uses the curved surface. We first derive the channel gain of the single-input single-output (SISO) VLC system with a finite receiving area, and then compare the channel gains of the two receivers in various scenarios. It is shown that the flat-surface receiver could provide a wider FOV than the curved-surface receiver. We further study the performance of two receivers in multiple-input multiple-output (MIMO) VLC systems. Through the BER performance analysis, we find that high spatial multiplexing gain could be achieved by both receivers if the receiving plane is properly located.

关键词： field of view hemispherical lens spatial multiplexing multiple-input multiple-output visible light communication

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Machine Learning-based MIMO Signal Detection in Wireless Networks with Random Traffic

Machine Learning-based MIMO Signal Detection in Wireless Net...

引用

IEEE Wireless Communications and Networking Conference (IEEE WCNC)

作者： Lai, Po-Yen Gau, Rung-Hung Natl Yang Ming Chiao Tung Univ Inst Commun Engn Hsinchu Taiwan

ISBN: (纸本)9781665442664

In this paper, we propose a novel machine learning-based signal detection scheme for multi-user wireless multiple-input multiple-output (MIMO) networks with random traffic. We focus on the challenging case in which the number of active users that transmit data to the base station in a time slot is a random variable from the viewpoint of the base station. Instead of using multiple machine learning models and exhaustive search, we propose using a novel deep machine learning model that adopts an extended constellation diagram and a loss function based on the nonuniform probability mass function for transmitted symbols. Simulation results reveal that the proposed machine learning-based signal detection scheme outperforms the zero-forcing detector and the minimum mean square error detector in wireless MIMO networks when the number of active users is random.

关键词： multiple-input multiple-output wireless communications signal detection machine learning deep neural networks random traffic prior probability

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A Low Complexity Relay Selection & Power Allocation Schemes for Cognitive MIMO Buffer-Aided DF Relay Networks

A Low Complexity Relay Selection & Power Allocation Schemes ...

引用

IEEE Wireless Communications and Networking Conference (WCNC)

作者： Al-Eryani, Yasser F. Salhab, Anas M. Zummo, Salam A. King Fand Univ Petr & Minerals Dept Elect Engn Dhahran 31261 Saudi Arabia

ISBN: (纸本)9781467398145

In this paper, we consider decode-and-forward (DF) buffer-aided relay selection and transmission power allocation for underlay cognitive radio (CR) network that is equipped with multiple-input multiple-output (MIMO) antenna scheme. We propose a low complexity MIMO-based relay selection scheme that maximizes the single-hop normalized rate of the secondary network (SN). Also, we propose a sub-optimal antenna transmission power allocation scheme that maximizes the overall normalized sum rate of the primary network (PN) and the SN. We first derive optimal expressions for antenna transmission power of both the PN and the SN. The derived expressions are then used in an iterative algorithm to produce a near-optimum solution that maximizes the normalized sum rat per time slot. Simulation results are provided to evaluate the performance of the proposed MIMO-based relay selection and antenna transmission power allocation schemes and compare their performance with that of the optimal scenario. Impact of several system parameters including buffer maximum size, interference threshold and number of antennas on network performance are also investigated. Results reveal that the proposed sub-optimal relay selection and antenna transmission power allocation schemes introduce a satisfactory performance with much lower complexity compared to optimal relay selection and power allocation schemes. Findings also show that using buffer-aided relays significantly enhances the SN performance while slightly weakens the performance of the PN.

关键词： Cognitive radio decode-and-forward buffer-aided multiple-input multiple-output convex optimization iterative algorithm

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Multi-User MIMO-OFDM for Indoor Visible Light Communication Systems

Multi-User MIMO-OFDM for Indoor Visible Light Communication ...

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3rd IEEE Global Conference on Signal and Information Processing (GlobalSIP)

作者： Wang, Qi Wang, Zhaocheng Qian, Chen Quan, Jinguo Dai, Linglong Tsinghua Univ Dept Elect Engn Tsinghua Natl Lab Informat Sci & Technol TNList Beijing 100084 Peoples R China Tsinghua Univ Shenzhen Grad Sch Div Informat Sci & Technol Shenzhen 518055 Peoples R China

ISBN: (纸本)9781479975914

In this paper, we investigate an indoor multi-user visible light communication system employing multiple-input multiple-output (MIMO) orthogonal frequency-division multiplexing (OFDM). For each subcarrier in OFDM, the corresponding precoding matrix is calculated in the frequency domain to eliminate multi-user interference. The distances of the multiple transmitter-receiver links are different, which results in various temporal delays and phase differences in the frequency domain. Phase information is firstly considered, whereby complex instead of real channel matrices are used for precoding, which reduces the channel correlation and achieves better performance. Moreover, two DC bias and scaling factor calculation schemes are proposed, and their performances are compared with zero forcing and minimum mean-squared error (MMSE) precoding techniques.

关键词： Visible light communication multiple-input multiple-output orthogonal frequency-division multiplexing multi-user precoding

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Design of Heterogeneous QoS Guaranteed Superposition Virtual Channel aided MIMO Systems 2018

Design of Heterogeneous QoS Guaranteed Superposition Virtual...

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2nd International Conference on Telecommunications and Communication Engineering (ICTCE)

作者： Li, Xinyue Chi, Xuefen Zhao, Linlin Jilin Univ Sch Commun Engn Nanhu Rd 5372 Changchun Jilin Peoples R China

ISBN: (纸本)9781450365857

Superposition virtual channel ( SVC) method can enhance spatial reusability and SVC vector changes transmission channel matrix to improve system performance. However, the study of quality of service ( QoS) provisioning is still blank in SVC aided multiple-input multiple-output ( MIMO) system especially when heterogeneous services are transmitted. We propose the heterogeneous QoS guaranteed ( HQG) SVC method to satisfy different delay-QoS requirements of heterogeneous services as well as increase system effective capacity ( EC). As EC measures the capacity meeting delay-QoS requirements, we derive EC for the investigated system under Nakagami-m fading channel. Targeting at maximizing EC and obtaining better bit error rate ( BER), an optimization problem is established to obtain the optimal HQG SVC vector. In order to simplify the multi-objective problem, we make the magnitudes of EC and BER on the same order through mathematical treatment and design a weighting fitness function of these two metrics. Simulation results show that the HQG SVC method can provide not only a best EC but also a similar BER as SVC method, which indicates that the HQG SVC method can guarantee heterogeneous delay-QoS requirements.

关键词： Effective capacity heterogeneous QoS guaranteed joint optimization multiple-input multiple-output superposition virtual channel

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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...

引用

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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Evolution Process of a Wideband Dual Polarized MIMO antenna System for Wireless Access Point Applications 7

Evolution Process of a Wideband Dual Polarized MIMO antenna ...

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7th International Symposium on Telecommunications (IST)

作者： Moradikordalivand, A. Rahman, T. A. Evizal Fadoul, M. M. Univ Teknol Malaysia Fac Elect Engn Wireless Commun Ctr Skudai 81310 Johor Malaysia

ISBN: (纸本)9781479953592

In this Paper evolution process of a wideband multiple-input multiple-output (MIMO) antenna system applicable for indoor wireless Access Point (WAP) is presented. The MIMO antenna system consists of two common element microstrip-fed monopole antennas with dual polarization. Due to the physically common integration of the MIMO antenna system, maintaining a high level of isolation between the antennas is a difficult design challenge. Here, a new parasitic element is introduced in order to improve the performance of the isolation between the ports. The proposed MIMO antenna system is simulated and optimized using CST Microwave Studio. The designed antenna system was fabricated and measurement was conducted to compare the simulation and measurement results. The simulated and measured -15 dB coupling coefficient is 23% (2.3 to 2.9 GHz) to cover WiFi 2.4 GHz and long term evolution (LTE) 2.6GHz applications.

关键词： Microstrip-fed antenna multiple-input multiple-output SCFC technique dual polarized

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