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

共 889 条记录，以下是431-440 订阅

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A Two-Hop MIMO Relay Architecture Using LTE and Millimeter Wave Bands in High Speed Trains

A Two-Hop MIMO Relay Architecture Using LTE and Millimeter W...

引用

IEEE Wireless Communications and Networking Conference (WCNC)

作者： Oliva, David Alonso, Jose I. Univ Politecn Madrid Informat Proc & Telecommun Ctr Ave Complutense 30 E-28040 Madrid Spain

ISBN: (纸本)9781538617342

One primary challenge in High Speed Trains (HST) is that mobile communications suffer from severe attenuation and high Doppler spread in Long Term Evolution-Advanced (LTE-A) scenarios. In this article, a novel two-hop relay architecture is presented by utilizing Mobile Relay Nodes (MRN) and millimeter wave (mmWave) bands at 60 GHz to forward the signal inside the train. A multiple-input multiple-output (MIMO) channel is established between the Donor-eNB (DeNB) and the Users Equipment (UE) to enhance channel capacity. Finally, performance analysis is studied and discussed by means of a downlink-level simulator.

关键词： multiple-input multiple-output Millimeter Wave Mobile Relay Node High Speed Train Long Term Evolution-Advanced

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D2D Assisted MU-MIMO Precoding to Enhance LTE Network 12th

D2D Assisted MU-MIMO Precoding to Enhance LTE Network

引用

12th International Conference on Communications and Networking in China (CHINACOM)

作者： Zhang, Yanqiu Fang, Shu Han, Yuanchao Zeng, Yu Univ Elect Sci & Technol China Dept Natl Key Lab Commun Chengdu Sichuan Peoples R China Qingshuihe Campus 2006Xiyuan Ave Chengdu 611731 Sichuan Peoples R China

ISBN: (纸本)9783319781303;9783319781297

Multi-user multiple-input multiple-output (MU-MIMO) has been adopted as a key enabling technique to achieve the capacity demand in 4G wireless networks. However, there are still some problems existing in the frequency division duplex (FDD) MU-MIMO system, such as the channel quality indicator (CQI) mismatch problem, large uplink feedback, low pairing probability of MU communication. In this paper, we exploit a MU-MIMO scheme in FDD assisted by device-to-device (D2D) technique to enhance the conventional LTE network. The proposed scheme could not only solve the above problems in conventional MU-MIMO systems, but also achieve significant performance improvement than conventional MU-MIMO schemes. Since the user pairing process is done at the user side, the feedback of the proposed scheme is reduced dramatically compared with the conventional scheme. Simulation results show that the proposed D2D assisted MU-MIMO scheme has clear superiority in terms of throughput over conventional MU-MIMO scheme in LTE networks. Because with D2D assisted MU-MIMO, the proposed scheme tackles the CQI mismatch problem and increases the multi-user pairing probability to enhance the overall throughput.

关键词： Device-to-device multiple-input multiple-output Feedback Channel quality indicator Precoding

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Error Rate Analysis of Precoded-OSTBC MIMO System Over Generalized-K Fading Channel 1st

Error Rate Analysis of Precoded-OSTBC MIMO System Over Gener...

引用

International Conference on Emerging Trends and Advances in Electrical Engineering and Renewable Energy (ETAEERE)

作者： Thakur, Prabhat Tiwari, Keerti Jaypee Univ Informat Technol Dept Elect & Commun Engn Waknaghat 173234 Solan India

ISBN: (纸本)9789811047626;9789811047619

The orthogonal space-time block codes (OSTBCs) increase the diversity order of a multiple-input multiple-output (MIMO) system at a reasonable cost of complexity. However, the precoding technique in which complete channel knowledge is available at the base transceiver station has come into existence with OSTBC for improving the system performance. Moreover, a composite generalized-K channel model has become the key for analyzing both the effects of multipath fading and shadowing. Therefore, this chapter has exploited the precoded OSTBC to improve the bit error rate (BER) performance of MIMO system over a generalized-K fading channel.

关键词： Bit error rate Generalized-K channel multiple-input multiple-output Orthogonal space-time block codes Precoding

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Generalized Spatial Modulation Based Hybrid Dimming Scheme for Visible Light Communication

Generalized Spatial Modulation Based Hybrid Dimming Scheme f...

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IEEE Global Conference on Communications (GLOBECOM) / Workshop on Wireless Networking and Control for UAV

作者： Wang, Tengjiao Yang, Fang Cheng, Ling Song, Jian Tsinghua Univ Beijing Natl Res Ctr Informat Sci & Technol BNRis Dept Elect Engn Beijing 100084 Peoples R China Tsinghua Univ Beijing Natl Res Ctr Informat Sci & Technol BNRis Res Inst Informat Technol Beijing 100084 Peoples R China Tsinghua Univ Shenzhen Key Lab Digital TV Syst Guangdong Prov & Shenzhen Res Inst Shenzhen 518057 Peoples R China Univ Witwatersrand Sch Elect & Informat Engn Johannesburg South Africa

ISBN: (纸本)9781538647271

Visible light communication (VLC) is regarded as one of the promising candidate to complement the conventional radio frequency communication as it can potentially perform communication and illumination simultaneously. Recently, VLC is combined with generalized spatial modulation (GenSM) technology to improve spectral and energy efficiencies. In order to provide high speed communication and flexible dimming control simultaneously, in this paper, a spectral-efficient GenSM based hybrid dimming scheme, which combines the spatial-domain and time-domain dimming strategies, is proposed for VLC. The channel capacity of the proposed scheme is analyzed and a closed-form expression of the upper bound of the channel capacity is derived. According to the required illumination level, the spatial-domain and time-domain strategies are realized based on the maximization of the channel capacity. Simulation results substantiate the superior performance of the proposed dimming scheme over state-of-art dimming schemes.

关键词： hybrid dimming control generalized spatial modulation channel capacity optimization multiple-input multiple-output

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Outage Performance of Dual-Hop MIMO AF Relaying with multiple Interferences 3

Outage Performance of Dual-Hop MIMO AF Relaying with Multipl...

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IEEE 3rd International Conference on Signal and Image Processing (ICSIP)

作者： Wang, Yan Li, Min Army Engn Univ PLA Inst China Elect Syst Engn Corp Nanjing Jiangsu Peoples R China Inst China Elect Syst Engn Corp Beijing Peoples R China

ISBN: (纸本)9781538663967

In this paper, we investigate the outage performance of a general dual-hop multiple-input multiple-output (MIMO) amplify-and-forward (AF) relay network, where the source, relay and destination are all equipped with multiple antennas. By considering maximal-ratio-transmission (MRT) and maximal-ratio combining (MRC) for the transmitter and receiver, respectively, we first obtain the output signal-to-interference-plus-noise ratio (SINR) of the dual-hop AF relay system with multiple co-channel interferences (CCIs) and noise at the relay. Then, we derive closed-form expressions of the outage probability (OP) for both the fixed-gain and variable-gain multi-antenna relaying systems. Finally, computer simulations are carried out to validate the performance analysis. Our new analytical expressions not only provide a fast and efficient method to evaluate the outage performance of the system, but also enable us to gain valuable insights into the effects of key parameters on the performance of the dual-hop AF relaying system benefit from implementing multiple antennas at each of the three nodes in the relaying network.

关键词： amplify-and-forward relaying multiple-input multiple-output dual-hop system co-channel inteferences outage probability

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Towards the Secrecy Outage Probability of Transmit-Receive Diversity Systems in the Presence of Multiantenna Eavesdroppers

Towards the Secrecy Outage Probability of Transmit-Receive D...

引用

作者： Piriya Wangnilrat Kiattisak Maichalernnukul College of Digital Innovation and Information Technology Rangsit University

We analyze the information-theoretic security of transmit-receive diversity systems in the presence of multiantenna eavesdroppers. Specifically, exact and asymptotic closed-form expressions are derived for the secrecy outage probability of such systems in a Rayleigh fading environment. Based on the latter expression, the corresponding secrecy diversity order and secrecy array gain are determined. Numerical results are presented to verify the analytical results and to investigate the impact of various system parameters, including the antenna configuration and the number of eavesdroppers.

关键词： multiple-input multiple-output transmit-receive diversity secrecy outage probability

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High Isolation Dual-Polarized Dielectric Resonator Antenna for MIMO LTE Applications

High Isolation Dual-Polarized Dielectric Resonator Antenna f...

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IEEE International Conference on Electro/Information Technology (EIT)

作者： Khan, Aftab Ahmad Jamaluddin, Mohd Haizal Qureshi, Muhammad Bilal Ali, S. M. Owais Jawad, Muhammad COMSATS Inst Informat Technol Dept Elect Engn Abbottabad Kpk Pakistan Univ Teknol Malaysia Fac Elect Engn Wireless Commun Ctr WCC Johar Bahru Malaysia COMSATS Inst Informat Technol Dept Elect Engn Lahore Punjab Pakistan

ISBN: (纸本)9781538653982

In this paper high isolation dual-polarized Dielectric Resonator Antenna (DRA) for multiple-input multiple-output (MIMO) Long Term Evolution (LTE) applications is designed and fabricated. High isolation more than 50 dB is achieved through Quasi-orthogonal modes at 2.6 GHz with hybrid feeding mechanism. Port 1 and port 2 excite TEX and TEY modes through microstrip feed line and coaxial probe, respectively. The proposed design is analyzed for distinct ground planes which demonstrate negligible effect on gain and S-parameters. Simulated and measured results reveal that the proposed design is appropriate for MIMO LTE terminals.

关键词： multiple-input multiple-output isolation dielectric resonator antenna modes

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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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Assessment of Pulse-Doppler Radar and Digital Beamforming Radar

Assessment of Pulse-Doppler Radar and Digital Beamforming Ra...

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International Conference on Communication, Devices and Networking (ICCDN)

作者： Tamang, Nima Donka Sur, Samarendra Nath Bera, Soumyasree Bera, Rabindranath Sikkim Manipal Univ Dept Elect & Commun Engn Rangpo Sikkim India

ISBN: (纸本)9789811079016;9789811079009

In radar domain, digital beamforming radar is evolving as a promising radar technology as compared to conventional pulse-Doppler radar. The design of PD radar and DBF radar is done by keeping all the design parameters same, and its performance is compared in this work. Needless to say that PD radar uses only analog systems but DBF radar uses digital systems. DBF radar's performance is high, as compared to PD radar because of the use of digital techniques and MIMO antennas. The difference in signal to clutter ratio is 5.23 dB, i.e., SNR of DBF radar is three times greater than PD radar. The only limitation of DBF radar is being the hardware complexity, due to the use of multiple transceivers at each element of an antenna array, resulting in increased cost, size, weight, and power of the overall system.

关键词： Pulse-Doppler radar Digital beamforming radar multiple-input multiple-output Constant false alarm rate Spread spectrum digital beamforming

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Large-capacity long-distance bidirectional wireless signal transmission at hybrid K- and W-band 12

Large-capacity long-distance bidirectional wireless signal t...

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Conference on Broadband Access Communication Technologies XII

作者： Li, Xinying Yu, Jianjun Georgia Inst Technol Atlanta GA 30332 USA Fudan Univ Key Lab Informat Sci Electromagnet Waves MoE Shanghai Peoples R China ZTE TX Inc Morristown NJ 07960 USA

ISBN: (数字)9781510616042

ISBN: (纸本)9781510616042

We summarize the enabling technologies for broadband millimeter-wave communication at W-band. These enabling technologies include photonics-aided broadband signal generation, high-spectral efficiency modulation format, multiple-input multiple-output (MIMO) reception, high gain antenna, optical and electrical multi-carrier modulation, antenna polarization multiplexing and multi-band multiplexing, advanced digital signal processing (DSP), and heterodyne detection. Based on these advanced technologies, we have realized over 400G wireless signal transmission and over 2.5-km wireless delivery with a bit rate up to 50Gb/s at W-band.

关键词： Millimeter-wave communication photonics-aided signal generation broadband multiple-input multiple-output digital signal processing heterodyne detection

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