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

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Experimental Evaluation of Open-Loop Precoding MIMO Using the Testbed Targeted at IMT-Advanced System

Experimental Evaluation of Open-Loop Precoding MIMO Using th...

引用

19th IEEE International Symposium on Personal, Indoor and Mobile Radio Communications

作者： Hatakawa, Yasuyuki Miyazaki, Noriaki Suzuki, Toshinori KDDI R&D Labs Inc Saitama Japan

ISBN: (纸本)9781424426430

This paper presents an experimental evaluation of open-loop precoding MIMO (multiple input multiple output) using a testbed targeted at IMT-Advanced systems. Open-loop MIMO is realized by applying Rotational OFDM (R-OFDM), that is previously proposed by authors, to MIMO transmission. MIMO R-OFDM is more robust with respect to correlated channels than conventional open-loop MIMO-OFDM, because it optimizes the distances between the constellation points using simple phase rotation. The angle of phase rotation depends on the modulation orders and coding rate, hence the receiver does not need to feed the CSI (Channel State Information) back to the transmitter. In this paper, MIMO R-OFDM is implemented in a testbed targeted at IMT-Advanced systems, it is then evaluated experimentally and by computer simulations. The results of the evaluation reveal that MIMO R-OFDM is effective in correlated channels, and the gain in terms of the CIR (Carrier to Interference Ratio) with respect to conventional MIMO OFDM to achieve PER (Packet Error Rate) = 0.01 is about 1.5 dB when MIMO R-OFDM is used in correlated channels.

关键词： Correlated Channel Experimental Evaluation multiple-input multiple-output IMT-Advanced

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Design of a Frequency Selective Surface Backed Wideband Sub-6 GHz band MIMO Antenna with High Isolation for 5G Applications 2

Design of a Frequency Selective Surface Backed Wideband Sub-...

引用

2nd International Conference on Sustainable Computing and Smart Systems (ICSCSS)

作者： Pradeep, Pendli Raju, A. Ramakrishna Sanjana, Veludandi Sainithin, Miriyala Rao, S. P. V. Subba Sreenidhi Inst Sci & Technol Autonomous Dept Elect & Commun Engn Hyderabad India

ISBN: (纸本)9798350391558;9798350379990

In this paper, a stub-loaded 2-port MIMO antenna is introduced for applications across the n77 (3.30-4.20 GHz), n78 (3.30-3.80 GHz), n79 (4.40-5.00 GHz), Wi-Fi-5 (5.15-5.85 GHz), and 7-7.83 GHz bands. It comprises a microstrip line feed, a two-port stub-loaded MIMO antenna, and an FSS (frequency selective surface) filter. The antenna designed with dimensions of 37.5 x 32 mm(2) on an FR-4 epoxy substrate PCB with a thickness of 1.6 mm. The FSS structure contains 16 circular vertex square- shaped unit cells arranged in a 4x4 array, with a size of 50 x 50 x 1.6 mm(3), and due to stub and FSS loading, gain, bandwidth, and isolation improved significantly. The design process utilizes the ANSYS HFSS tool, and the antenna operates within the frequency ranges of 3.36-5.76 GHz and 7-7.83 GHz. Moreover, the isolation value achieves a minimum of -18 dB and -15 dB for nearly simulated and measured results across the entire band. Peak gain reaches a maximum of 6 dBi and a minimum of 3.35 dBi due to FSS loading. Radiation patterns exhibit high directivity at lower and higher frequencies and nearly omnidirectional behavior at middle frequencies, attributed to the passband filter characteristics of the FSS. The MIMO diversity parameters ECC and CCL are verified to be within acceptable limits. This innovative antenna can envisaged for sub-6 GHz band 5G applications.

关键词： Frequency Selective Surface multiple-input multiple-output Isolation sub-6 GHz 5G band

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Opportunistic Spectrum Sharing Strategy for Heterogeneous MIMO system

Opportunistic Spectrum Sharing Strategy for Heterogeneous MI...

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International Conference on Automation, Communication, Architectonics and Materials

作者： Zhang, Lei Hao, Ying Beijing Univ Civil Engn & Architecture Beijing Peoples R China

ISBN: (纸本)9783037851036

Dynamic spectrum sharing in cognitive radio networks is an open research issue. This paper propose, a limited feedback opportunistic spectrum sharing (LFOSS) technique for heterogeneous multiple-input multiple-output (MIMO) uplink system based on the concept learning automata. Simulation results show that our proposed algorithm can substantially improve the average mutual information of each secondary user under the interference temperature constraint and the maximum data substream constraint compared to the random selection scheme.

关键词： Cognitive radio Heterogeneous networks multiple-input multiple-output Limited feedback opportunistic spectrum sharing

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Cost-Efficient VBI-Based Multiuser Detection for Uplink Grant-Free MIMO-NOMA 99

Cost-Efficient VBI-Based Multiuser Detection for Uplink Gran...

引用

IEEE 99th Vehicular Technology Conference (VTC-Spring)

作者： Yang, Boran Zhang, Xiaoxu Hao, Li Karagiannidis, George K. Quan, Xin Dobre, Octavia A. Southwest Jiaotong Univ Chengdu Peoples R China Aristotle Univ Thessaloniki Thessaloniki Greece Lebanese Amer Univ Beirut Lebanon Mem Univ St John NL Canada

ISBN: (纸本)9798350387414

Grant-free non-orthogonal multiple access (GF-NOMA) based on multiple-input multiple-output (MIMO) has attracted much attention as a promising technique to support massive connectivity and bursty data transmission in massive machine-type communication. In this paper, we propose two compressed sensing based multiuser detection (MUD) algorithms for the MIMO-enabled GF-NOMA system. First, the spatially enhanced variational Bayesian inference (SE-VBI) algorithm is developed for MUD by exploiting the Gaussian mixture prior and diversity combining technique. Then, by applying the covariance-free (CoFe) strategy to the SE-VBI framework to estimate the diagonal elements of the posterior covariance, we propose a low-complexity MUD method named SE-CoFe-VBI. In particular, the proposed algorithms integrate the multivariate nature of the transmitted signal, i.e., discreteness, sparsity, and spatial correlation. Simulation results show that the proposed algorithms offer improved detection performance over the state-of-the-art spatially enhanced sparse Bayesian learning method.

关键词： Grant-free non-orthogonal multiple access multiple-input multiple-output Gaussian mixture prior variational Bayesian inference covariance-free

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A 4 x 4 MIMO Discrete Multitone Wireline Transceiver With Far-End Crosstalk Cancellation For ADC-Based High-Speed Serial Links

A 4 x 4 MIMO Discrete Multitone Wireline Transceiver With Fa...

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IEEE International Symposium on Circuits and Systems (ISCAS)

作者： Lee, Jaewon Jang, Seoyoung Choi, Yujin Kim, Donggeon Braendli, Matthias Kossel, Marcel Ruffino, Andrea Morf, Thomas Francese, Pier -Andrea Kim, Gain Daegu Gyeongbuk Inst Sci & Technol DGIST Daegu South Korea IBM Res Europe Ruschlikon Switzerland

ISBN: (纸本)9798350330991;9798350331004

This paper presents an area- and energy-efficient 4-lane far-end crosstalk (FEXT) cancellation wireline transceiver (TRX) with a multiple-input multiple-output (MIMO) discrete multitone (DMT) modulation. The channel estimation (CHEST) is an essential block for DMT TRX to find the MIMO equalizer coefficients at the receiver (RX) side. However, due to the high computational complexity, the matrix inversion in CHEST hinders the generalization to larger MIMO, such as 4x4, considering circuit implementation. In this work, we show that CHEST can be effectively approximated to an element-wise reciprocal instead of an inversion when some properties of the wireline channels are used as constraints. This approximation also simplifies the MIMO equalizer circuit and realizes a decentralized MIMO. Simulation results demonstrated that the FEXT noise from adjacent lanes is sufficiently canceled out even with our approximated CHEST and MIMO equalizer, achieving a symbol error rate (SER) of 2E-4 for communicating over a channel exhibiting insertion loss (IL) of 16 dB and 17 dB of IL-to-crosstalk ratio at Nyquist, while showing SER of 1e-1 when the FEXT is not canceled.

关键词： ADC-based serial link wireline transceiver discrete multitone DMT far-end crosstalk FEXT multiple-input multiple-output MIMO matrix inversion

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ENVIRONMENTAL MONITORING WITH THE IMAGING MIMO RADARS MIRA-CLE AND MIRA-CLE X 30

ENVIRONMENTAL MONITORING WITH THE IMAGING MIMO RADARS MIRA-C...

引用

IEEE International Geoscience and Remote Sensing Symposium

作者： Klare, Jens Saalmann, Olaf Wilden, Helmut Brenner, Andreas R. Fraunhofer Inst High Frequency Phys & Radar Tech D-53343 Wachtberg Germany

ISBN: (纸本)9781424495665

Several applications need imaging sensors for environmental monitoring which can continuously observe an area in a 24/7 mode independently from the weather and other atmospheric obscuration like dust and smoke. Imaging MIMO radar fulfills these requirements and enables the opportunity of low-cost and robust imaging systems by synthesizing many virtual antennas out of just a few real ones. MIRA-CLE is a fully configurable and expandable experimental MIMO radar in Ka-band while MIRA-CLE X works in X-band and is intended to be a low-cost experimental system for long range applications. This paper presents both MIMO radar systems and shows and discusses first imaging results of MIRA-CLE X.

关键词： MIMO multiple-input multiple-output MIMO radar MIMO SAR Imaging radar

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Transmit Antenna Selection Strategies in Correlated Fading MIMO Channels

Transmit Antenna Selection Strategies in Correlated Fading M...

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5th International Conference on Wireless Communications, Networking and Mobile Computing

作者： Wang Jun Chen Hong Deng Shaoping Yao Zhoushi Xian Inst Space Radio Technol Natl Key Lab Space Microwave Technol Xian Peoples R China

ISBN: (纸本)9781424436927

This paper studies the performance of transmit antenna selection algorithms in spatially correlated fading MEMO channels. The antenna subset is selected based on maximizing the channel capacity. A novel method is proposed to select the optimum set of transmit antennas based on the upper bound on the mean channel capacity. The proposed method based only on the fading correlation and not the instantaneous channel realization. And also its computational complexity is low and tends to be realized. The simulation results show that antenna selection of transmitter can increase the channel capacity of MIMO system by 1 bit/s in a flat fading environment with a rank deficient channel.

关键词： multiple-input multiple-output Channel Capacity Antenna Selection Spatial Correlation

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IMAGING OF FMCW MIMO RADAR WITH INTERLEAVED OFDM WAVEFORM 12

IMAGING OF FMCW MIMO RADAR WITH INTERLEAVED OFDM WAVEFORM

引用

12th IEEE International Conference on Signal Processing (ICSP)

作者： Cheng, Pu Wang, Zhan Xin, Qin He, Mi Natl Univ Def Technol Coll Elect Sci & Engn Changsha Hunan Peoples R China Third Mil Med Univ Sch Biomed Engn Chongqing Peoples R China

ISBN: (纸本)9781479921867

A novel scheme of the Frequency-Modulated Continuous-Wave Synthetic Aperture Radar (FMCW SAR) with multiple orthogonal transmitted waveforms is introduced in this paper. Based on the Interleaved Orthogonal Frequency Division multiplex (I-OFDM) principle, the transmit waveform successfully combines the advantages of the linear frequency modulated waveform and the OFDM waveform. This maintains FMCW SAR system smart and miniature, with lower cross correlation and higher coherence. Instead of band pass filter for traditional frequency division waveform, the division of the novel waveform is performed efficiently by the demodulation using discrete Fourier transform. At last, to verify the novel scheme, a simulation of imaging of one point is performed with two transmit waveform.

关键词： Frequency-Modulated Continuous-Wave radar multiple-input multiple-output Orthogonal Waveform Design Interleaved OFDM Synthetic Aperture Radar

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The performance analysis for the spatial correlated MIMO systems in V2V

The performance analysis for the spatial correlated MIMO sys...

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URSI Asia-Pacific Radio Science Conference (URSI AP-RASC)

作者： Park, Myung Chul Han, Dong Seog Kyungpook Natl Univ Sch Elect Engn Deagu South Korea

ISBN: (纸本)9781467388016

This paper analyzes the reception performance of the double space-time transmit diversity (DSTTD) with spatial modulation (SM) in vehicle-to-vehicle (V2V) channel. The DSTTD-SM scheme improves the performance of spectral efficiency and reception in V2V environments. The conventional multi-input multi-output (MIMO) schemes are also analyzed in the view of the antenna correlated channel and the spectral efficiency. And the simulation results shows DSTTD-SM scheme has better performance than conventional MIMO schemes in V2V channels which have Rician channel properties with correlation between transmit antennas and Doppler effects.

关键词： Spatial modulation multiple-input multiple-output vehicle-to-vehicle

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Power Allocation Algorithm of Optical MIMO NOMA Visible Light Communications 9

Power Allocation Algorithm of Optical MIMO NOMA Visible Ligh...

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IEEE 9th International Conference on Electronics Information and Emergency Communication (ICEIEC)

作者： Liu, Xiaoyi Yu, Hongyi Zhu, Yijun Zhang, Erfeng Natl Digital Switching Syst Engn & Technol Res Ct Zhengzhou Henan Peoples R China

ISBN: (纸本)9781728111902

Visible light communication (VLC) is a promising technique in future networks due to its advantages of high data rate and licensed-free spectrum. In this paper, we apply the non-orthogonal multiple access (NOMA) technique to improve the achievable sum rate of multipleinput multiple-output (MIMO)-based multi-user visible light communication (VLC) systems. To ensure efficient and low complexity power allocation in indoor MIMO-NOMA-based VLC systems, a normalized gain difference power allocation (NGDPA) method is first proposed by exploiting users' channel conditions. We investigate the performance of an indoor 2x2 MIMO-NOMA based multi-user VLC system through numerical simulations. The obtained results show that the achievable sum rate of the 2x2 MIMO-VLC system can be significantly improved by employing NOMA with the proposed NGDPA method. It is demonstrated that NOMA with NGDPA achieves a sum rate improvement of up to 29.1% compared with NOMA with the gain ratio power allocation method in the 2 x 2 MIMO-VLC system with three users.

关键词： visible light communication multiple-input multiple-output non-orthogonal multiple access power allocation

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