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

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Novel Unified Analysis of Orthogonal Space-Time Block Codes over Generalized-K and AWGGN MIMO Networks 81

Novel Unified Analysis of Orthogonal Space-Time Block Codes ...

引用

81st IEEE Vehicular Technology Conference (VTC Spring)

作者： Salahat, Ehab Saleh, Hani Khalifa Univ Sci Technol & Res Abu Dhabi U Arab Emirates

ISBN: (纸本)9781479980888

This paper presents a novel unified performance analysis of Space-Time Block Codes (STBCs) operating in the multiple input multiple output (MIMO) network. Specifically, we derive a novel unified expression for the average bit error rate for all coherent modulation schemes assuming independent and identically distributed generalized-K fading channels, which accounts for both multipath fading and shadowing, and modeled via the Nakagami-m distribution and the gamma distributions, respectively. The noise model in the network is assumed to be an Additive White Generalized Gaussian Noise (AWGGN), which encompasses the Laplacian and the Gaussian noise environments as special cases. The derived expression obviates the need to recalculate the diversity of various receivers for many fading and noise models in a piecemeal fashion. Published results from the literature as well as numerical integration methods corroborate the accuracy of the unified expression.

关键词： Space-Time Block Codes Generalized-K multiple-input multiple-output Additve White Generalized Gaussian Noise Rayleigh-Lognormal ABER

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The First Study of MIMO Scheme Within Rolling-shutter Based Optical Camera Communications 12

The First Study of MIMO Scheme Within Rolling-shutter Based ...

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12th International Symposium on Communication Systems, Networks and Digital Signal Processing (CSNDSP)

作者： Teli, Shivani Rajendra Matus, Vicente Zvanovec, Stanislav Perez-Jimenez, Rafael Vitek, Stanislav Ghassemlooy, Zabih Czech Tech Univ Dept Electromagnet Field Prague 16627 Czech Republic ULPGC IDeTIC Las Palmas Gran Canaria Spain Czech Tech Univ Dept Radio Engn Prague 16627 Czech Republic Northumbria Univ Opt Commun Res Grp Newcastle Upon Tyne Tyne & Wear England

ISBN: (纸本)9781728167435

In this paper, we propose the first study of MIMO (multiple-input multiple-output) scheme using a simplified design of MIMO transmitter (Tx) based on grouping of lightemitting diodes (LED) within an array for flicker-free transmission in optical camera based communications (OCC) link. We carried out an initial experimental investigation of indoor static downlink OCC using a Raspberry Pi camera as the receiver with rolling-shutter capturing mode and a 7.2 cm similar to 7.2 cm small 64-neopixel LED array as the Tx. The initial study suggests that, despite the small area of the display, communication links from 20 up to 60 cm can be established.

关键词： Optical camera communications internet of things multiple-input multiple-output rolling shutter lightemitting diodes

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On the Degrees of Freedom Regions of Two-User MIMO Z and Full Interference Channels with Reconfigurable Antennas

On the Degrees of Freedom Regions of Two-User MIMO Z and Ful...

引用

IEEE Global Telecommunications Conference (GLOBECOM 2010)

作者： Ke, Lei Wang, Zhengdao Iowa State Univ Dept ECE Ames IA 50011 USA

ISBN: (纸本)9781424456383

We study the degrees of freedom (DoF) regions of two-user multiple-input multiple-output (MIMO) Z and full interference channels in this paper. We assume that the receivers always have perfect channel state information. We derive the DoF region of Z interference channel with channel state information at transmitter (CSIT). For full interference channel without CSIT, the DoF region has been obtained in previous work except for a special case M-1 < N-1 < min(M-2, N-2), where M-i and N-i are the number of transmit and receive antennas of user i, respectively. We show that for this case the DoF regions of the Z and full interference channels are the same. We establish the achievability based on the assumption of transmitter antenna mode switching. A systematic way of constructing the DoF-achieving nulling and beamforming matrices is presented in this paper.

关键词： Degrees of freedom region Z interference channel interference channel multiple-input multiple-output

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OTA-Based Data Acquisition and Signal Separation for Digital Predistortion of Multi-User MIMO Transmitters in 5G

OTA-Based Data Acquisition and Signal Separation for Digital...

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IEEE/MTT-S International Microwave Symposium (IMS)

作者： Wang, Xiaoyu Li, Yue Yu, Chao Hong, Wei Zhu, Anding Univ Coll Dublin RF & Microwave Res Grp Dublin Ireland Southeast Univ State Key Lab Millimeter Wave Nanjing Peoples R China

ISBN: (纸本)9781728168159

In this paper, a non-interruptive over-the-air (OTA) data acquisition method is presented to characterize system nonlinearity and calibrate digital predistortion (DPD) in multi-user (MU) multiple-input multiple-output (MIMO) transmitters with low hardware complexity. Based on a unified system model for fully-digital and hybrid MU-MIMO transmitters, the requirements and difficulties of data acquisition for MU-MIMO DPD are outlined first. A versatile OTA data acquisition technique, featuring a multi-observation forward modelling procedure, is thereby developed to obtain power amplifier (PA) output without interrupting the operation of the MIMO transmitters. By using this method, the output of each PA can be reconstructed instead of directly measuring each PA's output, even when the output signals of PAs are correlated. DPD can therefore be effectively constructed to mitigate the distortion. Experimental results demonstrate that the proposed approach can accurately estimate each PA output and linearize all PAs in the array.

关键词： 5G digital predistortion multiple-input multiple-output multi-user over-the-air

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Double regularization approach to iterative blind multispectral image restoration - art. no. 67870L

Double regularization approach to iterative blind multispect...

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5th International Symposium on Multispectral Image Processing and Pattern Recognition

作者： Chen, Li Wang, Changjie Wuhan Univ Sci & Technol Sch Comp Sci Wuhan 430065 Peoples R China

ISBN: (纸本)9780819469519

In this paper, we present a new iterative blind multispectral image restoration algorithm based on double regularization (DR). The motivation for DR when applied to multispectral restoration lies in its effectiveness towards edge preservation in joint blur identification and image restoration. With consideration for both the intra- and inter-channel blurring function in the multiple-input multiple-output (MIMO) systems, an alternating minimization (AM) procedure with conjugate gradient optimization (CGO) scheme is formulated to implement restoration iteratively. The derivation of DR optimization shows that optimal restoration result can be achieved even when the MIMO systems suffer from interchannel interference. Experimental results show that it is effective in performing blind mutichannel restoration when applied to color images.

关键词： blind image deconvolution multispectral restoration double regularization multiple-input multiple-output

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Development of MIMO Scheme-based Optical Camera Communication System using Deep Learning method 5

Development of MIMO Scheme-based Optical Camera Communicatio...

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5th International Conference on Artificial Intelligence in Information and Communication (ICAIIC)

作者： Nguyen, Van Linh Tran, Duc Hoang Nguyen, Huy Chung, ByungDeok Jang, Yeong Min Kookmin Univ Dept Elect Engn Seoul 136702 South Korea ENS Co Ltd Ansan 15655 South Korea

ISBN: (纸本)9781665456456

The Internet of Things (IoT), satellite communication, and other communication systems that utilize radio frequency waveforms frequently use modern wireless communication technologies. Wireless communication provides benefits over conventional communication due to its simple installation. One of the most well-known of them is Optical Camera Communication (OCC) technology, which has several advantages, including no negative effects on human health, good security, and inexpensive operating expenses. In this paper, we offer a multiple-input multiple-output modulation method that uses deep learning (DL) to recognize light-emitting diodes and predict thresholds while considering mobility assistance and long-distance communication into considerations. Our suggested strategy employs DL algorithms to enhance the performance of the traditional camera on-off keying (C-OOK) scheme by reducing bit error rate, communication distance, and data rate.

关键词： deep learning optical camera communication multiple-input multiple-output

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MIMO Channel Estimation Algorithm Using Complete Complementary Sequence 2

MIMO Channel Estimation Algorithm Using Complete Complementa...

引用

2nd IEEE International Conference on Computer and Communications (ICCC)

作者： Li Shufeng Zeng Jiabao Commun Univ China Sch Informat & Engn Beijing Peoples R China

ISBN: (纸本)9781467390262

multiple-input multiple-output (MIMO) channel estimation algorithm is proposed in this paper. A pilot scheme that uses complete complementary sequence (CCS) with complete orthogonality (the sidelobes of the auto-correlation function and cross-correlation function equals zero for all time shifts) was investigated in order to eliminate the mutual interference between multiple antennas. The channel estimation performance under the normalized mean square error sense (NMSE) based on CCS is derived. Results from simulated data, the efficiency and validity of the CCS applied in MIMO channel estimation are proved. The CCS opens up a new direction for channel estimation in the future wireless communication systems. Compared with traditional pilot scheme in the frequency domain, the proposed channel estimation algorithms in the time domain need not matrix inversion which can reduce the computational complexity. In contrast to the complementary pilot mode, CCS-based channel estimation acquired much more flexible configuration in selection of transmitter antenna number. At the same time, compared with the pilot sequence based on m sequence, the channel estimation performance is improved by using the orthogonality of the CCS.

关键词： complete complementary sequence multiple-input multiple-output channel estimation

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Implementation of Sphere Decoder with Early Termination using FPGA

Implementation of Sphere Decoder with Early Termination usin...

引用

International Conference on Signal Processing and Communication (ICSC)

作者： Chauhan, Abha Mehra, Rajesh NITTTR Chandigarh India

ISBN: (纸本)9781479916054

Sphere Decoding (SD) algorithm has emerged as a highly effective detection scheme for multiple-input multiple-output (MIMO) systems. It offers a near maximum likelihood accuracy with reduced complexity. Despite this, there is a constant demand of even low complexity SD algorithms. This paper presents the FPGA implementation of Schnorr-Euchner SD algorithm with Early Termination (ET) scheme for uncoded multiple-input multiple output system. The ET scheme reduces the complexity of the decoder. The proposed decoder is designed for 4x4 Binary Phase Shift Keying (BPSK) MIMO system. The trade-off between the Bit Error Rate (BER) performance and the computational complexity is discussed. To compute the computational complexity synthesis of the proposed design is done on Xilinx Virtex 5 XC5VLX30T and Spartan 6 XC6SLX25T. An exhaustive comparison on the basis of resources utilized and frequency (MHz) at which the design can run is done on both the FPGAs.

关键词： Sphere Decoder Maximum likelihood detector multiple-input multiple-output Schnorr-Euchner algorithm Early Termination Field Programmable Gate Array Bit Error Rate

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Multiband Antenna with Indoor Applications Using Soft Computation Method

Multiband Antenna with Indoor Applications Using Soft Comput...

引用

Conference on Intelligent Computing, Information and Control Systems (ICICCS)

作者： Kalaiarasan, K. Kavitha, A. Swaminathan, J. N. Vel Tech Rangarajan Dr Sagunthala R&D Inst Sci & Chennai Tamil Nadu India Vel Tech Multi Tech Dr Rangarajan Dr Sakunthala E Chennai Tamil Nadu India Godavari Inst Engn & Technol Rajahmundry Andhra Pradesh India

ISBN: (纸本)9783030304652;9783030304645

To improve the state-of-art data transferring in wireless indoor devices, it is necessary to have an integrated multiple-input multiple-output (MIMO). This paper proposes a fully defined MIMO antenna system for 4G, 5G and wireless LAN networks (WLAN) to obtain high data rate transfer. The integrated MIMO antenna system is able to transfer signals for the frequency of 5 GHz for 5G standards, 13 GHz for future 5G mm-wave band and 2.4 GHz for Wireless LAN network. The design of the antenna system is aimed to achieve more than 5dBi of directivity with an efficiency greater than 60%.

关键词： multiple-input multiple-output Multiband antenna

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MIMO OFDM Index Modulation with Circular-Shift-based Activation Pattern for Rapidly Time-Varying Channels 83

MIMO OFDM Index Modulation with Circular-Shift-based Activat...

引用

IEEE 83rd Vehicular Technology Conference (VTC Spring)

作者： Yao, Fangchao Zheng, Jianping Li, Zhenzhou Xidian Univ State Key Lab Integrated Serv Networks Xian Peoples R China

ISBN: (纸本)9781509016983

In this paper, the extension of the orthogonal frequency division multiplexing (OFDM) index modulation (IM) from single-antenna systems to multiple-antenna systems is studied. And a multiple-input multiple-output (MIMO) OFDM IM scheme with circular-shift-based activation pattern is proposed for the rapidly time-varying (RTV) channel. In the proposed scheme, the IM is applied in the joint antenna and sub-carrier dimension. Concretely, a constructive generation method of the IM pattern matrix based on the circular shift of a sparse column vector is presented, which makes the frequency-domain signal is sparse in both antenna and sub-carrier dimensions. The performance of the proposed scheme in the RTV channel is demonstrated by computer simulations.

关键词： multiple-input multiple-output orthogonal frequency division multiplexing index modulation rapidly time-varying channel

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