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

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Minimum Distance Based Precoding for Closed-Loop QO-STBC Systems with Single-Symbol Decodable ML Receiver

Minimum Distance Based Precoding for Closed-Loop QO-STBC Sys...

引用

IEEE Computing, Communications and IT Applications Conference (IEEE ComComAp)

作者： Kim, Jaesin Ryu, Junghun Kim, Suil Pak, Ui-Young Agcy Def Dev R&D Inst 1 2 Taejon 300600 South Korea

ISBN: (纸本)9781467360449;9781467360432

In this paper, we proposes a new minimum distance based precoding scheme for closed-loop quasi-orthogonal space-time block code (QO-STBC) systems. By utilizing the minimum Euclidean distance maximizing criterion, the proposed scheme attains the near-optimal symbol error performance, while allowing lower feedback overhead. In addition, the proposed scheme still guarantees a simple maximum likelihood detection (called single-symbol decodable). Simulation results verify that our proposed approach provides further gains compared to the conventional closed-loop systems.

关键词： multiple-input multiple-output minimum Euclidean distance closed-loop QO-STBC

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End-to-End Hybrid Beamforming for mmWave Integrated Access and Backhaul with Active Sensing Strategy 25

End-to-End Hybrid Beamforming for mmWave Integrated Access a...

引用

IEEE Wireless Communications and Networking Conference (IEEE WCNC)

作者： Lin, Sisi Xu, Xiaoxia Chen, Qimei Zhang, Zihan Wen, Dingzhu Tao, Guocao Jiang, Hao Wuhan Univ Sch Elect Informat Wuhan 430072 Peoples R China Futian Dist Ind & Commerce Dev Promot Ctr Shenzhen 518000 Peoples R China ShanghaiTech Univ Sch Informat Sci & Technol Shanghai 201210 Peoples R China Wuhan Fiberhome Tech Serv Wuhan 430072 Peoples R China Fiberhome Commun Technol Wuhan 430072 Peoples R China

ISBN: (纸本)9798350303582;9798350303599

The effectiveness of Millimeter Wave full-duplex (FD) Integrated Access and Backhaul (IAB) system relies on high-dimensional channel estimation with high computational complexity. To avoid high-overhead pilot training, we propose a novel low-complexity end-to-end (E2E) hybrid beamforming strategy for FD mmwave IAB systems using implicit channel state information (CSI). Particularly, the IAB node first dynamically senses spatial channels, where an sensing Transformer block is introduced to actively design the sensing vector. The active sensing strategy can effectively handle the sequential pilot observations with an arbitrary input length. Capitalizing on the implicit channel features extracted by the Transformer, a hybrid beamforming neural network (HBFnet) is further exploited to design the hybrid precoder/combiner of IAB node, thus efficiently mitigating SI while compensating channel fading. Simulation results demonstrate that the proposed scheme outperforms the benchmarks, especially with low pilot overheads.

关键词： Integrated Access and Backhaul multiple-input multiple-output Hybrid beamforming Deep learning Transformer

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Physical Layer Security Optimization for MIMO Enabled Visible Light Communication Networks

Physical Layer Security Optimization for MIMO Enabled Visibl...

引用

IEEE Global Communications Conference (GLOBECOM)

作者： Xu, Zheng Chen, Ming Chen, Mingzhe Yang, Zhaohui Cang, Yihan Poor, H. Vincent Southeast Univ Natl Mobile Commun Res Lab Nanjing Peoples R China Southeast Univ Sch Cyber Sci & Engn Nanjing Peoples R China UCL Dept Elect & Elect Engn London England Princeton Univ Dept Elect & Comp Engn Princeton NJ 08544 USA

ISBN: (纸本)9781728181042

This paper investigates the optimization of physical layer security in multiple-input multiple-output (MIMO) enabled visible light communication (VLC) networks. In the considered model, one transmitter equipped with light-emitting diodes (LEDs) intends to send confidential messages to legitimate users while one eavesdropper attempts to eavesdrop on the communication between the transmitter and legitimate users. This security problem is formulated as an optimization problem whose goal is to minimize the sum mean-square-error (MSE) of all legitimate users while meeting the MSE requirement of the eavesdropper thus ensuring the security. To solve this problem, the original optimization problem is first transformed to a convex problem using successive convex approximation. An iterative algorithm with low complexity is proposed to solve this optimization problem. Simulation results show that the proposed algorithm can reduce the sum MSE of legitimate users by up to 40% compared to a conventional zero forcing scheme.

关键词： Physical layer security visible light communication multiple-input multiple-output transceiver design

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Capacity Maximization in Wireless MIMO Networks with Receiver-Side Interference Suppression 14

Capacity Maximization in Wireless MIMO Networks with Receive...

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15th ACM International Symposium on Mobile Ad Hoc Networking and Computing

作者： Wan, Peng-Jun Xu, Boliu Frieder, Ophir Ji, Sai Wang, Baowei Xu, Xiaohua IIT Dept Comp Sci Chicago IL 60616 USA Georgetown Univ Dept Comp Sci Washington DC 20057 USA Nanjing Univ IST Coll Comp & Software Nanjing 210044 Jiangsu Peoples R China Univ Toledo EECS Dept Toledo OH 43606 USA

ISBN: (纸本)9781450326209

multiple-input multiple-output (MIMO) technology provides a means of boosting network capacity without requiring additional spectrum. It has received widespread attention over the past decade from both industry and academic researchers,no w forming a key component of nearly all emerging wireless standards. Despite the huge promise and considerable attention,a rigorous algorithm-theoretic framework for maximizing network capacity in multihop wireless MIMO networks is missing in the state of the art. The existing algorithms and protocols for maximizing network capacity in multihop wireless MIMO networks are purely heuristic without any provable performance guarantees. In this paper we conduct a comprehensive algorithm study for maximizing network capacity in multihop wireless MIMO networks with receiver-side interference suppression,including the full characterization of NP-hardness and APX-hardness, the polynomial time approximation schemes,and the practical approximation algorithms with provable performance guarantees.

关键词： Capacity multiple-input multiple-output stream scheduling

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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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Diversity-multiplexing tradeoff in cooperative multiple access channels

Diversity-multiplexing tradeoff in cooperative multiple acce...

引用

IEEE International Conference on Communications (ICC 2007)

作者： Ding, Zhiguo Ratnarajah, T. Cowan, Colin Queens Univ Belfast ECIT Belfast BT3 9DT Antrim North Ireland

ISBN: (纸本)9781424403523

Cooperative transmission schemes can offer benefits in terms of diversity and multiplexing gain compared with conventional direct transmission by forming a virtual antenna array. In this paper, a spectrally efficient strategy is proposed for cooperative multiple access channels in a centralized communication environment with N users. With help of superposition coding, the deteriorating effect of cooperative communication on the data rate is effectively suppressed since relaying transmission does not consume extra channel use. By carefully categorizing the outage events, the diversity-multiplexing tradeoff can be obtained, which shows that the proposed strategy can achieve optimal tradeoff for multiplexing gains 0 <= r <= 1 whereas the compared cooperative scheme is only optimal for 0 <= r <= 1/N.

关键词： cooperative transmission diversity-multiplexing tradeoff capacity multiple-input multiple-output

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A Low Complexity Soft-input Soft-output Fixed-Complexity Sphere Decoding Algorithm

A Low Complexity Soft-Input Soft-Output Fixed-Complexity Sph...

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8th International Conference on Wireless Communications, Networking and Mobile Computing (WiCOM)

作者： Chen, Xi Li, Jiangpeng Ma, Jun Wang, Junfeng He, Guanghui Shanghai Jiao Tong Univ Sch Microelect Shanghai 200030 Peoples R China Panovel Technol Corp Shanghai Peoples R China

ISBN: (纸本)9781612846835;9781612846828

By exchanging soft information between the detector and the channel decoder, an iterative receiver can significantly improve the performance compared to the non-iterative receiver. In this paper, a low complexity soft-input soft-output (SISO) fixed-complexity sphere decoding (FSD) algorithm is proposed for iterative MIMO receiver. The algorithm introduces a simplified parallel candidate adding (SPCA) scheme to provide more accurate soft information. Furthermore, by employing our proposed improved hybrid-enumeration method, the SISO-FSD can reduce the computational complexity substantially. Simulation results show that the algorithm can achieve a near Max-Log optimal maximum a posteriori (MAP) detection performance under flat fading Rayleigh channels. Compared to the SISO K-Best algorithm (K=50), the proposed algorithm saves about 60% computations and provides almost the same performance for detecting 4 x 4 64-QAM MIMO signal, making it a promising scheme for real-life hardware implementation.

关键词： multiple-input multiple-output soft-input soft-output detection fixed complexity sphere decoding

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Deterministic MIMO channel simulation model for wireless multicarrier communications

Deterministic MIMO channel simulation model for wireless mul...

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Conference on Asia-Pacific Optical and Wireless Communication (APOC 2002)

作者： Wu, G Tang, YX Li, SQ Univ Elect Sci & Technol China Natl Commun Lab Chengdu 610054 Peoples R China

ISBN: (纸本)0819447005

In this paper we present a deterministic approach of modeling wideband MIMO (multiple-input multiple-output) radio fading channel for wireless multicarrier systems. Implementation problem of downlink MIMO model for mobile station (MS) was first investigated, while space-time coding or downlink beam-forming is taken into count at base station (BS). The MIMO channel are determined by both power azimuth profile (PAP) at MS and various configuration of multiple antennas at BS. Based on tap-delay-line structure and deterministic fading channel modeling method, SIMO fading model, corresponding to any one transmitter antenna, is formed by generating doppler phase difference between two receiver antenna aided by PAP at MS. The von Mises probability density function was adopted to characterize phenomenon of nonisotropic scattering components around MS. The ultimate MIMO channel simulation model is sum of all SIMO channel with all transmitter antennas. Finally, we predicted MIMO channel capacity based on proposed simulation model with parameters of wireless multicarrier systems under specified "Vehicular A channel" of ITU-R M.1225.

关键词： multiple-input multiple-output antenna array transmit diversity radio channel model

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Non-Regenerative Multi-Hop MIMO Relays Using MMSE-DFE Technique

Non-Regenerative Multi-Hop MIMO Relays Using MMSE-DFE Techni...

引用

IEEE Global Telecommunications Conference (GLOBECOM 2010)

作者： Rong, Yue Curtin Univ Technol Dept Elect & Comp Engn Bentley WA 6102 Australia

ISBN: (纸本)9781424456383

In this paper, we study multi-hop non-regenerative multiple-input multiple-output (MIMO) relay communications with any number of hops. We design the optimal source precoding matrix and the optimal relay amplifying matrices for such relay network where a nonlinear decision feedback equalizer (DFE) based on the minimal mean-squared error (MMSE) criterion is used at the destination node. We show that when the composite objective function is Schur-convex, the MMSE-DFE receiver together with the optimal source and relay matrices enable an arbitrary number of source symbols to be transmitted at one time, and yield a significantly improved performance compared with non-regenerative MIMO relay systems using linear receivers at the destination.

关键词： MIMO communication MMSE-DFE technique Schur-convex decision feedback equalisers decision feedback equalizer least mean squares methods minimal mean-squared error multi-hop MIMO relays multiple-input multiple-output optimal source relay matrices

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Recent Trends in Coherent Free-Space Optical Communications 4

Recent Trends in Coherent Free-Space Optical Communications

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Conference on Metro and Data Center Optical Networks and Short-Reach Links IV

作者： Zhang, Chao Uyama, Kota Zhang, Zheyuan Jin, Lei Set, Sze Yun Yamashita, Shinji Glick, Madeleine Srivastava, Atul K. Akasaka, Youichi Univ Tokyo Res Ctr Adv Sci & Technol Meguro Ku 4-6-1 Komaba Tokyo 1538904 Japan

ISBN: (数字)9781510642607

ISBN: (纸本)9781510642607

Free-space optical communication is a line-of-sight wireless communication scheme, which is preferred for its number of prime advantages over radio frequency wireless communication, such as no spectrum licensing, large bandwidth, inherent security, electromagnetic compatibility/electromagnetic interference immunity etc. Moreover, free-space optical communication also benefits from low-cost installation and maintenance. It has been studied for the next generation access networks, inter-building connections, ground-to-unmanned aerial vehicle links, underwater communication applications, inter-satellite links, deep space links etc. Among various detection approaches utilized in free-space optical communication, coherent detection can achieve the best sensitivity in a bandwidth-limited condition, effectively demodulate optical multilevel coded signals to attain high spectral e i-ciency, offer excellent background noise rejection. However, such an attractive free-space optical communication suffer from waveform distortion, scintillation, phase fluctuations etc. after transmission in atmospheric channels. Its link losses are almost dependent on atmospheric effects and climatic conditions. In this article, we present an up-to-date survey on coherent free-space optical communication, the atmospheric turbulent effects especially the impacts of turbulence in free-space optical links, and countermeasures against such impairments.

关键词： 6G free-space optical communication atmospheric turbulence scintillation wavefront distortion coherent detection thresholding multiple-input multiple-output space-time block coding adaptive optics relay latency

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