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An Improved SIC-Based Detection Scheme for Non-Uniform Constellations in ATSC 3.0 MIMO

IEEE TRANSACTIONS ON BROADCASTING 2022年第2期68卷 286-294页

作者： Kim, Hyeongseok Kim, Jeongchang Park, Sung-Ik Hur, Namho Korea Maritime & Ocean Univ Dept Elect & Commun Engn Interdisciplinary Major Maritime AI Convergence Busan 49112 South Korea Elect & Telecommun Res Inst Media Transmiss Res Grp Daejeon 34129 South Korea

This paper presents an alternative approach to real-valued signal representation and proposes an improved successive interference cancellation (SIC)-based detection scheme using the alternative signal representation for non-uniform constellations (NUCs) in Advanced Television Systems Committee (ATSC) 3.0. Since I/Q polarization interleaving in ATSC 3.0 multiple-input multiple-output (MIMO) precoding performs a non-linear operation, it makes it difficult to use conventional suboptimal detection schemes based on interference cancellation. Therefore, the alternative signal representation is designed to easily apply various suboptimal detection schemes. Further, to obtain more robustness and lower complexity, a suboptimal detection scheme based on the alternative signal representation and interference cancellation with QR decomposition is proposed. The proposed detection scheme exploits the structural properties of NUCs and jointly detects the real and imaginary parts as a block. In addition, by considering one or more candidate symbols in the interference cancellation for the proposed detection scheme, the performance and the complexity are trade-offs according to the number of the considering candidate symbols. Simulation results show that the proposed detection scheme with a slight increase of the complexity significantly outperforms a linear detection under fixed and mobile channels.

关键词： MIMO communication Interference cancellation Complexity theory Codes Maximum likelihood decoding Robustness Quadrature amplitude modulation Advanced television systems committee 3 0 multiple-input multiple-output real-valued representation suboptimal decoding successive interference cancellation

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A Scalable Framework for CSI Feedback in FDD Massive MIMO via DL Path Aligning

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IEEE TRANSACTIONS ON SIGNAL PROCESSING 2017年第18期65卷 4702-4716页

作者： Luo, Xiliang Cai, Penghao Zhang, Xiaoyu Hu, Die Shen, Cong ShanghaiTech Univ Sch Informat Sci & Technol Shanghai 201210 Peoples R China Fudan Univ Sch Informat Sci & Technol Shanghai 200433 Peoples R China Univ Sci & Technol China Hefei 230022 Peoples R China

Unlike the time-division duplexing systems, the down-link (DL) and uplink (UL) channels are not reciprocal in the case of frequency-division duplexing (FDD). However, some long-term parameters, e.g., the time delays and angles of arrival of the channel paths, enjoy reciprocity. In this paper, by efficiently exploiting the aforementioned limited reciprocity, we address the DL channel state information (CSI) feedback in a practical wideband massive multiple-input multiple-output system operating in the FDD mode. With orthogonal frequency-division multiplexing waveform and assuming frequency-selective fading channels, we propose a scalable framework for the DL pilots design, DL CSI acquisition, and the corresponding CSI feedback in the UL. In particular, the base station (BS) can transmit the FFT-based pilots with carefully selected phase shifts. Then, the user can rely on the so-called time-domain aggregate channel to derive the feedback of reduced dimensionality according to either its own knowledge about the statistics of the DL channels or the instruction from the serving BS. We demonstrate that each user can just feed back one scalar number per DL channel path for the BS to recover the DL CSIs. Comprehensive numerical results further corroborate our designs.

关键词： multiple-input multiple-output MIMO massive MIMO frequency-division duplexing FDD time-division duplexing TDD channel state information CSI feedback TDD reciprocity aligning pilots

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Performance analysis for low-complexity detection of MIMO V2V communication systems

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COMPUTER NETWORKS 2018年 140卷 92-100页

作者： Li, Guoquan Zhou, Ying Bai, Tong Lin, Jinzhao Pang, Yu Wu, Wei Din, Sadia Jeon, Gwanggil Chongqing Univ Posts & Telecommun Chongqing Peoples R China Sichuan Univ Chengdu Sichuan Peoples R China Kyungpook Natl Univ Sch Comp Sci & Engn Daegu South Korea Incheon Natl Univ Incheon South Korea

In Vehicle-to-Vehicle (V2V) communication, the rapid movement of vehicles brings fast attenuation of signal propagation and serious shift effect of Doppler frequency, leading to serious transmission performance deterioration. multiple-input multiple-output (MIMO) technique can be well applied in V2V communication by exploiting diversity and multiplexing gain to improve the system reliability and increase the data rate. In an MIMO system, the achieved diversity and multiplexing gain is closely related to its detection method. Integer-Forcing (IF) detection is one of the linear detections proposed in recent years. Compared to the traditional linear and Maximum Likelihood (ML) detection, IF has a good tradeoff between the complexity and system performance. In this paper, considering its good detection performance, IF is applied to the detection of a MIMO V2V communication system and the performance is further analyzed theoretically by employing Alamouti code at the transmitters. The diversity gain proves to be full and is confirmed by the simulation results. (C) 2018 Elsevier B.V. All rights reserved.

关键词： V2V communication multiple-input multiple-output Low-complexity detection Performance analysis

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Generalized Framework for the Analysis of Linear MIMO Transmission Schemes in Decentralized Wireless Ad Hoc Networks

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IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS 2012年第8期11卷 2815-2827页

作者： Wu, Yueping Louie, Raymond H. Y. McKay, Matthew R. Collings, Iain B. Hong Kong Univ Sci & Technol Dept Elect & Comp Engn Kowloon Hong Kong Peoples R China Univ Sydney Sch Elect & Informat Engn Ctr Excellence Telecommun Sydney NSW 2006 Australia CSIRO ICT Ctr Wireless Technol Lab Epping NSW 1710 Australia

We develop a general framework for the analysis of a broad class of point-to-point linear multiple-input multiple-output (MIMO) transmission schemes in decentralized wireless ad hoc networks. New general closed-form expressions are derived for the outage probability, throughput and transmission capacity. For the throughput, we investigate the optimal number of data streams in various asymptotic regimes, which is shown to be dependent on different network parameters. For the transmission capacity, we prove that it scales linearly with the number of antennas, provided that the number of data streams also scales linearly with the number of antennas, in addition to meeting some mild technical conditions. We also characterize the optimal number of data streams for maximizing the transmission capacity. To make our discussion concrete, we apply our general framework to investigate three popular MIMO schemes, each requiring different levels of feedback. In particular, we consider eigenmode selection with MIMO singular value decomposition, multiple transmit antenna selection, and open-loop spatial multiplexing. Our analysis of these schemes reveals that significant performance gains are achieved by utilizing feedback under a range of network conditions.

关键词： multiple-input multiple-output ad hoc networks throughput transmission capacity feedback

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Iterative Receivers for Downlink MIMO-SCMA: Message Passing and Distributed Cooperative Detection

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IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS 2018年第5期17卷 3444-3458页

作者： Yuan, Weijie Wu, Nan Guo, Qinghua Li, Yonghui Xing, Chengwen Kuang, Jingming Beijing Inst Technol Sch Informat & Elect Beijing 100081 Peoples R China Univ Wollongong Sch Elect Comp & Telecommun Engn Wollongong NSW 2522 Australia Univ Sydney Sch Elect & Informat Engn Ctr Excellence Telecommun Sydney NSW 2006 Australia

The rapid development of mobile communications requires even higher spectral efficiency. Non-orthogonal multiple access (NOMA) has emerged as a promising technology to further increase the access efficiency of wireless networks. Among several NOMA schemes, it has been shown that sparse code multiple access (SCMA) is able to achieve better performance. In this paper, we consider a downlink MIMO-SCMA system over frequency selective fading channels. For optimal detection, the complexity increases exponentially with the product of the number of users, the number of antennas and the channel length. To tackle this challenge, we propose near optimal low-complexity iterative receivers based on factor graph. By introducing auxiliary variables, a stretched factor graph is constructed and a hybrid belief propagation (BP) and expectation propagation (EP) receiver, named stretch-BP-EP, is proposed. Considering the convergence problem of BP algorithm on loopy factor graph, we convexify the Bethe free energy and propose a convergence-guaranteed BP-EP receiver, named conv-BP-EP. We further consider cooperative network and propose two distributed cooperative detection schemes to exploit the diversity gain, namely, belief consensus-based algorithm and the Bregman alternative direction method of multipliers (ADMM)-based method. Simulation results verify the superior performance of the proposed conv-BP-EP receiver compared with other methods. The two proposed distributed cooperative detection schemes can improve the bit error rate performance by exploiting the diversity gain. Moreover, Bregman ADMM method outperforms the belief consensus-based algorithm in noisy inter-user links.

关键词： Sparse code multiple access multiple-input multiple-output belief propagation expectation propagation variational free energy distributed cooperative detection

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DESIGN OF A BROADBAND PLANAR MONOPOLE MIMO ANTENNA

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MICROWAVE AND OPTICAL TECHNOLOGY LETTERS 2014年第9期56卷 1994-1997页

作者： Kazim, Jalil Ur Rehman Ahmad, Salman Ali, Usman Owais, Owais COMSATS Inst Informat Technol Abbottabad Dept Elect Engn Abbottabad Pakistan

A broadband multiple-input multiple-output antenna with a size of 60 x 120 x 1.6 mm is presented for the smart phones. Enhanced performance of the antenna is achieved by utilizing dual radiator chopping and ground plane slitting. Supplemental L-shaped meandered ground structure over the top of radiator was added to enhance the performance in the lower frequency band. The proposed antenna covers two frequency bands for return loss <-6 dB, that is, 0.8-0.96 and 1.7-2.7 GHz, respectively, specified for mobile phone operation. The antenna is fabricated and measured results are obtained for return loss, isolation, envelope correlation, and radiation pattern. (C) 2014 Wiley Periodicals, Inc.

关键词： multiple-input multiple-output broadband UWB LTE

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Antenna Diversity for Downlink MIMO-NOMA Systems With Partial Channel State Information

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IEEE COMMUNICATIONS LETTERS 2018年第10期22卷 2172-2175页

作者： Gong, Ming-yan Yang, Zhen Lyu, Bin Nanjing Univ Posts & Telecommun Key Lab Broadband Wireless Commun & Sensor Networ Minist Educ Nanjing 210003 Jiangsu Peoples R China

In this letter, antenna diversity is used to improve the outage performance of downlink multiple-input multiple-output non-orthogonal multiple access systems with partial channel state information, of which the transmitter only knows the distance and channel direction information associated with each user. We analyze the ergodic rate and the outage probability of the proposed system. Moreover, we derive the closed-form expression of each user's outage probability. Numerical results confirm the accuracy of our analysis.

关键词： Antenna diversity multiple-input multiple-output non-orthogonal multiple access partial channel state information

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Composite Fading Model for Aerial MIMO FSO Links in the Presence of Atmospheric Turbulence and Pointing Errors

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IEEE WIRELESS COMMUNICATIONS LETTERS 2021年第6期10卷 1295-1299页

作者： Khallaf, Haitham S. Kato, Kazutoshi Mohamed, Ehab Mahmoud Sait, Sadiq M. Yanikomeroglu, Halim Uysal, Murat Egyptian Atom Energy Author Nucl Res Ctr Inshas 13759 Egypt Kyushu Univ Grad Sch Informat Sci & Elect Engn Fukuoka 8190395 Japan Prince Sattam Bin Abdulaziz Univ Coll Engn Wadi Aldwaser 11991 Saudi Arabia Aswan Univ Fac Engn Elect Engn Dept Aswan 81542 Egypt King Fahd Univ Petr & Minerals Comp Engn Dept Dhahran 31261 Saudi Arabia Carleton Univ Dept Syst & Comp Engn Ottawa ON K1S 5B6 Canada Ozyegin Univ Dept Elect & Elect Engn TR-34794 Istanbul Turkey

In this letter, we introduce accurate approximation expressions for composite fading channel model and outage probability of multiple-input multiple-output (MIMO) free space optical (FSO) link between two unmanned aerial vehicles (UAVs) in hovering state. In our derivations, we consider the effects of weather attenuation, random fluctuations in UAVs' positions and orientations, and atmospheric turbulence. Our proposed model is unified with respect to turbulence effect, which means it is valid for different atmospheric turbulence models. We show the accuracy of the proposed model through comparisons with Monte Carlo simulations under different channel conditions.

关键词： Atmospheric turbulence free space optical communications multiple-input multiple-output pointing errors unmanned aerial vehicles

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A NOVEL CIRCULARLY POLARIZED MODIFIED SLOT MIMO ANTENNA FOR WLAN APPLICATIONS

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MICROWAVE AND OPTICAL TECHNOLOGY LETTERS 2017年第4期59卷 876-880页

作者： Ghahremani, M. Ghobadi, Ch Nourinia, J. Karamirad, M. Mohammadi, B. Urmia Univ Dept Elect Engn Orumiyeh Iran

The design of a novel circularly polarized (CP) modified slot multiple-input multiple-output (MIMO) antenna for WLAN applications with a small size of 20 x 20 mm(2) is suggested. The MIMO antenna configuration consists of two stepped open-circuit feed-lines to enhance the input matching condition, a square ground plane with circularly etching and two arc-shape slotted stubs along the two opposite edges to produce the CP functionality. To accredit the simulation results, the prototypes of the suggested CP modified slot MIMO antenna are constructed on an inexpensive FR-4 substrate and tested. The outcomes exhibit a 6% (330 MHz, 5.10-5.43 GHz) 3dB axial-ratio bandwidth, and the measured 10-dB impedance bandwidth is 62.9% (4720 MHz, 4,92-9.64 GHz). Antenna feed-lines are Microstrip-Microstrip to gain a high isolation and low envelope correlation between the two input ports. Fine efficiency of the propounded antenna over the working bands are also received. The outcomes demonstrate, which the antenna can be evaluated as a suitable choice for CP MIMO systems. (C) 2017 Wiley Periodicals, Inc.

关键词： circularly polarized multiple-input multiple-output slot antenna WLAN

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Precoder Design for MIMO Visible Light Communications With Decision-Feedback Receivers

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IEEE PHOTONICS TECHNOLOGY LETTERS 2019年第7期31卷 521-524页

作者： Zhai, Yanrong Tong, Jun Xi, Jiangtao Hangzhou Dianzi Univ Sch Commun Engn Hangzhou 310018 Zhejiang Peoples R China Univ Wollongong Sch Elect Comp & Telecommun Wollongong NSW 2522 Australia

Decision-feedback equalization is considered for point-to-point multiple-input multiple-output visible light communication systems. Based on the geometric mean decomposition (GMD) and uniform channel decomposition (UCD), two precoders under the signal non-negativity and total average power constraints are designed for such systems. The GMD scheme can decompose the channel into multiple parallel sub-channels with equal gains. The UCD scheme further improves performance through power allocation. Simulation results of bit-error-rate and capacity are presented. It is shown that the proposed schemes can outperform conventional linear designs and the UCD scheme performs better than the GMD scheme.

关键词： Visible light communication multiple-input multiple-output uniform channel decomposition geometric mean decomposition decision feedback equalization

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