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Exploring Coordinated Multipoint Beamforming Strategies for 5G Cellular

IEEE ACCESS 2014年 2卷 930-946页

作者： Schwarz, Stefan Rupp, Markus Vienna Univ Technol Inst Telecommun A-1040 Vienna Austria

Cellular networks are a central part of today's communication infrastructure. The global roll-out of 4G long-term evolution is underway, ideally enabling ubiquitous broadband Internet access. Mobile network operators, however, are currently facing an exponentially increasing demand for network capacity, necessitating densification of cellular base stations (keywords: small cells and heterogeneous networks) and causing a strongly deteriorated interference environment. Coordination among transmitters and receivers to mitigate and/or exploit interference is hence seen as a main path toward 5G mobile networks. We provide an overview of existing coordinated beamforming strategies for interference mitigation in broadcast and interference channels. To gain insight into their ergodic behavior in terms of signal to interference and noise ratio as well as achievable transmission rate, we focus on a simplified but representative scenario with two transmitters that serve two users. This analysis provides guidelines for selecting the best performing method depending on the particular transmission situation.

关键词： multiple-input multiple-output beamforming multiuser gains coordinated multipoint transmission ergodic transmission rate linear transceivers MMSE receiver

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Analytical Performance of Amplify-and-Forward MIMO Relaying with Orthogonal Space-Time Block Codes

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IEEE TRANSACTIONS ON COMMUNICATIONS 2010年第7期58卷 2147-2158页

作者： Dharmawansa, Prathapasinghe McKay, Matthew R. Mallik, Ranjan K. Hong Kong Univ Sci & Technol Dept Elect & Comp Engn Kowloon Hong Kong Peoples R China Indian Inst Technol Dept Elect Engn New Delhi 110016 India Hong Kong Univ Sci & Technol Ctr Wireless Informat Technol Kowloon Hong Kong Peoples R China

This paper considers orthogonal space-time block coded transmission for a multiple-input multiple-output channel (MIMO) with non-coherent amplify-and-forward (AF) relaying in Rayleigh fading. We first characterize the statistical properties of the instantaneous signal-to-noise ratio (SNR) at the destination, by deriving new exact closed form expressions for the moment generating function, cumulants, and first and second moments. These results show a reciprocity relationship between the number of antennas at the relay and destination. The probability density function and cumulative distribution function of the SNR are also derived for certain system configurations, and for various asymptotic regimes. We then investigate the system performance by presenting new analytical expressions for the symbol error rate, outage probability, amount of fading, as well as the diversity order and array gain. Our results indicate that the proposed scheme can achieve the maximum diversity order of the non-coherent AF MIMO relay channel.

关键词： Amplify-and-forward relaying multiple-input multiple-output orthogonal space-time block coding performance analysis

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Nonbinary ldpc-coded probabilistic shaping scheme for MIMO systems based on signal space diversity

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Digital Communications and Networks 2023年第3期9卷 779-787页

作者： Weimin Kang School of Information and Communication Engineering North University of ChinaTaiyuan030051China

This paper first describes a binary Low-Density Parity-Check(LDPC)-coded Probabilistic Shaping(PS)scheme for multiple-input multiple-output(MIMO)systems based on Signal Space Diversity(SSD).Second,a Nonbinary(NB)LDPC-coded PS scheme for MIMO systems based on SSD is *** first scheme can be used to obtain a shaping gain,whereas the second can also realize a coding *** theoretical average mutual information of the optimized rotated quadrature amplitude modulation constellations is analyzed and the simulated error per-formance with 22 and 44 MIMO schemes is *** theoretical average mutual information analysis and simulation results show that the proposed NB LDPC-coded PS scheme for MIMO systems based on SSD is reliable and robust,and is therefore suitable for future wireless communication systems.

关键词： Probabilistic shaping multiple-input multiple-output Signal space diversity Average mutual information

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Channel estimation and data detection for MIMO systems under spatially and temporally colored interference

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EURASIP JOURNAL ON APPLIED SIGNAL PROCESSING 2004年第5期2004卷 685-695页

作者： Song, Y Blostein, SD Queens Univ Dept Elect & Comp Engn Kingston ON K7L 3N6 Canada

The impact of interference on multiple-input multiple-output (MIMO) systems has recently attracted interest. Most studies of channel estimation and data detection for MIMO systems consider spatially and temporally white interference at the receiver. In this paper, we address channel estimation, interference correlation estimation, and data detection for MIMO systems under both spatially and temporally colored interference. We examine the case of one dominant interferer in which the data rate of the desired user could be the same as or a multiple of that of the interferer. Assuming known temporal interference correlation as a benchmark, we derive maximum likelihood (ML) estimates of the channel matrix and spatial interference correlation matrix, and apply these estimates to a generalized version of the Bell Labs Layered Space-Time (BLAST) ordered data detection algorithm. We then investigate the performance loss by not exploiting interference correlation. For a (5,5) MIMO system undergoing independent Rayleigh fading, we observe that exploiting both spatial and temporal interference correlation in channel estimation and data detection results in potential gains of 1.5 dB and 4 dB for an interferer operating at the same data rate and at half the data rate, respectively. Ignoring temporal correlation, it is found that spatial correlation accounts for about I dB of this gain.

关键词： multiple-input multiple-output interference channel estimation data detection

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A General Digital Predistortion Linearization Scheme for Hybrid Beamforming System

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IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY 2023年第1期72卷 654-663页

作者： Zhao, Linshan Wan, Shaojun Kang, Kai Feng, Weifeng Qian, Hua Chinese Acad Sci Shanghai Adv Res Inst Shanghai 201210 Peoples R China Univ Chinese Acad Sci Beijing 101408 Peoples R China

Hybrid beamforming multiple-input multiple-output (MIMO) system has attracted a lot of attention in recent years since it significantly reduces the hardware cost compared to the fully digital beamforming system. However, with hybrid beamforming, the one-to-one mapping between the radio frequency (RF) chain and the nonlinear power amplifier (PA) is destroyed. The PA nonlinearity cannot be compensated by conventional digital predistortion (DPD) algorithms. In this article, we propose a novel multiple-input DPD model for hybrid beamforming MIMO systems. An extra digital compensation block is introduced in the feedback path. With the feedback compensation block, the proposed DPD can linearize the PA output signal as well as the aggregated far-field signal. What is more, we propose a DPD estimation algorithm with much reduced complexity. Comparing to existing solutions, the proposed scheme achieves satisfactory performance for hybrid beamforming system. It does not rely on the measurement of the channel or the assumption of massive antennas. Simulation results demonstrate the effectiveness of the proposed DPD scheme.

关键词： Digital predistortion hybrid beamforming multiple-input multiple-output multiple-input nonlinear model power amplifier

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Effect of Wiring and Cabling Topologies on the Performance of Distributed MIMO OFDM VLC Systems

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IEEE ACCESS 2019年 7卷 52743-52754页

作者： Narmanlioglu, Omer Kizilirmak, Refik Caglar Miramirkhani, Farshad Safaraliev, Sadi Sait, Sadiq M. Uysal, Murat Ozyegin Univ Dept Elect & Elect Engn TR-34794 Istanbul Turkey Nazarbayev Univ Dept Elect & Comp Engn Astana 010000 Kazakhstan Nestel Elect Co TR-45030 Manisa Turkey King Fahd Univ Petr & Minerals Ctr Commun & IT Res Res Inst Dhahran 31261 Saudi Arabia

Since most indoor spaces have multiple luminaires for illumination, for visible light communication (VLC) systems, multiple-input multiple-output (MIMO) communication emerges as a natural solution to improve the data rates and/or the link reliability. The existing works on MIMO VLC systems, however, overlook the characteristics of the lighting infrastructure and the luminaire design, which might have implications for the VLC system design. A luminaire typically consists of multiple LED chips. The wiring topology refers to how the LED chips are connected within the luminaire. The cabling topology, on the other hand, refers to how the luminaires are connected to the communication access point (AP). Based on the type and length of cabling and wiring, significant delays can be introduced, which should be taken into account in channel modeling. In this paper, we adopt the non-sequential ray tracing to model the distributed MIMO VLC channels for various practical wiring and cabling topologies. Based on the developed channel models, we provide a comparative performance analysis of repetition coding (RC), spatial multiplexing (SMUX), and spatial modulation (SMOD) MIMO modes. Our results quantify the effect of wiring/cabling delays and provide insights into the optimized design of lighting infrastructure and luminaires for the support of VLC as an add-on service.

关键词： Visible light communication multiple-input multiple-output OFDM channel modeling cabling delay

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Efficient Detection for Improving ASEP Performance of MIMO Composite Fading Channel with Generalized Noise

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WIRELESS PERSONAL COMMUNICATIONS 2018年第3期98卷 2913-2923页

作者： Tiwari, Keerti Saini, Davinder S. Bhooshan, Sunil V. Jaypee Univ Informat Technol Dept Elect & Commun Engn Solan 173234 HP India Chandigarh Coll Engn & Technol Dept Elect & Commun Engn Chandigarh 160019 India

multiple-input multiple-output (MIMO) system has achieved significant benefits by applying optimum detection techniques. Maximum likelihood (ML) detection technique improves the error rate performance of MIMO system at optimum level but with enhanced complexity. Therefore, we have considered minimum mean square error-ordered successive interference cancellation with candidate detection to approach the performance of ML with reduced complexity. The proposed system performance is analyzed in composite Weibull-gamma fading and additive white generalized Gaussian noise (AWGGN) scenario. Some special cases of WG fading and AWGGN yield the simplified results.

关键词： multiple-input multiple-output Maximum likelihood Minimum mean square error-ordered successive interference cancellation with candidate Additive white generalized Gaussian noise

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Blind identification of space–time block codes based on deep learning

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Chinese Journal of Aeronautics 2022年第1期35卷 426-435页

作者： Limin ZHANG Yuyuan ZHANG Wenjun YAN Ling MA Institute of Information Fusion Naval Aeronautical UniversityYantai 264001China Coastal Defense College Naval Aeronautical UniversityYantai 264001China

Deep Learning(DL)has important applications to both commercial and military communications,such as software-defined radio,cognitive radio and spectrum *** DL has been intensively studied for modulation recognition,there are very few investigations for blind identification of Space-Time Block Codes(STBCs).This paper proposes a Residual Network(RN)-based model for identifying 6 kinds of STBC signals with a single receiving antenna,including the same length of coding *** our work,we use the frequency-domain correlation function of a single time delay as the training data of DL ***,we explore the suitable RN structure for blind identification of ***,we compare the RN model with convolutional neural network and traditional method,and test the performance of RN *** results show that our RN-based model provides good performance with low sensitivity to decay of the dataset,such as sample length and data *** the same time,better identification accuracy can be achieved under the condition of different modulation types and channel fading parameters at low Signal to Noise Ratio(SNR).

关键词： Blind identification Deep learning multiple-input multiple-output Residul network Space-time block code

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On the Exact Distribution of Mutual Information of Two-User MIMO MAC Based on Quotient Distribution of Wishart Matrices

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EURASIP JOURNAL ON WIRELESS COMMUNICATIONS AND NETWORKING 2017年第1期2017卷 1-13页

作者： Pivaro, Gabriel Kumar, Santosh Fraidenraich, Gustavo State Univ Campinas Unicamp Dept Commun Campinas SP Brazil Shiv Nadar Univ Dept Phys Gautam Buddha Nagar Uttar Pradesh India

We propose an exact calculation of the probability density function (PDF) and cumulative distribution function (CDF) of mutual information (MI) for a two-user multiple-input multiple-output (MIMO) multiple access channel (MAC) network over block Rayleigh fading channels. This scenario can be found in the uplink channel of MIMO non-orthogonal multiple access (NOMA) system, a promising multiple access technique for 5G networks. So far, the PDF and CDF have been numerically evaluated since MI depends on the quotient of two Wishart matrices, and no closed form for this quotient was available. We derive exact results for the PDF and CDF of extreme (the smallest/the largest) eigenvalues. Based on the results of quotient ensemble, the exact calculation for PDF and CDF of mutual information is presented via Laplace transform approach and by direct integration of joint PDF of quotient ensemble's eigenvalues. Furthermore, our derivations also provide the parameters to apply the Gaussian approximation method, which is comparatively easier to implement. We show that approximation matches the exact results remarkably well for outage probability, i.e., CDF, above 10%. However, the approximation could also be used for 1% outage probability with a relatively small error. We apply the derived expressions to investigate the effects of adding antennas in the receiver and its ability to decode the weak user signal. By supposing no channel knowledge at transmitters and successive decoding at receiver, the capacity of the weak user increases and its outage probability decreases with the increment of extra antennas at the receiver end.

关键词： multiple access channel multiple-input multiple-output Non-orthogonal multiple access Mutual information Outage probability Rayleigh fading Wishart matrices Quotient ensemble Extreme eigenvalues Gap probabilities

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Low-Complexity Sorted QR Decomposition for MIMO Systems Based on Pairwise Column Symmetrization

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IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS 2014年第3期13卷 1388-1396页

作者： Kim, Tae-Hwan Korea Aerosp Univ Sch Elect Telecommun & Comp Engn Goyang Si 412791 Gyung Gi Do South Korea

QR decomposition (QRD) is a preprocessing technique for detecting symbols in multiple-input and multiple-output (MIMO) systems, but the computational complexity is prohibitively high when the systems incorporate a large number of antennas. This paper presents a low-complexity sorted QRD (SQRD) algorithm for MIMO systems. The proposed algorithm performs SQRD through orthogonalizations based on the modified Gram-Schmidt process, rearranging the column vectors of a real-valued MIMO channel matrix in such a way that the symmetry between the vectors is maintained. By using the symmetry, the computations required for orthogonalizing one of the two adjacent vectors can be eliminated effectively, which significantly reduces the computational complexity. Theoretical analyses show that the proposed algorithm reduces the computational complexity required for SQRD by 50% for any MIMO configurations, when compared to the conventional algorithm. In addition, the memory requirement to store resultant matrices is 50% of that in the conventional one.

关键词： multiple-input multiple-output QR decomposition sphere decoding symbol detection preprocessing Gram-Schmidt process

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