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检索条件"主题词=Linear precoding"

共 343 条记录，以下是311-320 订阅

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Joint Interference Alignment and Bi-Directional Scheduling for MIMO Two-Way Multi-Link Networks

Joint Interference Alignment and Bi-Directional Scheduling f...

引用

IEEE International Conference on Communications (ICC)

作者： Fouladgar, A. M. Simeone, O. Sahin, O. Popovski, P. Shamai (Shitz), S. New Jersey Inst Technol CWCSPR Newark NJ 07102 USA InterDigital Inc Melville NY 11747 USA Aalborg Univ Dept Elect Syst Aalborg Denmark Technion Israel Inst Technol Dept Elect Engn IL-32000 Haifa Israel

ISBN: (纸本)9781467364324

By means of the emerging technique of dynamic Time Division Duplex (TDD), the switching point between uplink and downlink transmissions can be optimized across a multi-cell system in order to reduce the impact of inter-cell interference. It has been recently recognized that optimizing also the order in which uplink and downlink transmissions, or more generally the two directions of a two-way link, are scheduled can lead to significant benefits in terms of interference reduction. In this work, the optimization of bi-directional scheduling is investigated in conjunction with the design of linear precoding and equalization for a general multi-link MIMO two-way system. A simple algorithm is proposed that performs the joint optimization of the ordering of the transmissions in the two directions of the two-way links and of the linear transceivers, with the aim of minimizing the interference leakage power. Numerical results demonstrate the effectiveness of the proposed strategy.

关键词： MIMO Two-way communications Scheduling Interference alignment linear precoding

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Downlink Performance of Massive MIMO under General Channel Aging Conditions 58

Downlink Performance of Massive MIMO under General Channel A...

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IEEE Global Telecommunications Conference (GLOBECOM)

作者： Papazafeiropoulos, Anastasios K. Imperial Coll London Commun & Signal Proc Grp London England

ISBN: (纸本)9781479959525

Massive multiple-input multiple-output (MIMO) is a promising technology aiming at achieving high spectral efficiency by deploying a large number of base station (BS) antennas using coherent combining. Channel aging due to user mobility is a significant degrading factor of such systems. In addition, cost efficiency of massive MIMO is a prerecuisite for their deployment, that leads to low cost antenna elements inducing high phase noise. Since phase is time-dependent, it contributes to channel aging. For this reason, we present a novel joint channel-phase noise model, that enables us to study the downlink of massive MIMO with maximum ratio transmission (MRT) precoder under these conditions by means of the deterministic equivalent of the achievable sum-rate. Among the noteworthy outcomes is that the degradation due to user mobility dominates over the effect of phase noise. Nevertheless, we demonstrate that the joint effects of phase noise and user mobility do not degrade the power scaling law 1/root M (M is the number of BS antennas), as has been established in massive MIMO systems with imperfect channel state information.

关键词： Channel estimation Doppler shift phase noise massive MIMO linear precoding

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Addressing Wireless Network Capacity Challenges: A Novel Mobile System with WOLA and NOMA 6

Addressing Wireless Network Capacity Challenges: A Novel Mob...

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6th International Conference on Computer and Informatics Engineering, IC2IE 2023

作者： Ibrahim, Sarmad K. Abdulhussien, Saif A. Hadi, Israa Salih College of Engineering Mustansiriyah University Department of Computer Engineering Baghdad Iraq College of Engineering Mustansiriyah University Department of Electrical Engineering Baghdad Iraq

ISBN: (纸本)9798350345162

The downlink multi-user precoding of the multiple-input multiple-output (MIMO) approach includes the ideal channel state information at the base station and various linear precoding (LP) techniques. However, in high-speed situations, the 5G orthogonal frequency division multiplexing (OFDM) and precoding techniques have weaknesses. The Doppler effect causes frequency shifts, breaking the orthogonality of OFDM subcarriers and reducing their throughput output and bit error rate (BER). To address this issue and improve the performance of a 5G system, the novel architecture proposed in this study combines non-orthogonal multiple access (NOMA) and weighted overlap and add (WOLA) techniques. The system's optimal throughput and BER performance are evaluated through practical scenarios. The results from this novel system demonstrate a remarkable performance boost compared to a conventional system, including significant MIMO enhancements and achieving the best BER and throughput. The suggested approach offers a throughput that is approximately 24 % higher than that of conventional systems. Additionally, it increases the BER by about 2% compared to the 5G model. © 2023 IEEE.

关键词： 5G linear precoding massive MIMO NOMA WOLA

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Walsh-Hadamard-Fourier Transform Based OFDM with Space-Multipath Diversity

Walsh-Hadamard-Fourier Transform Based OFDM with Space-Multi...

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IEEE International Conference of Region 10 (TENCON)

作者： Ouyang, Xing Jin, Guiyue Jin, Jiyu Wang, Zhisen Dalian Polytech Univ Sch Informat Sci & Engn Dalian 116034 Liaoning Peoples R China

ISBN: (纸本)9781479928255;9781479928279

Walsh-Hadamard-Fourier transform based orthogonal frequency division multiplexing (WHFT-OFDM) is an efficient linearly precoded OFDM system to exploit multipath diversity in the frequency selective fading channel. This paper proposes a WHFT-OFDM scheme with space-multipath diversity by using the cyclic delay diversity (CDD) technique which deliberately introduces delayed echoes at transmitter to enhance the diversity gain of WHFT-OFDM. Moreover, the proposed WHFT-OFDM system provides an efficient way to implement the multicarrier code division multiple access for multiuser systems;its maximum multipath diversity, which is equal to the number of resolvable paths from the channels, is analyzed. Simulations are provided to validate the advantages of the proposed scheme.

关键词： Walsh-Hadamard-Fourier transform MC-CDMA multipath diversity linear precoding

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Transmission Pattern Selection for Relay Communication with Distributed Space-Time Codes

Transmission Pattern Selection for Relay Communication with ...

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11th IEEE Singapore International Conference on Communication Systems

作者： Whang, Roderick Jaehoon Liu, Huaping Hong, Een Kee Oregon State Univ Sch EECS Corvallis OR 97331 USA Kyung Hee Univ Dept Radio Commun Engn Kyeonggi Do South Korea

ISBN: (纸本)9781424424238

We propose an efficient space-time coded cooperative relay communications scheme that employs linear precoding and transmission-pattern selection. If effectively exploited, distributed spatial diversity and the cooperative nature of multihop communications could significantly increase the coverage area of a wireless network that consists of a number of power-limited relay nodes. We build upon an existing block linear precoding technique for conventional multiple-input multiple-output systems studied in to improve the diversity performance of a multihop, relay network. We propose a distributed-relay-selection algorithm to maximize the signal-to-noise ratio at the receiver. We show, via simulation, that the proposed pattern-selection scheme with precoding outperforms the conventional space-time coded relay system using quasi-orthogonal space-time block codes by over 2 dB at a bit error rate of 10(-3).

关键词： Multihop relay cooperative communications space-time block codes linear precoding distributed relay terminal selection

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Cluster Precoders for Cell-Free MU-MIMO Systems

Cluster Precoders for Cell-Free MU-MIMO Systems

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International Symposium on Wireless Communication Systems (ISWCS)

作者： Flores, Andre R. de Lamare, Rodrigo C. Mishra, Kumar Vijay Pontifical Catholic Univ Rio de Janeiro Ctr Telecommun Studies Rio De Janeiro Brazil Univ York Dept Elect Engn York N Yorkshire England US DEVCOM Army Res Lab Adelphi MD 20783 USA

ISBN: (数字)9781665455442

ISBN: (纸本)9781665455442

Cell-free (CF) multiple-input multiple-output systems employ distributed access points (APs) to enhance their performance. In the downlink, CF systems resort to precoding techniques to overcome multiuser interference. However, network-wide precoders incur high computational and signaling costs that cannot be afforded by practical systems. Therefore, we develop user-centric precoders that use clusters of APs for downlink transmission. The clusters are formed by employing the large-scale fading coefficients between users and APs. An antenna selection policy is proposed to define the clusters of APs. Different from other techniques, we also employ a user selection matrix to restrict which users are taken into account in the computation of the precoder. Two major benefits emerge from the proposed approach. First, the computational cost is reduced because several channel estimates are unnecessary. Second, the computational complexity of the precoder is reduced by restricting the number of users, which leads to matrices with reduced size. Closed-form expressions to compute the sum-rate of the proposed precoders are derived. Numerical results demonstrate that our approach can attain more than 90% of the network-wide precoders performance, while offering lower costs.

关键词： Cell-free systems ergodic sum rate linear precoding MIMO multiuser interference

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Vector Coded Caching Greatly Enhances Massive MIMO 23

Vector Coded Caching Greatly Enhances Massive MIMO

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23rd International Workshop on Signal Processing Advances in Wireless Communication (SPAWC)

作者： Zhao, Hui Bazco-Nogueras, Antonio Elia, Petros EURECOM Commun Syst Dept F-06410 Sophia Antipolis France IMDEA Networks Inst Madrid 28918 Spain

ISBN: (数字)9781665494557

ISBN: (纸本)9781665494557

The use of vector coded caching has been shown to provide important gains and, more importantly, to alleviate the impact of the file-size constraint, which prevents coded caching from obtaining its ideal gains in practical settings. In this work, we analyze the performance of vector coded caching in the massive MIMO regime, aiming at understanding the benefits that allowing users to cache a practical amount of data could bring to realistic settings in such massive MIMO regime. In particular, we separately consider two linear precoding schemes and analyze the corresponding throughput, for which we derive simple but precise upper and lower bounds. These bounds enable us to characterize the delivery speed-up gain over the uncoded caching setting when the CSI acquisition costs are taken into account. Numerical results demonstrate the tightness of the derived bounds and show a significant boost over uncoded caching and the standard cacheless setting.

关键词： Coded caching linear precoding massive MIMO

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Adaptive Minimum-Distance Based Precoder for NB-LDPC Coded MIMO Transmission 58

Adaptive Minimum-Distance Based Precoder for NB-LDPC Coded M...

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IEEE Global Telecommunications Conference (GLOBECOM)

作者： Chehade, Tarek Collin, Ludovic Rostaing, Philippe Radoi, Emanuel Bazzi, Oussama Univ Europeenne Bretagne Rennes France Univ Brest Brest France CNRS UMR 6285 LabSTICC Brest France Lebanese Univ Hadath Fac Sci 1 Dept Phys & Elect Beirut Lebanon

ISBN: (纸本)9781479959525

In this paper, we focus on a multiple-input multiple-output (MIMO) linear precoder based on the minimum Euclidean distance criterion, the max-d(min) precoder. We propose an optimization of this precoder for the case of an association with a non-binary low density parity check code (NB-LDPC). After recalling the well-known max-d(min) precoder, we set forth an optimization of the mutual information of initial message, i.e. I-(0), through the extrinsic information transfer (EXIT) analysis of the system. We present a new adaptive precoder whose forms are determined in function of an adaptive threshold angle, optimized in terms of the mutual information I-(0), and depending on the signal-to-noise ratio at the reception (SNRR). The performance of the new precoder is brought out through a theoretical study along with a series of numerical simulations.

关键词： MIMO system linear precoding max-d(min) precoder NB-LDPC codes EXIT charts mutual information

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Block diagonalization with interference control for energy efficient downlink

Block diagonalization with interference control for energy e...

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21st Annual IEEE International Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC)

作者： Riahi, Anis Kamoun, Mohamed CEA LIST Lab Syst Communicants F-91191 Gif Sur Yvette France

ISBN: (纸本)9781424480166

Block diagonalization is a linear precoding technique which eliminates the multi-user interference at the transmitter side by creating parallel orthogonal single user links. In this technique, the transmit diversity order is fixed for each user and only power can be controlled to satisfy SINR requirements. This restricts the degrees of freedom available for resource allocation and limits the energy efficiency of the power allocation schemes performed by the base-station. In this contribution we present a new extension to block diagonalization where spatial degrees of freedom can also be adjusted in addition to power and bandwidth. With this new technique, it is possible to serve multiple users with different rate requirements by tolerating a controllable amount of interference. The amount of interference is controlled through an algebraic parameter that can be tuned in order to allow energy efficient power allocation.

关键词： linear precoding block diagonalization MU-MIMO energy efficient power allocation

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Massive Multi-Antenna Communications with Low-Resolution Data Converters

Massive Multi-Antenna Communications with Low-Resolution Dat...

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作者： Sven Jacobsson Chalmers University of Technology

学位级别：博士

Massive multi-user (MU) multiple-input multiple-output (MIMO) will be a core tech- nology in future cellular communication systems. In massive MU-MIMO systems, the number of antennas at the base station (BS) is scaled up by several orders of magnitude compared to traditional multi-antenna systems with the goals of enabling large gains in capacity and energy efficiency. However, scaling up the number of active antenna elements at the BS will lead to significant increases in power consumption and system costs unless power-efficient and low-cost hardware components are used. In this thesis, we investigate the performance of massive MU-MIMO systems for the case when the BS is equipped with low-resolution data converters. First, we consider the massive MU-MIMO uplink for the case when the BS uses low- resolution analog-to-digital converters (ADCs) to convert the received signal into the dig- ital domain. Our focus is on the case where neither the transmitter nor the receiver have any a priori channel state information (CSI), which implies that the channel realizations have to be learned through pilot transmission followed by BS-side channel estimation, based on coarsely quantized observations. We derive a low-complexity channel estimator and present lower bounds and closed-form approximations for the information-theoretic rates achievable with the proposed channel estimator together with conventional linear detection algorithms. Second, we consider the massive MU-MIMO downlink for the case when the BS uses low-resolution digital-to-analog converters (DACs) to generate the transmit signal. We derive lower bounds and closed-form approximations for the achievable rates with linear precoding under the assumption that the BS has access to perfect CSI. We also propose novel nonlinear precoding algorithms that are shown to significantly outperform linear precoding for the extreme case of 1-bit DACs. Specifically, for the case of symbol-rate 1-bit DACs and frequency-ﬂat channels

关键词： Massive multi-user multiple-input multiple-output analog-to-digital converter digital-to-analog converter quantization hardware impairments beamforming channel estimation linear combing linear precoding nonlinear precoding convex optimization orthogonal frequency-division multiplexing

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