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Multi-user MIMO

About: Multi-user MIMO is a research topic. Over the lifetime, 10265 publications have been published within this topic receiving 227206 citations. The topic is also known as: multi user mimo & MU-MIMO.


Papers
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Journal ArticleDOI
TL;DR: A proposal is made for the use of a 2 times 2 MIMO system in outdoor-indoor scenarios for BFWA applications in metropolitan environments based on the experimentally verified hypothesis that the path loss due to building penetration can be practically compensated for by the diversity gain of 2 times 1 systems.
Abstract: The unquestionable advantages of multiple-input multiple-output (MIMO) systems are having a strong influence on the development of new wireless systems, both in wireless local-area networks (WLANs), and in those designed to offer broadband fixed wireless access (BFWA) services in wireless metropolitan-area networks (WMANs). The MIMO channel characterization in different environments and for different operating frequency bands is a crucial factor in the design of new systems and standards, and for adequate planning of existing systems. This article makes two main contributions. First, the experimental characterization of a 2 times 2 MIMO channel at a frequency of 2.4 GHz in a canonical outdoor-indoor scenario is presented. The channel characterization performed includes the analysis of the spatial correlation between the MIMO system subchannels and its impact on the channel capacity. Second, on the basis of the capacity results obtained, a proposal is made for the use of a 2 times 2 MIMO system in outdoor-indoor scenarios for BFWA applications in metropolitan environments. The proposal is based on the experimentally verified hypothesis that the path loss due to building penetration can be practically compensated for by the diversity gain of 2 times 2 systems

35 citations

Proceedings ArticleDOI
Guowang Miao1, Jianzhong Zhang1
01 Dec 2011
TL;DR: It is shown that user antennas should be used only when the corresponding subchannels are sufficiently good and using them improves the overall network EE, and low-complexity yet globally optimal energy-efficient power allocation algorithms that converge to the optimum exponentially are developed.
Abstract: Energy efficiency is becoming increasingly important for mobile devices because battery technology has not kept up with the growing demand of ubiquitous multimedia communications. Since multi-user multiple-input multiple-output (MU-MIMO) is a key technology in next-generation wireless communications, this paper addresses optimal energy-efficient design for MU-MIMO. The energy efficiency is measured by a classic metric, ``throughput per Joule'', while both RF transmit power and device electronic circuit power are considered. We define the energy efficiency (EE) capacity for MU-MIMO and study the power allocation that achieves this capacity. We show that user antennas should be used only when the corresponding subchannels are sufficiently good and using them improves the overall network EE. Based on theoretical analysis, we further develop low-complexity yet globally optimal energy-efficient power allocation algorithms that converge to the optimum exponentially. Finally comprehensive simulation results are provided to demonstrate the significant gain in network energy efficiency.

35 citations

Journal ArticleDOI
TL;DR: This paper presents a MIMO array system that is composed of electromagnetic vector antennas (EMVA), which provides closed-form automatically paired azimuth-elevation angle estimation, resolves up to six targets with distinct locations, requires no restrictions on transmit antennas placement, and offers a performance better than the MIMo array system with spatially separated scalar-antennas of comparable receive data size.

35 citations

Patent
03 Aug 2010
TL;DR: In this paper, the uplink power control signals are provided to a user equipment (UE) via a base station signaled power allocation scheme responsive to a determination of whether or not the UL transmission is in a interference limited condition relative to a neighboring cell.
Abstract: In a wireless communication network that performs Multiple Input Multiple Output (MIMO) communication, uplink power control signals are provided to a user equipment (UE) via a base station signaled power allocation scheme responsive to a determination of whether or not the uplink transmission is in a interference limited condition relative to a neighboring cell.

35 citations

Journal ArticleDOI
TL;DR: Simulation results show the superiority of the proposed schemes on EE, both the optimal algorithm and the low complexity sub-optimal algorithm.
Abstract: This letter studies the energy efficiency (EE) optimization problem for the simultaneous wireless information and power transfer (SWIPT) MIMO systems with statistical channel state information (CSI) feedback. Considering the further transmission of the energy harvesting node, the potential capacity produced by the transferred energy is counted in system capacity. Both the optimal algorithm and the low complexity sub-optimal algorithm are proposed. Simulation results show the superiority of the proposed schemes on EE.

35 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202363
2022122
2021170
2020211
2019234
2018263