Results 21 to 30 of about 839,900 (174)
Spectral Efficiency Improvement and Power Control Optimization of Massive MIMO Networks
IEEE Access, 2021 Higher requirements must be put forward about wireless signal transmission in harsh environments. Energy loss mitigation, channel estimation, noise interference reduction demands high quality of service in wireless communication.
Xiu Zhang, Hao Qi, Xin Zhang, Liang Han
doaj +1 more source
Cell-Free Massive MIMO Versus Small Cells [PDF]
IEEE Transactions on Wireless Communications, 2016 A Cell-Free Massive MIMO (multiple-input multiple-output) system comprises a very large number of distributed access points (APs), which simultaneously serve a much smaller number of users over the same time/frequency resources based on directly measured
H. Ngo +4 more
semanticscholar +1 more source
IET Networks, EarlyView., 2023 We utilise a metaheuristic optimisation method, inspired by nature, called the Lévy‐flight firefly algorithm (LFA), to tackle the power regulation and user grouping in the NOMA systems. Abstract The non‐orthogonal multiple access strategies have shown promise to boost fifth generation and sixth generation wireless networks' spectral efficiency and ...
Zaid Albataineh +4 more
wiley +1 more source
Energy Efficiency of User-Centric, Cell-Free Massive MIMO-OFDM with Instantaneous CSI
Entropy, 2022 In the user-centric, cell-free, massive multi-input, multi-output (MIMO) orthogonal frequency division multiplexing (OFDM) system, a large number of deployed access points (APs) serve user equipment (UEs) simultaneously, using the same time–frequency ...
Tongzhou Han, Danfeng Zhao
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Scalable Cell-Free Massive MIMO Systems [PDF]
IEEE Transactions on Communications, 2019 Imagine a coverage area with many wireless access points that cooperate to jointly serve the users, instead of creating autonomous cells. Such a cell-free network operation can potentially resolve many of the interference issues that appear in current ...
Emil Björnson, L. Sanguinetti
semanticscholar +1 more source
Overview of Precoding Techniques for Massive MIMO
IEEE Access, 2021 Massive multiple-input multiple-output (MIMO) is playing a crucial role in the fifth generation (5G) and beyond 5G (B5G) communication systems. Unfortunately, the complexity of massive MIMO systems is tremendously increased when a large number of ...
Mahmoud A. Albreem +3 more
doaj +1 more source
Making Cell-Free Massive MIMO Competitive With MMSE Processing and Centralized Implementation [PDF]
IEEE Transactions on Wireless Communications, 2019 Cell-free Massive MIMO is considered as a promising technology for satisfying the increasing number of users and high rate expectations in beyond-5G networks.
Emil Björnson, L. Sanguinetti
semanticscholar +1 more source
Reconfigurable Intelligent Surface-Assisted Cell-Free Massive MIMO Systems Over Spatially-Correlated Channels [PDF]
IEEE Transactions on Wireless Communications, 2021 Cell-Free Massive multiple-input multiple-output (MIMO) and reconfigurable intelligent surface (RIS) are two promising technologies for application to beyond-5G networks.
Trinh Van Chien +4 more
semanticscholar +1 more source
Deep Learning for Massive MIMO CSI Feedback [PDF]
IEEE Wireless Communications Letters, 2017 In frequency division duplex mode, the downlink channel state information (CSI) should be sent to the base station through feedback links so that the potential gains of a massive multiple-input multiple-output can be exhibited.
Chao-Kai Wen, Wan-Ting Shih, Shi Jin
semanticscholar +1 more source
Channel Estimation for Extremely Large-Scale Massive MIMO: Far-Field, Near-Field, or Hybrid-Field? [PDF]
IEEE Communications Letters, 2021 Extremely large-scale massive MIMO (XL-MIMO) is a promising technique for future 6G communications. However, existing far-field or near-field channel model mismatches the hybrid-field channel feature in the practical XL-MIMO system.
Xiuhong Wei, L. Dai
semanticscholar +1 more source