Outdoor Experimental Trials of Millimeter-Wave Base Station Cooperation with Digital Beamforming in High-Mobility Environments for 5G Evolution

2020 ◽  
Author(s):  
Tatsuki Okuyama ◽  
Satoshi Suyama ◽  
Nobuhide Nonaka ◽  
Yukihiko Okumura ◽  
Takahiro Asai
Keyword(s):  
Millimeter Wave ◽  
High Mobility ◽  
Base Station ◽  
Digital Beamforming ◽  
Base Station Cooperation ◽  
Experimental Trials

Millimeter-Wave Base Station Cooperation Technologies for High-Mobility Environments

2021 ◽  
Author(s):  
Tatsuki Okuyama ◽  
Satoshi Suyama ◽  
Nobuhide Nonaka ◽  
Takahiro Asai
Keyword(s):  
Millimeter Wave ◽  
High Mobility ◽  
Base Station ◽  
Base Station Cooperation

scholarly journals Hybrid Beamforming for Millimeter-Wave Heterogeneous Networks

Electronics ◽  
2019 ◽  
Vol 8 (2) ◽  
pp. 133 ◽  
Author(s):  
Mostafa Hefnawi
Keyword(s):  
Millimeter Wave ◽  
Heterogeneous Networks ◽  
Antenna Arrays ◽  
Large Scale ◽  
Network Capacity ◽  
Base Station ◽  
Antenna Element ◽  
Digital Beamforming ◽  
Hybrid Beamforming ◽  
Cell Base

Heterogeneous networks (HetNets) employing massive multiple-input multiple-output (MIMO) and millimeter-wave (mmWave) technologies have emerged as a promising solution to enhance the network capacity and coverage of next-generation 5G cellular networks. However, the use of traditional fully-digital MIMO beamforming methods, which require one radio frequency (RF) chain per antenna element, is not practical for large-scale antenna arrays, due to the high cost and high power consumption. To reduce the number of RF chains, hybrid analog and digital beamforming has been proposed as an alternative structure. In this paper, therefore, we consider a HetNet formed with one macro-cell base station (MBS) and multiple small-cell base stations (SBSs) equipped with large-scale antenna arrays that employ hybrid analog and digital beamforming. The analog beamforming weight vectors of the MBS and the SBSs correspond to the the best-fixed multi-beams obtained by eigendecomposition schemes. On the other hand, digital beamforming weights are optimized to maximize the receive signal-to-interference-plus-noise ratio (SINR) of the effective channels consisting of the cascade of the analog beamforming weights and the actual channel. The performance is evaluated in terms of the beampatterns and the ergodic channel capacity and shows that the proposed hybrid beamforming scheme achieves near-optimal performance with only four RF chains while requiring considerably less computational complexity.

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