MEMS-based VCSEL beam steering using replicated polymer diffractive lens

2008 ◽  
Vol 142 (1) ◽  
pp. 336-345 ◽  
Author(s):  
Karin Hedsten ◽  
Jonas Melin ◽  
Jörgen Bengtsson ◽  
Peter Modh ◽  
David Karlén ◽  
...  
Keyword(s):  
Beam Steering ◽  
Diffractive Lens

Symmetric-pair antennas for beam steering, direction finding or isotropic-reception gain

1991 ◽  
Vol 138 (4) ◽  
pp. 368 ◽  
Author(s):  
R. Benjamin ◽  
W. Titze ◽  
P.V. Brennan ◽  
H.D. Griffiths
Keyword(s):  
Beam Steering ◽  
Direction Finding ◽  
Symmetric Pair

Electromagnetically Driven 2-axis Optical Beam Steering MEMS Mirror and Its Dependence of Actuation on Magnetic Field

2010 ◽  
Vol 130 (4) ◽  
pp. 107-112 ◽  
Author(s):  
Yoshiyuki Watanabe ◽  
Yutaka Abe ◽  
Shinnosuke Iwamatsu ◽  
Seiya Kobayashi ◽  
Yoshiyuki Takahashi ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Beam Steering ◽  
Optical Beam

An Optimized Scheme for Optical Phased Array Beam Steering Controlled by Wavelength

PIERS Online ◽  
2007 ◽  
Vol 3 (2) ◽  
pp. 127-131 ◽  
Author(s):  
Ying Zhao ◽  
Xiaozhou Yang ◽  
Qin Cai ◽  
Weiwei Hu
Keyword(s):  
Phased Array ◽  
Beam Steering ◽  
Optical Phased Array

scholarly journals Low-complexity beam-domain channel estimation and power allocation in hybrid architecture massive MIMO systems

2019 ◽  
Vol 2019 (1) ◽  
Author(s):  
Xiao Chen ◽  
Zaichen Zhang ◽  
Liang Wu ◽  
Jian Dang
Keyword(s):  
Channel Estimation ◽  
Power Allocation ◽  
Spectral Efficiency ◽  
Communication Systems ◽  
Mimo Systems ◽  
Beam Steering ◽  
Estimation Method ◽  
Low Complexity ◽  
Estimation Accuracy ◽  
Hybrid Architecture

Abstract In this journal, we investigate the beam-domain channel estimation and power allocation in hybrid architecture massive multiple-input and multiple-output (MIMO) communication systems. First, we propose a low-complexity channel estimation method, which utilizes the beam steering vectors achieved from the direction-of-arrival (DOA) estimation and beam gains estimated by low-overhead pilots. Based on the estimated beam information, a purely analog precoding strategy is also designed. Then, the optimal power allocation among multiple beams is derived to maximize spectral efficiency. Finally, simulation results show that the proposed schemes can achieve high channel estimation accuracy and spectral efficiency.

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