Two-Step Codebook-Assisted Alternating Minimization (CA-AltMin) for Low-Complexity Hybrid Beamforming Design
Journal
IEEE Communications Letters
Journal Volume
25
Journal Issue
6
Pages
1989-1993
Date Issued
2021
Author(s)
Abstract
Hybrid beamforming can effectively reduce the cost of millimeter wave multiple-input-multiple-output (MIMO) system. However, the analog beamformer realized by the unit-norm phase shifters makes the design of the hybrid beamformers a complicated non-convex optimization problem, and prior works suffer from high computational complexity. In this letter, we focus on the single-user scenario and propose a two-step procedure for the low-complexity hybrid beamforming design. The first step employs a codebook-based algorithm to provide an initial setting of the hybrid beamformers. The second step employs the AltMin-based algorithm to refine the hybrid beamformers. In particular, we also modify the loss function used in the AltMin algorithm for complexity reduction. Simulation results show that the proposed codebook-assisted AltMin (CA-AltMin) reduces the complexity by 96% and achieves better performance than the state-of-the-art algorithms from different technical aspects. © 1997-2012 IEEE.
Subjects
alternating minimization; codebook; hybrid beamforming; mmWave MIMO system
Other Subjects
Beamforming; Convex optimization; Millimeter waves; MIMO systems; Alternating minimization; Analog beamformer; Complexity reduction; Hybrid beamforming; Nonconvex optimization; State-of-the-art algorithms; Technical aspects; Two-step procedure; Computational complexity
Type
journal article