Hybrid beamforming with finite-resolution phase shifters for large-scale MIMO systems

2015 ◽  
Author(s):  
Foad Sohrabi ◽  
Wei Yu
Keyword(s):  
Large Scale ◽  
Mimo Systems ◽  
Phase Shifters ◽  
Finite Resolution ◽  
Hybrid Beamforming

scholarly journals Design and Development of Novel Hybrid Precoder for Millimeter-Wave MIMO System

2021 ◽  
Vol 13 (3) ◽  
Author(s):  
SRINIVAS K ◽  
T Srinivasulu
Keyword(s):  
Millimeter Wave ◽  
Spectral Efficiency ◽  
Large Scale ◽  
Processing Time ◽  
Mimo Systems ◽  
Mimo System ◽  
Phase Shifters ◽  
Additional Element ◽  
Factorization Problem ◽  
Hybrid Beamforming

Power consumption and hardware cost reduction with the use of hybrid beamforming in large-scale millimeter wave MIMO systems. The large dimensional analog precoding integrates with the hybrid beamforming based on the phase shifters including digital precoding with lower dimensionality. The reduction of Euclidean distance between the hybrid precoder and fully digital is the major problem to overcome the minimization of resultant spectral efficiency. The issue formulates as a fully digital precoder’s matrix factorization problem based on the analog RF precoder matrix and the digital baseband precoder matrix. An additional element-wise unit modulus constraint is imposed by the phase shifters on the analog RF precoder matrix. The traditional methods have a problem of performance loss in spectral efficiency. In the processing time and iteration, high complexities result in optimization algorithms. In this paper, a novel low complexity algorithm proposes which maximizes the spectral efficiency and reduces the computational processing time. 

scholarly journals Hybrid Beamforming With a Reduced Number of Phase Shifters for Massive MIMO Systems

2018 ◽  
Vol 67 (6) ◽  
pp. 4843-4851 ◽  
Author(s):  
Sohail Payami ◽  
Mir Ghoraishi ◽  
Mehrdad Dianati ◽  
Mathini Sellathurai
Keyword(s):  
Massive Mimo ◽  
Mimo Systems ◽  
Phase Shifters ◽  
Hybrid Beamforming

scholarly journals Beam Pattern Optimization Method for Subarray-based Hybrid Beamforming Systems

2020 ◽  
Author(s):  
Joerg Eisenbeis ◽  
Jonas Pfaff ◽  
Christian Karg ◽  
Jerzy Kowalewski ◽  
Yueheng Li ◽  
...  
Keyword(s):  
Mimo Systems ◽  
Beam Steering ◽  
Multiple Input Multiple Output ◽  
Optimization Method ◽  
Phase Shifters ◽  
Beam Pattern ◽  
Scattering Parameter ◽  
Receiver System ◽  
Input Multiple Output ◽  
Hybrid Beamforming

Subarray-based hybrid beamforming (SBHB) systems represent an efficient architectural solution to realize massive multiple-input multiple-output (MIMO) systems. Thereby, the beamforming is no longer realized exclusively in the digital domain, but in coordination with an analog beamforming network by connecting each digital channel to a dedicated number of antenna elements via phase shifters. Most channel estimation and beamforming algorithms for SBHB systems are based on beam steering approaches, demanding a precise calibration of the analog beamforming network. In this letter, the SBHB system is calibrated by over-the-air (OTA) scattering parameter measurements and two criteria to optimize the beam pattern are formulated exploiting the ambiguities of the phase shifters. Both optimization criteria are evaluated using a designed SBHB receiver system operating at 27.8 GHz.

Practical Hybrid Beamforming With Finite-Resolution Phase Shifters for Reconfigurable Intelligent Surface Based Multi-User Communications

2020 ◽  
Vol 69 (4) ◽  
pp. 4565-4570 ◽  
Author(s):  
Boya Di ◽  
Hongliang Zhang ◽  
Lianlin Li ◽  
Lingyang Song ◽  
Yonghui Li ◽  
...  
Keyword(s):  
Phase Shifters ◽  
Finite Resolution ◽  
Hybrid Beamforming
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