Achievable Spectral Efficiency of Hybrid Beamforming Massive MIMO Systems With Quantized Phase Shifters, Channel Non-Reciprocity and Estimation Errors

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.

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

IEEE Transactions on Vehicular Technology ◽

10.1109/tvt.2018.2807921 ◽

2018 ◽

Vol 67 (6) ◽

pp. 4843-4851 ◽

Cited By ~ 30

Author(s):

Sohail Payami ◽

Mir Ghoraishi ◽

Mehrdad Dianati ◽

Mathini Sellathurai

Keyword(s):

Massive Mimo ◽

Mimo Systems ◽

Phase Shifters ◽

Hybrid Beamforming

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Hybrid Beamforming with Fixed Phase Shifters for Uplink Cell-Free Millimetre-Wave Massive MIMO Systems

2021 Joint European Conference on Networks and Communications & 6G Summit (EuCNC/6G Summit) ◽

10.1109/eucnc/6gsummit51104.2021.9482579 ◽

2021 ◽

Author(s):

Abdulrahman Al Avidh ◽

Yusuf Sambo ◽

Shuja Ansari ◽

Muhammad Ali Imran

Keyword(s):

Massive Mimo ◽

Mimo Systems ◽

Phase Shifters ◽

Millimetre Wave ◽

Fixed Phase ◽

Hybrid Beamforming

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Hybrid Beamforming With Discrete Phase Shifters for Millimeter-Wave Massive MIMO Systems

IEEE Transactions on Vehicular Technology ◽

10.1109/tvt.2017.2670638 ◽

2017 ◽

Vol 66 (8) ◽

pp. 7604-7608 ◽

Cited By ~ 34

Author(s):

Jung-Chieh Chen

Keyword(s):

Millimeter Wave ◽

Massive Mimo ◽

Mimo Systems ◽

Phase Shifters ◽

Discrete Phase ◽

Hybrid Beamforming

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Beam Pattern Optimization Method for Subarray-Based Hybrid Beamforming Systems

Wireless Communications and Mobile Computing ◽

10.1155/2020/8853794 ◽

2020 ◽

Vol 2020 ◽

pp. 1-7

Author(s):

Joerg Eisenbeis ◽

Jonas Pfaff ◽

Christian Karg ◽

Jerzy Kowalewski ◽

Yueheng Li ◽

...

Keyword(s):

Communication Networks ◽

Massive Mimo ◽

Mimo Systems ◽

Multiple Input Multiple Output ◽

Phase Shifters ◽

Beam Pattern ◽

Scattering Parameter ◽

Receiver System ◽

Calibration Methods ◽

Hybrid Beamforming

Massive multiple-input multiple-output (MIMO) systems operating at millimeter-wave (mmWave) frequencies promise to satisfy the demand for higher data rates in mobile communication networks. A practical challenge that arises is the calibration in amplitude and phase of these massive MIMO systems, as the antenna elements are too densely packed to provide a separate calibration branch for measuring them independently. Over-the-air (OTA) calibration methods are viable solutions to this problem. In contrast to previous works, the here presented OTA calibration method is investigated and optimized for subarray-based hybrid beamforming (SBHB) systems. SBHB systems represent an efficient architectural solution to realize massive MIMO systems. Moreover, based on OTA scattering parameter measurements, the ambiguities of the phase shifters are exploited and two criteria to optimize the beam pattern are formulated. Finally, the optimization criteria are examined in measurements utilizing a novel SBHB receiver system operating at 27.8 GHz.

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