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Transceiver Optimization for mmWave Line-of-Sight MIMO Systems Using Hybrid Arrays

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Bibliographic Details
Title: Transceiver Optimization for mmWave Line-of-Sight MIMO Systems Using Hybrid Arrays
Authors: Junwen Deng, Hang Li, Jian Andrew Zhang, Xiaojing Huang, Zhiqun Cheng
Source: Micromachines, Vol 14, Iss 2, p 236 (2023)
Publisher Information: MDPI AG
Publication Year: 2023
Collection: Directory of Open Access Journals: DOAJ Articles
Subject Terms: line-of-sight, multiple input multiple output, transceiver optimization, hybrid arrays, quantization, Mechanical engineering and machinery, TJ1-1570
Description: The performance of millimeter wave (mmWave) line-of-sight multiple input multiple output (LOS MIMO) systems using hybrid arrays of planar subarrays was studied. We characterized the achievable maximum spatial multiplexing gain for such LOS MIMO systems by the measures of spectral efficiency and effective degree of freedom (EDoF). By proposing a joint plane-wave and spherical-wave-based general 3D channel model, we derived the optimal design parameters in the analog domain, i.e., the optimal subarray separation products, and analyzed their sensitivity on the system performance. We also gave analytical eigenvalue expressions of the equivalent LOS MIMO channel matrix, which are applicable to the case of a non-optimal design, as well as the upper and lower bounds of the EDoF for system performance evaluation. A piecewise uniform quantization codebook was further designed for quantizing phase shifter values in practical applications. The numerical and simulation results show that planar subarrays are superior to traditional arrays in terms of spectral efficiency and EDoF in Ricean fading channels because they are more robust to the change in the communication distance and the deviation from the optimal design. The use of hybrid arrays of planar subarrays effectively removes the limitation of mmWave LOS MIMO systems using traditional arrays, through which, the conventional Rayleigh distance criterion has to be satisfied to achieve the optimal performance.
Document Type: article in journal/newspaper
Language: English
Relation: https://www.mdpi.com/2072-666X/14/2/236; https://doaj.org/toc/2072-666X; https://doaj.org/article/d9467b6cce9246eb82ec2955aaddfb92
DOI: 10.3390/mi14020236
Availability: https://doi.org/10.3390/mi14020236
https://doaj.org/article/d9467b6cce9246eb82ec2955aaddfb92
Accession Number: edsbas.CA85B54
Database: BASE
Description
Abstract:The performance of millimeter wave (mmWave) line-of-sight multiple input multiple output (LOS MIMO) systems using hybrid arrays of planar subarrays was studied. We characterized the achievable maximum spatial multiplexing gain for such LOS MIMO systems by the measures of spectral efficiency and effective degree of freedom (EDoF). By proposing a joint plane-wave and spherical-wave-based general 3D channel model, we derived the optimal design parameters in the analog domain, i.e., the optimal subarray separation products, and analyzed their sensitivity on the system performance. We also gave analytical eigenvalue expressions of the equivalent LOS MIMO channel matrix, which are applicable to the case of a non-optimal design, as well as the upper and lower bounds of the EDoF for system performance evaluation. A piecewise uniform quantization codebook was further designed for quantizing phase shifter values in practical applications. The numerical and simulation results show that planar subarrays are superior to traditional arrays in terms of spectral efficiency and EDoF in Ricean fading channels because they are more robust to the change in the communication distance and the deviation from the optimal design. The use of hybrid arrays of planar subarrays effectively removes the limitation of mmWave LOS MIMO systems using traditional arrays, through which, the conventional Rayleigh distance criterion has to be satisfied to achieve the optimal performance.
DOI:10.3390/mi14020236