Exploiting Low Complexity Beam Allocation in Multi-User Switched Beam Millimeter Wave Systems

Switched-beam systems offer a promising solution for realizing multi-user communications at millimeter wave (mmWave) frequencies. A low-complexity beam allocation (LBA) algorithm has been proposed to solve the challenging problem of maximizing sum data-rates. However, there are practical limitations...

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Bibliographic Details
Published in:IEEE access 2019, Vol.7, p.2894-2903
Main Authors: Nair, Manish, Wang, Junyuan, Leiba, Yigal, Zhu, Huiling, Gomes, Nathan J., Wang, Jiangzhou
Format: Article
Language:English
Subjects:
Algorithms
Array signal processing
beam-allocation
Beamforming
Complexity
Complexity theory
fixed-beam
Interference
Lens antennas
millimeter wave
Millimeter waves
mobile communications
Radio equipment
Radio frequency
Resource management
Sidelobes
Signal to noise ratio
Switches
Systems design
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Summary:Switched-beam systems offer a promising solution for realizing multi-user communications at millimeter wave (mmWave) frequencies. A low-complexity beam allocation (LBA) algorithm has been proposed to solve the challenging problem of maximizing sum data-rates. However, there are practical limitations in mmWave systems, such as restrictions in the number of available radio frequency transceiver chains at the base station, sensitivity to sidelobe interference and the beam generation techniques. In this paper, using generalized beam-patterns, we present the maximum sum data-rates achievable in switched-beam mmWave systems compared with fixed-beam systems by applying LBA. Then, the impact on maximum sum data rates of actual beam-patterns, obtained from a practical mmWave lens antenna, which have higher and non-uniform sidelobes compared with the theoretical beams, is assessed. Finally, as a guide for practical wireless system design, benchmarks are established for relative sidelobe levels that provide acceptable sum data-rate performance when considering generalized beam patterns.
ISSN:2169-3536
2169-3536
DOI:10.1109/ACCESS.2018.2887003