Digital Precoders for Partially Spectral Overlapping Subarrays in mmWave Satellite Communications

With the emergence of sixth-generation (6G) wireless services, low Earth orbit (LEO) satellite communications are increasingly recognized as a promising solution for providing extensive wireless coverage to terrestrial users. Subarray-based hybrid beamforming offers an efficient implementation metho...

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Bibliographic Details
Published in:IEEE access Vol. 12; pp. 187265 - 187277
Main Authors: Hsiao, Feng-Chin, Ku, Meng-Lin, Song, Yan-Zhou
Format: Journal Article
Language:English
Published: Piscataway IEEE 2024
The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subjects:
Array signal processing
Beamforming
Bit error rate
Digital computers
digital precoder
Downlink
Error analysis
hybrid beamforming
Interference
Low earth orbit satellites
Low earth orbits
millimeter wave (mmWave)
Millimeter wave communication
Millimeter waves
minimum mean square error (MMSE)
Satellite broadcasting
Satellite communication
Satellite communications
Satellites
Signal to noise ratio
Vectors
Wireless communications
ISSN:2169-3536, 2169-3536
Online Access:Get full text
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Summary:With the emergence of sixth-generation (6G) wireless services, low Earth orbit (LEO) satellite communications are increasingly recognized as a promising solution for providing extensive wireless coverage to terrestrial users. Subarray-based hybrid beamforming offers an efficient implementation method in millimeter wave (mmWave) communications; however, current approaches that use either non-overlapping or fully overlapping spectrum for subarrays may result in inefficient spectrum usage or severe inter-beam interference. In this paper, we investigate digital precoders for two partially spectral overlapping subarrays of LEO satellites using hybrid beamforming to enhance spectrum utilization while mitigating inter-beam interference. We propose and analyze an interference model for partially spectral overlapping subarrays, which theoretically characterizes the inter-beam interference effect resulting from partial spectrum overlapping in hybrid beamforming. Utilizing an approximated interference model to simplify the analysis, we derive a closed-form expression for a minimum mean square error (MMSE)-based digital precoder, constrained by total transmit power. Extensive computer simulations demonstrate the effectiveness of the proposed MMSE digital precoder in improving the bit error rate (BER), signal-to-interference-plus-noise ratio (SINR), sum rate, and spectrum utilization.
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ISSN:2169-3536
2169-3536
DOI:10.1109/ACCESS.2024.3512953