Hybrid beamforming for downlink multiuser millimetre wave MIMO-OFDM systems

In this study, the authors consider multi-user millimetre wave (mmWave) multiple-input multiple-output (MIMO) downlink communications for multi-carrier scenarios, e.g. orthogonal frequency-division multiplexing (OFDM) a common analogue precoder and combiner for the transmitter and receiver to maximi...

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Vydáno v:	IET communications Ročník 13; číslo 11; s. 1557 - 1564
Hlavní autoři:	Zhang, Didi, Wang, Yafeng, Li, Xuehua, Xiang, Wei
Médium:	Journal Article
Jazyk:	angličtina
Vydáno:	The Institution of Engineering and Technology 16.07.2019
Témata:	array signal processing block diagonal method channel average channel estimation channel information combiner common analogue precoder computational complexity digital precoder downlink multiuser fully digital precoding method hybrid beamforming main challenge MIMO communication multicarrier MIMO systems multiple‐input multiple‐output downlink communications multiuser millimetre wave OFDM modulation orthogonal frequency‐division multiplexing precoding receiver Research Article spectral efficiency subcarrier third‐order tensor transmitter wave MIMO‐OFDM systems block diagonal method downlink multiuser main challenge channel information hybrid beamforming digital precoder precoding channel average multiuser millimetre wave spectral efficiency orthogonal frequency-division multiplexing OFDM modulation MIMO communication transmitter array signal processing receiver multicarrier MIMO systems common analogue precoder fully digital precoding method multiple-input multiple-output downlink communications combiner third-order tensor wave MIMO-OFDM systems channel estimation subcarrier computational complexity
ISSN:	1751-8628, 1751-8636
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Shrnutí:	In this study, the authors consider multi-user millimetre wave (mmWave) multiple-input multiple-output (MIMO) downlink communications for multi-carrier scenarios, e.g. orthogonal frequency-division multiplexing (OFDM) a common analogue precoder and combiner for the transmitter and receiver to maximise spectral efficiency is the main challenge for multi-carrier MIMO systems, they propose two methods to solve this problem. The first method designs the analogue precoder and combiner based on the channel average of all subcarriers, which helps reduce computational complexity. Moreover, the channels of all subcarriers can be viewed as a third-order tensor, and the second method is based on tensor unfolding, which makes full use of the channel information of all subcarriers. When the common analogue precoder and combiner are fixed, they consider designing a digital precoder to maximise the signal-to-leakage-plus-noise ratio of each user in every subcarrier, which leads to closed-form solutions compared with the block diagonal method. Simulation results demonstrate that the performance of the proposed methods is close to that of the fully digital precoding method, and increasing the number of RF transceiver chains helps improve the performance of the proposed methods.
ISSN:	1751-8628 1751-8636
DOI:	10.1049/iet-com.2018.6061