Hierarchical optimization: A hybrid processing for downlink massive MU‐MIMO mmWave systems

Abstract Communications using the millimeter wave (mmWave) spectrum are a mainstream technology of the next generation systems due to their huge available bandwidth. However, the mmWave band will experience much more propagation loss than a low‐frequency band. Conventional precoding techniques are i...

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Autor principal:	Alvaro Javier Ortega
Formato:	article
Lenguaje:	EN
Publicado:	Wiley 2021
Materias:	Telecommunication TK5101-6720
Acceso en línea:	https://doaj.org/article/ec65856247af4e5493fd3fb796af9163
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spelling	oai:doaj.org-article:ec65856247af4e5493fd3fb796af91632021-12-01T07:07:54ZHierarchical optimization: A hybrid processing for downlink massive MU‐MIMO mmWave systems1751-86361751-862810.1049/cmu2.12292https://doaj.org/article/ec65856247af4e5493fd3fb796af91632021-12-01T00:00:00Zhttps://doi.org/10.1049/cmu2.12292https://doaj.org/toc/1751-8628https://doaj.org/toc/1751-8636Abstract Communications using the millimeter wave (mmWave) spectrum are a mainstream technology of the next generation systems due to their huge available bandwidth. However, the mmWave band will experience much more propagation loss than a low‐frequency band. Conventional precoding techniques are impractical in mmWave scenarios due to manufacturing costs and power consumption. Hybrid alternatives have been considered as a promising technology to provide a compromise between hardware complexity and system performance by reducing the number of radio‐frequency (RF) chains. In this paper, a hybrid processing design for downlink in mmWave scenarios is proposed, where the number of RF chains is reduced to the number of data streams. The precodification process is made by a three‐stage‐based hybrid precoder, whereas in the terminals, the equalization process only requires a low complex analog combiner. The three stages of the hybrid precoder are designed by a hierarchical strategy. The first stage addresses the phase shifters aiming to maximize the sum‐rate system, whereas the second and third stages are dedicated to mitigating the inter‐user interference effects. The proposed methodology gets a robust signal processing that can greatly mitigate the side effects of hardware reduction. Numerical results in terms of bit error rate (BER) and sum‐rate evidence that the proposed method not only overcomes other hybrid precoders/combiners but also reaches the same performance as a fully digital technique in some scenarios.Alvaro Javier OrtegaWileyarticleTelecommunicationTK5101-6720ENIET Communications, Vol 15, Iss 20, Pp 2526-2536 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Telecommunication TK5101-6720
spellingShingle	Telecommunication TK5101-6720 Alvaro Javier Ortega Hierarchical optimization: A hybrid processing for downlink massive MU‐MIMO mmWave systems
description	Abstract Communications using the millimeter wave (mmWave) spectrum are a mainstream technology of the next generation systems due to their huge available bandwidth. However, the mmWave band will experience much more propagation loss than a low‐frequency band. Conventional precoding techniques are impractical in mmWave scenarios due to manufacturing costs and power consumption. Hybrid alternatives have been considered as a promising technology to provide a compromise between hardware complexity and system performance by reducing the number of radio‐frequency (RF) chains. In this paper, a hybrid processing design for downlink in mmWave scenarios is proposed, where the number of RF chains is reduced to the number of data streams. The precodification process is made by a three‐stage‐based hybrid precoder, whereas in the terminals, the equalization process only requires a low complex analog combiner. The three stages of the hybrid precoder are designed by a hierarchical strategy. The first stage addresses the phase shifters aiming to maximize the sum‐rate system, whereas the second and third stages are dedicated to mitigating the inter‐user interference effects. The proposed methodology gets a robust signal processing that can greatly mitigate the side effects of hardware reduction. Numerical results in terms of bit error rate (BER) and sum‐rate evidence that the proposed method not only overcomes other hybrid precoders/combiners but also reaches the same performance as a fully digital technique in some scenarios.
format	article
author	Alvaro Javier Ortega
author_facet	Alvaro Javier Ortega
author_sort	Alvaro Javier Ortega
title	Hierarchical optimization: A hybrid processing for downlink massive MU‐MIMO mmWave systems
title_short	Hierarchical optimization: A hybrid processing for downlink massive MU‐MIMO mmWave systems
title_full	Hierarchical optimization: A hybrid processing for downlink massive MU‐MIMO mmWave systems
title_fullStr	Hierarchical optimization: A hybrid processing for downlink massive MU‐MIMO mmWave systems
title_full_unstemmed	Hierarchical optimization: A hybrid processing for downlink massive MU‐MIMO mmWave systems
title_sort	hierarchical optimization: a hybrid processing for downlink massive mu‐mimo mmwave systems
publisher	Wiley
publishDate	2021
url	https://doaj.org/article/ec65856247af4e5493fd3fb796af9163
work_keys_str_mv	AT alvarojavierortega hierarchicaloptimizationahybridprocessingfordownlinkmassivemumimommwavesystems
_version_	1718405450186096640

Hierarchical optimization: A hybrid processing for downlink massive MU‐MIMO mmWave systems

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