Orthogonally Precoded Massive MIMO for High Mobility Scenarios

Massive multiple-input multiple-output (MIMO) systems are of high interest for ultra-reliable low-latency communication (URLLC) links. They provide channel hardening, i.e. reduced channel variations, due to the large number of transmit antennas which exploit spatial diversity by beam-forming. Massiv...

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Main Authors: Thomas Zemen, David Loschenbrand, Markus Hofer, Christoph Pacher, Benjamin Rainer
Format: Article
Language:English
Published: IEEE 2019-01-01
Series:IEEE Access
Subjects:
5G
Online Access:https://ieeexplore.ieee.org/document/8836598/
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spelling doaj-157974cdbe6b4417b42ce879d01614412021-04-05T17:12:53ZengIEEEIEEE Access2169-35362019-01-01713297913299010.1109/ACCESS.2019.29413168836598Orthogonally Precoded Massive MIMO for High Mobility ScenariosThomas Zemen0https://orcid.org/0000-0002-9392-9155David Loschenbrand1Markus Hofer2https://orcid.org/0000-0002-1915-9869Christoph Pacher3Benjamin Rainer4AIT Austrian Insitute of Technology GmbH, Vienna, AustriaAIT Austrian Insitute of Technology GmbH, Vienna, AustriaAIT Austrian Insitute of Technology GmbH, Vienna, AustriaAIT Austrian Insitute of Technology GmbH, Vienna, AustriaAIT Austrian Insitute of Technology GmbH, Vienna, AustriaMassive multiple-input multiple-output (MIMO) systems are of high interest for ultra-reliable low-latency communication (URLLC) links. They provide channel hardening, i.e. reduced channel variations, due to the large number of transmit antennas which exploit spatial diversity by beam-forming. Massive MIMO requires channel state information (CSI) on the base station side. For time-varying vehicular communication channels the CSI acquired during the uplink phase will be outdated for the following downlink phase, leading to reduced spatial channel hardening. We investigate a combination of massive MIMO with general orthogonal precoding (OP) to compensate this effect. OP uses two-dimensional precoding sequences in the time-frequency domain and provides channel hardening by exploiting time- and frequency diversity. We show that the combination of massive MIMO and OP is beneficial for time-varying communication channels. While the spatial channel hardening of massive MIMO decreases, the time-frequency channel hardening of OP increases with larger time-variance of the communication channel. An iterative receiver algorithm for massive MIMO with OP as well as a detailed analysis of the channel hardening effect is presented. We demonstrate a BER reduction by more than one order of magnitude for a velocity of 50 km/h = 16.6 m/s using the orthogonal frequency division multiplexing (OFDM) based 5G new radio (NR) physical layer.https://ieeexplore.ieee.org/document/8836598/5Gmassive MIMOorthogonal precodingultra-reliable low-latency communication (URLLC) links
collection DOAJ
language English
format Article
sources DOAJ
author Thomas Zemen
David Loschenbrand
Markus Hofer
Christoph Pacher
Benjamin Rainer
spellingShingle Thomas Zemen
David Loschenbrand
Markus Hofer
Christoph Pacher
Benjamin Rainer
Orthogonally Precoded Massive MIMO for High Mobility Scenarios
IEEE Access
5G
massive MIMO
orthogonal precoding
ultra-reliable low-latency communication (URLLC) links
author_facet Thomas Zemen
David Loschenbrand
Markus Hofer
Christoph Pacher
Benjamin Rainer
author_sort Thomas Zemen
title Orthogonally Precoded Massive MIMO for High Mobility Scenarios
title_short Orthogonally Precoded Massive MIMO for High Mobility Scenarios
title_full Orthogonally Precoded Massive MIMO for High Mobility Scenarios
title_fullStr Orthogonally Precoded Massive MIMO for High Mobility Scenarios
title_full_unstemmed Orthogonally Precoded Massive MIMO for High Mobility Scenarios
title_sort orthogonally precoded massive mimo for high mobility scenarios
publisher IEEE
series IEEE Access
issn 2169-3536
publishDate 2019-01-01
description Massive multiple-input multiple-output (MIMO) systems are of high interest for ultra-reliable low-latency communication (URLLC) links. They provide channel hardening, i.e. reduced channel variations, due to the large number of transmit antennas which exploit spatial diversity by beam-forming. Massive MIMO requires channel state information (CSI) on the base station side. For time-varying vehicular communication channels the CSI acquired during the uplink phase will be outdated for the following downlink phase, leading to reduced spatial channel hardening. We investigate a combination of massive MIMO with general orthogonal precoding (OP) to compensate this effect. OP uses two-dimensional precoding sequences in the time-frequency domain and provides channel hardening by exploiting time- and frequency diversity. We show that the combination of massive MIMO and OP is beneficial for time-varying communication channels. While the spatial channel hardening of massive MIMO decreases, the time-frequency channel hardening of OP increases with larger time-variance of the communication channel. An iterative receiver algorithm for massive MIMO with OP as well as a detailed analysis of the channel hardening effect is presented. We demonstrate a BER reduction by more than one order of magnitude for a velocity of 50 km/h = 16.6 m/s using the orthogonal frequency division multiplexing (OFDM) based 5G new radio (NR) physical layer.
topic 5G
massive MIMO
orthogonal precoding
ultra-reliable low-latency communication (URLLC) links
url https://ieeexplore.ieee.org/document/8836598/
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