Iterative Multiuser Equalization for Subconnected Hybrid mmWave Massive MIMO Architecture
Millimeter waves and massive MIMO are a promising combination to achieve the multi-Gb/s required by future 5G wireless systems. However, fully digital architectures are not feasible due to hardware limitations, which means that there is a need to design signal processing techniques for hybrid analog...
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creator | Dinis, R. Silva, Adão Castanheira, Daniel Mendes, V. Magueta, Roberto Gameiro, Atílio |
description | Millimeter waves and massive MIMO are a promising combination to achieve the multi-Gb/s required by future 5G wireless systems. However, fully digital architectures are not feasible due to hardware limitations, which means that there is a need to design signal processing techniques for hybrid analog-digital architectures. In this manuscript, we propose a hybrid iterative block multiuser equalizer for subconnected millimeter wave massive MIMO systems. The low complexity user-terminals employ pure-analog random precoders, each with a single RF chain. For the base station, a subconnected hybrid analog-digital equalizer is designed to remove multiuser interference. The hybrid equalizer is optimized using the average bit-error-rate as a metric. Due to the coupling between the RF chains in the optimization problem, the computation of the optimal solutions is too complex. To address this problem, we compute the analog part of the equalizer sequentially over the RF chains using a dictionary built from the array response vectors. The proposed subconnected hybrid iterative multiuser equalizer is compared with a recently proposed fully connected approach. The results show that the performance of the proposed scheme is close to the fully connected hybrid approach counterpart after just a few iterations. |
doi_str_mv | 10.1155/2017/9171068 |
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However, fully digital architectures are not feasible due to hardware limitations, which means that there is a need to design signal processing techniques for hybrid analog-digital architectures. In this manuscript, we propose a hybrid iterative block multiuser equalizer for subconnected millimeter wave massive MIMO systems. The low complexity user-terminals employ pure-analog random precoders, each with a single RF chain. For the base station, a subconnected hybrid analog-digital equalizer is designed to remove multiuser interference. The hybrid equalizer is optimized using the average bit-error-rate as a metric. Due to the coupling between the RF chains in the optimization problem, the computation of the optimal solutions is too complex. To address this problem, we compute the analog part of the equalizer sequentially over the RF chains using a dictionary built from the array response vectors. The proposed subconnected hybrid iterative multiuser equalizer is compared with a recently proposed fully connected approach. The results show that the performance of the proposed scheme is close to the fully connected hybrid approach counterpart after just a few iterations.</description><identifier>ISSN: 1530-8669</identifier><identifier>EISSN: 1530-8677</identifier><identifier>DOI: 10.1155/2017/9171068</identifier><language>eng</language><publisher>Cairo, Egypt: Hindawi Publishing Corporation</publisher><subject>Algorithms ; Antennas ; Chains ; Complexity ; Design ; Equalization ; Iterative methods ; Millimeter waves ; MIMO (control systems) ; Multiuser systems ; Optimization ; Receivers & amplifiers ; Signal processing ; Vectors (mathematics) ; Wireless networks</subject><ispartof>Wireless communications and mobile computing, 2017-01, Vol.2017 (2017), p.1-13</ispartof><rights>Copyright © 2017 R. Magueta et al.</rights><rights>Copyright © 2017 R. Magueta et al. 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Notwithstanding the ProQuest Terms and Conditions, you may use this content in accordance with the terms of the License.</rights><lds50>peer_reviewed</lds50><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c385t-ad1c27b7b2296c1253c7b4122989c192034b765b6b3fa25a40f7d4837b5ba86b3</citedby><cites>FETCH-LOGICAL-c385t-ad1c27b7b2296c1253c7b4122989c192034b765b6b3fa25a40f7d4837b5ba86b3</cites><orcidid>0000-0002-7008-6773 ; 0000-0002-8520-7267 ; 0000-0001-6958-4129 ; 0000-0002-3858-2574</orcidid></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><link.rule.ids>314,780,784,27924,27925</link.rule.ids></links><search><contributor>Seeling, Patrick</contributor><contributor>Patrick Seeling</contributor><creatorcontrib>Dinis, R.</creatorcontrib><creatorcontrib>Silva, Adão</creatorcontrib><creatorcontrib>Castanheira, Daniel</creatorcontrib><creatorcontrib>Mendes, V.</creatorcontrib><creatorcontrib>Magueta, Roberto</creatorcontrib><creatorcontrib>Gameiro, Atílio</creatorcontrib><title>Iterative Multiuser Equalization for Subconnected Hybrid mmWave Massive MIMO Architecture</title><title>Wireless communications and mobile computing</title><description>Millimeter waves and massive MIMO are a promising combination to achieve the multi-Gb/s required by future 5G wireless systems. However, fully digital architectures are not feasible due to hardware limitations, which means that there is a need to design signal processing techniques for hybrid analog-digital architectures. In this manuscript, we propose a hybrid iterative block multiuser equalizer for subconnected millimeter wave massive MIMO systems. The low complexity user-terminals employ pure-analog random precoders, each with a single RF chain. For the base station, a subconnected hybrid analog-digital equalizer is designed to remove multiuser interference. The hybrid equalizer is optimized using the average bit-error-rate as a metric. Due to the coupling between the RF chains in the optimization problem, the computation of the optimal solutions is too complex. To address this problem, we compute the analog part of the equalizer sequentially over the RF chains using a dictionary built from the array response vectors. The proposed subconnected hybrid iterative multiuser equalizer is compared with a recently proposed fully connected approach. 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subjects | Algorithms Antennas Chains Complexity Design Equalization Iterative methods Millimeter waves MIMO (control systems) Multiuser systems Optimization Receivers & amplifiers Signal processing Vectors (mathematics) Wireless networks |
title | Iterative Multiuser Equalization for Subconnected Hybrid mmWave Massive MIMO Architecture |
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