Grant-free random access for 6G mMTC in distributed-AP MIMO system

Massive Machine Type Communication (mMTC) is a major target use case for the sixth generation (6G) communications, which introduces challenges in multiple access schemes. In this dissertation, we introduce a grant-free random access (GFRA) system based on compressed sensing (CS), aiming to simultane...

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Main Author: Chen, Shuqiao
Other Authors: Guan Yong Liang
Format: Thesis-Master by Coursework
Language:English
Published: Nanyang Technological University 2024
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Online Access:https://hdl.handle.net/10356/181483
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spelling sg-ntu-dr.10356-1814832024-12-06T15:49:17Z Grant-free random access for 6G mMTC in distributed-AP MIMO system Chen, Shuqiao Guan Yong Liang School of Electrical and Electronic Engineering EYLGuan@ntu.edu.sg Engineering Grant-free random access User activity detection Channel estimation Distributed-AP MIMO Orthogonal frequency division multiplexing Massive Machine Type Communication (mMTC) is a major target use case for the sixth generation (6G) communications, which introduces challenges in multiple access schemes. In this dissertation, we introduce a grant-free random access (GFRA) system based on compressed sensing (CS), aiming to simultaneously satisfy massive connectivity in mMTC systems. It addresses the critical challenge of joint user activity detection (UAD) and channel estimation (CE) in GFRA systems with message-passing approach. Specifically, we first propose GFRA schemes in narrowband distributed access point (AP) multiple-input multiple-output (MIMO) systems with frequency flat fading channels, and develop a joint-UAD-CE receiver based on approximate message passing (AMP) and orthogonal approximate message passing (OAMP). Furthermore, we set the decision rule for UAD based on certain threshold. In addition, we extend the joint-UAD-CE study to wideband scenario with multipath frequency-selective fading channels, where a new system model utilizing orthogonal frequency division multiplexing (OFDM) scheme is introduced. We also adjust the AMP and OAMP algorithms in the corresponding wideband scenarios. Numerical results show that proposed methods attain high estimation and detection accuracy, which demonstrate that the proposed GFRA can accommodate the requirement of massive access. Master's degree 2024-12-04T07:22:55Z 2024-12-04T07:22:55Z 2024 Thesis-Master by Coursework Chen, S. (2024). Grant-free random access for 6G mMTC in distributed-AP MIMO system. Master's thesis, Nanyang Technological University, Singapore. https://hdl.handle.net/10356/181483 https://hdl.handle.net/10356/181483 en ISM-DISS-03226 application/pdf Nanyang Technological University
institution Nanyang Technological University
building NTU Library
continent Asia
country Singapore
Singapore
content_provider NTU Library
collection DR-NTU
language English
topic Engineering
Grant-free random access
User activity detection
Channel estimation
Distributed-AP MIMO
Orthogonal frequency division multiplexing
spellingShingle Engineering
Grant-free random access
User activity detection
Channel estimation
Distributed-AP MIMO
Orthogonal frequency division multiplexing
Chen, Shuqiao
Grant-free random access for 6G mMTC in distributed-AP MIMO system
description Massive Machine Type Communication (mMTC) is a major target use case for the sixth generation (6G) communications, which introduces challenges in multiple access schemes. In this dissertation, we introduce a grant-free random access (GFRA) system based on compressed sensing (CS), aiming to simultaneously satisfy massive connectivity in mMTC systems. It addresses the critical challenge of joint user activity detection (UAD) and channel estimation (CE) in GFRA systems with message-passing approach. Specifically, we first propose GFRA schemes in narrowband distributed access point (AP) multiple-input multiple-output (MIMO) systems with frequency flat fading channels, and develop a joint-UAD-CE receiver based on approximate message passing (AMP) and orthogonal approximate message passing (OAMP). Furthermore, we set the decision rule for UAD based on certain threshold. In addition, we extend the joint-UAD-CE study to wideband scenario with multipath frequency-selective fading channels, where a new system model utilizing orthogonal frequency division multiplexing (OFDM) scheme is introduced. We also adjust the AMP and OAMP algorithms in the corresponding wideband scenarios. Numerical results show that proposed methods attain high estimation and detection accuracy, which demonstrate that the proposed GFRA can accommodate the requirement of massive access.
author2 Guan Yong Liang
author_facet Guan Yong Liang
Chen, Shuqiao
format Thesis-Master by Coursework
author Chen, Shuqiao
author_sort Chen, Shuqiao
title Grant-free random access for 6G mMTC in distributed-AP MIMO system
title_short Grant-free random access for 6G mMTC in distributed-AP MIMO system
title_full Grant-free random access for 6G mMTC in distributed-AP MIMO system
title_fullStr Grant-free random access for 6G mMTC in distributed-AP MIMO system
title_full_unstemmed Grant-free random access for 6G mMTC in distributed-AP MIMO system
title_sort grant-free random access for 6g mmtc in distributed-ap mimo system
publisher Nanyang Technological University
publishDate 2024
url https://hdl.handle.net/10356/181483
_version_ 1819113064565309440