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A Low Sampling Rate Receiver Design for Multi-Antenna Multi-User OFDM Systems

The future 6G mobile communication network will support an unprecedented amount of Internet of Things (IoT) devices, which will boost the demand for low cost terminals under the principle of green communication. One of the critical issues for low cost terminals is the sampling rate of analog-to-digi...

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Detalles Bibliográficos
Autores principales: Ou, Zeliang, Liu, Xiaofeng, Yang, Hongwen
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2022
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9029444/
https://www.ncbi.nlm.nih.gov/pubmed/35455111
http://dx.doi.org/10.3390/e24040448
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author Ou, Zeliang
Liu, Xiaofeng
Yang, Hongwen
author_facet Ou, Zeliang
Liu, Xiaofeng
Yang, Hongwen
author_sort Ou, Zeliang
collection PubMed
description The future 6G mobile communication network will support an unprecedented amount of Internet of Things (IoT) devices, which will boost the demand for low cost terminals under the principle of green communication. One of the critical issues for low cost terminals is the sampling rate of analog-to-digital converters (ADCs) at the receivers. A high sampling rate of the ADC gives rise to a high energy consumption and high hardware cost for the terminal. In the conventional multi-user OFDM systems, all users have to sample the received signal with a sampling rate that is larger than or equal to the Nyquist rate, despite only a small fraction of the bandwidth (number of subcarriers) is allocated to each user. This paper proposes a low sampling rate receiver design for multi-antenna multi-user OFDM systems. With the aid of zero-forcing precoding, the sampling rate of the receiver can be reduced to [Formula: see text] of the Nyquist rate, where K is the number of users. The simulation results show that with a significant reduction in sampling rate, performance loss is insignificant and acceptable in terms of bit error rate, mutual information and peak-to-average power ratio.
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spelling pubmed-90294442022-04-23 A Low Sampling Rate Receiver Design for Multi-Antenna Multi-User OFDM Systems Ou, Zeliang Liu, Xiaofeng Yang, Hongwen Entropy (Basel) Article The future 6G mobile communication network will support an unprecedented amount of Internet of Things (IoT) devices, which will boost the demand for low cost terminals under the principle of green communication. One of the critical issues for low cost terminals is the sampling rate of analog-to-digital converters (ADCs) at the receivers. A high sampling rate of the ADC gives rise to a high energy consumption and high hardware cost for the terminal. In the conventional multi-user OFDM systems, all users have to sample the received signal with a sampling rate that is larger than or equal to the Nyquist rate, despite only a small fraction of the bandwidth (number of subcarriers) is allocated to each user. This paper proposes a low sampling rate receiver design for multi-antenna multi-user OFDM systems. With the aid of zero-forcing precoding, the sampling rate of the receiver can be reduced to [Formula: see text] of the Nyquist rate, where K is the number of users. The simulation results show that with a significant reduction in sampling rate, performance loss is insignificant and acceptable in terms of bit error rate, mutual information and peak-to-average power ratio. MDPI 2022-03-24 /pmc/articles/PMC9029444/ /pubmed/35455111 http://dx.doi.org/10.3390/e24040448 Text en © 2022 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Ou, Zeliang
Liu, Xiaofeng
Yang, Hongwen
A Low Sampling Rate Receiver Design for Multi-Antenna Multi-User OFDM Systems
title A Low Sampling Rate Receiver Design for Multi-Antenna Multi-User OFDM Systems
title_full A Low Sampling Rate Receiver Design for Multi-Antenna Multi-User OFDM Systems
title_fullStr A Low Sampling Rate Receiver Design for Multi-Antenna Multi-User OFDM Systems
title_full_unstemmed A Low Sampling Rate Receiver Design for Multi-Antenna Multi-User OFDM Systems
title_short A Low Sampling Rate Receiver Design for Multi-Antenna Multi-User OFDM Systems
title_sort low sampling rate receiver design for multi-antenna multi-user ofdm systems
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9029444/
https://www.ncbi.nlm.nih.gov/pubmed/35455111
http://dx.doi.org/10.3390/e24040448
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