Uplink non-orthogonal multiple access with channel estimation errors for internet of things applications

Minjoong Rim; Chung G. Kang

doi:10.3390/s19040912

Uplink non-orthogonal multiple access with channel estimation errors for internet of things applications

Minjoong Rim, Chung G. Kang

Research output: Contribution to journal › Article › peer-review

7 Citations (Scopus)

Abstract

One of the key requirements for next generation wireless or cellular communication systems is to efficiently support a large number of connections for Internet of Things (IoT) applications, and uplink non-orthogonal multiple access (NOMA) schemes can be used for this purpose. In uplink NOMA systems, pilot symbols, as well as data symbols can be superimposed onto shared resources. The error rate performance can be severely degraded due to channel estimation errors, especially when the number of superimposed packets is large. In this paper, we discuss uplink NOMA schemes with channel estimation errors, assuming that quadrature phase shift keying (QPSK) modulation is used. When pilot signals are superimposed onto the shared resources and a large number of devices perform random accesses concurrently to a single resource of the base station, the channels might not be accurately estimated even in high SNR environments. In this paper, we propose an uplink NOMA scheme, which can alleviate the performance degradation due to channel estimation errors.

Original language	English
Article number	912
Journal	Sensors (Switzerland)
Volume	19
Issue number	4
DOIs	https://doi.org/10.3390/s19040912
Publication status	Published - 2019 Feb 2

Bibliographical note

Funding Information:
Funding: This work was supported in part by the National Research Foundation of Korea(NRF) grant funded by the Korea government (MSIT) (No. 2016R1A2B1008953), in part by Institute for Information & communications Technology Promotion (IITP) grant funded by the Korea government (MSIT) (No. 2014-0-00282, Development of 5G Mobile Communication Technologies for Hyper-connected smart services), and in part by ’The Cross-Ministry Giga KOREA Project’ grant funded by the Korea government (MSIT) (No. GK18S0400, Research and Development of Open 5G Reference Model).

Publisher Copyright:
© 2019 by the authors. Licensee MDPI, Basel, Switzerland.

Keywords

Channel estimation
IoT
Massive IoT
NOMA
QPSK
Random access

ASJC Scopus subject areas

Analytical Chemistry
Biochemistry
Atomic and Molecular Physics, and Optics
Instrumentation
Electrical and Electronic Engineering

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10.3390/s19040912

Cite this

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abstract = "One of the key requirements for next generation wireless or cellular communication systems is to efficiently support a large number of connections for Internet of Things (IoT) applications, and uplink non-orthogonal multiple access (NOMA) schemes can be used for this purpose. In uplink NOMA systems, pilot symbols, as well as data symbols can be superimposed onto shared resources. The error rate performance can be severely degraded due to channel estimation errors, especially when the number of superimposed packets is large. In this paper, we discuss uplink NOMA schemes with channel estimation errors, assuming that quadrature phase shift keying (QPSK) modulation is used. When pilot signals are superimposed onto the shared resources and a large number of devices perform random accesses concurrently to a single resource of the base station, the channels might not be accurately estimated even in high SNR environments. In this paper, we propose an uplink NOMA scheme, which can alleviate the performance degradation due to channel estimation errors.",

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note = "Funding Information: Funding: This work was supported in part by the National Research Foundation of Korea(NRF) grant funded by the Korea government (MSIT) (No. 2016R1A2B1008953), in part by Institute for Information & communications Technology Promotion (IITP) grant funded by the Korea government (MSIT) (No. 2014-0-00282, Development of 5G Mobile Communication Technologies for Hyper-connected smart services), and in part by {\textquoteright}The Cross-Ministry Giga KOREA Project{\textquoteright} grant funded by the Korea government (MSIT) (No. GK18S0400, Research and Development of Open 5G Reference Model). Publisher Copyright: {\textcopyright} 2019 by the authors. Licensee MDPI, Basel, Switzerland.",

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Uplink non-orthogonal multiple access with channel estimation errors for internet of things applications

Abstract

Bibliographical note

Keywords

ASJC Scopus subject areas

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