University of Oulu

Murti, FW, Siregar, RF, Royyan, M, Shin, SY. Exploiting non‐orthogonal multiple access in downlink coordinated multipoint transmission with the presence of imperfect channel state information. Int J Commun Syst. 2020; 33:e4533. https://doi.org/10.1002/dac.4533

Exploiting non-orthogonal multiple access in downlink coordinated multipoint transmission with the presence of imperfect channel state information

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Author: Murti, Fahri Wisnu1,2; Siregar, Rahmat Faddli1,2; Royyan, Muhammad3,2;
Organizations: 1Faculty of Information Technology and Electrical Engineering (ITEE), University of Oulu, Finland
2Dept. of IT Convergence Engineering, Kumoh National Institute of Technology, South Korea
3Department of Signal Processing and Acoustics, Aalto University, Finland
Format: article
Version: accepted version
Access: embargoed
Persistent link: http://urn.fi/urn:nbn:fi-fe2020102787861
Language: English
Published: John Wiley & Sons, 2020
Publish Date: 2021-07-14
Description:

Abstract

In this paper, the impact of imperfect channel state information (CSI) on a downlink coordinated multipoint (CoMP) transmission system with non‐orthogonal multiple access (NOMA) is investigated since perfect knowledge of a channel cannot be guaranteed in practice. Furthermore, the channel estimation error is applied to estimate the channel information wherein its a priori of variance is assumed to be known. The impact of the number of coordinated base stations (BSs) on downlink CoMP NOMA is investigated. Users are classified into one of two groups according to their position within the cell, namely, cell‐center user (CCU) and cell‐edge user (CEU). In this paper, ergodic capacity and sum capacity for both CCU and CEU are derived as closed forms. In addition, various experiments are conducted with different parameters such as SNR, error variance, and power allocation to show their impact on the CoMP method. The results show that CoMP NOMA outperforms the CoMP orthogonal multiple access (OMA) wherein the condition of the channel impacts the performance of CoMP NOMA less. It is worth noting that a higher number of coordinated BSs enhances the total capacity of CoMP NOMA. Finally, the performance analysis is validated due to the close accordance between the analytical and simulation results.

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Series: International journal of communication systems
ISSN: 1074-5351
ISSN-E: 1099-1131
ISSN-L: 1074-5351
Volume: 33
Issue: 14
Article number: e4533
DOI: 10.1002/dac.4533
OADOI: https://oadoi.org/10.1002/dac.4533
Type of Publication: A1 Journal article – refereed
Field of Science: 213 Electronic, automation and communications engineering, electronics
Subjects:
Funding: This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MSIT) (No. 2019R1A2C1089542).
Copyright information: © 2020 John Wiley & Sons, Ltd. This is the peer reviewed version of the following article: Murti, FW, Siregar, RF, Royyan, M, Shin, SY. Exploiting non‐orthogonal multiple access in downlink coordinated multipoint transmission with the presence of imperfect channel state information. Int J Commun Syst. 2020; 33:e4533. https://doi.org/10.1002/dac.4533, which has been published in final form at https://doi.org/10.1002/dac.4533. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Self-Archiving.