Sum-Rate Maximization of NOMA Systems under Imperfect Successive Interference Cancellation

Islam AbuMahady; Ebrahim Bedeer Mohamed; Salama Ikki; Halim Yanikomeroglu

doi:10.1109/LCOMM.2019.2893195

Sum-Rate Maximization of NOMA Systems under Imperfect Successive Interference Cancellation

Islam AbuMahady, Ebrahim Bedeer Mohamed, Salama Ikki, Halim Yanikomeroglu

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Abstract

This letter addresses the sum-rate maximization for a downlink non-orthogonal multiple access (NOMA) system in the presence of imperfect successive interference cancellation (SIC). We assume that the NOMA users adopt improper Gaussian signaling (IGS), and hence derive new expressions of their rates under residual interference from imperfect SIC. We optimize the circularity coefficient of the IGS-based NOMA system to maximize its sum-rate subject to quality-of-service requirements. Compared to the NOMA with proper Gaussian signaling, simulation results show that the IGS-based NOMA system demonstrates considerable sum-rate performance gain under imperfect SIC.

Original language	English
Article number	8621012
Pages (from-to)	474-477
Number of pages	4
Journal	IEEE Communications Letters
Volume	23
Issue number	3
Early online date	22 Jan 2019
DOIs	https://doi.org/10.1109/LCOMM.2019.2893195
Publication status	Published (in print/issue) - 1 Mar 2019

Keywords

Improper Gaussian Signalling
Non-linear optimization
NOMA
sum-rate
imperfect successive interference cancellation
non-linear optimization
Improper Gaussian signaling

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title = "Sum-Rate Maximization of NOMA Systems under Imperfect Successive Interference Cancellation",

abstract = "This letter addresses the sum-rate maximization for a downlink non-orthogonal multiple access (NOMA) system in the presence of imperfect successive interference cancellation (SIC). We assume that the NOMA users adopt improper Gaussian signaling (IGS), and hence derive new expressions of their rates under residual interference from imperfect SIC. We optimize the circularity coefficient of the IGS-based NOMA system to maximize its sum-rate subject to quality-of-service requirements. Compared to the NOMA with proper Gaussian signaling, simulation results show that the IGS-based NOMA system demonstrates considerable sum-rate performance gain under imperfect SIC.",

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N2 - This letter addresses the sum-rate maximization for a downlink non-orthogonal multiple access (NOMA) system in the presence of imperfect successive interference cancellation (SIC). We assume that the NOMA users adopt improper Gaussian signaling (IGS), and hence derive new expressions of their rates under residual interference from imperfect SIC. We optimize the circularity coefficient of the IGS-based NOMA system to maximize its sum-rate subject to quality-of-service requirements. Compared to the NOMA with proper Gaussian signaling, simulation results show that the IGS-based NOMA system demonstrates considerable sum-rate performance gain under imperfect SIC.

AB - This letter addresses the sum-rate maximization for a downlink non-orthogonal multiple access (NOMA) system in the presence of imperfect successive interference cancellation (SIC). We assume that the NOMA users adopt improper Gaussian signaling (IGS), and hence derive new expressions of their rates under residual interference from imperfect SIC. We optimize the circularity coefficient of the IGS-based NOMA system to maximize its sum-rate subject to quality-of-service requirements. Compared to the NOMA with proper Gaussian signaling, simulation results show that the IGS-based NOMA system demonstrates considerable sum-rate performance gain under imperfect SIC.

KW - Improper Gaussian Signalling

KW - Non-linear optimization

KW - NOMA

KW - sum-rate

KW - imperfect successive interference cancellation

KW - non-linear optimization

KW - Improper Gaussian signaling

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JO - IEEE Communications Letters

JF - IEEE Communications Letters

IS - 3

M1 - 8621012

ER -

Sum-Rate Maximization of NOMA Systems under Imperfect Successive Interference Cancellation

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Keywords

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