Improved Performance of NOMA: Multilevel Symmetric Superposition Coding under Rayleigh Fading Channel 


Vol. 45,  No. 1, pp. 20-25, Jan.  2020
10.7840/kics.2020.45.1.20


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  Abstract

The main principle of non-orthogonal multiple access (NOMA) recommends that low power is allocated to the strong channel user, in order to guarantee the user fairness. Recently, symmetric superposition coding (SSC) has been proposed to mitigate the effect of error propagation (EP) in NOMA with quadrature phase shift keying (QPSK) for visible light communication (VLC) networks. It has been verified analytically that SSC NOMA with binary phase shift keying (BPSK) achieves the performance of the perfect SIC for the power allocation factor range less than 50%. However, SSC for multilevel modulations has not been reported in the literature in NOMA. As continuing researches, we propose NOMA with the multilevel SSC for the 4-ary pulse amplitude modulation (4PAM). It is shown that the performance of 4PAM SSC NOMA achieves the perfect SIC performance for the power allocation factor range less than about 10 %, while the performance of 4PAM NOMA with the normal superposition coding (NSC) is the same as that of the perfect SIC NOMA for the power allocation factor range less than about 5 %. As a result, the promising feature of SSC, i.e., the improved performance on the low power allocation range, is still preserved for multilevel modulations.

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  Cite this article

[IEEE Style]

K. Chung, "Improved Performance of NOMA: Multilevel Symmetric Superposition Coding under Rayleigh Fading Channel," The Journal of Korean Institute of Communications and Information Sciences, vol. 45, no. 1, pp. 20-25, 2020. DOI: 10.7840/kics.2020.45.1.20.

[ACM Style]

Kyuhyuk Chung. 2020. Improved Performance of NOMA: Multilevel Symmetric Superposition Coding under Rayleigh Fading Channel. The Journal of Korean Institute of Communications and Information Sciences, 45, 1, (2020), 20-25. DOI: 10.7840/kics.2020.45.1.20.

[KICS Style]

Kyuhyuk Chung, "Improved Performance of NOMA: Multilevel Symmetric Superposition Coding under Rayleigh Fading Channel," The Journal of Korean Institute of Communications and Information Sciences, vol. 45, no. 1, pp. 20-25, 1. 2020. (https://doi.org/10.7840/kics.2020.45.1.20)

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pISSN : 1226 - 4717
eISSN : 2287 - 3880