Performance Analysis on Non-SIC ML Receiver for NOMA Strong Channel User (Part II): 4PAM under Rayleigh Fading Channel 


Vol. 45,  No. 1, pp. 26-33, Jan.  2020
10.7840/kics.2020.45.1.26


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  Abstract

In non-orthogonal multiple access (NOMA), successive interference cancellation (SIC) is the essential foundation for NOMA techniques. This paper derives the optimal performance for NOMA with 4-ary pulse amplitude modulation (4PAM) under Rayleigh fading channels. Such performances are calculated by first deriving the maximum-likelihood (ML) performance, conditioned on the channel gain, and then averaging the conditioned performance over the channel gain. As opposed to the standard SIC, which is by nature the hard-decision based SIC, we present the optimal ML performance, which can be viewed as the soft-decision based SIC, namely, the optimal soft SIC, because it is general that the soft-decision performance is better than the hard-decision performance. It is shown that the severe performance degradation of the optimal soft SIC can be mitigated, if we avoid the power allocation factors about 10%, 20%, 30%, 50%, 70%, 80%, 90%, under Rayleigh fading channel environments. In future researches, it is meaningful to achieve the perfect SIC performance for NOMA, because the NOMA capacity guarantees the perfect SIC performance for one of two users, regardless of the power allocation, i.e., for the entire range of the power allocation factor, from 0% to 100%.

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  Cite this article

[IEEE Style]

K. Chung, "Performance Analysis on Non-SIC ML Receiver for NOMA Strong Channel User (Part II): 4PAM under Rayleigh Fading Channel," The Journal of Korean Institute of Communications and Information Sciences, vol. 45, no. 1, pp. 26-33, 2020. DOI: 10.7840/kics.2020.45.1.26.

[ACM Style]

Kyuhyuk Chung. 2020. Performance Analysis on Non-SIC ML Receiver for NOMA Strong Channel User (Part II): 4PAM under Rayleigh Fading Channel. The Journal of Korean Institute of Communications and Information Sciences, 45, 1, (2020), 26-33. DOI: 10.7840/kics.2020.45.1.26.

[KICS Style]

Kyuhyuk Chung, "Performance Analysis on Non-SIC ML Receiver for NOMA Strong Channel User (Part II): 4PAM under Rayleigh Fading Channel," The Journal of Korean Institute of Communications and Information Sciences, vol. 45, no. 1, pp. 26-33, 1. 2020. (https://doi.org/10.7840/kics.2020.45.1.26)

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pISSN : 1226 - 4717
eISSN : 2287 - 3880