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http://dx.doi.org/10.7236/IJIBC.2021.13.3.34

On Lossless Interval of Low-Correlated Superposition Coding NOMA toward 6G URLLC  

Chung, Kyuhyuk (Department of Software Science, Dankook University)
Publication Information
International Journal of Internet, Broadcasting and Communication / v.13, no.3, 2021 , pp. 34-41 More about this Journal
Abstract
Recently, a lossless non-successive interference cancellation (SIC) non-orthogonal multiple access (NOMA) implementation has been proposed. Such lossless NOMA without SIC is achieved via correlated superposition coding (SC), in comparison with conventional independent SC. However, only high-correlated SC was investigated in the lossless non-SIC NOMA implementation. Thus, this paper investigates low-correlated SC, especially a lossless interval, owing to low-correlation between signals. First, for the low-correlated SC scheme, we derive the closed-form expressions for the two roots with which the lossless interval is defined. Then, simulations demonstrate that the lossless interval of low-correlated SC NOMA is enlarged, with a degraded middle interval, compared to that of high-correlated SC NOMA. Moreover, we also show that such tendency becomes stronger as the value of the correlation coefficient varies. As a result, the proposed low-correlated SC scheme could be considered as a promising correlated SC scheme, with the enlarged lossless interval in NOMA toward the future sixth-generation (6G) ultra-reliable low-latency communications (URLLC).
Keywords
NOMA; 6G; URLLC; Superposition coding; Successive interference cancellation; Power allocation;
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