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http://dx.doi.org/10.6109/jkiice.2021.25.2.267

Non-Orthogonal Multiple Access based Phase Rotation Index Modulation  

Lee, Hye Yeong (Department of IT Convergence Engineering, Kumoh National Institute of Technology)
Shin, Soo Young (Department of Electronic Engineering, Kumoh National Institute of Technology)
Publication Information
Journal of the Korea Institute of Information and Communication Engineering / v.25, no.2, 2021 , pp. 267-273 More about this Journal
Abstract
Non-orthogonal multiple access is the promised candidates in the next generation wireless networks to improve the spectral efficiency by superposing multiple signals. In general, the superposition coding is performed using the difference in channel gain between users based on the user's power allocation. However, when user pairs have the similar channel gain problem, NOMA can not be allowed in the scenario. To overcome this problem, phase rotation based NOMA is presented to increase minimum distance between superposed signals in the constellation point. This paper proposed a novel non-orthogonal multiple access based index modulation using phase rotation. The additional bits can transfer using the index bits that is allocated according to the activated state of the phase rotation. Simulation results are shown that bit error rate and achievable sum rate are better than conventional NOMA.
Keywords
Phase rotation; Index modulation; Non-orthogonal multiple access; Sum rate; Superposed signal;
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