5G를 위한 동적 대역폭 할당 NOMA-OMA

Abstract

Non-orthogonal multiple access (NOMA) is proposed as a promising candidate of radio access technologies for 5G and beyond. It exploits power domain multiplexing concept to increase capacity combined with successive interference cancellation (SIC). However, there could be a compatibility issue because legacy devices cannot perform SIC which is a necessary step for applying NOMA. In this paper, we suggest a new dynamic bandwidth adjusting algorithm for NOMA to provide the backward compatibility for orthogonal multiple access (OMA). The suggested algorithm can provide backward compatibility, efficient bandwidth allocation, and robustness against imperfect SIC. To verify the performance of suggested algorithm, sum capacity is compared to OMA and NOMA. Simulations are also performed under perfect and imperfect SIC to validate the effectiveness of suggested algorithm. It is shown that the proposed algorithm has 2 bps/Hz capacity higher than OMA.