BER Minimization by User Pairing in Downlink NOMA Using Laser Chaos-Based MAB Algorithm

Non-Orthogonal Multiple Access (NOMA) is the technology that allows multiple users’ downlink communications to be transmitted in the same resource block by proper user pairing. In realizing real-time operations, an ultrafast pairing decision scheme is required. Previous studies have shown that decision making using laser chaos is ultra-fast and effective as a Multi-Armed Bandit (MAB) algorithm. In this paper, we demonstrate user pairing using laser chaos-based MAB algorithm on the basis of the bit error rate of the physical layer. That is, we define the conditions for successful or failed communication by bit error, leading to benefits from the efficient decision-making ability of the laser chaos-based MAB strategy. The numerical results show that the proposed method provides better performances than conventional ones, C-NOMA and UCGD-NOMA.