Affine Frequency Division Multiplexing Based Power Domain Non-Orthogonal Multiple Access for Terahertz Channel

This study investigates the combination of AFDM and PD-NOMA for terahertz

(THz) communication systems. AFDM helps reduce the effects of Doppler spread

and multipath fading, while PD-NOMA improves spectrum utilization and allows

more users to communicate over the same resources. To further improve system

performance, two power allocation methods are considered: a channel state

information (CSI)-based dynamic power allocation scheme and a fixed power

allocation scheme. The proposed AFDM-assisted PD-NOMA system is evaluated

under realistic THz channel conditions, including high path loss, molecular

absorption, frequency selectivity, and high mobility. Simulation results show that the

proposed system provides better bit error rate (BER), throughput, and outage

probability performance compared with conventional NOMA and OFDM-based

NOMA systems.

• Supervision