Abstract:
We study a virtual full-duplex (VFD) non-orthogonal-multiple-access (NOMA) system in which a source S transmits one message each to users R1 and R2, and two messages to a...Show MoreMetadata
Abstract:
We study a virtual full-duplex (VFD) non-orthogonal-multiple-access (NOMA) system in which a source S transmits one message each to users R1 and R2, and two messages to a destination D, in three time slots. In conventional VFD-NOMA, S follows a fixed sequence of transmission (SoT) for the messages of users and destination, leading to a higher outage probability (OP) at R2 and D, and a higher overall system OP (O-OP). To this end, we propose a novel transmission scheme which significantly decreases the OP at R2 and D, and the O-OP. We assume all the wireless links undergo Nakagami- {m} fading, and S only knows the instantaneous channel state information (CSI) of S-R1 and S-R2 links. We assume users suffer from imperfect successive interference cancellation (I-SIC) and residual inter-user interference (R-IUI). We derive closed-form results for the OP and show it matches with the simulations. Comparison with half-duplex and full-duplex multiple access schemes is done to demonstrate efficacy of the improved VFD-NOMA.
Published in: IEEE Communications Letters ( Volume: 27, Issue: 2, February 2023)