%X In this letter, we investigate a fluid antenna system (FAS)-assisted downlink non-orthogonal multiple access (NOMA) for short-packet communications. The base station (BS) adopts a single fixed antenna, while both the central user (CU) and the cell-edge user (CEU) are equipped with a FAS. Each FAS comprises N flexible positions (also known as ports), linked to N arbitrarily correlated Rayleigh fading channels. We derive expressions for the average block error rate (BLER) of the FAS-assisted NOMA system and provide asymptotic BLER expressions. We determine that the diversity order for CU and CEU is N , indicating that the system performance can be considerably improved by increasing N . Simulation results validate the great performance of FAS.
%O This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions.
%I Institute of Electrical and Electronics Engineers (IEEE)
%L discovery10188057
%K Block error rate (BLER); flexible-position antenna; 
fluid antenna system (FAS); non-orthogonal multiple access (NOMA); 
short-packet communication
%J IEEE Transactions on Vehicular Technology
%P 1-6
%D 2024
%A Jianchao Zheng
%A Tuo Wu
%A Xiazhi Lai
%A Cunhua Pan
%A Maged Elkashlan
%A Kai-Kit Wong
%T FAS-assisted NOMA Short-Packet Communication Systems