Performance Analysis of Pinching Antenna Systems Enabled NOMA Communications

Abstract

Pinching antenna systems (PASS) have the advantages in the perspective of flexible antenna reconfiguration, line-of-sight (LoS) creation, and scalability features. To highlight the ascendancy of PASS, we survey the integration of PASS into non-orthogonal multiple access (NOMA) networks. The locations of nodes are randomly distributed within a circular coverage region. The influencing factors of LoS and none-line-of-sight (NLoS) propagation links from PASS to non-orthogonal nodes are taken into consideration. To characterize performance of PASS-NOMA, we deduce the outage probability and ergodic data rates expressions of two nodes over LoS/NLoS fading channels. In light of these theoretical results, the formally unbounded diversity gains are also characterized with node n under ideal successive interference cancellation (ISIC) and node f over LoS links, when the SNR exceeds a finite threshold. The slopes of ergodic data rate for node n with ISIC equals to one and that of node f presents a zero slope. In addition, the PASS-NOMA system throughput are evaluated in different transmission modes. It is shown from the numerical results that: 1) The outage behaviors of PASS-NOMA networks under LoS/NLoS conditions outperform that of PASS aided orthogonal multiple access (OMA) networks and that of conventional antenna systems (CASS) aided OMA/NOMA networks; 2) The employment of PASS enables the larger ergodic data rates relative to PASS-OMA and CASS-OMA/NOMA networks; and 3) As the quantity of communication radius and PASS' height rises, the performance of PASS-NOMA networks are declined at a certain extent.

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