Performance Analysis of Pinching Antenna Systems Enabled NOMA Communications

2026-04-28

AI Summary

This work addresses the challenging coexistence of line-of-sight (LoS)/non-line-of-sight (NLoS) propagation and signal blockage by introducing, for the first time, a reconfigurable pinched antenna system (PASS) into non-orthogonal multiple access (NOMA) networks. Leveraging stochastic geometry to model node distributions within a circular region and incorporating realistic LoS/NLoS channel characteristics alongside non-ideal successive interference cancellation (NISIC), the study derives closed-form expressions for outage probability and ergodic rate. The analysis reveals that near users benefit from unbounded diversity gain under LoS links. Results demonstrate that the proposed PASS-NOMA scheme significantly outperforms conventional orthogonal multiple access (OMA) by reducing outage probability and enhancing ergodic rate, with performance consistently improving as the number of pinched antennas increases.

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 line-of-sight (LoS) and non-line-of-sight (NLoS) propagation links from PASS to non-orthogonal nodes are taken into considered. To characterize performance of PASS-NOMA, we deduce the blockage probability and ergodic data rates expressions of two nodes over LoS/NLoS fading channels. In light of these theoretical results, the infinite diversity gain are also analyzed with near node n under non-ideal successive interference cancellation (NISIC) and far node f over LoS links. The slopes of ergodic data rate for node n with NISIC and node f were equal to zeros. In addition, the PASS-NOMA system throughput are evaluated in different transmission modes. It is shown from the numerical results that: 1) The blockage outage behaviors of PASS-NOMA networks with LoS/NLoS conditions outperform that of PASS aided traditional orthogonal multiple access (OMA); 2)The employment of PASS enables the larger ergodic data rates relative to PASS-OMA networks; and 3) As the quantity of pinching antennas rises, the performance of PASS-NOMA networks are enhanced over LoS/NLoS propagation links.

Problem

• Pinching Antenna Systems
• NOMA
• LoS/NLoS propagation
• blockage probability
• ergodic data rate

Innovation

• Pinching Antenna Systems
• NOMA
• LoS/NLoS propagation
• Ergodic data rate
• Non-ideal SIC