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Impact of Antenna Position Errors on TDMA and NOMA in Pinching-Antenna Systems
Abstract
Pinching-antenna systems (PASS) create reconfigurable wireless channels by moving dielectric antennas along a waveguide. Mechanical position errors translate into phase errors that degrade performance, yet almost all prior PASS studies assume ideal placement. This paper models this position error, derives the resulting phase error, and analyzes its impact on time-division multiple access (TDMA) and non-orthogonal multiple access (NOMA), obtaining their ergodic-rate bounds and closed-form outage probabilities. Analyses and simulations reveal that single-antenna TDMA is immune to position error, whereas multi-antenna TDMA loses array gain and NOMA suffers an interference floor that cannot be overcome by increasing transmit power.
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BibTeX
@misc{jiang2026impact,
title = {{Impact of Antenna Position Errors on TDMA and NOMA in Pinching-Antenna Systems}},
author = {Wei Jiang and Hans D. Schotten},
howpublished = {arXiv},
year = {2026},
month = sep,
doi = {10.48550/arxiv.2609.31088},
eprint = {2609.31088},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2609.31088},
}
RIS
TY - UNPB
TI - Impact of Antenna Position Errors on TDMA and NOMA in Pinching-Antenna Systems
AU - Wei Jiang
AU - Hans D. Schotten
PY - 2026
DA - 2026/09/25
PB - arXiv
DO - 10.48550/arxiv.2609.31088
UR - https://arxiv.org/abs/2609.31088
AB - Pinching-antenna systems (PASS) create reconfigurable wireless channels by moving dielectric antennas along a waveguide. Mechanical position errors translate into phase errors that degrade performance, yet almost all prior PASS studies assume ideal placement. This paper models this position error, derives the resulting phase error, and analyzes its impact on time-division multiple access (TDMA) and non-orthogonal multiple access (NOMA), obtaining their ergodic-rate bounds and closed-form outage probabilities. Analyses and simulations reveal that single-antenna TDMA is immune to position error, whereas multi-antenna TDMA loses array gain and NOMA suffers an interference floor that cannot be overcome by increasing transmit power.
ER -