Pinching-Antenna-based Communications: Spectral Efficiency Analysis and Deployment Strategies
Mengyu Qian, Xidong Mu, Li You, Michail Matthaiou

TL;DR
This paper analyzes spectral efficiency of pinching-antenna-based multi-user systems with centralized and distributed deployment strategies, providing insights into their performance in different SNR regimes and guiding deployment choices.
Contribution
It introduces analytical models for spectral efficiency of both deployment strategies, comparing their performance and revealing conditions where each is preferable.
Findings
Distributed deployment outperforms centralized at high SNRs.
Centralized deployment is better suited for low SNRs.
Stationary phase method effectively approximates spectral efficiency.
Abstract
A multiple-waveguide pinching-antenna (PA)-based multi-user communication system is investigated. With a given number of PAs, two deployment strategies are considered, namely the centralized PA deployment, where all PAs are switched between waveguides to serve users in a time-division manner to avail of beamforming gain, and the distributed PA deployment, where a single PA is deployed on each waveguide to simultaneously serve multiple users by leveraging the multiplexing gain. The spectral efficiency (SE) achieved by each deployment strategy is analyzed: i) For the centralized deployment, the positioning strategy of PAs on each waveguide is determined first with the aim of maximizing the channel gain of the corresponding nearest served user. Based on this, the corresponding system SE is derived. ii) For the distributed deployment, the system SE under the maximum ratio transmission (MRT)…
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