UAV Fluid-Antenna Channel Acquisition under Intra-Scan Channel Aging

2026-09-06

AI Summary

本文解决了无人机流体天线系统中因时序扫描导致的信道老化问题，通过动态估计、协方差信息增益和老化折扣方法优化探测位置和时间。

Abstract

Sequential sounding in UAV fluid-antenna systems (FASs) provides additional spatial information but delays transmission, causing earlier channel observations to age. This paper addresses the resulting information--freshness tradeoff by jointly determining where to probe and when to stop under blockwise hardware constraints. A dynamic Karhunen--Lo\`eve estimator aligns asynchronous measurements with the transmission state, covariance information gain selects feasible probe locations, and an age-discount identity with a local one-more-slot condition characterizes the covariance-level balance between information and freshness. Paired simulations show that temporal alignment recovers most of the lower-tail reliability lost by static stacking, covariance-aware probing ranks highest numerically among the evaluated policies, and optimized one-slot sounding becomes statistically competitive with two-slot alternatives at the highest tested mobility. Within the evaluated schedule family, increasing mobility shifts the competitive operating region toward shorter scans, supporting joint probe-placement and sounding-duration design.

Problem

• UAV
• Fluid-Antenna Systems
• Channel Aging
• Information-Freshness Tradeoff
• Sequential Sounding

Innovation

• dynamic Karhunen-Loève estimator
• covariance information gain
• age-discount identity