arXiv:2611.11461 · v1

Sharp Rates for Optimal Recovery of Bandlimited Functions from Localized Oversampling

首次提交 2026-11-08 23:49

版本更新 2026-11-08 23:49

雷达观测 2026-11-10 12:16

摘要

It is well-known that one can recover a function $f$ bandlimited to $[-δ,δ]$ ( $0<δ<π$) from its finite sample data $f(j),-n\le j\le n$, with an approximation error exponentially decaying to zero as $n$ tends to infinity. Various regularized Shannon sampling formula have been proposed to achieve such exponential approximation. So far the best rate has been $$ O\biggl(\frac1{\sqrt{n}}\exp(-(π-δ)n)\biggr). $$ We establish that the optimal recovery algorithm in the worst-case scenario achieves an approximation error $ρ_{n,δ}$ satisfying $$ c_* \frac1{\sqrt{n}}(\tan\fracδ4)^{2n+1/2}\le ρ_{n,δ}\le C^* \frac1{\sqrt{n}}(\tan\fracδ4)^{2n+1/2}, \quad 0<δ\leqπ,\quad n\geq1, $$ where $c_*,C^*$ are positive constants independent of $n$ and $δ$. This result identifies the best possible exponential rate to reconstruct bandlimited functions from two-sided finite oversampling data. In other words, $$ ρ_{n,δ} \asymp \frac{\tan\fracδ4}{\sqrt{n}}\exp\bigl(-c_δ(π-δ)n\bigr), $$ where $c_δ$ is strictly decreasing on $(0,π]$ and $$ \lim_{δ\toπ^-}c_δ=1,\ \lim_{δ\to 0^+}c_δ=+\infty. $$ We also make the new finding that one can also reconstruct $f$ bandlimited to $[-δ,δ]$ with exponentially decaying error from one-sided sample data $f(j)$, $1\le j\le n$, and the sharp rate of approximation error $ρ_{n,δ}'$ of the optimal algorithm is $$ ρ_{n,δ}' \asymp \sqrt{δ/π}\sin^n(δ/2). $$