arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新,休息一下吧,周末愉快~~
arXiv 2206.02480cs.ITmath.ITmath.STstat.TH
收藏

子空间相位恢复

Subspace Phase Retrieval

Mengchu Xu, Dekuan Dong, Jian Wang

AI总结:

提出子空间相位恢复 SPR 算法,利用仅幅度高斯样本恢复 k 稀疏复信号,并在特定能量条件下达到 Ω(k log n) 的信息论采样复杂度。

摘要:

近年来,相位恢复在统计学、应用数学和光学工程中受到广泛关注。本文提出一种称为子空间相位恢复(Subspace Phase Retrieval,SPR)的高效算法:当 n 维 k 稀疏复值信号 x 的最小非零元素满足 |x_min| = Ω(||x||/√k) 时,该算法可利用 Ω(k² log n) 个仅含幅度的高斯样本准确恢复 x。此外,若 x 中最重要的 √k 个元素的能量和与 ||x||² 相当,SPR 算法仅需 Ω(k log n) 个仅含幅度样本即可精确恢复 x,达到稀疏相位恢复的信息论采样复杂度。数值实验表明,与现有算法相比,该算法取得了最先进的重建性能。

英文摘要:

In recent years, phase retrieval has received much attention in statistics, applied mathematics and optical engineering. In this paper, we propose an efficient algorithm, termed Subspace Phase Retrieval (SPR), which can accurately recover an $n$-dimensional $k$-sparse complex-valued signal $\x$ given its $Ω(k^2\log n)$ magnitude-only Gaussian samples if the minimum nonzero entry of $\x$ satisfies $|x_{\min}| = Ω(\|\x\|/\sqrt{k})$. Furthermore, if the energy sum of the most significant $\sqrt{k}$ elements in $\x$ is comparable to $\|\x\|^2$, the SPR algorithm can exactly recover $\x$ with $Ω(k \log n)$ magnitude-only samples, which attains the information-theoretic sampling complexity for sparse phase retrieval. Numerical Experiments demonstrate that the proposed algorithm achieves the state-of-the-art reconstruction performance compared to existing ones.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑