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量化压缩感知用于部分随机循环矩阵

Quantized Compressed Sensing for Partial Random Circulant Matrices

Joe-Mei Feng, Felix Krahmer, Rayan Saab

AI总结:

本文首次分析了非平凡量化方案在压缩感知测量中的应用,针对由随机子高斯向量生成的循环矩阵随机选取行的压缩感知矩阵,采用稳定的Sigma-Delta量化方案和凸优化重建方法,证明量化误差随测量数多项式衰减,优于传统无记忆标量量化。

摘要:

我们首次对压缩感知测量中非平凡量化方案进行了分析,具体研究了由随机子高斯向量生成的循环矩阵随机选取行所构成的压缩感知矩阵。我们使用稳定的、可能为一比特的Sigma-Delta方案对测量进行量化,并采用基于凸优化的重建方法。我们证明了由于量化引起的重建误差随测量数多项式衰减。这与随机高斯或子高斯矩阵关联的Sigma-Delta量化类似结果一致,并显著优于传统假设的无记忆标量量化结果。此外,我们证明了我们的方法是稳定且鲁棒的;即在存在非量化噪声或底层信号不严格稀疏时,重建误差会渐进退化。分析依赖于关于子高斯混沌过程的结果以及McDiarmid不等式的变体。

英文摘要:

We provide the first analysis of a non-trivial quantization scheme for compressed sensing measurements arising from structured measurements. Specifically, our analysis studies compressed sensing matrices consisting of rows selected at random, without replacement, from a circulant matrix generated by a random subgaussian vector. We quantize the measurements using stable, possibly one-bit, Sigma-Delta schemes, and use a reconstruction method based on convex optimization. We show that the part of the reconstruction error due to quantization decays polynomially in the number of measurements. This is in line with analogous results on Sigma-Delta quantization associated with random Gaussian or subgaussian matrices, and significantly better than results associated with the widely assumed memoryless scalar quantization. Moreover, we prove that our approach is stable and robust; i.e., the reconstruction error degrades gracefully in the presence of non-quantization noise and when the underlying signal is not strictly sparse. The analysis relies on results concerning subgaussian chaos processes as well as a variation of McDiarmid's inequality.

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