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arXiv 1807.06976cs.ITeess.SPmath.ITmath.STstat.TH
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抖动Quantization亚高斯观测的广义Lasso

The Generalized Lasso for Sub-gaussian Measurements with Dithered Quantization

Christos Thrampoulidis, Ankit Singh Rawat

摘要:

在从高维线性观测值中恢复结构化信号的问题中,通常假设全精度测量是可用的。在这种假设下,流行的广义套索(G-Lasso)的恢复性能现在已经得到了很好的证实。在本文中,我们将这些类型的结果扩展到实际相关的设置与量化测量。我们研究了两个极端的量化方案,即均匀和一位量化;前者对量化位数没有限制,而第二只允许一位。在存在均匀抖动信号的情况下并且当测量向量是亚高斯时,我们表明相同的算法(即,G-Lasso)对于均匀和一比特量化方案都具有有利的恢复保证。我们的理论结果,阐明了抖动信号的值的范围的适当选择,并准确地捕获的问题参数的误差依赖。例如,我们的误差分析表明,与全精度测量相比,具有一位均匀抖动测量的G-Lasso仅导致对数速率损失。

英文摘要:

In the problem of structured signal recovery from high-dimensional linear observations, it is commonly assumed that full-precision measurements are available. Under this assumption, the recovery performance of the popular Generalized Lasso (G-Lasso) is by now well-established. In this paper, we extend these types of results to the practically relevant settings with quantized measurements. We study two extremes of the quantization schemes, namely, uniform and one-bit quantization; the former imposes no limit on the number of quantization bits, while the second only allows for one bit. In the presence of a uniform dithering signal and when measurement vectors are sub-gaussian, we show that the same algorithm (i.e., the G-Lasso) has favorable recovery guarantees for both uniform and one-bit quantization schemes. Our theoretical results, shed light on the appropriate choice of the range of values of the dithering signal and accurately capture the error dependence on the problem parameters. For example, our error analysis shows that the G-Lasso with one-bit uniformly dithered measurements leads to only a logarithmic rate loss compared to the full-precision measurements.

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。

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