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• W2800545360 abstract "We consider the problem of recovering a high-dimensional structured signal from independent Gaussian linear measurements each of which is quantized to b bits. The focus is on a specific method of signal recovery that extends a procedure originally proposed by Plan and Vershynin for one-bit quantization to a multi-bit setting. At the heart of this paper is a characterization of the optimal trade-off between the number of measurements m and the bit depth per measurement b given a total budget of B = m · b bits when the goal is to minimize the expected ℓ <sub xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>2</sub> -error in estimating the signal. It turns out that the choice b = 1 is optimal for estimating the unit vector (direction) corresponding to the signal for any level of additive Gaussian noise before quantization as well as for a specific model of adversarial noise, whereas in a noiseless setting the choice b = 2 is optimal for estimating the direction and the norm (scale) of the signal. Moreover, Lloyd-Max quantization is shown to be an optimal quantization scheme with respect to ℓ <sub xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>2</sub> -estimation error. Our analysis is corroborated by the numerical experiments showing nearly perfect agreement with our theoretical predictions. This paper is complemented by an empirical comparison to alternative methods of signal recovery. The results of that comparison point to a regime change depending on the noise level: in a low-noise setting, the approach under study falls short of more sophisticated competitors while being competitive in moderate-and high-noise settings." @default.
• W2800545360 created "2018-05-17" @default.
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• W2800545360 date "2018-06-01" @default.
• W2800545360 modified "2023-10-16" @default.
• W2800545360 title "On the Trade-Off Between Bit Depth and Number of Samples for a Basic Approach to Structured Signal Recovery From <inline-formula> <tex-math notation=LaTeX>$b$ </tex-math> </inline-formula>-Bit Quantized Linear Measurements" @default.
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• W2800545360 doi "https://doi.org/10.1109/tit.2018.2826459" @default.
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