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arXiv 2212.04470cs.ITeess.SPmath.IT
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关于单比特量化系统中均方误差最优估计器

On the Mean Square Error Optimal Estimator in One-Bit Quantized Systems

Benedikt Fesl, Michael Koller, Wolfgang Utschick

AI总结:

本文研究了单比特量化系统中均方误差最优条件均值估计器,分析了其与Bussgang估计器的关系,提出最优导频序列并推导了MSE的闭式表达式及渐近极限。

摘要:

本文研究了在联合高斯输入的信道估计背景下,单比特量化系统中均方误差(MSE)最优的条件均值估计器(CME)。我们分析了一般非线性的CME与基于Bussgang定理的著名线性Bussgang估计器之间的关系。我们强调了一个新观察:在不同特殊情况下,Bussgang估计器等于CME,包括单变量高斯输入情况以及量化前无加性噪声的多导频信号情况。对于一般情况,我们进行了数值模拟以量化Bussgang估计器与CME之间的差距。该差距在更高维度和更长导频序列下增大。受CME启发,我们提出了一种最优导频序列,并推导了该情况下的新MSE闭式表达式。随后,我们在渐近大导频数机制下找到了MSE的闭式极限,该极限同样适用于Bussgang估计器。最后,我们针对各种系统参数和不同性能指标进行了数值实验,阐明了量化机制下最优信道估计器的行为。在此背景下,可以量化量化系统中出现的著名随机共振效应。

英文摘要:

This paper investigates the mean square error (MSE)-optimal conditional mean estimator (CME) in one-bit quantized systems in the context of channel estimation with jointly Gaussian inputs. We analyze the relationship of the generally nonlinear CME to the linear Bussgang estimator, a well-known method based on Bussgang's theorem. We highlight a novel observation that the Bussgang estimator is equal to the CME for different special cases, including the case of univariate Gaussian inputs and the case of multiple pilot signals in the absence of additive noise prior to the quantization. For the general cases we conduct numerical simulations to quantify the gap between the Bussgang estimator and the CME. This gap increases for higher dimensions and longer pilot sequences. We propose an optimal pilot sequence, motivated by insights from the CME, and derive a novel closed-form expression of the MSE for that case. Afterwards, we find a closed-form limit of the MSE in the asymptotically large number of pilots regime that also holds for the Bussgang estimator. Lastly, we present numerical experiments for various system parameters and for different performance metrics which illuminate the behavior of the optimal channel estimator in the quantized regime. In this context, the well-known stochastic resonance effect that appears in quantized systems can be quantified.

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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