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arXiv 2601.12482eess.SP
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在一位量化系统中噪声相关性对MMSE信道估计的影响

The Effect of Noise Correlation on MMSE Channel Estimation in One-Bit Quantized Systems

Centre for Wireless Communications, University of Oulu(奥卢大学无线通信中心)

Minhua Ding, Prathapasinghe Dharmawansa, Italo Atzeni, Antti Tölli

AI总结:

本文研究了一位量化系统中噪声相关性对MIMO信道MMSE估计的影响,推导了新的解析表达式,并发现噪声相关性在不同信道相关性条件下对性能有显著影响。

摘要:

本文分析了空间相关加性噪声对从一位量化观测中多输入多输出(MIMO)信道的最小均方误差(MMSE)估计的影响。尽管在实际场景中加性噪声可以相关,例如由于干扰、杂波或其他外部干扰,但此前的工作中尚未探索此类相关性对这种设置中MMSE信道估计器的影响。在此背景下,我们推导出一个新颖的解析表达式,用于一般的MIMO MMSE信道估计器,该估计器本质上在一位观测中是非线性的,并且能够容纳任意的信道和噪声相关结构。为进一步表征噪声相关性的影响,我们随后将一般的MMSE表达式专门化到某些可处理的多天线配置中,在这些配置中,信道和噪声均假设为单参数常相关结构。我们的分析揭示了非平凡的、由噪声相关性引起的场景,在这些场景中,即使信道和噪声相关参数非零,估计器仍保持线性。此外,结果表明,在低至中等信号噪声比下,当信道不相关时,噪声相关性可以提高MMSE性能,但在信道强相关时会降低性能。

英文摘要:

This paper analyzes the impact of spatially correlated additive noise on the minimum mean-square error (MMSE) estimation of multiple-input multiple-output (MIMO) channels from one-bit quantized observations. Although additive noise can be correlated in practical scenarios, e.g., due to jamming, clutter, or other external disturbances, the effect of such correlation on the MMSE channel estimator in this setting remains unexplored in prior work. Against this backdrop, we derive a novel analytical expression for the general MIMO MMSE channel estimator, which is inherently nonlinear in one-bit observations, and accommodates arbitrary channel and noise correlation structures. To further characterize the impact of noise correlation, we subsequently specialize the general MMSE expression to certain tractable multi antenna configurations in which both the channel and the noise assume single-parameter constant correlation structures. Our analyses reveal nontrivial, noise-correlation-induced scenarios in which the estimator remains linear despite non-zero channel and noise correlation parameters. Moreover, the results indicate that, at low-to-medium signal-to-noise ratio, noise correlation improves the MMSE performance when channels are uncorrelated, but degrades performance when channels are strongly correlated.

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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