采样抖动抑制的贝叶斯后处理方法
Bayesian Post-Processing Methods for Jitter Mitigation in Sampling
摘要：
即使在信号先验分布和加性噪声具有正态分布的情况下，来自被抖动（定时噪声）和加性噪声破坏的样本的信号的最小均方误差（MMSE）估计也是非线性的。本文提出了一种基于吉布斯抽样和切片抽样的随机算法来逼近贝叶斯公式中的最优MMSE估计。仿真结果表明，该非线性算法比线性MMSE估计有明显的改进，同时也比期望最大化算法逼近经典估计中的极大似然（ML）估计有明显的提高。通过有效的片外后处理来缓解抖动，可以容忍更大的抖动，从而潜在地降低片内ADC功耗。
英文摘要：
Minimum mean squared error (MMSE) estimators of signals from samples corrupted by jitter (timing noise) and additive noise are nonlinear, even when the signal prior and additive noise have normal distributions. This paper develops a stochastic algorithm based on Gibbs sampling and slice sampling to approximate the optimal MMSE estimator in this Bayesian formulation. Simulations demonstrate that this nonlinear algorithm can improve significantly upon the linear MMSE estimator, as well as the EM algorithm approximation to the maximum likelihood (ML) estimator used in classical estimation. Effective off-chip post-processing to mitigate jitter enables greater jitter to be tolerated, potentially reducing on-chip ADC power consumption.
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