论文标题
FRI信号的模型采样
Modulo Sampling of FRI Signals
论文作者
论文摘要
在模拟信号采样期间,模数转换器(ADC)的动态范围至关重要。抽样之前的模量操作可用于增强ADC的有效动态范围。此外,ADC的采样率也起着至关重要的作用,因此希望减少它。在许多应用中无处不在的有限速率创新(FRI)信号模型可用于降低采样率。在FRI采样的模型折叠的背景下,与创新率(ROI)相比,现有作品以非常高的采样率运行,并且与FRI信号的自由度(DOF)相比,需要大量样品。此外,这些方法使用了实际上不可行的无限长度过滤器。我们考虑了Modulo框架下的紧凑型内核的周五抽样问题。我们得出理论保证,并表明可以通过在投资回报率上面的采样来识别周围信号。可识别性的样品数量等于DOF。我们提出了一种实用算法来估计来自模量样品的FRI参数。我们表明,与现有技术相比,所提出的方法在以最低的样本和采样率下运行时估计周五参数的误差最低。结果有助于设计FRI信号的具有成本效益的高动力范围ADC。
The dynamic range of an analog-to-digital converter (ADC) is critical during sampling of analog signals. A modulo operation prior to sampling can be used to enhance the effective dynamic range of the ADC. Further, sampling rate of ADC too plays a crucial role and it is desirable to reduce it. Finite-rate-of-innovation (FRI) signal model, which is ubiquitous in many applications, can be used to reduce the sampling rate. In the context of modulo folding for FRI sampling, existing works operate at a very high sampling rate compared to the rate of innovation (RoI) and require a large number of samples compared to the degrees of freedom (DoF) of the FRI signal. Moreover, these approaches use infinite length filters that are practically infeasible. We consider the FRI sampling problem with a compactly supported kernel under the modulo framework. We derive theoretical guarantees and show that FRI signals could be uniquely identified by sampling above the RoI. The number of samples for identifiability is equal to the DoF. We propose a practical algorithm to estimate the FRI parameters from the modulo samples. We show that the proposed approach has the lowest error in estimating the FRI parameters while operating with the lowest number of samples and sampling rates compared to existing techniques. The results are helpful in designing cost-effective, high-dynamic-range ADCs for FRI signals.