论文标题
关于将错误反向传播应用于数字通信接收器的时间交错ADC的背景校准
On the Application of Error Backpropagation to the Background Calibration of Time Interleaved ADC for Digital Communication Receivers
论文作者
论文摘要
本文介绍了一种基于反向传播的技术，用于校准数字转换器（TI-ADC）的时间间隔类似物的不匹配错误。此技术适用于数字接收器，例如连贯的光学通信中使用的接收器。使用机器学习的众所周知的反向传播算法的修改版本处理接收器的切片机的错误。可以直接应用处理后的切片机误差以用自适应均衡器来补偿TI-ADC不匹配错误，也可以使用诸如延迟单元格和可编程增益放大器（PGA）等模拟技术（PGA）等模拟技术来数字估算和正确的所述不匹配错误。与先前的ART相比，此处提出的技术的主要优势是它的稳健性，其收敛速度以及它始终在后台模式下起作用，只要接收器收敛，就独立于过度采样因子和输入信号的特性。此外，该技术可实现传统Ti-ADC校准技术未解决的损害的联合补偿，例如正交调制接收器中的I/Q偏斜。提出了模拟以证明技术的有效性，并讨论了低复杂性实施方案。
This paper introduces a backpropagation-based technique for the calibration of the mismatch errors of time-interleaved analog to digital converters (TI-ADCs). This technique is applicable to digital receivers such as those used in coherent optical communications. The error at the slicer of the receiver is processed using a modified version of the well known backpropagation algorithm from machine learning. The processed slicer error can be directly applied to compensate the TI-ADC mismatch errors with an adaptive equalizer, or it can be used to digitally estimate and correct said mismatch errors using analog techniques such as delay cells and programmable gain amplifiers (PGA). The main advantages of the technique proposed here compared to prior art are its robustness, its speed of convergence, and the fact that it always works in background mode, independently of the oversampling factor and the properties of the input signal, as long as the receiver converges. Moreover, this technique enables the joint compensation of impairments not addressed by traditional TI-ADC calibration techniques, such as I/Q skew in quadrature modulation receivers. Simulations are presented to demonstrate the effectiveness of the technique, and low complexity implementation options are discussed.
