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首页> 外文期刊>International journal of RF and microwave computer-aided engineering >New Estimation and Compensation Method for Quadrature Modulator and Demodulator Errors in Digital Predistortion System
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New Estimation and Compensation Method for Quadrature Modulator and Demodulator Errors in Digital Predistortion System

机译：数字预失真系统中正交调制器和解调器误差的估计和补偿新方法

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摘要

This article proposes a new method to estimate and compensate for the in-phase and quadrature (IQ) imbalance errors of the quadrature modulator (QM) and demodulator (QDM) without interrupting the transmission. It uses two groups of captured signals, which transmit through two feedback loops with different propagation delays, to separate and estimate the IQ imbalance errors. In comparison with the previous methods, the greatest advantage of the proposed method is that both compensators of the QM and QDM can be obtained without additional feedback loop, and then the digital predistorter can be designed without the disturbance of IQ imbalance errors. This method can improve the compensation performance of digital predistortion with lower costs and less complexity. Experimental results show the correctness and effectiveness of the proposed method.
机译：本文提出了一种在不中断传输的情况下估计和补偿正交调制器（QM）和解调器（QDM）的同相和正交（IQ）不平衡误差的新方法。它使用两组捕获的信号（分别通过具有不同传播延迟的两个反馈环路进行传输）来分离和估计IQ不平衡误差。与以前的方法相比，该方法的最大优势在于无需额外的反馈环路即可获得QM和QDM的两个补偿器，然后可以设计数字预失真器而不会干扰IQ不平衡误差。该方法可以降低成本，降低复杂度，从而提高数字预失真的补偿性能。实验结果表明了该方法的正确性和有效性。

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