Estimation method for signal delay time of digital pre-distortion system

Abstract

An estimation method for signal delay time of a digital pre-distortion system, comprising the following steps of: firstly, respectively performing interpolation on input signal sample data and output signal sample data of a power amplifier through a third order spline interpolation method, so as to cause that the processed input signal sample data and output signal sample data have equal sample transmission rate; after finishing the interpolation operation, extracting N sample data from the interpolated signal sample data, extracting 2N corresponding sample data from the interpolated output signal sample data, and then, performing time delay estimation on the two groups of data (the n sample data of the input signal and the 2N sample data of the output signal) through a delay estimation algorithm based on addition and subtraction, thereby implementing synchronization between the sample data of the output signal and the sample data of the input signal. With the estimation method for signal delay time of the digital pre-distortion system, operation complexity is obviously reduced, precision and accuracy of calculation are both high, and the delay time of the signal in the pre-distortion system can be accurately estimated.

Description

technical field [0001] The invention relates to a method for estimating transmission time delay in a communication transmitting circuit, in particular to a method for estimating signal delay time in a digital predistortion system, and belongs to the technical field of digital signal processing. Background technique [0002] With the continuous development of modern communication technology, the capacity requirements of the communication system are also increasing. In order to efficiently utilize limited spectrum resources in modern communication systems, modulation methods (such as M-QAM) and transmission technologies (such as OFDM, WCDMA) with high spectrum utilization efficiency have been widely used. However, these modulation methods and transmission technologies have common characteristics, that is, the signal envelope fluctuates greatly, the peak-to-average ratio is high, and severe distortion will occur after being amplified by a nonlinear RF power amplifier. These di...

AI Technical Summary

Problems solved by technology

[0014] The above method has high computational complexity and a large amount of computation

However, the digital predistortion system requires high signal processing rate, so the above method is difficult to apply in practice.

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