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Digital predistortion time delay estimation method and device, and terminal

A technology of digital predistortion and time delay estimation, which is applied in the field of communication to achieve the effect of reducing the amount of calculation and making calculation simple

Inactive Publication Date: 2018-12-04
SPREADTRUM COMM (SHANGHAI) CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The technical problem solved by the invention is to reduce the resource consumption of the delay estimation method

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  • Digital predistortion time delay estimation method and device, and terminal
  • Digital predistortion time delay estimation method and device, and terminal
  • Digital predistortion time delay estimation method and device, and terminal

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Embodiment Construction

[0041] As mentioned earlier, digital pre-distortion is a widely used linearization technology, also known as "pre-correction" and "pre-distortion" (Digital Pre-Distortion, DPD). In the digital domain, the input signal is distorted opposite to the nonlinear characteristics of the nonlinear device to achieve the effect of canceling the nonlinear characteristics of the nonlinear device.

[0042] In the process of obtaining the predistortion parameters, it is necessary to align the transmitted signal and the feedback signal, so it is necessary to estimate the time delay of the transmitted signal.

[0043] An algorithm for time delay estimation is a sliding window algorithm, which stores the amplitude values ​​of the input signal and the feedback signal in registers of a certain length. The length of the input signal can usually be L, and the length of the feedback signal can usually be 2L. Based on the input signal, slide on the feedback signal, and calculate the sum of the absolu...

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Abstract

Disclosed are a digital predistortion time delay estimation method and device, and a terminal. The method comprises the following steps: coupling a signal to be sent to an antenna in response to transmitting a training sequence in order to obtain a feedback signal, wherein the feedback signal comprises a feedback sequence, and the feedback sequence is associated with the training sequence; performing correlation calculation of the feedback signal and a preset sequence point by point in response to transmitting the training sequence in order to obtain a correlation result, wherein the preset sequence and the training sequence are same; and determining a digital predistortion time delay according to the correlation result. Resource consumption can be reduced through the technical scheme of the invention.

Description

technical field [0001] The present invention relates to the communication field, in particular to a digital predistortion delay estimation method, device and terminal. Background technique [0002] With the development of wireless communication technology, the signal transmission rate continues to increase. In wireless communication technology, higher modulation rates are widely used, for example, orthogonal frequency division multiplexing, 265 quadrature amplitude modulation (Quadrature Amplitude Modulation, QAM) Wait. As the peak-to-average ratio of the signal continues to increase, in order to ensure the correct transmission of data, the linearity of the radio frequency device is required to be high. In the radio frequency link, the power amplifier (PowerAmplitfier, PA) is an important source of nonlinearity. [0003] Digital pre-distortion is a widely used linearization technology, also known as "pre-distortion" and "pre-distortion" (Digital Pre-Distortion, DPD). It is...

Claims

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Application Information

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IPC IPC(8): H04L25/49
CPCH04L25/49
Inventor 林颢刘鑫洪波李俊强
Owner SPREADTRUM COMM (SHANGHAI) CO LTD