Digital predistortion processing method and digital predistortion processing system

A technology of digital pre-distortion and processing methods, applied in the field of communication, can solve problems such as delay jitter, failure to improve DPD effect, difficulty in measuring link loopback time, etc., to achieve the effect of ensuring consistency

Active Publication Date: 2013-04-17
DATANG MOBILE COMM EQUIP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, after the pre-distortion synchronization, it is not mentioned whether to further out-of-sync processing and correction of the synchronized signal, so it is impossible to improve the DPD effect through delay
[0016] Since the input signal is usually a low-speed baseband signal, but digital pre-distortion needs to work at a high rate, it is necessary to interpolate and filter the input baseband signal to increase the rate of the input signal. In order to obtain a better pre-distortion effect, it is usually

Method used

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  • Digital predistortion processing method and digital predistortion processing system
  • Digital predistortion processing method and digital predistortion processing system
  • Digital predistortion processing method and digital predistortion processing system

Examples

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Example Embodiment

[0060] Example one:

[0061] figure 1 Shown is a flowchart of a digital predistortion processing method of this embodiment, and the method includes:

[0062] S101: Extract the predistortion parameter corresponding to the input signal from the predistortion coefficient parameter table to perform predistortion processing on the input signal to obtain a forward transmission signal;

[0063] S102: Perform power amplification processing on the forward transmission signal to obtain an output signal;

[0064] S103: Collect the output signal to obtain a feedback signal;

[0065] S104: Delay a predetermined number of sampling points to collect the forward transmission signal to obtain a reference signal;

[0066] S105: Perform synchronous correlation operations on the reference signal and the feedback signal, and calibrate the feedback signal;

[0067] S106: Training the predistortion coefficient according to the reference signal and the calibrated feedback signal;

[0068] S107: Form a predistort...

Example Embodiment

[0070] Embodiment two:

[0071] figure 2 Shown as a flowchart of a digital predistortion processing method of this embodiment.

[0072] The method described in this embodiment includes the following steps:

[0073] S201: Extract the predistortion parameter corresponding to the input signal from the predistortion coefficient parameter table and perform predistortion processing on the input signal to obtain a forward transmission signal;

[0074] S202: Perform power amplification processing on the forward transmission signal to obtain an output signal;

[0075] S203: Collect the output signal, in order to maintain power balance, eliminate the rated linear gain of the power amplifier, and obtain a feedback signal;

[0076] S204: Delay M sampling points to collect the forward transmission signal to obtain a reference signal, where M is an integer between -5 and 5, preferably M is 1 or 2;

[0077] S205: Determine the power of the feedback signal. If the power of the feedback signal is not low...

Example Embodiment

[0127] Embodiment three:

[0128] Figure 8 Shown here is a schematic structural diagram of a digital predistortion processing system recorded in this embodiment, which is used to implement the method of Embodiment 1 or Embodiment 2, which includes:

[0129] The predistortion processor 301 is configured to extract the predistortion parameter corresponding to the input signal from the predistortion coefficient parameter table to perform predistortion processing on the input signal to obtain a forward transmission signal;

[0130] The digital-to-analog converter and the radio frequency transmitting channel 302 are used to perform digital-to-analog conversion of the forward transmission signal and send it to the power amplifier 303;

[0131] The power amplifier 303 is configured to amplify the power of the forward transmission signal after the digital-to-analog conversion conversion to obtain an output signal;

[0132] The radio frequency receiving channel and the analog-to-digital convert...

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Abstract

The invention discloses a digital predistortion processing method and a digital predistortion processing system. The method comprises the following steps of: extracting a predistortion parameter corresponding to an input signal from a predistortion coefficient parameter list and performing predistortion processing on the input signal, so as to obtain a forward sending signal; performing energy amplification processing on the forward sending signal so as to obtain an output signal; collecting the output signal to obtain a feedback signal; delaying on a preset amount of sampling points and collecting the forward sending signal, so as to obtain a reference signal; performing synchronous relevant operation on the reference signal and the feedback signal, and calibrating the feedback signal; training a predistortion coefficient according to the reference signal and the calibrated feedback signal; and forming a predistortion coefficient parameter list according to the predistortion coefficient and the amplitude value of the input signal. According to the embodiment of the invention, a preset amount of sampling points for transmitting signals are delayed, so that the radio frequency index ACPR (Adjacent Channel Power Ratio) is greatly improved.

Description

technical field [0001] The present invention relates to the technical field of communications, in particular to a digital predistortion processing method and system. Background technique [0002] In a wireless communication system, it is often required that the output of a power amplifier (PowerAmplifier, PA) has high linearity to meet the stringent requirements of the air interface standard, but the efficiency of the linear PA is very low and very expensive, while the high-efficiency nonlinear PA will Intermodulation components such as 3rd, 5th, and 7th orders are generated, which will interfere with adjacent channels. In order to improve the output efficiency of the PA and reduce the cost as much as possible, the nonlinear characteristics of the PA must be corrected, and it is a good choice to perform pre-distortion processing on the input signal of the PA. [0003] The essence of digital predistortion (Digital Predistortion, DPD) is to perform predetermined anti-distorti...

Claims

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Application Information

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IPC IPC(8): H04L25/49
CPCH04L25/49H04L27/368H04B1/0475H04B1/62H04B2001/0433H03F1/3247
Inventor 熊军张永丽薛斌
Owner DATANG MOBILE COMM EQUIP CO LTD
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