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Digital pre-distortion processing system with sample rate conversion and method thereof

A digital predistortion and processing system technology, applied in digital transmission systems, baseband systems, transmission systems, etc., can solve problems such as poor predistortion effect, poor digital predistortion processing method, and inaccurate predistortion function.

Active Publication Date: 2012-07-11
ZTE CORP
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, for the case where the sampling rate is less than 3 times the signal bandwidth, or even less than 2 times the signal bandwidth, the current digital pre-distortion processing method is not effective
For the case of multiple frequency bands, if the total bandwidth from the lower edge of the lowest frequency band to the upper edge of the highest frequency band reaches or exceeds 1 / 2 of the sampling rate, then the existing digital predistortion processing method is not effective.
[0005] In summary, the existing digital pre-distortion technology mainly has the following problems: When calculating the positive model function of the power amplifier or calculating the pre-distortion function or using the pre-distorter, it is necessary to use the higher-order terms of the sequence
The predistortion function obtained in this way is not accurate, resulting in poor predistortion effect

Method used

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  • Digital pre-distortion processing system with sample rate conversion and method thereof
  • Digital pre-distortion processing system with sample rate conversion and method thereof
  • Digital pre-distortion processing system with sample rate conversion and method thereof

Examples

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Embodiment 1

[0083] figure 1 A schematic composition diagram of a digital pre-distortion processing system for converting a sampling rate according to an embodiment of the present invention is shown. The digital pre-distortion processing system 800 for changing the sampling rate in this embodiment is mainly composed of a power amplifier inverse model solution module 700 for changing the sampling rate and a digital pre-distortion module 100 for changing the sampling rate.

[0084] The complex number sequence x of 1 times the sampling rate is first sent to the digital pre-distortion module 100 that converts the sampling rate, and the output sequence y of 1 times the sampling rate filter , after passing through the digital-to-analog converter 200 and the transmitting channel 300 successively, it is sent to the power amplifier 400 . A part of the power of the RF signal output by the power amplifier 400 is coupled to the feedback channel 500, and the sequence z is obtained after passing throug...

Embodiment 2

[0090] Figure 4 A schematic composition diagram of a power amplifier inverse model solution module 700 for converting a sampling rate according to another embodiment of the present invention is shown. The main difference between this embodiment and the foregoing embodiments is that the M-fold upsampling device is an integral module. Will figure 2 The M times interpolator 10 and the M times interpolation filter 20 are combined into M times interpolation and M times interpolation filter 70, and then M times decimation filter 40 and M times decimator 50 are combined into M times decimation filter and M times The extractor 80 can obtain this embodiment.

[0091] The sequence x of 1 times the sampling rate is first sent to the M times interpolation and the M times interpolation filter 70, and the sequence x of the output M times the sampling rate M，filter Send it to the sequence high-order item constructor 31, and output the sequence y of M times the sampling rate M Send to M...

Embodiment 3

[0095] Image 6 A schematic composition diagram of a sample rate converted power amplifier inverse model solving module 700 according to another embodiment of the present invention is shown. Will Figure 4 M times of interpolation and M times of interpolation filter 70 are replaced by M times of interpolation polyphase filter 70 with M branches 1 、70 2 ...70 M , then replace the M-fold decimation filter and the M-fold decimator 80 with an M-fold decimation polyphase filter 80 with M branches 1 , 80 2 ...80 M , and then copy the sequence high-order item constructor 31 into M sequence high-order item constructors 31 1 、31 2 ...31 M (place a sequence high-order item constructor 31 on each branch i of the polyphase filter i ), this embodiment can be obtained.

[0096] The sequence x of 1 times the sampling rate is first sent to the M times interpolation polyphase filter 70 with M branches 1 、70 2 ...70 M , respectively output the sequence x of 1 times the sampling rat...

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Abstract

The invention discloses a digital pre-distortion processing system with sample rate conversion and a method thereof. The system comprises: a power-amplifier anti-model solution module and a digital pre-distortion module. The power-amplifier anti-model solution module and the digital pre-distortion module both comprise a sample rate conversion apparatus. The sample rate conversion apparatus is used to convert a sequence with 1 times sample rate into the sequence with the multiple times sample rate and extract the sequence with the 1 times sample rate from the sequence with the multiple times sample rate. According to the invention, a spectrum aliasing phenomenon can be eliminated through a sample rate conversion method. A pre-distortion effect of transmitting a broadband or multiband signal through a non-linear channel can be effectively improved.

Description

technical field [0001] The invention relates to the field of digital signal processing, in particular to a digital pre-distortion processing system and method for converting sampling rate. Background technique [0002] In communication technology, improving the efficiency of power amplifier is an important index. The main way to improve the efficiency of the power amplifier is to make the power amplifier work as close to the saturation region or cut-off region as possible, but this will cause serious nonlinear distortion of the power amplifier. In order to solve the non-linear distortion problem of the power amplifier, the power back-off technology that leads to a decrease in efficiency is not a good choice, because the cost-effective feed-forward technology is not cost-effective. Therefore, digital pre-distortion technology with low cost and good performance has become the first choice. [0003] At present, for the case where the sample rate (Sample Rate) is 3 times or hi...

Claims

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Application Information

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IPC IPC(8): H04L25/49H03F1/32
CPCH04L25/03343
Inventor 林青春段义军潘卫明宁东方游爱民杨泽亮向际鹰
Owner ZTE CORP
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