Digital pre-distortion correction method and device with low sampling rate feedback

A technology of digital pre-distortion and low sampling rate, which is applied to parts of amplification devices, improved amplifiers to reduce nonlinear distortion, electrical components, etc., can solve problems such as increasing system overhead, and reduce bandwidth requirements and sampling rate requirements, The effect of the simple extraction process

Pending Publication Date: 2021-11-05
UNIV OF ELECTRONIC SCI & TECH OF CHINA
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Problems solved by technology

When considering K=5th order nonlinearity, a feedback channel with 5 times the sampl

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  • Digital pre-distortion correction method and device with low sampling rate feedback
  • Digital pre-distortion correction method and device with low sampling rate feedback
  • Digital pre-distortion correction method and device with low sampling rate feedback

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[0045] The technical solutions of the present invention will be described in detail below with reference to the accompanying drawings, but the scope of the invention is not limited to the following.

[0046] like figure 2 As shown, a digital predistortion correction method of low sample rate feedback includes the following steps:

[0047] S1. Baseband Source Generate Source Signal X = [x (1), (2), ..., X (N)] T , The X source signal is digitally converted, and the amplifier is sent after the upper frequency is converted.

[0048] S2. The signal input band pass filter in the power amplifier is filtered, so that only the range of extracted distortion bands that are desired in the signal after the filter processing is stored;

[0049] S3. Change the signal after the filter processing to the baseband, and the modulus is converted to obtain a digital signal to be distant, it is Y = [Y (1), Y (2), ..., y (n) ] T ;

[0050] S4. According to the source signal X and the outer distortion di...

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Abstract

The invention discloses a digital pre-distortion correction method and device with low sampling rate feedback. The method comprises the following steps: S1, generating a signal source signal x = [x(1), x(2),..., x(N)] T by a baseband signal source, performing digital-to-analog conversion and up-conversion on the x signal source signal, and sending the x signal source signal into a power amplifier for amplification; s2, inputting the signal amplified by the power amplifier into a band-pass filter for filtering, so that only an out-of-band distortion frequency band range expected to be suppressed is stored in the filtered signal; s3, down-converting the filtered signal to a base band, and performing analog-to-digital conversion to obtain an out-of-band distorted digital signal which is recorded as y = [y(1), y(2),..., y(N)] T; s4, constructing a pre-distortion model with frequency selection characteristics, and calculating a pre-distortion coefficient vector c; s5, applying the pre-distortion coefficient vector c to a digital pre-distortion model with a frequency selection characteristic, and performing pre-distortion processing on the signal source signal. According to the invention, only out-of-band distortion in an expected suppression frequency band range can be stored in the signal after band-pass filtering, so that the requirement on the sampling rate is reduced.

Description

technical field [0001] The invention relates to digital pre-distortion technology, in particular to a digital pre-distortion correction method and device for low sampling rate feedback. Background technique [0002] Due to the nonlinearity of the power amplifier, spectral growth occurs at the output of the power amplifier, such as figure 1 shown. The generated frequency spectrum is also called out-of-band distortion, which interferes with adjacent channel communications, and must be suppressed to prevent violations of communication specifications. Therefore, digital pre-distortion technology is usually used to suppress out-of-band distortion. [0003] The traditional digital pre-distortion technology requires a feedback channel with a high sampling rate to collect the output signal of the power amplifier after spectral multiplication. When K=5th-order nonlinearity is considered, a feedback channel with a sampling rate five times larger than the signal bandwidth is require...

Claims

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Application Information

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IPC IPC(8): H03F1/32
CPCH03F1/3247
Inventor 夏翔杰刘颖邵士海唐友喜
Owner UNIV OF ELECTRONIC SCI & TECH OF CHINA
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