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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 sampling rate of the signal bandwidth is required, which will increase the system overhead

Method used

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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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Embodiment Construction

[0045] The technical solution of the present invention will be further described in detail below in conjunction with the accompanying drawings, but the protection scope of the present invention is not limited to the following description.

[0046] Such as figure 2 As shown, a low sampling rate feedback digital pre-distortion correction method, including the following steps:

[0047] S1. Baseband source generates source signal x=[x(1),(2),...,x(N)] T , after digital-to-analog conversion and up-conversion, the x source signal is sent to the power amplifier for amplification;

[0048] S2. Inputting the signal amplified by the power amplifier into a band-pass filter for filtering processing, so that only the out-of-band distortion frequency range expected to be suppressed is preserved in the filtered signal;

[0049] S3. Down-convert the filtered signal to baseband, and perform analog-to-digital conversion to obtain an out-of-band distorted digital signal, which is denoted as y...

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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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