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Digital pre-distortion method and device

A digital predistortion and predistortion technology, applied in the field of digital predistortion, can solve the problems of high predistortion processing rate, poor consistency, increased hardware resources, etc., and achieve the effect of improving processing consistency, reducing requirements, and reducing processing rate.

Active Publication Date: 2016-07-13
ZTE CORP
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The main technical problem to be solved by the present invention is to provide a method and device for digital pre-distortion, which can solve the problem of increased hardware resources and poor consistency between frequency bands caused by the use of analog filters in existing pre-distortion methods to separate the frequency bands of feedback distortion data. And the technical problem of high pre-distortion processing rate caused by the realization of pre-distortion in digital intermediate frequency

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  • Digital pre-distortion method and device
  • Digital pre-distortion method and device

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Embodiment 1

[0072] Considering that the existing pre-distortion method uses an analog filter to separate the frequency bands of the feedback distortion data, which leads to the increase of hardware resources, the poor consistency between the frequency bands, and the technical problems of high pre-distortion processing rate due to the realization of pre-distortion at the digital intermediate frequency, this embodiment provides a method of digital predistortion such as figure 1 shown, including the following steps:

[0073] Step 101: Perform digital predistortion processing on the baseband signals of each frequency band in the broadband multi-band signal by querying the corresponding multi-dimensional pre-distortion look-up table, and generate digital pre-distortion signals of each frequency band.

[0074] In the method of this embodiment, the broadband multi-band signal contains baseband signals of multiple frequency bands. The method of this embodiment performs digital pre-distortion proc...

Embodiment 2

[0110] This embodiment provides a digital predistortion device, which is suitable for ultra-wideband multi-band signals, such as figure 2 As shown, it includes: N multi-dimensional digital pre-distortion modules, N digital up-conversion modules, frequency shifting and combining modules, multi-stage frequency selection modules, N digital down-conversion modules and adaptive algorithm modules;

[0111] The baseband single / multi-carrier CFR signals XA-XN at zero frequency in each frequency band are used as input signals of the multi-dimensional digital predistortion DPDA-DPDN. Multi-dimensional index generation and table lookup operations are completed inside the pre-distortion module to obtain multi-band baseband pre-distortion signals XdpdA-XdpdN. After the baseband predistortion of each frequency band, the signal is digitally up-converted fA-up-converted fN and frequency-shifted, and finally the IF broadband multi-band predistortion signal Xdpd is obtained.

[0112] Such as ...

Embodiment 3

[0129] This embodiment describes the specific process of applying the method of the present invention to the dual-band scenario of the transmission link of the communication system, such as Figure 5 As shown, this embodiment provides a digital pre-distortion system, including: a multi-dimensional digital pre-distortion module, a digital up-conversion module, a frequency shift combination module, a DAC module, a power amplifier module, a coupler, an attenuator, and an ADC module , other digital processing algorithms, multi-level frequency selection module, digital down-conversion module and adaptive algorithm module; the specific pre-distortion process is as follows:

[0130] Step 1, the dual-band baseband signal passes through the multi-dimensional digital pre-distortion modules DPD1 and DPD2 to obtain a dual-band baseband pre-distortion signal.

[0131] Step 2, the dual-band pre-distortion signals are respectively digitally up-converted to obtain high-speed pre-distortion si...

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Abstract

The invention discloses a digital pre-distortion method and device. The method comprises the steps: carrying out the digital pre-distortion processing of baseband signals of a broadband multiband signal at all frequency bands through searching a corresponding multi-dimensional pre-distortion lookup table, and generating digital pre-distortion signals at all frequency bands; respectively carrying out the digital up-conversion of baseband digital pre-distortion signals at all bands, and generating intermediate frequency digital pre-distortion signals at all bands; carrying out the frequency shift path combination of the intermediate frequency digital pre-distortion signals at all bands, and generating a broadband multiband path combination pre-distortion signal; carrying out the multistage frequency selection of the feedback broadband multiband path combination pre-distortion signal, and separating the distortion feedback signals at all bands step by step; and updating the multi-dimensional pre-distortion lookup table corresponding to the frequency band according to the distortion feedback signal and the baseband signal of the frequency band before pre-distortion. Compared with the prior art, the method can reduce the hardware resources, improves the inter-band processing consistency, and reduces the DPD processing rate.

Description

technical field [0001] The present invention relates to the field of digital signal processing, in particular to a digital predistortion method and device. Background technique [0002] In mobile communication systems, many analog devices, especially power amplifiers, have nonlinear effects, resulting in in-band distortion and out-of-band spectrum expansion. In-band distortion degrades system performance, and out-of-band spectrum spread interferes with adjacent channels. At present, the methods to reduce nonlinear effects mainly include power back-off technology, envelope elimination and recovery technology, feed-forward linearization technology and digital pre-distortion technology. Among them, the power backoff will sacrifice the efficiency of the power amplifier. The feedforward linearization technology has a complex structure, high cost and poor adaptability, while the digital predistortion technology has high stability, wide applicable bandwidth, and low implementation...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L25/49
CPCH04L25/49
Inventor 袁静戴征坚潘卫明
Owner ZTE CORP
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