A digital predistortion method and digital predistorter
A digital pre-distortion and preset algorithm technology, applied in the field of communication, can solve the problems of non-linear distortion correction of the output signal of the power amplifier and limited bandwidth of the feedback link, etc.
Active Publication Date: 2017-02-08
COMBA TELECOM SYST CHINA LTD
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Problems solved by technology
In practice, the traditional digital predistortion technology cannot correct the nonlinear distortion of the output signal of the power amplifier with high precision due to the limited bandwidth of the feedback link and the sampling accuracy of the digital-to-analog converter.
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[0029] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
[0030] Embodiments of the present invention provide a digital predistortion method, such as figure 1 As shown, the method includes:
[0031] 101. Acquire a feedback signal according to the output signal.
[0032] 102. Acquire a first baseband signal and a first feedback signal according to the baseband signal, the feedback signal, and a preset condition.
[0033] 103. Calculate and obtain an intermodulation item coefficient according to the first baseband si...
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The embodiment of the invention provides a digital pre-distortion method and a digital pre-distortion device, and relates to the field of communications. By means of the digital pre-distortion method and the digital pre-distortion device, non-linear distortion of a power amplifier can be corrected in a high-precision mode. According to the specific scheme, a feedback signal is obtained according to an output signal; a first base band signal and a first feedback signal are obtained according to a base band signal, the feedback signal and preset conditions; an inter-modulation item coefficient is worked out according to the first base band signal and the first feedback signal; a middle inter-modulation item coefficient is obtained, the inter-modulation item coefficient and the middle inter-modulation item coefficient are corresponding accumulated, and an updated inter-modulation item coefficient is obtained; an inter-modulation component is worked out according to the updated inter-modulation item coefficient and the first base band signal and the inter-modulation component and the base band signal are subtracted to generate an input signal; the input signal is input into the power amplifier to obtain an updated output signal; the steps are executed repeatedly. The digital pre-distortion method and the digital pre-distortion device are used for correcting non-linear distortion of the power amplifier.
Description
technical field [0001] The invention relates to the communication field, in particular to a digital predistortion method and a digital predistorter. Background technique [0002] With the development of the wireless communication industry, linear and multi-carrier modulation techniques are widely used in modern communication systems. When the peak-to-average ratio modulation signal passes through the power amplifier device, the nonlinear distortion of the output signal will be caused by the nonlinearity and memory effect of the power amplifier, which will expand the out-of-band spectrum and cause adjacent channel interference, thereby affecting the communication quality. In order to obtain high linearity, only adopting the method of backing off the power will cause the efficiency of the power amplifier to decrease. [0003] In order to effectively improve the linearity of the power amplifier and at the same time have high efficiency, the linearization technology of the powe...
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IPC IPC(8): H04L25/49
Inventor 苏慧君杨俊
Owner COMBA TELECOM SYST CHINA LTD