Digital pre-distortion method and digital pre-distortion device
A digital pre-distortion and preset algorithm technology, applied in the field of communication, can solve problems such as limited feedback link bandwidth, inability to correct nonlinear distortion of power amplifier output signal, etc.
Active Publication Date: 2014-06-25
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 technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present invention.
[0030] The embodiment of the present invention provides a digital predistortion method, such as figure 1 As shown, the method includes:
[0031] 101. Obtain a feedback signal according to the output signal.
[0032] 102. Obtain a first baseband signal and a first feedback signal according to the baseband signal, the feedback signal, and a preset condition.
[0033] 103. Calculate the intermodulation term coefficient according to the first bas...
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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 present invention relates to the field of communications, 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 technologies have been widely used in modern communication systems. When the peak-to-average ratio modulation signal passes through the power amplifier device, the non-linearity and memory effect of the power amplifier will cause the non-linear distortion of the output signal, which will expand the out-of-band spectrum and cause adjacent channel interference, thus affecting the communication quality. In order to obtain high linearity, only using the power back-off method 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 power amplifier linearization technology has...
Claims
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IPC IPC(8): H04L25/49
Inventor 苏慧君杨俊
Owner COMBA TELECOM SYST CHINA LTD