A digital predistortion method and device
A digital pre-distortion and digital signal technology, applied in the direction of improving amplifiers to reduce nonlinear distortion, etc., can solve the problems of inability to correct the memory effect of power amplifiers, poor pre-distortion effect, etc., so as to improve the nonlinear correction effect and improve pre-distortion. the effect of
Active Publication Date: 2021-12-28
深圳市时代速信科技有限公司
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[0003] The present invention provides a digital pre-distortion method and device to solve the problem that the existing pre-distortion method can only correct the electrical memory of the power amplifier, but cannot comprehensively correct the memory effect of the power amplifier, resulting in poor pre-distortion effect technical issues
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[0067] As a specific implementation of the present invention, the embodiment of the present invention also includes a test module, which is specifically used for:
[0068] Obtain the thermal resistance of the transistor through the thermal resistance test method, and obtain the change function of the junction temperature of the transistor with the temperature change through the electrical method;
[0069] Using high and low temperature probe station and pulse (Pulse) test system to test the transfer and output characteristics of the transistor at different junction temperatures, and establish the functional relationship between the nonlinearity of the transistor and the junction temperature according to the transfer and output characteristics.
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The invention discloses a digital pre-distortion method and device. The method comprises: obtaining the current junction temperature of the transistor in the power amplifier and the nonlinear function relationship of the transistor within time t; coupling the output terminal signal of the power amplifier out of the first output signal and the second output signal, convert the first output signal into a digital signal, and establish a nonlinear model of the power amplifier according to the digital signal; calculate the current junction temperature of the transistor according to the second output signal of the power amplifier, and calculate the current junction temperature according to the current junction temperature and The nonlinear function relationship is to establish the nonlinear function of the current thermal power consumption of the power amplifier to the power amplifier within time t, update the nonlinear model and then perform pre-distortion processing on the power amplifier. The embodiment of the present invention can comprehensively correct the memory effect of the power amplifier, especially the thermal memory effect of the power amplifier, which is beneficial to improving the nonlinear correction effect of the power amplifier, and further can effectively improve the effect of predistortion.
Description
technical field [0001] The invention relates to the technical field of semiconductor devices and wireless communication, in particular to a digital predistortion method and device. Background technique [0002] There are nonlinear problems in the work of power amplifiers under high power, such as power amplifiers produce harmonics, focus, adjacent channel leakage ratio (ACLR) and other nonlinearities, which lead to poor communication quality and affect the call effect. In order to improve the effect of the call, it is necessary to perform pre-distortion processing on the power amplifier used in wireless communication, especially the power amplifier of the wireless base station to avoid the non-linear problem existing in the power amplifier. The existing predistortion method is usually to compensate the signal opposite to the nonlinearity of the power amplifier at the front end of the power amplifier. After pre-compensation, the input signal carries the signal opposite to the...
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IPC IPC(8): H03F1/32
CPCH03F1/32
Inventor 杨天应刘石头张胜峰
Owner 深圳市时代速信科技有限公司
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