Digital pre-distortion method and device
A digital pre-distortion and digital signal technology, which is applied in the direction of improving the amplifier to reduce nonlinear distortion, etc., can solve the problems of unable to correct the memory effect of the power amplifier and poor pre-distortion effect, so as to improve the nonlinear correction effect and improve the pre-distortion the effect of the effect
Active Publication Date: 2021-07-23
深圳市时代速信科技有限公司
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Problems solved by technology
[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 a digital pre-distortion device. The method comprises the following steps: acquiring a nonlinear function relationship between the current junction temperature of a transistor in a power amplifier and the transistor in time t; coupling an output end signal of the power amplifier to obtain a first output signal and a second output signal, converting the first output signal into a digital signal, and establishing a nonlinear model of the power amplifier according to the digital signal; calculating the current junction temperature of the transistor according to the second output signal of the power amplifier, establishing a nonlinear function of the current thermal power consumption of the power amplifier to the power amplifier within the time t according to the current junction temperature and the nonlinear function relationship, updating the nonlinear model, and then performing pre-distortion processing on the power amplifier. According to the embodiment of the invention, the memory effect of the power amplifier, especially the thermal memory effect of the power amplifier, can be comprehensively corrected, the nonlinear correction effect of the power amplifier can be improved, and the pre-distortion effect can be effectively improved.
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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Login to View More 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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