Control device and method for predistortion and transmitter

Abstract

An embodiment of the invention provides a control device and method for predistortion and a transmitter. The control device comprises an information acquisition unit, a monitoring unit and a control unit, wherein the information acquisition unit processes feedback signals of the predistortion to obtain power or amplitude of predistortion signals and in-band signals or noise signals; the monitoring unit compares the power or amplitude of the predistortion signals with the power or amplitude of the in-band signals or the noise signals and judges whether the processing of the predistortion is abnormal according to comparison results; and the control unit stops processing the predistortion if the judging result is abnormal. According to the control device, whether a predistorter is abnormal can be timely and accurately monitored so that abnormal conditions can be effectively processed.

Description

technical field [0001] The invention relates to the field of wireless communication, in particular to a predistortion control device, method and transmitter. Background technique [0002] With the development of communication technology, various modulation modes with high spectral efficiency are widely used. The modulated signals obtained by using different pulse shaping filters have high frequency efficiency, but the amplitude and phase of these modulated signals vary, and this fluctuation requires the power amplifier (PA, Power Amplifier) ​​in the transmitter to have linear characteristics. [0003] In linearization technology, digital pre-distortion (DPD, Digital Pre-Distortion) is an effective method, the basic principle of which is to make the entire system exhibit linear characteristics through a pre-distortion device that is opposite to the nonlinear characteristics of the power amplifier. . [0004] figure 1 It is a partial structural diagram of a digital predisto...

AI Technical Summary

Problems solved by technology

For example, it may be caused by the non-convex surface of the predistorter. If the performance surface of the predistorter is non-convex, the predistortion coefficients may not converge to the optimum point, which means that there may be A lot of interference coefficients, resulting in a great deterioration of the pre-distortion performance, causing the digital pre-distorter to work abnormally

[0007] In addition, large noise in the predistortion feedback loop may also cause abnormal operation of the digital predistorter

Excessive noise in the feedback loop can cause inaccurate calculation of the cost function, making the pre-distortion coefficient converge to a poor point, resulting in deterioration of pre-distortion performance and causing abnormalities

[0008] In the process of realizing the present invention, the inventor found that there is no effective method for controlling the predistortion in the prior art, and the abnormal situation of the predistorter cannot be detected timely and accurately, so that the abnormal situation cannot be effectively handled

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