Predistorter control method and predistorter control device
A technology of predistorter and control method, which is applied in the direction of improving amplifiers to reduce nonlinear distortion, synchronization/start-stop system, etc., and can solve problems such as inability to achieve rapid update of predistortion coefficients, long convergence time, etc.
Inactive Publication Date: 2017-10-17
FUJITSU LTD
View PDF3 Cites 0 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
When the signal power changes rapidly, the amplifier exhibits different nonlinear characteristics, and the predistorter is required to be able to quickly track the characteristic changes of the amplifier; however, due to the need to accurately calculate the power of the out-of-band distorted signal, the average of multiple sample points is often required The instantaneous random fluctuation of the signal is removed, which makes the convergence time longer and cannot realize the rapid update of the predistortion coefficient
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment Construction
[0046] In order to understand the above-mentioned purpose, features and advantages of the present invention more clearly, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that, in the case of no conflict, the embodiments of the present application and the features in the embodiments can be combined with each other.
[0047] In the following description, many specific details are set forth in order to fully understand the present invention, but the present invention can also be implemented in other ways different from those described here, therefore, the present invention is not limited to the specific embodiments disclosed below limit.
[0048] figure 1 A schematic block diagram of a method for controlling a predistorter according to an embodiment of the present invention is shown.
[0049] Such as figure 1 As shown, the predistorter control method according to the embo...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
Login to View More Abstract
The present invention provides a method for controlling a predistorter, which is used for performing predistortion processing on a data source signal input to a nonlinear device through a predistorter, including: determining an update time period, the length of which is greater than the calculation cost function The calculation time length is less than the convergence time length of the update algorithm of the unit that performs the self-adaptive update operation of the pre-distortion coefficient; the state parameter of the output signal of the nonlinear device is obtained, if the change of the state parameter within the update time period is less than or equal to the predetermined If the variation threshold is set, the pre-distortion coefficient calculated by the unit performing adaptive update operation of the pre-distortion coefficient during the update period is provided to the pre-distorter. The invention also provides a predistorter control device. Through the technical solution of the invention, the updating of the predistortion coefficients can be completed in a short time without waiting for the convergence of the updating algorithm, thereby increasing the possibility of updating the coefficients, thereby effectively improving the performance of the power amplifier.
Description
technical field [0001] The present invention relates to a power amplifier, in particular to a predistorter control method and a predistorter control device for adaptive digital predistortion control of the power amplifier. Background technique [0002] With the development of communication technology, especially the rapid development of broadband communication technology, various modulation methods with high spectral efficiency are widely used. The problem of Peak-to-Average Power Ratio (PAPR) also puts forward higher requirements on the linearization technology of the power amplifier (PA, Power Amplifier). [0003] Among the linearization technologies of power amplifiers, digital pre-distortion technology (DPD, Digital Pre-distortion) is a widely used and effective method. The predistorter with opposite nonlinear characteristics performs predistortion processing on the transmitted signal, so as to improve the nonlinear characteristics of the entire transmitter system, so t...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More Patent Type & Authority Patents(China)
IPC IPC(8): H04L25/49H03F1/32
Inventor 周建民陈培久保徳郎
Owner FUJITSU LTD