Digital predistortion process apparatus and updating method of digital predistorter
A digital pre-distortion and pre-distortion processing technology, applied in the direction of synchronization/start-stop system, etc., can solve the problems of increasing system cost, power consumption and difficulty of plate making, difficult to achieve system adaptive change, slow update speed of pre-distorter, etc. , to achieve the effect that the algorithm is easier to converge, easy to implement, and reduce the amount of calculation
A digital pre-distortion and pre-distortion processing technology, applied in the direction of synchronization/start-stop system, etc., can solve the problems of increasing system cost, power consumption and difficulty of plate making, difficult to achieve system adaptive change, slow update speed of pre-distorter, etc. , to achieve the effect that the algorithm is easier to converge, easy to implement, and reduce the amount of calculation
CN101309245AActive Publication Date: 2008-11-19DATANG MOBILE COMM EQUIP CO LTD
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[0047] Different from the prior art using the source signal and the feedback signal to update the predistorter, the present invention constructs a new source calibration sequence outside the source signal, and updates the predistorter by comparing the source calibration sequence and the feedback calibration sequence. Reasonable design of the source calibration sequence will not only speed up the update speed of the predistorter, but also save storage space and reduce the amount of computation.
[0048] As analyzed above, for frequency division multiplexing systems such as WCDMA, signals are sent continuously. If the source calibration sequence used to update the LUT is sent outside the source signal, normal services will be affected. But for time-division communication systems, such as TD-SCDMA (Time Division Synchronous-Code Division Multiple Access), LTE (3G Long Term Evolution) and 4G (Fourth Generation Mobile Communication System), the signals are not sent continuously and ...
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The invention discloses a digital predistortion processing device which includes a pre-distorter, a self-adapting updating module, a control module and a calibration sequence generation model used for generating the source calibration sequence and providing the source calibration sequence for the pre-distorter; the self-adapting updating module is used for acquiring the feedback calibration sequence from the power amplification output; the latest pre-distorter is obtained according to the source calibration sequence and the feedback calibration sequence; the pre-distorter is used for storing the predistortion function, processing the source calibration sequence and the source signal through the predistortion function and sending the processed source calibration sequence and source signal to the power amplifier; meanwhile, the latest predistortion function of the self-adapting updating module can be adopted to update the predistortion function stored in the self-adapting updating module; the control module is used for controlling the pre-distorter, the self-adapting updating module and the calibration sequence generation module for coordination operation. The digital predistortion processing device adopts the newly-constructed calibration sequence to control all the amplitudes from the minimum value to the peak value; namely, the pre-distorter can be updated so that the updating speed is improved and the algorithm difficulty is simplified. The digital predistortion processing device also provides an updating method of the digital pre-distorter.
Description
technical field [0001] The invention relates to digital pre-distortion processing technology, in particular to a digital pre-distortion processing device in a time-division communication system and a method for updating a digital pre-distortion device. Background technique [0002] The power amplifier (Power Amplifier, PA, hereinafter referred to as the power amplifier) ​​is an indispensable part of a communication system. Due to the nonlinear characteristics of the transistor itself, the input and output characteristics of the power amplifier that has not been linearized are nonlinear, especially the input signal The larger part will be more distorted. Non-linearity will generate spectrum regrowth, which will lead to adjacent channel interference, so that the system cannot meet the strict out-of-band radiation requirements; non-linearity will also cause in-band interference, which will reduce the bit error rate performance of the system. [0003] Among all linearization te...
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Patent Timeline
19 Nov 2008
Publication
CN101309245A
- IPC
- H04L25/49
- Inventors
- 田大春; 刘先锋