Wideband digital predistortion power amplifier temperature compensation method and system
A technology of digital predistortion and temperature compensation, which is applied in the field of temperature compensation of broadband digital predistortion power amplifiers, can solve problems such as drift, achieve constant stability, improve stability, and improve accuracy
Active Publication Date: 2009-09-02
WUHAN HONGXIN TELECOMM TECH CO LTD
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[0006] The purpose of the present invention is to solve the technical problem of the drift caused by the change of ambient temperature in the wideband digital predistortion power amplifier. The present invention starts from the wideband power amplifier model itself, adopts least squares estimation and orthogonal polynomial fitting method, Establish a temperature model of a wideband power amplifier, and provide a temperature compensation method and system for a wideband digital predistortion power amplifier
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[0022] Such as figure 1Shown is the structural diagram of the wideband digital predistortion power amplifier temperature compensation system of the present invention. The system is used for temperature compensation of wideband digital predistortion power amplifier, including digital predistorter DPD system 101, digital-to-analog converter DAC102, radio frequency transmitter 103 and wideband power amplifier PA104, digital temperature sensor 107, RF feedback loop 105 and Analog-to-digital converter ADC106. The digital predistorter DPD system 101 is used to perform temperature compensation pre-distortion processing on the baseband IQ data; the digital-to-analog converter DAC102 performs digital-to-analog conversion on the pre-distortion signal after the digital pre-distortion temperature compensation processing and outputs a zero-IF baseband signal The radio frequency transmitter 103 will carry out the analog quadrature modulation to the radio frequency band to the zero intermed...
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The invention provides a wideband digital predistortion power amplifier temperature compensation method and system based on environmental temperature detection and building up a wideband power amplifier temperature compensation model. Base on the wideband power amplifier model, the method includes the steps of designedly changing the working environmental temperature of a wideband power amplifier, adopting a least-squares estimation and orthogonal polynomial fitting method to identify the temperature model of the wideband power amplifier, then adopting an indirect learning structure to build up the temperature model of a digital predistorter, finally detecting the environmental temperature in real time through a digital temperature sensor, calculating the corresponding temperature value and calculating the coefficient value of the temperature model of the digital predistorter in real time according to the temperature value, thereby the real-time temperature compensation of the wideband digital predistortion power amplifier is realized. The wideband digital predistortion power amplifier temperature compensation method based on environmental temperature detection and building up a wideband power amplifier temperature compensation model can compensate the wideband digital predistortion power amplifier temperature drift in real time.
Description
technical field [0001] The invention relates to the technical field of digital predistortion power amplifiers, in particular to a temperature compensation method and system for wideband digital predistortion power amplifiers. Background technique [0002] In order to meet the trend of miniaturization and environmental protection of base station equipment in the next generation mobile communication system (4th generation mobile communication, namely 4G), it is necessary to improve the linearity and efficiency of the broadband power amplifier. However, for the Orthogonal Frequency Division Multiplexing (OFDM) technology adopted in the next generation mobile communication system has a relatively high peak-to-average power ratio (Peak-to-Average Power Ratio, namely PAPR) problem, How to improve the linearity of the power amplifier, many power amplifier linearization technologies have been proposed, among which the pre-distortion technology includes three methods: radio frequency...
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IPC IPC(8): G05D23/19G05B17/02H03F1/34H04L25/49
Inventor 王建新陈朝阳余建国
Owner WUHAN HONGXIN TELECOMM TECH CO LTD