Adaptive pre-distortion method

A pre-distortion and self-adaptive technology, applied in the direction of improving amplifiers to reduce nonlinear distortion, digital transmission systems, electrical components, etc., can solve the problems of increased difficulty in realization, unstable pre-distortion model, non-convergence, etc., and achieve easy implementation, Save implementation costs and achieve simple effects

Active Publication Date: 2009-06-17
ZTE CORP
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Problems solved by technology

The inversion process of this technical solution is prone to irreversible PA model parameters, resulting in instability of the predistortion model, or even non-convergence
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Embodiment Construction

[0042] The technical solution of the present invention is applicable to the linearization of power amplifiers in wireless communication systems. The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0043] Such as Figure 4 Shown is the basic structure diagram of the adaptive predistortion used in the linearized power amplifier in the present invention. and figure 2 Compared with the prior art shown, through proper clock selection, frequency planning and digital frequency shifting, one RF local oscillator can meet the frequency requirements of the system's RF frequency output, transmission and feedback signals, thus saving one RF local oscillator. vibration. The program also avoids figure 2 The phase error caused by the inconsistency of the phase noise characteristics between the two RF LOs. Figure 4 The digital predistorter 410 includes an amplitude calculation and address generation module 4...

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Abstract

The invention discloses a self-adaptive predistortion method, which comprises the steps: collecting emission data and feedback data, calculating loop delay according to the emission data and the feedback data, carrying out time unifying to input signals according to the loop delay, compensating collected delay of the emission data and the feedback data according to the loop delay, estimating a predistortion model parameter, constructing a matrix according to the set predistortion model parameter, calculating a predistortion parameter corresponding to a power amplifier, adopting a curve fitting method to sample and quantize the predistortion parameter to obtain an LUT table, modifying the predistortion parameter in a digital predistorter according to the LUT table, carrying out digital predistortion to the input signals according to an LUT address and the predistortion parameter which is modified, and generating the LUT address according to the amplitude of the input signals. The technical scheme of the invention saves the hardware implementation cost and can be realized in an FPGA (programmable gate array) easily.

Description

technical field [0001] The invention relates to a technique for correcting the nonlinearity and memory effect of a radio frequency power amplifier, in particular to an adaptive predistortion method. Background technique [0002] At present, CDMA (such as WCDMA, cdma2000 and TS-SCDMA), OFDM (such as WiMax and LTE) and other systems have adopted high-order modulation technologies such as QPSK, 16QAM and even 64QAM with high spectrum utilization in order to improve spectrum efficiency. Using a non-constant envelope modulated signal will result in a larger peak-to-average ratio. In order to increase the capacity of the communication system and reduce the cost, multi-carrier power amplifiers are gradually adopted by operators, and the application of multi-carrier technology further increases the peak-to-average ratio of input signals of power amplifiers. [0003] The input signal with a larger peak-to-average ratio puts forward higher linearity requirements for the power amplifi...

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Application Information

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IPC IPC(8): H04L25/49H04L7/02H04B1/62H03F1/32
Inventor 游爱民
Owner ZTE CORP
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