dpd implementation method and system

Abstract

The invention discloses a DPD achieving method and system. The method includes the steps that a power amplification input signal and a power amplification output signal are grabbed; according to a predistortion polynomial, the grabbed power amplification signal and the power amplification output signal are converted into an autocorrelation matrix and a cross-correlation matrix through an FPGA, wherein the cross-correlation matrix is a product of the autocorrelation matrix and a predistortion factor; according to the autocorrelation matrix and the cross-correlation matrix, the predistortion factor is solved and sent to the FPGA; according to the predistortion factor, the FPGA performs predistortion processing on the input signal. According to the implementation of the method and system, through using the FPGA, the DPD factor can be updated rapidly after power changes, so that long-time intermodulation deterioration caused by power and frequency point changes is prevented, and communication quality and power amplification efficiency are greatly improved.

Description

technical field [0001] The present invention relates to the technical field of communication, in particular to a DPD realization method and system. Background technique [0002] In communication technology, digital predistortion (DPD) has gradually become the mainstream of communication system linearization technology due to its advantages of low cost, convenient production and high power amplifier efficiency. In actual communication, operators will adjust the number of carriers and carrier frequency points according to the traffic volume or interference. When the number of carriers changes, the power will change. The predistortion coefficient before the power change is not suitable for the DPD cancellation after the power change. , will cause the DPD cancellation to deteriorate. [0003] However, power and frequency point changes often occur in actual communication, and the existing DPD technology update coefficients are slow and cannot keep up with the speed of power chan...

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Problems solved by technology

[0004] Based on this, it is necessary to provide a DPD implementation method and system for the problem that the existing DPD technology update coefficients are slow, which will cause DPD to be in a state of no cancellation and affect communication quality.

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