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Improved self-adaption predistortion technology

A pre-distortion and digital pre-distortion technology, which is applied to the shaping network, synchronization/start-stop system, baseband system components in the transmitter/receiver, etc., can solve the problems affecting the performance of adaptive baseband predistortion, etc. The effect of work performance

Inactive Publication Date: 2011-08-03
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology

The noise and linear distortion signal introduced by the feedback branch cannot be eliminated in the adaptive predistortion, and the system regards these and the feedback signal together as the output signal of the power amplifier, so in this case the input of the power amplifier obtained The output model and its inverse model are not real and credible, which ultimately affects the performance of adaptive baseband predistortion

Method used

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  • Improved self-adaption predistortion technology

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Embodiment Construction

[0027] Hereinafter, the present invention will be described in detail with reference to the accompanying drawings of embodiments of the present invention.

[0028] refer to figure 1 , is a structural block diagram of the adaptive digital predistortion provided by the embodiment of the present invention. The adaptive digital pre-distortion according to the embodiment of the present invention includes:

[0029] The digital pre-distortion unit 10 performs signal processing on the two baseband input signals respectively, so that the input signals are nonlinearly distorted to compensate the nonlinear characteristics of the power amplifier.

[0030] refer to figure 2 , in this embodiment, the baseband input signal x(n)=x i (n)+j*x q (n) produce as x respectively through input signal processor 11 i (n)+j*x q (n), x i (n)|x i (n)| 2 +j*x q (n)|x q (n)| 2 and x i (n)|x i (n)| 2k +j*x q (n)|x q (n)| 2k and other signals, and then send these signals to K FIR (Finite Im...

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Abstract

The invention provides an improved predistortion method and device. The linearized device comprises a self-adaption digital predistortion module and a signal balance module, wherein the self-adaption digital predistortion module completes predistortion processing of a power amplification input signal and carries out self-adaption control according to the change of power amplification characteristics; and the signal balance module is used for compensating the distortion aiming at the linear distortion in a forward branch and a feedback branch in a self-adaption predistortion circuit so that a predistortion signal and a feedback signal are not interfered by circuit irrational factors and self-adaption predistortion performance is improved.

Description

technical field [0001] The technology relates to the technical field of broadband wireless communication, in particular to a broadband adaptive digital pre-distortion device. By equalizing the feedback signal and the pre-distortion signal, the influence of the linear distortion generated by the broadband adaptive digital pre-distortion device on the performance of the pre-distortion is eliminated. Background technique [0002] With the development of modern wireless communication technology, in order to improve spectrum utilization and modulation efficiency, the modulation method of radio frequency communication signal is gradually complicated, and the envelope amplitude of modulated signal has obvious random characteristics (that is, it has a high peak-to-average ratio). This requires the transmitter to have a large enough dynamic range to adapt to its envelope change, and also puts forward high requirements on the linearity of the transmitter. In addition, in a traditiona...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L25/49H04L25/03
Inventor 何松柏胡哲彬马岳林游飞
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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