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Digital predistortion method of jointly compensating for IQ imbalance and PA non-linearity

A technology of digital predistortion and joint compensation, which is used in improving amplifiers to reduce nonlinear distortion, digital transmission systems, components of amplification devices, etc.

Inactive Publication Date: 2016-04-06
NAT UNIV OF DEFENSE TECH
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  • Summary
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Problems solved by technology

[0005] The technical problem to be solved by the present invention is to overcome the interference of nonlinearity from I / Q imbalance to digital predistortion, and provide a digital predistortion method that jointly compensates I / Q imbalance and PA nonlinearity

Method used

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Embodiment Construction

[0059] The present invention will be described in detail below in conjunction with the accompanying drawings.

[0060] figure 1 It is the basic block diagram of the digital predistortion at the radio frequency end. As shown in the figure, the identification of the parameters of the DPD is performed by comparing the forward signal and the feedback signal. Due to the I / Q imbalance caused by the up-down conversion, additional distortion will appear in the feedback signal. If the influence of I / Q imbalance is not considered, and only digital predistortion is used to compensate for PA nonlinearity, then the accuracy of parameter identification of the digital predistortion module will be affected, which will significantly reduce the nonlinear compensation performance of the entire system. However, if the traditional hierarchical processing strategy is adopted, such as figure 2 As shown, first perform a large power backoff on the PA, use the I / Q imbalance compensation module to c...

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Abstract

The invention relates to a digital predistortion method of jointly compensating for IQ imbalance and PA non-linearity. Comprehensively considering the requirement of jointly compensating for IQ imbalance and PA non-linearity, based on a GMP (Generalized Memory Polynomial)-based traditional digital predistortion model, the method further considers I / Q imbalance influence, and simultaneously completes I / Q imbalance non-linearity and power amplification non-linearity compensation, thereby eliminating main non-linearity in a transmitter.

Description

technical field [0001] Aiming at the nonlinear distortion problem of the power amplifier under the condition of IQ imbalance, the invention provides a digital predistortion method for joint compensation of IQ imbalance and PA nonlinearity. Background technique [0002] With the rapid development of mobile communication technology, in order to carry higher data traffic on limited spectrum resources, modern wireless communication uses more methods such as Quadrature Amplitude Modulation (QAM, Quadrature Amplitude Modulation) or Orthogonal Frequency Division Multiplexing (OFDM, Orthogonal Frequency Division Multiplexing) and other non-constant envelope modulation techniques. However, the signals generated by these technologies have a high peak-to-average ratio (PAPR, PeaktoAveragePowerRatio), requiring the power amplifier at the radio frequency end to have a wide linear amplification range, otherwise it is easy to cause nonlinear distortion problems due to the inherent nonlinea...

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Application Information

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IPC IPC(8): H04L25/49H04L27/36H03F1/32H03F3/189H03F3/20
CPCH04L25/49H03F1/3247H03F3/189H03F3/20H04L27/364H04L27/367
Inventor 辜方林王杉魏急波谭超强赵海涛王非一韩伟刘潇然
Owner NAT UNIV OF DEFENSE TECH
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