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.
CN105471784AInactive Publication Date: 2016-04-06NAT UNIV OF DEFENSE TECH
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
NAT UNIV OF DEFENSE TECH
Publication Date
2016-04-06
Estimated Expiration
Not applicable · inactive patent

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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.
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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...

Claims

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