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A Fine Digital Predistortion Optimal Linearization Method for Nonlinear Power Amplifier

A digital predistortion and linearization technology, applied in improving amplifiers to reduce nonlinear distortion, components of amplifying devices, amplifiers, etc., can solve problems such as carrier influence, poor performance, and difficulty in significantly suppressing noise.

Active Publication Date: 2021-10-01
PEKING UNIV
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Problems solved by technology

[0004] However, the performance of the existing conventional DPD technology is poor under the condition of higher frequency carrier, it is difficult to significantly suppress the noise, and it also has an impact on the carrier
Both carrier and nonlinear distortion suffer significant degradation to meet previous performance requirements
For the communication system, the performance will not improve, but will decrease

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  • A Fine Digital Predistortion Optimal Linearization Method for Nonlinear Power Amplifier
  • A Fine Digital Predistortion Optimal Linearization Method for Nonlinear Power Amplifier
  • A Fine Digital Predistortion Optimal Linearization Method for Nonlinear Power Amplifier

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Embodiment Construction

[0052] Below in conjunction with accompanying drawing, further describe the present invention through embodiment, but do not limit the scope of the present invention in any way.

[0053] The invention provides an optimal linearization method of fine digital pre-distortion, and proposes an optimal linearization process of digital pre-distortion for nonlinear power amplifiers. Through the microscopic analysis of the useful signal output by the power amplifier and the nonlinear distortion, a practical analytical expression method for the relationship between the useful signal output by the power amplifier, the nonlinear distortion of the power amplifier and the parameters of the power amplifier is established; the theory of the predistortion-power amplifier complex is proposed The mapping construction method of all possible output spectrums; reveals that there is a theoretical upper limit of the linearization effect of digital predistortion of the power amplifier; proposes an impl...

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Abstract

The invention discloses a fine digital predistortion optimal linearization method of a nonlinear power amplifier. Through the microscopic analysis of the output useful signal and nonlinear distortion of the power amplifier, a practical analytical expression method for the relationship between the output useful signal of the power amplifier, the output nonlinear distortion of the power amplifier and the parameters of the power amplifier is established; the predistortion-power amplifier is proposed The mapping construction method of all possible output spectrums of the complex (DPD‑PA complex) in theory; the solution method of the fine digital predistortion optimal linearization method under the constraint conditions is proposed. Compared with the existing digital pre-distortion scheme proposed by adopting the macroscopic overall analysis method, the present invention verifies that there is an optimal theoretical upper limit for the linearization performance of the digital pre-distortion of the multi-carrier system through analytical calculation or numerical calculation. At the same time, this optimal linearization theoretical upper bound is achieved in embodiments of the method.

Description

technical field [0001] The invention belongs to the technical field of wireless communication, relates to nonlinear power amplifier system optimization and digital pre-distortion technology, in particular to a fine digital pre-distortion optimal linearization method of nonlinear power amplifier. Background technique [0002] In the modern communication market, there is an increasing demand for high data rate communication, accompanied by an exponential increase in the number of wireless end users. At present, the main solution to this requirement is to increase the carrier frequency of the communication system and widen the channel bandwidth. These trends have led to the development and widespread use of spectrally efficient, complex modulation protocols for use with signals of high peak-to-average power ratio and wide signal bandwidth. In the 4G scenario, one of the main communication noises comes from the nonlinear distortion caused by the RF power amplifier, and this pro...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03F1/32
CPCH03F1/3205H03F1/3241
Inventor 雷易鸣
Owner PEKING UNIV