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A Method for Improving the Predistortion Performance of Radio Frequency Power Amplifier

A technology of radio frequency power and pre-distortion, which is applied to power amplifiers, improved amplifiers to reduce nonlinear distortion, high-frequency amplifiers, etc., can solve problems such as numerical instability, slow convergence speed, and inability to converge to the optimal value. Numerical instability, low cost and simple structure

Inactive Publication Date: 2015-10-28
BEIJING RED SEA TECH
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Problems solved by technology

In the implementation of the predistortion linearization model parameter estimation algorithm, the matrix Φ H Φ inversion may bring numerical instability, which greatly affects the effect of parameter estimation and linearization
In addition, in the process of solving the least mean squares algorithm, although it is not necessary to H Φ inverse, but because the columns of the matrix Φ are highly correlated, there will be slow convergence speed or failure to converge to the optimal value during the parameter estimation process of the predistortion linearization model

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  • A Method for Improving the Predistortion Performance of Radio Frequency Power Amplifier
  • A Method for Improving the Predistortion Performance of Radio Frequency Power Amplifier
  • A Method for Improving the Predistortion Performance of Radio Frequency Power Amplifier

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Embodiment Construction

[0040] After obtaining the input signal and output signal of the RF power amplifier, a specific predistortion linearization model can be used to simplify the complexity of the digital predistortion compensation module. The predistortion linearization model includes a polynomial model, an artificial neural network model, and the like.

[0041] The most widely used predistortion linearization model is the polynomial model, and its mathematical expression is as follows:

[0042] y ( n ) = Σ k = 0 K a 2 k + 1 | x ( n ) | 2 k x ( ...

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Abstract

The invention provides a method for improving predistortion performance of a radio-frequency power amplifier, which utilizes an orthogonal polynomial to replace an original polynomial model or an original Volterra series model to solve the problem of an unstable value when parameters are estimated. Besides, a generation mode of the orthogonal polynomial is given, and corresponding model parameter estimation algorithm is provided. Compared with the prior art, the method solves the problem of the unstable value when a predistortion linearization model of the radio-frequency power amplifier estimates the parameters, and the method has the advantages of being simple in structure, low in fixed-point achieving cost and the like.

Description

technical field [0001] The present invention relates to a method for improving the predistortion performance of a radio frequency power amplifier, in particular to a method for solving the numerical instability during predistortion parameter estimation by using orthogonal polynomials and ensuring the linearization of the predistortion of the radio frequency power amplifier, which belongs to wireless communication technology field. Background technique [0002] In a wireless communication system, the energy consumption of the wireless communication base station and its supporting equipment accounts for about 80% of the total energy consumption. Among them, the radio frequency power amplifier (RFPA) is one of the most important energy-consuming devices. Improving the power efficiency of RF power amplifiers is of great significance to the energy saving and environmental protection of wireless communication base stations. [0003] For traditional RF power amplifiers, their lin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03F1/32H03F3/189H03F3/20
Inventor 钱骅黄剑毅向卫东沈漫源冯卫锋关心
Owner BEIJING RED SEA TECH
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