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Method, equipment and system for adjusting linear performance of predistortion

A pre-distortion coefficient and pre-distortion technology, applied in the field of digital pre-distortion, can solve the problems of large storage data space requirements, complex calculations, and low operational efficiency, and achieve linear adjustment performance of pre-distortion, simplified complexity, and high stability Effect

Active Publication Date: 2012-10-17
COMBA TELECOM SYST CHINA LTD
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Problems solved by technology

[0011] Embodiments of the present invention provide a method, device, and system for adjusting the linear performance of predistortion, which are used to solve the problem of complex calculation, low operation efficiency, and large storage data space requirements in the prior art for determining predistortion coefficients, resulting in Adjusting the problem of unstable linear performance of pre-distortion

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  • Method, equipment and system for adjusting linear performance of predistortion
  • Method, equipment and system for adjusting linear performance of predistortion
  • Method, equipment and system for adjusting linear performance of predistortion

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Embodiment 1

[0036] Such as figure 2 As shown in FIG. 1 , it is a flow chart of a method for adjusting the linearity performance of predistortion provided by the first embodiment. The method includes:

[0037] Step 101: Construct a linear equation system based on the memory polynomial model according to the input signal z(n) and output signal y(n) of the radio frequency power amplifier, and after converting the linear equation system, obtain R_uu -1 The expression of the predistortion coefficient a, R_uu -1 is the inverse matrix of the predistortion autocorrelation matrix R_uu.

[0038] In this step 101, according to the input signal z(n) and the output signal y(n) of the radio frequency power amplifier, a linear equation system based on the memory polynomial model is constructed, and the matrix transformation is performed on the constructed linear equation system to obtain the predistortion coefficient a The expression of , lays the foundation for accurately determining the predistort...

Embodiment 2

[0043] Such as image 3 As shown in FIG. 2 , it is a flow chart of a method for adjusting the linearity performance of predistortion provided in the second embodiment. This embodiment 2 is a refinement of the method provided in embodiment 1, which includes a detailed description of the implementation of each step in the method provided in the above embodiment 1. The method includes the following steps:

[0044] Step 201: According to the input signal z(n) and the output signal y(n) of the radio frequency power amplifier, construct a linear equation system based on the memory polynomial model.

[0045] In this step 201, when the signal is predistorted, when the bandwidth of the signal received by the radio frequency power amplifier is less than the inherent bandwidth of the radio frequency power amplifier, the memory effect of the radio frequency power amplifier can be ignored; When the bandwidth of the signal is larger than the inherent bandwidth of the RF power amplifier, th...

Embodiment 3

[0129] Such as Figure 4 As shown, it is a schematic structural diagram of a device for adjusting the linear performance of pre-distortion in the third embodiment. The device includes: a pre-distortion coefficient model establishment module 41, an eigenvalue matrix and an eigenvector matrix determination module 42, and a pre-distortion coefficient calculation module 43 and a pre-distortion linear performance adjustment module 44. in,

[0130] The predistortion coefficient model building module 41 is used to construct a linear equation system based on the memory polynomial model according to the input signal z (n) and the output signal y (n) of the radio frequency power amplifier, and after the linear equation system is converted, it is obtained that contains R_uu -1 The expression of the predistortion coefficient a, the R_uu -1 is the inverse matrix of the predistortion autocorrelation matrix R_uu;

[0131] Eigenvalue matrix and eigenvector matrix determination module 42, ...

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Abstract

The invention discloses a method, equipment and a system for adjusting the linear performance of predistortion. The method mainly comprises the steps that a system of linear equations based on a memory polynomial model is constructed according to an input signal z(n) and an output signal y(n) of a radio-frequency power amplifier, and after the system of linear equations is converted, an expression of a predistortion factor a comprising R_uu is obtained; the process of determining the predistortion factor a is converted to a process of determining a characteristic value matrix S and a characteristic vector matrix V of the R_uu, so as to simplify the computational complexity; in the process of determining the characteristic value matrix S and the characteristic vector matrix V, the dimensionality for conducting matrix operations is lower, and storage space needed by the operations is less; and finally, the determined characteristic value matrix S and characteristic vector matrix V of the R_uu are plugged into the expression of the predistortion factor a to obtain the predistortion factor. The predistortion factor a obtained in such a way has higher stability, so the linear adjusting performance of the predistortion is also improved to some extent.

Description

technical field [0001] The invention relates to digital predistortion technology of radio frequency power amplifiers, in particular to a method, device and system for adjusting the linear performance of predistortion. Background technique [0002] In the process of the wireless communication system fully entering 3G and moving towards 4G, the power amplifier is a key component that affects the system performance and coverage in the communication system, and non-linearity is an inherent characteristic of the power amplifier. However, non-linearity will cause filtered The growth of the signal spectrum, which in turn causes interference to adjacent channels, will also cause distortion of in-band signals, and increase the bit error rate of the system. [0003] Therefore, linearizing power amplifiers to improve their power efficiency is crucial for the development of wireless communications. In the prior art, various methods are used to linearly process the power amplifier, for ...

Claims

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Application Information

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IPC IPC(8): H04L25/49
Inventor 邓炳荣杨俊
Owner COMBA TELECOM SYST CHINA LTD
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