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System for using complex number QR-recursive least square (RLS) algorithm to complete digital pre-distortion (DPD) function and method thereof

A technology of complex numbers and algorithms, which is applied in the field of linearization processing of nonlinear characteristics of power amplifiers, can solve problems such as difficult hardware implementation, numerical instability, and slow convergence speed, so as to realize pre-distortion function, improve operation speed, and reduce complexity Effect

Inactive Publication Date: 2012-03-28
ZHEJIANG SUNWAVE WIRELESS TECH
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Problems solved by technology

Based on the LS algorithm, the RLS algorithm uses a recursive method to realize the inversion of the matrix, which overcomes the shortcomings of the LS algorithm, which has a large amount of calculation and is not easy to implement in hardware.
The RLS algorithm is not sensitive to the eigenvalue distribution of the signal covariance matrix. In comparison, the LMS algorithm is susceptible to the influence of the eigenvalue distribution range, resulting in a slower convergence speed.
Its disadvantage is that it cannot converge stably, has numerical instability, high computational complexity, and a large amount of calculation.

Method used

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  • System for using complex number QR-recursive least square (RLS) algorithm to complete digital pre-distortion (DPD) function and method thereof
  • System for using complex number QR-recursive least square (RLS) algorithm to complete digital pre-distortion (DPD) function and method thereof
  • System for using complex number QR-recursive least square (RLS) algorithm to complete digital pre-distortion (DPD) function and method thereof

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Embodiment Construction

[0021] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and examples. It should be understood that the examples described here are only used to explain the present invention, and are not intended to limit the present invention.

[0022] figure 2 is the DPD block diagram of the indirect structure, and the predistorter in the figure is a copy of the predistortion trainer.

[0023] The following mainly describes in detail the QR-RLS algorithm completed by the predistortion trainer.

[0024] The memory polynomial expression is as follows:

[0025] F [ x ( n ) ] = Σ k = 1 K Σ q = ...

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Abstract

The invention relates to a system for using a complex number QR-recursive least square (RLS) algorithm to complete a digital pre-distortion (DPD) function and a method thereof. A predistorter is arranged in front of a power amplifier (PA). The predistorter is used to receive a complex number I / Q signal and simultaneously receives a predistortion coefficient which is obtained and processed by a DPD feedback link. A result obtained after completing predistortion processing is taken as input of the PA. A predistortion training device is realized in a soft core of FPGA. The QR-RLS algorithm is used during a predistortion coefficient solution process. Compared to a traditional predistortion technology, by using the QR-RLS algorithm, stability of a numerical value can be raised; complexity of operation can be reduced; an operation speed can be increased; a predistortion function can be realized stably and effectively.

Description

technical field [0001] The invention relates to a method for linearizing the nonlinear characteristics of a power amplifier in the field of wireless communication, and mainly relates to a system and a method for completing a DPD function by using a complex QR-RLS algorithm. Background technique [0002] PA (Power Amplifier, power amplifier) ​​has inherent nonlinearity. From the PA characteristic curve, we know that the efficiency of PA is inversely proportional to its nonlinearity. In pursuit of high efficiency of the power amplifier, its non-linearity is inevitable. Non-linearity can lead to spectrum expansion, which can cause adjacent channel signal interference, and can also cause in-band distortion of the signal. For broadband signals such as CDMA, WCDMA, and OFDM, due to their high PAPR (Peak to Average Power Ratio, peak-to-average power ratio), they are more susceptible to PA nonlinearity, resulting in greater in-band distortion. [0003] Therefore, in order to meet...

Claims

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Application Information

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IPC IPC(8): H04L25/49H03F1/32
Inventor 巍源王利强王文元金淮东
Owner ZHEJIANG SUNWAVE WIRELESS TECH
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