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A Composite Nonlinear Injection Peak-to-Average Power Ratio Suppression and Digital Predistortion Method

A digital predistortion, peak-to-average power ratio technology, applied in digital transmission systems, modulation carrier systems, synchronization/start-stop systems, etc., can solve the problems of inability to achieve linearity, efficiency, and effective control, and achieve excellent performance The effect of bit error performance

Active Publication Date: 2019-11-08
INST OF ELECTRONICS ENG CHINA ACAD OF ENG PHYSICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The traditional PAPR suppression method and the DPD method do not jointly consider the optimal compromise design of the linearity and efficiency of the wireless transmitter as a whole. That is to say, the traditional method is to first suppress the signal PAPR to a certain extent, and then Perform DPD linearization processing on the power amplifier of the wireless transmitter alone
However, the EVM distortion in the PAPR-suppressed signal obtained by using the distorted PAPR suppression method will limit the EVM performance of the wireless transmitter output signal after DPD linearization, but its ACPR performance often has a large margin to meet the spectrum emission requirements. Template requirements (such as ACPR of -45dBc specified by 3GPP for the downlink LTE link)
Therefore, the traditional distorted PAPR suppression method does not affect the signal ACPR at all, but only affects the signal EVM. It is not the best practice, and it cannot effectively control the linearity and efficiency.

Method used

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  • A Composite Nonlinear Injection Peak-to-Average Power Ratio Suppression and Digital Predistortion Method
  • A Composite Nonlinear Injection Peak-to-Average Power Ratio Suppression and Digital Predistortion Method
  • A Composite Nonlinear Injection Peak-to-Average Power Ratio Suppression and Digital Predistortion Method

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Embodiment 1

[0051] As a preferred embodiment of the present invention, with reference to the attached figure 1 , this example discloses:

[0052] A compound nonlinear injection peak-to-average power ratio suppression and digital predistortion method, comprising the following steps:

[0053] A. PAPR suppression step: define the iteration algebra i, when i=0, initialize the signal u after PAPR suppression i (n)=u 0 (n)=x(n), that is, the PAPR suppression result of the 0th generation is to directly assign the original baseband modulation signal x(n) to the PAPR suppressed signal u of the 0th generation 0 (n);

[0054] a. For the signal u after PAPR suppression obtained after the i-th generation treatment i (n), perform full-bandwidth high-order nonlinear injection processing:

[0055]

[0056] get intermediate signal where a 1 is the coefficient of the nonlinear polynomial, and p is the higher-order nonlinear order;

[0057] b. For intermediate signals Perform in-band high-orde...

Embodiment 2

[0064] As another preferred embodiment of the present invention, this embodiment discloses:

[0065] A compound nonlinear injection peak-to-average power ratio suppression and digital predistortion method, comprising the following steps:

[0066] A. PAPR suppression step: define the iteration algebra i, when i=0, initialize the signal u after PAPR suppression i (n)=u 0 (n)=x(n), that is, the PAPR suppression result of the 0th generation is to directly assign the original baseband modulation signal x(n) to the PAPR suppressed signal u of the 0th generation 0 (n);

[0067] a. For the signal u after PAPR suppression obtained after the i-th generation treatment i (n), perform full-bandwidth high-order nonlinear injection processing:

[0068]

[0069] get intermediate signal where a 1 is the coefficient of the nonlinear polynomial, p is the high-order nonlinear order; the coefficient of the nonlinear polynomial a 1 Should satisfy: -11 <0; the nonlinear order p should sat...

Embodiment 3

[0079] As another preferred embodiment of the present invention, this embodiment discloses:

[0080] A compound nonlinear injection peak-to-average power ratio suppression and digital predistortion method, comprising the following steps:

[0081] A. PAPR suppression step: define the iteration algebra i, when i=0, initialize the signal u after PAPR suppression i (n)=u 0(n)=x(n), that is, the PAPR suppression result of the 0th generation is to directly assign the original baseband modulation signal x(n) to the PAPR suppressed signal u of the 0th generation 0 (n);

[0082] a. For the signal u after PAPR suppression obtained after the i-th generation treatment i (n), perform full-bandwidth high-order nonlinear injection processing:

[0083]

[0084] get intermediate signal where a 1 is the coefficient of the nonlinear polynomial, p is the high-order nonlinear order; the coefficient of the nonlinear polynomial a 1 Should satisfy: -11 <0; the nonlinear order p should sati...

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Abstract

The invention discloses a composite nonlinear injection type peak-to-average power ratio suppression and digital predistortion method, and relates to the technical field of digital signal processing in broadband wireless communication. According to the method disclosed by the invention, compression processing of an original input signal (the formula is as shown in the specification) is realized by using a nonlinear polynomial model, and a full bandwidth / in-band composite high-order nonlinear injection method is provided for realizing PAPR suppression and effectively avoiding the obvious deterioration of an EVM and an ACPR of the signal. By adoption of the composite nonlinear injection type peak-to-average power ratio suppression and digital predistortion method disclosed by the invention, the in-band and out-of-band quality requirements of wireless communication signal transmission can be better satisfied, and the error code performance of a receiving end can be better guaranteed.

Description

technical field [0001] The present invention relates to the technical field of broadband wireless communication digital signal processing, and relates to a baseband signal peak-to-average power ratio suppression and digital pre-distortion method of a broadband wireless communication transmitter, and more specifically, to a compound nonlinear injection peak-to-average power ratio Suppression and digital predistortion methods. Background technique [0002] With the rapid development of mobile wireless communication, non-constant envelope modulation signals (such as QAM) with higher peak-to-average power ratio have been widely used in communication systems. The use of such signals has greatly improved the efficiency of wireless spectrum utilization; however, in During the amplification and transmission process in the wireless transmitter, the peak-to-average power ratio signal with a non-constant envelope will become more sensitive to the nonlinearity of the RF power amplifier ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L27/26H04L25/49
CPCH04L25/49H04L27/2615
Inventor 刘友江
Owner INST OF ELECTRONICS ENG CHINA ACAD OF ENG PHYSICS
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