A method for realizing a wideband digital predistorter

A technology of digital predistortion and implementation method, which is applied in the realization of wideband digital predistorter and the field of wideband power amplifier linearization, and can solve the problem that FPGA cannot realize digital predistorter, high-speed multiplier and adder, and model input and output Problems such as timing design difficulties, to achieve the effect of reducing system processing rate, low complexity, and wide linear bandwidth

Inactive Publication Date: 2018-12-18
INST OF ELECTRONICS ENG CHINA ACAD OF ENG PHYSICS
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0005] (1) The highest processing clock of logic devices such as FPGAs generally does not exceed 500MHz, and FPGAs cannot implement digital predistorters with bandwidths above 100MHz
[0006] (2) The high-speed multiplier and adder in the MP model cannot be realized
[0007] (3) As the order and memory depth of the MP model increase, the timing design between the input and output of the model is very difficult

Method used

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  • A method for realizing a wideband digital predistorter
  • A method for realizing a wideband digital predistorter
  • A method for realizing a wideband digital predistorter

Examples

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Embodiment 1

[0045] As a preferred embodiment of the present invention, with reference to the attached Figure 1-5 , this example discloses:

[0046] A method for realizing a wideband digital predistorter, comprising the steps of:

[0047] Step A, obtaining the feedback signal y(n) of the power amplifier, expressed as:

[0048]

[0049] Where y(n) is the output of the model, x(n) is the input of the model, a km is the coefficient of the model, K and M are the nonlinear order and memory depth of the model respectively;

[0050] Step B, observe whether there is spectrum expansion in y(n), and judge whether it is linear, if the spectrum of y(n) does not expand, then the linear effect converges, and directly enter step G; if the spectrum of y(n) expands, Then nonlinear distortion occurs, the linear effect does not converge, and enters step C;

[0051]Step C, decomposing the memory polynomial model in step A into M paths, then the memory polynomial model is expressed as:

[0052]

[...

Embodiment 2

[0068] As another preferred embodiment of the present invention, with reference to the attached Figure 1-5 , this example discloses:

[0069] A method for realizing a wideband digital predistorter, comprising the following steps:

[0070] Step A, obtain the feedback signal y(n) of the power amplifier by the ADC acquisition card, express as:

[0071]

[0072] Where y(n) is the output of the model, x(n) is the input of the model, a km is the coefficient of the model, K and M are the nonlinear order and memory depth of the model respectively;

[0073] Step B. Observe whether y(n) has spectrum expansion through the spectrum analyzer to judge whether it is linear. If the spectrum of y(n) does not expand, it means that the linear effect is converged, and then directly enter step G; if y(n) ) has expanded, indicating that nonlinear distortion has occurred, and the linear effect has not converged, and enters step C;

[0074] Step C, decomposing the memory polynomial model in s...

Embodiment 3

[0097] Such as Figure 6 as shown, Figure 6 It is the linearization result diagram of the actual measurement of the power amplifier in the implementation case of the proposal of this application. This implementation case predistorts 64QAM with a symbol rate of 100Msps and a bandwidth of 125MHz. The traditional predistorter requires a working frequency of 750MHz, which cannot be implemented in FPGA. However, this implementation case decomposes the predistorter model into 8 channels. DPD core parallel computing, the required baseband clock can be reduced to 750 / 8 = 93.75MHz, which greatly reduces the operating frequency of FPGA. From Figure 6 It can be seen that the broadband digital predistorter in this implementation case has good linearization capability.

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Abstract

The invention discloses a method for realizing a wideband digital predistorter, which relates to the technical field of wireless communication. By decomposing the memory effect in the predistorter model, the method decomposes the predistorter model into parallel computations of a plurality of non-memory polynomials, reduces the operation speed of the predistorter model, and thus realizes the wideband digital predistorter at a low working frequency.

Description

technical field [0001] The invention relates to the technical field of wireless communication, in particular to a linearization method of a broadband power amplifier in a wireless communication system transmitter, and more specifically to a method for realizing a broadband digital predistorter. Background technique [0002] In a wireless communication system, the RF power amplifier in the transmitter is one of the essential devices. Since the inherent memory nonlinearity of the RF terminal power amplifier is one of the key factors affecting the efficiency and signal quality of the transmitter, in order to meet the requirements of the transmitter In order to meet the high efficiency and signal transmission quality requirements, it is necessary to take necessary linearization processing for the RF terminal power amplifier. Digital Predistortion technology (Digital Predistortion, DPD) is to predistort the signal at the baseband, which can compensate the memory non-linear charac...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L25/49
CPCH04L25/49
Inventor 张祺刘友江杨大龙
Owner INST OF ELECTRONICS ENG CHINA ACAD OF ENG PHYSICS
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