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Single-bit DPD (Digital Pre-Distortion) method for power amplifier

A technology of digital predistortion and power amplifier, which is applied in the direction of improving amplifiers to reduce nonlinear distortion, parts of amplifiers and amplifiers, etc. It can solve problems such as inability to cope with memory effects, slow convergence speed, etc., and achieve convenient linearization and solution The effect of similar speed, power consumption and cost reduction

Active Publication Date: 2016-09-21
UNIV OF SCI & TECH OF CHINA
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Problems solved by technology

Corresponding to it is a scalar predistortion (scalar DPD) method [16], which only needs to collect the out-of-band information of the signal and minimize it to extract the DPD parameters. The disadvantage is that the convergence speed is slow and it cannot cope with memory effect
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[0075] The scheme principle of the 1bit digital predistortion method proposed by the present invention is as follows: Figure 5 As shown, the process is: (1) take the difference between the input and output signals; (2) replace the conventional feedback branch ADC with a 1-bit ADC or comparator, and sample the difference between the input and output signals accordingly. That is, x is still the input signal sequence, and the output y signal is subjected to difference processing. After such processing, a new iterative format suitable for 1 bit is used to iterate to complete the whole process of DPD.

[0076] Therefore, the gist of the method of the present invention is also embodied in that a new iterative equation is theoretically provided to replace the traditional DPD iterative equation. The time-delay alignment algorithm and step-size selection strategy are necessary steps to complete the iteration, which fully embodies the characteristics of 1-bit processing conditions. T...

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Abstract

The invention relates to a single-bit DPD (Digital Pre-Distortion) method for a power amplifier. The single-bit DPD method comprises the steps of: carrying out time delay estimation by a frequency domain method, and carrying out time delay compensation in a digital domain; taking difference values of input and output signals; replacing a conventional feedback branch circuit ADC (Analog-to-Digital Converter) with a 1bit ADC or a comparator, sequentially carrying out sampling on the difference values of the input and output signals, i.e., x still represents an input signal sequence, and carrying out difference value taking processing on output y signals; estimating a step length required in iteration; and carrying out iteration by employing an iteration format suitable for 1bit after carrying out the processing to complete parameter extraction of DPD. According to the method, a 1bit technology developed in the field of digital signal processing in recent years is used for a DPD technology of the power amplifier, the single-bit DPD method is formed, power consumption and cost of a feedback loop can be greatly reduced, a bandwidth range of the DPD technical application also can be greatly improved and is expected to reach hundreds of MHz, and the broadband DPD technical requirements of 5G (5th-generation) communication are possibly solved.

Description

technical field [0001] The invention relates to a single-bit digital predistortion method of a power amplifier, which belongs to the technical field of electronic information and communication. Background technique [0002] In a wireless communication system, a power amplifier (Power Amplifier, PA) is a main nonlinear device. Severe nonlinearity near the saturation point of the power amplifier will cause in-band distortion of the signal, and at the same time, spectrum leakage will occur, resulting in adjacent channel interference. On the contrary, making the peak-to-average ratio signal work in the linear region will reduce power efficiency. Therefore, the linearization technology of the power amplifier has become a research hotspot in recent years. Among them, digital predistortion (Digital PreDistortion, DPD) has become a widely used technology due to its advantages of low cost and flexible programming [1,2]. DPD technology is to cascade a predistorter (PreDistorter, PD)...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03F1/32H03F3/213
CPCH03F1/3247H03F3/213
Inventor 王昊禹刘发林周崇彬李刚李博陶伟
Owner UNIV OF SCI & TECH OF CHINA
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