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A Digital Predistortion Processing Method Adapting to Rapidly Changing Signals

A technology of digital pre-distortion and processing method, which is applied in the direction of improving amplifiers to reduce nonlinear distortion, synchronization/start-stop system, etc. It can solve the problems that digital pre-distortion methods cannot adapt to communication signals, etc., so as to improve spectrum utilization and system capacity , avoid nonlinearity, and reduce the effect of out-of-band leakage

Active Publication Date: 2015-07-29
SOUTH CHINA UNIV OF TECH
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Problems solved by technology

[0005] In order to overcome the above-mentioned shortcomings and deficiencies of the prior art, the object of the present invention is to provide a digital pre-distortion processing method adaptable to fast-changing signals, which solves the problem that traditional digital pre-distortion methods cannot adapt to fast-changing modern communication signals

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  • A Digital Predistortion Processing Method Adapting to Rapidly Changing Signals
  • A Digital Predistortion Processing Method Adapting to Rapidly Changing Signals

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Embodiment

[0018] figure 1 It is an overall hardware block diagram for implementing digital pre-distortion processing in this embodiment, including a serial processing device, a parallel processing device, a transmitting chain, a feedback chain, a power amplifier and an antenna.

[0019] Such as figure 2 As shown, the digital pre-distortion processing method adapted to fast-changing signals in this embodiment includes the following steps:

[0020] (1) Before the system works normally, the parallel processing device internally stores a training signal x 0 (t), x 0 The bandwidth of (t) is determined by the maximum bandwidth that the power amplifier output signal needs to pay attention to;

[0021] (2) When the system starts, the parallel processing device sends the training signal x through the transmission link 0 (t) to the power amplifier, and at the same time collect the power amplifier output signal y through the feedback link 0 (t), then x 0 (t) and y 0 (t) are sent to the ser...

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Abstract

The invention discloses a digital pre-distortion processing method adaptive to a quick-change signal. The digital pre-distortion processing method comprises the following steps of: storing one group of training signals in a concurrent processor, when a system is started, sending the training signals to a power amplifier by the concurrent processor, acquiring an input signal and an output signal of the power amplifier to be provided to a serial processor, calculating a filter coefficient of eliminating a memory effect, after the serial processor eliminates time delay, calculating a passband ripple of the system, calculating a coefficient of reversely correcting the filter, providing the coefficient to the concurrent processor for correcting the memory effect; after the system is started, continuously acquiring the input signal and the output signal of the power amplifier by the concurrent processor, updating and correcting a memoryless and nonlinear search table in real time after eliminating time delay and gain difference; and when the system normally works, carrying out memoryless and nonlinear correction on the input signal by the concurrent processor, eliminating the memory effect, and outputting the memory effect to an emitting link. The invention is suitable for the quick-changing modern communication signal, and has the advantages of reducing out-of-band leakage and increasing frequency spectrum utilization rate and system capacity.

Description

technical field [0001] The invention relates to a processing method for linearization of a power amplifier (power amplifier), in particular to a digital pre-distortion processing method adapted to fast-changing signals. Background technique [0002] With the development of wireless communication, the signal bandwidth is getting wider and wider, and its envelope fluctuation and peak-to-average ratio are getting bigger and bigger, which puts forward higher linearity requirements for broadband signaling channels, especially mixers and power amplifiers. This is mainly because semiconductor devices have inevitable nonlinear characteristics under large signals. When the broadband transmitter works in the nonlinear region, serious intermodulation products will be generated, which can cause mutual interference between signals in the working frequency band. , generating unwanted spectral leakage outside the operating frequency band. [0003] How to improve the linearity of the syste...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L25/49H03F1/32
Inventor 杨俊
Owner SOUTH CHINA UNIV OF TECH
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