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Nonlinear injection type linearization system and digital predistortion method

A digital predistortion and nonlinear system technology, which is applied in the direction of improving amplifiers to reduce nonlinear distortion, etc., can solve problems such as output spectrum regeneration of nonlinear systems, reduce complexity, ensure stability and reliability, and improve accuracy Effect

Active Publication Date: 2013-03-20
NINGBO UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although the performance of this predistorter is stable, the phenomenon of output spectrum regeneration of nonlinear systems (RF power amplifiers, radio frequency transmitters or optical fiber radio transmitters, etc.) The problem of regenerated components of the outer spectrum has important practical significance

Method used

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  • Nonlinear injection type linearization system and digital predistortion method
  • Nonlinear injection type linearization system and digital predistortion method
  • Nonlinear injection type linearization system and digital predistortion method

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Embodiment 1

[0038] Example one: such as figure 2 As shown, a nonlinear injection linearization system includes a digital signal processor for controlling a predistorter and extracting and delivering predistortion parameters, a regenerated spectrum digital predistorter, two residual spectrum digital predistorters, and a vector Adder, digital-to-analog converter, up-converter, analog-to-digital converter, down-converter and directional coupler, regenerative spectrum digital predistorter, 2 residual spectrum digital predistorter and digital signal processor are all connected to baseband input Signal, regenerated spectrum digital predistorter and 2 residual spectrum digital predistorters are respectively connected to the digital signal processor, regenerated spectrum digital predistorter and 2 residual spectrum digital predistorters are connected to the vector adder, vector adder Connect to the digital-to-analog converter, the digital-to-analog converter to the up-converter, the up-converter to...

Embodiment 2

[0041] Embodiment two: such as Figure 8 As shown, this embodiment is basically the same as the first embodiment. The difference is that the second residual spectrum digital predistorter is a FIR linear filter digital predistorter, and the RF power amplifier passes through the regenerative spectrum memory polynomial digital predistorter and the first residual spectrum digital predistorter. After the spectrum memory polynomial digital predistorter is linearized in parallel, the out-of-band residual spectrum is mainly caused by the memory effect. At this time, only a simple FIR linear filter digital predistorter can complete the linearization compensation of the remaining residual spectrum. Compared with the first embodiment, the system of the second embodiment has lower computational complexity and less resource overhead.

[0042] In the above two embodiments, the directional coupler and the down converter may be connected through an attenuator, and the attenuator may be an adjusta...

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Abstract

The invention discloses a nonlinear injection type linearization system and a digital predistortion method. The nonlinear injection type linearization system comprises a digital signal processor which is used for controlling a predistorter and extracting predistortion parameters, a regenerated frequency spectrum digital predistorter, n residual frequency spectrum digital predistorters, a vector adder, a digital-to-analog converter, an upper frequency converter, an analog-to-digital converter, a lower frequency converter and a directional coupler. After the digital signal processor receives and processes the regenerated frequency spectrum components or residual frequency spectrum components of a nonlinear system in real time, corresponding digital predistortion parameters are output to update the regenerated frequency spectrum digital predistorter or the residual frequency spectrum digital predistorters, and the regenerated frequency spectrum digital predistorter and each residual frequency spectrum digital predistorter compensate the nonlinearity of the nonlinear system. The nonlinear injection type linearization system and the digital predistortion method have the advantages that the commonly existing residual frequency spectrum components during linearization are eliminated, the nonlinearity of the nonlinear system is further suppressed, the output frequency spectrum with superlinearity is obtained and the complexity of parameter extraction is reduced at the same time.

Description

Technical field [0001] The invention relates to a linearization system and a digital predistortion method, in particular to a nonlinear injection linearization system and a digital predistortion method. Background technique [0002] Modern broadband wireless communication systems widely use non-constant envelope modulation methods such as Orthogonal Frequency Division Multiplexing (OFDM) and Quadrature Amplitude Modulation (QAM), which require high linearity of the transmission system. At the same time, with the increase in system capacity and the increase in spectrum utilization, ultra-high modulation modulation methods such as 256QAM, 512QAM, and even 1024QAM have been put into practical applications or will soon be used in actual large-capacity wireless communication systems. These ultra-large-capacity modulation methods place extremely high requirements on the linearity of the communication system. Among various linearization technologies, the digital predistortion lineariza...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03F1/32
Inventor 刘太君许高明叶焱惠明徐铁峰聂秋华
Owner NINGBO UNIV
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