Digital pre-distortion system and method of concurrent dual-band envelope tracking power amplifier

A technology of digital pre-distortion and power amplifier, applied in the direction of improving amplifiers to reduce nonlinear distortion, amplifiers, amplifiers with semiconductor devices/discharge tubes, etc., can solve problems such as processing bandwidth limitations, reduce design pressure, and reduce bandwidth , Reduce the effect of RF signal bandwidth

Active Publication Date: 2018-01-09
SOUTHEAST UNIV
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Problems solved by technology

[0008] However, the actual communication system has a relatively large limitation on the processing bandwidth. Combined with the characteristics of the dual-band power amplifier in the above-mentioned envelope tracking situation, a digital pre-distortion technology with a narrow bandwidth and good linearization effect is required.

Method used

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  • Digital pre-distortion system and method of concurrent dual-band envelope tracking power amplifier
  • Digital pre-distortion system and method of concurrent dual-band envelope tracking power amplifier
  • Digital pre-distortion system and method of concurrent dual-band envelope tracking power amplifier

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Embodiment Construction

[0031] Such as figure 1 As shown, a kind of digital predistortion system of this embodiment is aimed at co-generation dual-band power amplifier within a specified bandwidth,

[0032] This embodiment is aimed at the behavioral modeling of the power amplifier: (1) considering the distortion caused by cross-modulation between signals in two frequency bands, (2) considering the nonlinear distortion caused by the envelope tracking method, (3) considering Specifies the effect of the bandwidth filter on the linearization implementation and effect. The power amplifier behavior characteristic model formula is as follows,

[0033]

[0034]

[0035] Among them, M is the memory depth, K is the order of high-order nonlinear distortion, L is the order of the envelope tracking signal, x 1 and x 2 Indicates the baseband input signal, y 1 and y 2 Represents the baseband power amplifier output signal, α represents the coefficient of each sub-item, h filter is the frequency response ...

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Abstract

The invention discloses a digital pre-distortion system and a digital pre-distortion method of a concurrent dual-band envelope tracking power amplifier within specified bandwidth. Modeling aiming at behaviors of the power amplifier considers the following points of 1, distortion caused by cross modulation between signals in two frequency bands; 2, nonlinear distortion caused by an envelope tracking method; and 3, influence of a filter with specified bandwidth on linearization implementation method and effect. The radio frequency signal bandwidth in a traditional digital pre-distortion and power amplification linearization technology is reduced, the bandwidth of an envelope tracking signal is also reduced, and design pressure of an envelop modulator can be effectively relieved; meanwhile, the condition that power of a pre-distortion signal is identical with that of an initial input signal is ensured, iterations are performed, and thus the good power amplification linearization effect isachieved; and the system and the method have wide application prospects in the broadband application.

Description

technical field [0001] The invention relates to a digital predistortion system and method for co-transmission dual-band envelope tracking power amplifiers, and belongs to the technical field of digital linearization of power amplifiers. Background technique [0002] The rapid development of wireless communication systems has created new requirements for power amplifiers. On the one hand, multi-band, multi-communication standard base stations are becoming more and more popular, leading to the emergence of co-generation multi-band power amplifiers; on the other hand, high-power amplifiers have also become a research hotspot, and envelope tracking is one of the effective methods to improve power amplifier efficiency. Both scenarios put forward higher requirements on the linearity of the power amplifier. Digital predistortion technology is a very effective method widely used in engineering practice to compensate the nonlinearity of power amplifiers. Although power amplifiers wi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03F1/32H03F3/195H03F3/213
Inventor 余超陆倩云孟凡朱晓维
Owner SOUTHEAST UNIV
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