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Digital predistortion method and device

A digital pre-distortion and pre-distortion technology, applied in the field of communication

Active Publication Date: 2011-04-13
ZTE CORP
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In order to solve the above technical problems, the present invention proposes a digital predistortion method and device to effectively deal with the non-linear problem of power amplifiers in two frequency bands, so as to meet the linearity requirements of the system

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  • Digital predistortion method and device

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Embodiment Construction

[0073] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0074] The digital pre-distortion method of the present invention uses forward signals and feedback signals of two frequency bands to estimate pre-distortion parameters, and then performs pre-distortion processing on the forward signals by updating a lookup table, thereby greatly improving the linear performance of the power amplifier of the transmitter.

[0075] The invention provides a digital predistortion method, the method comprising:

[0076] Step 1, extracting combined feedback signals of two frequency bands;

[0077] This step is specifically: filter the power amplifier coupling feedback data to filter out-of-band high-order intermodulation interference; perform frequency mixing processing on the filtered signal to obtain an analog demodulated signal; perform modulus on the demodulated signal Convert to obtain the combined fe...

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Abstract

The invention provides a digital predistortion method and device. The method comprises the following steps: extracting combining feedback signals of two frequency bands; estimating a predistortion parameter according to the forward combining signals of the two frequency bands, a forward signal of each frequency band and the combining feedback signals; and acquiring a coefficient required by predistortion processing according to the predistortion parameter and the amplitude information of the forward signals of the two frequency bands, and outputting a predistortion signal according to the coefficient and the forward combining signals. The digital predistortion method and device overcome the strict requirement of dual-frequency broadband distortion technology on the required analog digital conversion speed, and reduce hardware resource consumption of the system by adopting a two-dimensional processing mode so as to ensure that the method and device provided by the invention is more applicable to dual-frequency band digital distortion processing.

Description

technical field [0001] The invention relates to communication technology, in particular to a digital predistortion method and device. Background technique [0002] The spectrum resources obtained by mobile communication operators are generally discontinuous and often scattered in different frequency bands. At present, the technology used in the operation of base stations in multiple frequency bands is independent power amplifier and recombination. Its disadvantages are high cost and low efficiency. ,Big size. Such as figure 1 As shown, it is a structural schematic diagram of a dual power amplifier used in the existing dual-band pre-distortion technology. The existing dual-band pre-distortion technology uses two independent power amplifiers to perform pre-distortion respectively, and then process the dual-band signal in a combined way. The above solution adopts the traditional digital pre-distortion technology, which is easy to process and does not require a high analog-to-...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L25/49
Inventor 杨泽亮宁东方曾峰詹姆士·普若拉斯游爱民戴征坚潘卫明向际鹰
Owner ZTE CORP
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