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DPD lookup table generation method and device

A look-up table, input signal technology, applied in the parts, amplifier types, electrical components, etc. of amplifying devices, which can solve problems such as FPGA resources and power consumption increase

Active Publication Date: 2019-12-06
DATANG MOBILE COMM EQUIP CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

High sampling rate will double FPGA resources and power consumption

Method used

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  • DPD lookup table generation method and device
  • DPD lookup table generation method and device
  • DPD lookup table generation method and device

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Embodiment Construction

[0034] In the communication system, the memory polynomial (MP) model is a commonly used DPD model that can correct the memory effect of the power amplifier, and its expression can be shown as follows:

[0035]

[0036] Among them, y(n) is the signal output by the power amplifier, x(n) is the signal input to the power amplifier, the maximum memory depth of the DPD model is M, the maximum nonlinear order is P, a mp is the coefficient of the memory item whose memory depth is m and nonlinear order is p, and LUT (look-up-table) is a DPD lookup table. The LUT can be trained according to the input signal and the output signal of the power amplifier, and is used to reflect the characteristics of the power amplifier. The LUT includes coefficients corresponding to different signal amplitudes. When performing DPD processing on a signal, the corresponding coefficients can be queried according to the signal amplitude, and the signal is subjected to DPD processing with the queried coeffi...

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Abstract

The invention discloses a DPD lookup table generation method and device. The method comprises the following steps: respectively increasing the sampling rates of an input signal and an output signal ofthe power amplifier; according to the DPD model, determining a power amplifier characteristic coefficient by utilizing the input signal and the output signal of which the sampling rate is increased;obtaining a LUT according to the power amplifier characteristic coefficient and the input signal after the sampling rate is improved; and respectively weighting the LUTs according to the obtained weights of the LUTs, and extracting the weighted LUTs according to the sampling rate improvement multiple. According to the invention, the signal sampling rate can be improved, and the increase of resources and power consumption can be avoided.

Description

technical field [0001] The present invention relates to the technical field of wireless communication, in particular to a method and device for generating a digital pre-distortion (digital pre-distortion, DPD) lookup table. Background technique [0002] The rapid growth of mobile broadband users around the world, as well as the continuous emergence of new services such as instant messaging, social networking, file sharing, mobile video, and mobile cloud computing, have brought about a rapid increase in mobile users' demand for data volume and data rate. In order to meet user requirements, signal bandwidth needs to be increased. Currently, the 4G network long term evolution (LTE) system supports 3-carrier configuration with a maximum signal bandwidth of 60MHz. The 5G system may require at least a single-carrier signal bandwidth of 100MHz, and a multi-carrier signal bandwidth of 500MHz or more than 700MHz. [0003] In the communication system, in order to improve the lineariz...

Claims

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Application Information

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IPC IPC(8): H03F1/32H03F3/195H03F3/213H03F3/24
CPCH03F1/3241H03F3/195H03F3/213H03F3/245H03F2200/451
Inventor 张永丽孙华荣王杰丽伍坚
Owner DATANG MOBILE COMM EQUIP CO LTD
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