Digital pre-distortion processing method based on memory and cross memory polynomial model

A memory polynomial and digital pre-distortion technology, applied in the field of communication, can solve problems such as the inability to achieve a balance between precision and complexity, and achieve the effect of reducing complexity and improving precision

Inactive Publication Date: 2019-10-15
UNIV OF ELECTRONIC SCI & TECH OF CHINA
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Problems solved by technology

[0022] Aiming at the deficiency that the traditional digital pre-distortion method cannot achieve the balance between accuracy and complexity, the present invention proposes

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  • Digital pre-distortion processing method based on memory and cross memory polynomial model
  • Digital pre-distortion processing method based on memory and cross memory polynomial model
  • Digital pre-distortion processing method based on memory and cross memory polynomial model

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Embodiment Construction

[0051] The technical solution of the present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0052] The present invention simplifies the Volterra series model. In addition to the elements on the diagonal, some off-diagonal elements are reserved to increase the modeling accuracy. In addition, combined with the DDR model, a MCMP (Memory And Cross Memory Polynomial) memory is proposed. With the cross-memory polynomial model, this model combines the MP and DDR models, and then deletes some high-order nonlinear dynamic items. Its complex baseband mathematical expression is as follows:

[0053]

[0054] It can be seen that the first term is the memory polynomial model, which mainly retains the diagonal term of the Volterra series model. The second term is a low-order nonlinear dynamic cross term, which is used to retain the off-diagonal terms of the Volterra series model. Because it is very similar to the memor...

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Abstract

The invention discloses a digital pre-distortion processing method based on a memory and cross memory polynomial model. The method includes: carrying out modulo operation on each input baseband signalto obtain the amplitude corresponding to each input baseband signal; delaying each input baseband signal and solving the modulus to obtain the amplitude of a delayed signal, wherein the amplitude ofeach input baseband signal and the amplitude of the delayed signal respectively pass through an address mapping unit and then are used as an address index of a lookup table to look up a correspondingcrossed item pre-distortion coefficient and a corresponding non-crossed item pre-distortion coefficient; and establishing a memory and cross memory polynomial model, multiplying the input signals after time delay alignment by the corresponding pre-distortion coefficients and amplitudes, accumulating the multiplied input signals to serve as signal output after pre-distortion processing, and performing digital pre-distortion processing on each input baseband signal according to the memory and cross memory polynomial model to obtain output baseband signals. According to the invention, the compromise of modeling precision and calculation complexity can be realized.

Description

technical field [0001] The invention belongs to the digital pre-distortion processing technology in the communication field, in particular to a digital pre-distortion processing method based on memory and cross-memory polynomial models. Background technique [0002] In recent years, with the rapid development of semiconductor technology, wireless communication technology has achieved a qualitative leap. In order to meet the growing business needs of consumers, major operators around the world have been working to improve the data transmission rate of communication systems. From 14.4Kbps of GSM to 100Mbps of 4G, and then to 1Gbps of 5G in the future. Shannon's theorem tells us that to increase the data transmission rate, it is necessary to increase the data transmission bandwidth, which also brings serious in-band intermodulation distortion in addition to the out-of-band harmonic distortion of the signal. In addition, spectrum resources are very precious. In order to improve...

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Application Information

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IPC IPC(8): H03F1/32
CPCH03F1/3241
Inventor 方健张二丽罗云钟关晓明赖荣兴张波
Owner UNIV OF ELECTRONIC SCI & TECH OF CHINA
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