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Digital pre-distortion (DPD) processing method for multi-mode RRU

A digital pre-distortion and processing method technology, applied in the field of multi-mode RRU, can solve the problem of no multi-mode digital pre-distortion algorithm

Active Publication Date: 2019-03-12
SUNWAVE COMM
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  • Abstract
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  • Application Information

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Problems solved by technology

However, when the multi-mode RRU is working, there is only one narrowband signal transmission. For example, in the GSM+LTE multimode RRU, only the GSM signal is used. In this case, DPD is required to be able to handle the nonlinearity of the narrowband signal. calibration
Therefore, the prior art does not have a true multi-mode digital pre-distortion algorithm RRU

Method used

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  • Digital pre-distortion (DPD) processing method for multi-mode RRU
  • Digital pre-distortion (DPD) processing method for multi-mode RRU
  • Digital pre-distortion (DPD) processing method for multi-mode RRU

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Embodiment Construction

[0033] The present invention will be described in detail below in conjunction with accompanying drawing:

[0034] Such as figure 1 As shown, the RRU of multi-mode digital predistortion includes serial-to-parallel conversion interface, CPRI decoding module, digital up-conversion module, peak clipping module, DPD processing module, DAC (digital-to-analog conversion module), ADC (analog-to-digital conversion module), power amplifier downlink and feedback link.

[0035] The serial-to-parallel conversion interface is connected with an external photoelectric conversion module, and can receive the CPRI protocol code stream transmitted from the optical fiber; the photoelectric conversion module realizes the mutual conversion of optical signals and electrical signals. The transmitted signal of a certain wavelength is converted into a differential electrical signal after passing through the optical module, and the serial-to-parallel conversion interface converts the serial signal repre...

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Abstract

The invention discloses a digital pre-distortion (DPD) processing method for a multi-mode RRU. The method comprises the following steps: a DPD processing module carries out time delay calculation according to captured forward downlink signals and captured feedback signals, and carries out alignment processing on the forward downlink signals and the feedback signals; matrix modeling is carried outon the forward downlink signals and the feedback signals which are aligned through a memory polynomial model, so that a pre-distortion coefficient is calculated; and the pre-distortion coefficient isused on the forward downlink signals, and pre-distorted downlink signals are output to a power amplifier, so that the linearity of the power amplifier and the demodulation performance of multi-mode signals can be improved. The method disclosed by the invention has the following beneficial effects: non-linear distortion of the multi-mode signals can be calibrated; and compared with the prior art, the method has the advantages that the DPD processing module adopts the multi-mode DPD algorithm, so that single-mode broadband signals, single-mode narrowband signals and multi-mode broadband signalscan be processed.

Description

technical field [0001] The invention relates to the field of multi-mode RRU, and mainly relates to a digital pre-distortion processing method applied to the multi-mode RRU. Background technique [0002] Radio Remote Unit (RRU) is a new type of distributed network coverage mode, which converts baseband optical signals into radio frequency signals at the remote end to amplify and transmit them. In the current situation where multi-standard signals coexist, the multi-mode RRU can transmit wireless signals of multiple modes at the same time. [0003] In a single-mode RRU, DPD technology (Digital Pre-Distortion) is often used to pre-distort the output signal. While increasing the signal transmission power, it reduces the impact of signal distortion, thereby ensuring the transmission quality of the signal. In the case of improving the operating efficiency of the power amplifier. In the multi-mode RRU, it is also necessary to perform DPD processing on multi-mode signals. [0004...

Claims

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Application Information

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IPC IPC(8): H04L25/49
CPCH04L25/49
Inventor 吴涛陈高强徐锡强洪杭迪
Owner SUNWAVE COMM
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