RF Signal Control Device for Digital Pre-Distortion Linearity
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Solution Overview
Problem
Current digital pre-distortion power amplifier systems using RF input ports suffer from poor linearity performance and signal quality, leading to suboptimal communication network coverage due to the limitations of RF signal processing compared to systems using I/Q baseband signal input ports.
Innovation Solution
An RF signal control method and device that adjusts the up-converter and down-converter gain attenuation values based on parameter information of the output RF signal, and uses a linear filter with determined center frequencies and bandwidths to improve linearity and signal quality through digital pre-distortion and power amplification.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If digital pre-distortion technology is adopted to achieve linear adjustment of power amplifiers, then linearity performance is improved, but device complexity increases due to multiple processing stages including down-conversion, A/D conversion, pre-distortion processing, and up-conversion
Solution Approach 1:
The patent applies preliminary action by performing pre-distortion processing on the signal before power amplification. The baseband signal undergoes pre-distortion in the digital domain before being converted to RF and amplified, which compensates for the non-linear characteristics of the power amplifier in advance, thereby improving linearity performance while managing system complexity through upfront signal conditioning
Solution Approach 2:
The patent uses an intermediary approach by introducing a complex signal processing chain including down-converter, A/D converter, pre-distortion processor, and up-converter as intermediary stages between the input signal and power amplifier. These intermediary components enable precise linear control through digital processing while isolating the non-linear power amplifier from direct signal control
2Measurement precision
If I/Q baseband signal input port is used for digital pre-distortion processing, then signal processing quality is improved, but adaptability deteriorates because it cannot be used in equipment that only has RF input ports
Solution Approach 1:
The patent achieves universality by designing a system that can handle both I/Q baseband signals and RF signals through the same RF input port. The down-conversion stage converts RF signals to baseband, enabling the digital pre-distortion processing chain to process both types of inputs uniformly, thus making the equipment adaptable to different signal types and expanding its application scope
Solution Approach 2:
The patent introduces down-conversion and A/D conversion as intermediary steps that enable RF signals to be processed in the digital domain. This intermediary transformation allows equipment with RF input ports to achieve the same high-quality signal processing as equipment with I/Q baseband input ports, thereby improving adaptability without sacrificing processing quality
3Manufacturing precision
If RF signals are processed through down-converter and A/D converter for digital pre-distortion, then linearity control is improved, but signal quality deteriorates due to the limitations of RF signal processing compared to baseband processing
Solution Approach 1:
The patent replaces direct RF signal processing with digital baseband signal processing by substituting the mechanical/electrical RF processing path with a digital signal processing path. The RF signal is converted to baseband and processed digitally, which provides superior linearity control and signal quality compared to analog RF processing, while still maintaining the ability to handle RF input signals
Data Source
AI summary
The present invention describes a RF signal control method and device that adjusts the first down-converter gain attenuation and uses the adjusted first down-converter gain attenuation to change the RF signal. The RF signal control method and device also uses a determined linear filter parameter to perform linearity improvement on the digital signal after the RF signal goes through a down-converter and analog-to-digital converter. The RF signal control method and device use an increased up-converter gain attenuation value to correct the RF input signal after digital pre-distortion operation, so that the adjusted and/or improved signals after power amplification have better quality than the RF signal with just a simple analog-to-digital converter and clipping equipment. Thus, the current application improves the linearity effect of digital pre-distortion operation and the dynamic effect of the power amplifier operation, thereby promoting the coverage effect of the RF output signal.