Shared DPD Feedback Path for Multi-Band Power Amplifiers
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Solution Overview
Problem
Multi-path communication devices using digital pre-distortion (DPD) power amplifiers face increased size and manufacturing costs due to the need for multiple independent DPD feedback paths for processing signals across different frequency bands.
Innovation Solution
A communication device design that shares a single DPD feedback path by using a DPD processing unit to pre-distort signals, a power amplifying unit to amplify signals, a signal combining unit to combine feedback signals, and a signal selection unit to select specific feedback signals, thereby reducing the number of required feedback paths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple independent DPD feedback paths are used for each transmission path in multi-path communication devices, then signal processing accuracy for different frequency bands is improved, but device size and manufacturing cost increase
Solution Approach 1:
The patent merges multiple independent DPD feedback paths into a single shared feedback path. The feedback signals from multiple transmission paths are combined through a signal combining unit that uses control signals to selectively route and combine the feedback signals, allowing a single DPD processing unit to serve multiple transmission paths without requiring separate feedback paths for each path.
Solution Approach 2:
The DPD processing unit is designed to handle multiple frequency bands and transmission paths universally. By receiving combined feedback signals from multiple paths and using control signals to selectively process the appropriate feedback signal for each transmission path, the single DPD processing unit performs the function of multiple dedicated units, reducing overall device complexity while maintaining processing accuracy.
2Measurement precision
If multiple independent DPD feedback paths are used for each transmission path in multi-path communication devices, then signal processing accuracy for different frequency bands is improved, but manufacturing cost increases
Solution Approach 1:
The patent merges multiple independent DPD feedback paths into a single shared feedback path. The feedback signals from multiple transmission paths are combined through a signal combining unit that uses control signals to selectively route and combine the feedback signals, allowing a single DPD processing unit to serve multiple transmission paths without requiring separate feedback paths for each path.
Solution Approach 2:
The DPD processing unit is designed to handle multiple frequency bands and transmission paths universally. By receiving combined feedback signals from multiple paths and using control signals to selectively process the appropriate feedback signal for each transmission path, the single DPD processing unit performs the function of multiple dedicated units, reducing overall device complexity while maintaining processing accuracy.
Data Source
AI summary
The present invention, which relates to a multi-path communication device for sharing a feedback path for digital pre-distortion, includes: a DPD processing unit configured to output a plurality of pre-distorted signals by respectively pre-distorting a plurality of input signals, to output an nth control signal when an nth input signal is input, and to output an nth pre-distorted signal using an nth feedback signal input in response to the nth control signal; a power amplifying unit configured to amplify each of the plurality of pre-distorted signals and output a plurality of amplified signals; a signal combining unit configured to combine some of each of the plurality of amplified signals and output combined feedback signal; and a signal selection unit configured to select and output only the nth feedback signal from the combined feedback signal according to the input nth control signal, thereby preventing an increase in the size of a device and manufacturing cost thereof caused by a plurality of DPD feedback paths.