Shared-Feedback Digital Predistortion for Multi-Channel Power Amplifiers
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Solution Overview
Problem
In wireless communication systems, especially in Massive MIMO scenarios, conventional digital predistortion methods require multiple feedback links and processors for each transmit channel, leading to increased costs and complexity, and reduced processing efficiency, which affects system performance and calibration implementation.
Innovation Solution
A digital predistortion processing method and apparatus that allows multiple transmit channels to share one feedback link and one digital predistortion processor through deprecoding processing, using a feedback link to couple and convert amplified radio frequency signals into baseband signals for predistortion parameter calculation, thereby improving output linearity and efficiency of power amplifiers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a conventional digital predistortion apparatus is used for each transmit channel in Massive MIMO, then output linearity and efficiency of power amplifiers are improved, but implementation costs and device complexity increase dramatically
Solution Approach 1:
The patent merges multiple feedback links into a single shared feedback link, and combines multiple digital predistortion processors into one processor that serves all transmit channels. This consolidation reduces device complexity and implementation costs while maintaining the ability to perform digital predistortion across multiple channels through sequential processing.
Solution Approach 2:
The patent creates a universal digital predistortion processor that can handle multiple transmit channels sequentially. This single processor performs predistortion functions for all channels by processing them in turn, eliminating the need for dedicated processors for each channel and reducing overall system complexity.
2Device complexity
If digital predistortion training and processing are performed on multiple channels by turns with reduced processors, then device complexity is reduced, but digital predistortion processing efficiency decreases
Solution Approach 1:
The patent performs preliminary channel selection to identify the current active transmit channel before processing. This allows the single digital predistortion processor to efficiently determine which channel requires processing and execute the appropriate predistortion algorithms without unnecessary delays or overhead.
3Device complexity
If a single feedback link is shared among multiple channels, then implementation costs are reduced, but measurement precision for predistortion parameter calculation deteriorates
Solution Approach 1:
The patent segments the feedback processing by time-multiplexing different transmit channels through the single feedback link. Each channel's feedback signal is processed sequentially with dedicated predistortion parameter calculation, ensuring that measurement precision is maintained for each channel despite sharing the feedback infrastructure.
Data Source
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AI summary
This application relates to the field of communications technologies, and in particular, to a digital predistortion processing method and apparatus. This application provides a digital predistortion processing method and apparatus. Digital predistortion processing of a multichannel power amplifier is supported through deprecoding processing by using one feedback link and one digital predistortion processor. In addition, after being amplified by a power amplifier, a precoded signal is fed back to the feedback link for predistortion parameter calculation, to improve quality of a transmit signal. The digital predistortion processing method and apparatus that are provided in embodiments of this application are intended to improve output linearity and efficiency of a multi-transmit-channel power amplifier while reducing implementation costs and complexity of a transmit device, and further improve overall system performance.