Digital Predistortion Receive Chain Tuning for Cost Reduction
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Solution Overview
Problem
Existing digital predistortion methods require complex and costly dedicated chains for data collection, which introduce new nonlinear distortion and complicate the compensation of power amplifier nonlinearity, leading to increased error codes and non-compliance with 3GPP protocols.
Innovation Solution
A digital predistortion processing method that tunes the frequency of a local oscillator and band-pass filter in the receive chain to the transmitting frequency of a user terminal, allowing the existing receive chain to perform predistortion factor updates, thereby simplifying the structure and reducing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an independent dedicated chain for collecting data output by the power amplifier is used, then the predistortion processing can be implemented, but the device complexity and cost increase significantly
Solution Approach 1:
The receive chain is designed to perform multiple functions: normal signal reception and predistortion data collection. By configuring the existing receive chain components (band-pass filter, local oscillator, low-pass filter) to operate in a data collection mode, the patent eliminates the need for a separate dedicated chain, thereby reducing device complexity while maintaining predistortion processing capability
Solution Approach 2:
The patent merges the data collection function with the existing receive chain structure. The receive chain components are reused for both their original reception purpose and the new predistortion data collection purpose, combining multiple functions into a single integrated system rather than maintaining separate independent chains
2Reliability
If an independent dedicated chain is used for data collection, then predistortion can be achieved, but new nonlinear distortion is introduced in the collection chain
Solution Approach 1:
The receive chain, which is already optimized for receiving signals with specific characteristics, is used to collect predistortion data. Since the receive chain is designed to handle the expected signal types and frequency ranges, it introduces minimal additional nonlinear distortion compared to a dedicated collection chain that would require additional components and adjustments
3Reliability
If a dedicated collection chain is implemented, then data for predistortion can be collected, but additional functions like eliminating residual frequency deviation and correcting sampling deviation are required
Solution Approach 1:
The existing receive chain components are utilized for data collection with inherent frequency and sampling characteristics already optimized for reception. This eliminates the need for additional correction functions that would be required in a dedicated collection chain, as the receive chain's design already accounts for frequency deviation and sampling requirements
Data Source
AI summary
Embodiments of the present invention provide a digital predistortion processing method and a user terminal, which relate to the field of communications, and can simplify the structure of a digital predistortion apparatus and reduce the cost. The method includes: setting a control command; and tuning, when the control command is selecting a data collection mode as the working mode of a receive channel, the frequency of a local oscillator and the central frequency of a band-pass filter in the receive channel to the transmitting frequency of the user terminal, so that the user terminal performs predistortion factor update. The embodiments of the present invention are applied to the user terminal for digital predistortion processing.