Wireless Transmitter DPD Mode Switching for Power Transients
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Solution Overview
Problem
Existing wireless transmitters face performance degradation due to rapid changes in output signal power, particularly upwards power transients, which previous solutions have addressed inefficiently, often requiring resource-hungry logic or memory updates.
Innovation Solution
Implementing a DPD logic that switches to pre-stored coefficients when the output power exceeds a threshold, reducing the duration and effect of upwards power transients by comparing transmitted power with a power threshold and using a time-decaying update power threshold to ensure coefficient relevance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If continuously-updating DPD mode is used to track rapid power changes, then DPD accuracy is maintained, but computational resources and processing time are excessively consumed
Solution Approach 1:
The patent implements a dynamic mode switching mechanism that adapts between pre-stored DPD mode and continuously-updating DPD mode based on power transient conditions. The DPD logic monitors power changes and selectively activates continuous updating only when necessary (during significant upward transients), while using pre-stored coefficients during stable operation, thus optimizing the balance between accuracy and resource consumption
Solution Approach 2:
The patent changes the operational parameter of DPD coefficient updating frequency based on power signal conditions. During normal operation, pre-stored coefficients are used with minimal processing. When an upward power transient is detected (exceeding a threshold), the system switches to continuous updating mode to maintain accuracy, then returns to pre-stored mode after the transient subsides, thereby reducing overall computational burden
2Productivity
If pre-stored DPD coefficients are used to reduce processing load, then resource constraints are alleviated, but spectral performance degrades during rapid power transients
Solution Approach 1:
The patent incorporates feedback mechanisms where the DPD logic continuously monitors the power signal for transient conditions. When rapid upward power changes are detected, the system receives feedback to switch from pre-stored coefficient mode to continuous updating mode, ensuring spectral performance is maintained during critical transients while preserving processing efficiency during stable operation
Solution Approach 2:
The patent prepares pre-stored DPD coefficients in advance for common operating conditions, allowing immediate use without real-time computation. This preliminary preparation enables the system to handle normal operations efficiently while having pre-computed correction factors ready, reducing the need for continuous heavy processing unless transients occur
3Adaptability or versatility
If continuous DPD coefficient updating is performed, then adaptation to power changes is improved, but the duration and effect of upwards power transients are prolonged
Solution Approach 1:
The patent employs periodic monitoring of power transients with threshold-based triggering. Instead of continuous updating, the system periodically checks for upward power transients exceeding a defined threshold and activates continuous DPD updating only during these specific periods. This periodic approach maintains necessary adaptability while significantly reducing the overall duration of high-computation modes, thereby reducing transient effects
Data Source
AI summary
Embodiments may relate to digital predistortion (DPD). DPD logic may identify whether the wireless signal output power of a wireless signal that is to be transmitted is above a power threshold. The signal output power is over (or, in some embodiments, equal to) the power threshold, then the DPD logic may operate in accordance with a pre-stored DPD mode wherein DPD is performed on the wireless signal based on one or more pre-stored DPD coefficients. If the signal output power is under (or, in some embodiments, equal to) the power threshold, then the DPD logic may operate in accordance with a continuously-updated DPD mode. Other embodiments may be described or claimed.