Power-Efficient Crest Factor Reduction with Predictive Peak Gating
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Solution Overview
Problem
Power amplifiers in base stations experience reduced efficiency and increased power consumption due to high peak-to-average power ratio (PAR) in transmit signals, leading to out-of-band emissions and spectral mask violations, which existing Crest Factor Reduction (CFR) techniques fail to address efficiently.
Innovation Solution
Implementing a Crest Factor Reduction (CFR) circuitry with peak neighborhood analyzers, peak detection, and cancellation phasor control to predict peak absence, enabling selective gating of circuit components and applying peak corrections, thereby reducing power consumption and improving efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If Crest Factor Reduction (CFR) operations are applied to improve power amplifier efficiency and dynamic range, then power amplifier efficiency and RMS power are improved, but power consumption of CFR operations becomes significant
Solution Approach 1:
The patent applies preliminary action by using a peak neighborhood analyzer to predict the presence of peaks before the actual peak detection and CFR processing occurs. This allows the system to prepare and condition signals in advance, enabling selective gating of subsequent processing stages to avoid unnecessary power consumption when no peaks are present.
Solution Approach 2:
The patent implements dynamics by making the CFR processing adaptive and conditional rather than continuous. The system dynamically adjusts its operation based on real-time signal analysis, enabling or disabling CFR processing only when peaks are detected or predicted, thereby optimizing the balance between power amplifier efficiency and CFR power consumption.
2Object-affected harmful factors
If continuous peak detection and CFR processing are performed to maintain signal quality, then out-of-band emissions and spectral mask violations are reduced, but power consumption increases
Solution Approach 1:
The patent applies periodic action by implementing continuous monitoring through the peak neighborhood analyzer while performing actual CFR processing only periodically when peaks are detected. This creates a rhythm of light monitoring combined with intensive processing only when necessary, reducing overall power consumption while maintaining signal quality.
Solution Approach 2:
The patent extracts the essential monitoring function from the full CFR processing chain. The peak neighborhood analyzer continuously monitors for peak conditions and extracts only the necessary information to gate the more power-intensive CFR processing, separating the low-power monitoring function from the high-power correction function.
Data Source
AI summary
Crest factor reduction circuitry includes: a peak neighborhood analyzer; peak detection circuitry and a controller. The peak neighborhood analyzer is configured to: receive an input signal; analyze the input signal to determine whether a peak larger than a target threshold is expected within an interval; and provide a first control signal responsive to determining that a peak larger than the target threshold is expected within the interval. The controller is configured to: receive the first control signal; and gate a clock or data to the peak detection circuitry responsive to the first control signal.