CFR Peak Prediction Gating for Power Amplifier Efficiency
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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 do not adequately address.
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 cancellation, 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 in advance by determining whether CFR operations are necessary, thereby avoiding unnecessary processing and reducing power consumption while maintaining power amplifier efficiency when peaks are actually present
Solution Approach 2:
The patent implements partial action by selectively applying CFR operations only in specific conditions - namely when the peak neighborhood analyzer predicts peaks are present and the peak detector actually detects them. This partial application of CFR processing reduces overall power consumption compared to continuous CFR operations, while still providing the efficiency benefits when needed
2Measurement precision
If peak detection circuitry continuously monitors the transmit signal to detect peaks, then peak detection accuracy is improved, but power consumption increases
Solution Approach 1:
The peak neighborhood analyzer performs preliminary analysis of the signal to predict peak presence before the peak detection circuitry is activated. This preliminary action allows the system to maintain high peak detection accuracy when needed while avoiding continuous operation of the power-consuming peak detection circuitry, thereby reducing overall power consumption
Solution Approach 2:
The patent implements periodic action by activating peak detection circuitry only during intervals when peaks are predicted to be present, rather than continuously monitoring the signal. This periodic operation maintains detection accuracy for actual peaks while significantly reducing power consumption during intervals when no peaks are expected
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.