Feedback Receiver Sample Gating for Faster Antenna Tuning
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Solution Overview
Problem
Conventional feedback receivers in communication devices require long measurement times and numerous sensors to accurately determine impedance mismatches, leading to increased size and cost, as well as inaccuracies due to wide variations in signal amplitudes and practical limitations.
Innovation Solution
A feedback receiver that selectively accumulates RF signal samples based on the amplitude of a baseband signal within a defined selection corridor, averaging these samples to provide accurate impedance measurements for antenna tuner adjustments, thereby reducing measurement time and increasing precision.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional feedback receivers measure impedance over long periods to reduce errors, then measurement accuracy is improved, but measurement time increases and productivity decreases
Solution Approach 1:
The system performs preliminary classification of signal amplitudes into acceptable and unacceptable ranges before full impedance measurement. By pre-identifying and filtering out unacceptable amplitude samples, the system avoids wasting measurement time on samples that would require correction anyway, thus reducing total measurement time while maintaining accuracy.
Solution Approach 2:
The measurement process is segmented into multiple phases: amplitude classification, selective accumulation of acceptable samples, identification of unacceptable samples, and corrective action generation. This segmentation allows the system to efficiently process only relevant data portions and apply targeted corrections, improving both speed and accuracy.
2Measurement precision
If feedback receivers accumulate and average many RF signal samples to reduce measurement errors, then measurement precision is improved, but the complexity of the system increases
Solution Approach 1:
The system performs preliminary classification of signal amplitudes into acceptable and unacceptable ranges before full impedance measurement. By pre-identifying and filtering out unacceptable amplitude samples, the system avoids wasting measurement time on samples that would require correction anyway, thus reducing total measurement time while maintaining accuracy.
Solution Approach 2:
The measurement process is segmented into multiple phases: amplitude classification, selective accumulation of acceptable samples, identification of unacceptable samples, and corrective action generation. This segmentation allows the system to efficiently process only relevant data portions and apply targeted corrections, improving both speed and accuracy.
3Adaptability or versatility
If conventional systems use multiple sensors to detect various use cases, then detection capability is improved, but device size and cost increase
Solution Approach 1:
The feedback receiver is designed to perform multiple functions: it not only measures impedance but also classifies signal amplitudes, identifies unacceptable samples, and generates corrective actions. This multi-functional approach eliminates the need for separate dedicated sensors for each use case, reducing overall system complexity while maintaining comprehensive detection capability.
Data Source
AI summary
Some embodiments of the present disclosure relate to a feedback receiver comprising a threshold comparator configured to determine if the amplitude of a baseband signal is within a selection corridor (e.g., defined by an upper and lower threshold value). If the amplitude is within the selection corridor, a feedback receiver is configured to accumulate RF signal samples (e.g., amplitude and phase samples) over a time period. The accumulated RF signal samples, which correspond to substantially constant baseband amplitude values, are then averaged. The calculated averages are utilized for impedance measurements used tune an antenna tuner to limit impedance mismatch. By limiting RF amplitude and phase sample collection to associated baseband signals having an amplitude falling within the selection corridor, substantially equal average amplitudes and phases can be achieved over a relatively short measurement period (i.e., without the need for long measurement period).