Receiver Gain Switching Using PAPR to Prevent ADC Saturation
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Solution Overview
Problem
In wireless communication systems, high-power signals can saturate the analog-to-digital converter (ADC) of the receiver, leading to inaccurate signal representation and loss, as existing systems rely on fixed margin settings for gain state transitions, which do not account for actual signal conditions.
Innovation Solution
Adaptive determination of ADC headroom and gain state switch points based on peak-to-average power ratio (PAPR) measurements, allowing real-time adjustments to prevent saturation and optimize signal fidelity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If fixed margin settings are used for gain state transitions, then the system operation is simple, but the signal accuracy deteriorates due to ADC saturation
Solution Approach 1:
The patent implements dynamic gain state switching by continuously monitoring the PAPR of received signals and adjusting the gain state accordingly. Instead of using fixed margin settings, the system dynamically determines switch points based on actual signal characteristics, preventing ADC saturation while maintaining simple operational procedures.
Solution Approach 2:
The system changes the operating parameters by using PAPR measurements to determine optimal gain state switch points. The PAPR value serves as a dynamic parameter that adjusts the gain state transition thresholds, allowing the system to adapt to varying signal conditions and maintain high signal accuracy without excessive complexity.
2Adaptability or versatility
If fixed gain state transitions are used, then the device complexity is low, but the adaptability to different signal conditions deteriorates
Solution Approach 1:
The patent implements a feedback mechanism where the PAPR of received signals is continuously measured and used to adjust the gain state switch points. This closed-loop control enables the system to adapt to different signal conditions automatically, improving versatility while keeping the control logic relatively simple through standardized feedback processing.
Solution Approach 2:
The system performs self-adjustment by autonomously monitoring its own input signal characteristics and modifying its gain state transitions accordingly. The PAPR measurement and automatic switch point determination enable the receiver to serve itself, adapting to varying signal conditions without external intervention or complex pre-programming.
3Measurement precision
If dynamic PAPR-based adjustments are made, then the signal fidelity is improved, but the processing complexity increases
Solution Approach 1:
The patent performs preliminary PAPR measurement and analysis before making gain state decisions. By pre-calculating the PAPR value and comparing it against threshold criteria, the system prepares the necessary information in advance, enabling accurate signal fidelity maintenance while simplifying the real-time processing burden through pre-computed parameters.
Data Source
AI summary
A method for wireless communication at a user equipment (UE) and related apparatus are provided. In the method, the UE measures a peak-to-average power ratio (PAPR) of an input signal. The PAPR includes the ratio of the peak power above a percentile to the average power of the input signal. The UE further processes the input signal based on a gain state (GS) for the input signal. The GS is determined based on the PAPR and the received signal strength indicator (RSSI) measured for the input signal.