RSSI Temperature Compensation via Interpolation Coefficients
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Solution Overview
Problem
Existing temperature compensation methods for Received Signal Strength Indicator (RSSI) in power measurement are complex and inaccurate due to variations in ambient temperature, leading to inaccuracies in power measurement results.
Innovation Solution
A temperature compensation apparatus and method that uses a temperature sensor to measure current temperature and selects appropriate temperature compensation coefficients from prestored values for normal, low, and high temperatures, applying these coefficients to output signals of the RSSI to perform digital compensation, thereby improving accuracy through interpolation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If temperature compensation values are stored under various temperatures and selected according to current temperature, then temperature compensation can be performed, but the storage size and hardware complexity increase
Solution Approach 1:
The patent changes the parameter representation from storing complete compensation values to storing only compensation coefficients. These coefficients are then used to calculate compensation values dynamically based on the temperature sensor reading, reducing storage requirements while maintaining compensation capability across various temperatures
Solution Approach 2:
The system uses the temperature sensor to automatically determine the current temperature and select or calculate the appropriate compensation coefficient without requiring external intervention or complex lookup tables, enabling the system to self-adjust to temperature variations
2Measurement precision
If more temperature points are measured and stored, then compensation accuracy is improved, but storage size increases
Solution Approach 1:
The patent transforms the storage requirement from storing multiple complete compensation curves or tables to storing only a few key temperature coefficients. These coefficients mathematically define the compensation characteristics across the temperature range, significantly reducing storage size while preserving accuracy
Solution Approach 2:
Instead of storing actual compensation values at every temperature point, the patent uses coefficients that represent or copy the essential temperature compensation characteristics. These coefficients can generate the necessary compensation values through calculation, acting as a compressed representation of the full compensation data
Data Source
AI summary
Embodiments of the present invention provide a temperature compensation method and apparatus for a received signal strength indicator. The apparatus comprises a temperature sensor configured to measure a current temperature; and a digital compensation module configured to select a temperature compensation coefficient from prestored temperature compensation coefficients corresponding to a normal temperature, a low temperature and a high temperature according to the current temperature, and perform temperature compensation on output signals of the RSSI according to the selected temperature compensation coefficient. With the method and apparatus of the embodiments of the present invention, the accurate power values of the input signals of the RSSI under any temperatures can be obtained by measuring the characteristics of the RSSI under the predefined three temperatures, and using an interpolation method to compensate for the temperature characteristics of the RSSI. In comparison with the relevant art, the size of the storage is decreased and the accuracy of temperature compensation is improved.