Wireless Transmitter Self-Calibration Using Power Detector Correlation
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Solution Overview
Problem
Traditional methods for calibrating wireless transmitter output power are time-consuming and costly, requiring significant iterations and manual intervention, especially in difficult-to-reach locations, and fail to account for changes in transmit power over time, affecting network throughput and maintenance needs.
Innovation Solution
A method that uses a minimal number of measured data points to generate Transmit Power Calibration Tables, allowing wireless transmitters to self-calibrate by establishing correlations between frequency, measured power, and detector values, eliminating the need for iterative host device interactions and enabling field re-calibration based on signal strength changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional iterative calibration methods are used to determine detector values for each radio, then calibration accuracy is achieved, but manufacturing time and cost increase significantly
Solution Approach 1:
The patent pre-calculates detector target values for all frequency and power level combinations during manufacturing and stores them in lookup tables. This preliminary action eliminates the need for time-consuming iterative calibration during radio production, significantly improving manufacturing throughput while maintaining calibration accuracy through pre-computed reference values.
Solution Approach 2:
The patent measures and determines detector values at selected frequency and power level points, then uses interpolation to calculate detector target values for all other frequency and power level combinations. This partial measurement approach, combined with mathematical interpolation, achieves full calibration coverage without requiring exhaustive iterative measurements at every operating point, thereby improving manufacturing efficiency.
2Measurement precision
If traditional calibration methods are used with host device iterations, then accurate detector target values are obtained, but the process becomes time-consuming and requires significant host device interaction
Solution Approach 1:
The patent enables the radio to autonomously determine its own detector target values by performing measurements and calculations internally, then storing the results in its own non-volatile memory. This self-service calibration approach eliminates the need for time-consuming host device iterations and manual intervention, significantly reducing calibration time while maintaining measurement precision through the radio's own measurement capabilities.
Solution Approach 2:
The patent performs all necessary calibration measurements and calculations in advance during manufacturing, storing the detector target values in lookup tables within the radio's non-volatile memory. This preliminary calibration action eliminates the need for repeated host device interactions during operation, reducing calibration time while ensuring accurate detector target values are available for all frequency and power level combinations.
3Manufacturing precision
If radios are calibrated during manufacturing with comprehensive power tables, then initial calibration accuracy is achieved, but the process increases manufacturing cost and time
Solution Approach 1:
The patent measures and determines detector values at a reduced set of selected frequency and power level points during manufacturing, then uses interpolation algorithms to calculate the remaining detector target values. This partial measurement approach, combined with mathematical computation, achieves comprehensive calibration coverage with fewer physical measurements, thereby reducing manufacturing complexity and cost while maintaining calibration accuracy.
Solution Approach 2:
The patent creates comprehensive Transmit Power Calibration Tables by combining a limited number of directly measured data points with interpolated calculated values. This copying approach, where measured points serve as references for generating complete calibration data through interpolation, reduces the number of required manufacturing measurements and associated costs while maintaining calibration accuracy across all operating conditions.
4Reliability
If site surveys and manual adjustments are performed for power changes over time, then network performance is maintained, but maintenance cost and complexity increase for difficult-to-reach locations
Solution Approach 1:
The patent implements a feedback mechanism where the radio continuously monitors its own transmit power using an internal power detector, comparing measured values against stored detector target values from the calibration tables. When deviations are detected, the radio automatically adjusts its output power by modifying gain stage settings, maintaining network performance without requiring manual site surveys or physical access to difficult-to-reach locations.
Solution Approach 2:
The patent enables radios to autonomously detect and correct their own transmit power deviations over time by monitoring their performance and automatically adjusting their output power based on stored calibration data. This self-service capability eliminates the need for manual maintenance interventions in difficult-to-reach locations, reducing maintenance complexity and cost while ensuring continuous network reliability.
Data Source
AI summary
A small number of transmissions are performed at a sufficient number of frequencies and power levels so that a correlation between frequency, measured power, and detector values is established. Once a correlation is established, the wireless transmitter employs the measured data and calculates target detector values for all supported frequencies and at all supported power levels, eliminating the need for one frequency and one power level at a time iterations with a host device. Using the calculated target detector values and closed loop transmissions, the radio self-calibrates. Once employed in the field, the wireless transmitter can utilize measured changes in signal strength to determine when to re-calibrate, and using measured values from other network components, can employ the methodology of the present invention to self-calibrate, eliminating the need for field re-calibrations.