Multi-Antenna TER Power Control for Wireless Exposure Compliance
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Solution Overview
Problem
Electronic devices face a challenge in maintaining communication performance while adhering to Total Exposure Ratio (TER) value regulations, which limit electromagnetic radiation exposure to reduce harmful effects on the human body.
Innovation Solution
A wireless device with multiple antennas and a communication processor that calculates TER values using an influence matrix to optimize transmit power settings, considering the impact of each antenna's exposure on others, ensuring compliance with regulatory limits while minimizing performance degradation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If transmit power is reduced to satisfy TER value regulation conditions, then harmful electromagnetic wave exposure is reduced, but communication performance deteriorates
Solution Approach 1:
The patent applies local quality by calculating TER values separately for each antenna rather than treating all antennas uniformly. The communication processor computes individual TER values based on specific antenna usage patterns and power levels, allowing targeted power control for each antenna location. This enables precise local optimization of electromagnetic exposure while maintaining communication performance where possible.
Solution Approach 2:
The patent implements dynamics by dynamically adjusting transmit power based on real-time TER calculations. The system continuously monitors antenna usage patterns, calculates TER values for current and future windows, and adapts power settings accordingly. This dynamic approach allows the system to optimize power levels adaptively rather than using fixed reduction, balancing exposure reduction with performance maintenance.
2Reliability
If transmit power is reduced to satisfy TER value regulation conditions, then regulatory compliance is improved, but signal strength deteriorates
Solution Approach 1:
The patent applies preliminary action by calculating TER values in advance for future windows before actual transmission occurs. The system predicts antenna usage patterns and computes required power limits ahead of time, allowing proactive power setting that ensures compliance while optimizing signal strength. This advance calculation enables the system to prepare optimal power levels rather than reactively reducing power after violation detection.
Solution Approach 2:
The patent implements feedback by using calculated TER values and influence coefficients to adjust power settings for subsequent windows. The system continuously monitors actual antenna usage, compares it against calculated TER limits, and uses this feedback to refine power allocations. This closed-loop approach ensures regulatory compliance is maintained while minimizing unnecessary power reductions that would weaken signal strength.
3Reliability
If multiple antennas are used to improve communication performance, then signal reliability is improved, but total electromagnetic exposure increases
Solution Approach 1:
The patent applies parameter changes by using influence coefficients that quantify the electromagnetic exposure contribution of each antenna combination. The system calculates TER values based on these parameters, allowing it to identify which antenna configurations provide the best balance between signal reliability and exposure levels. By changing power parameters selectively for different antenna combinations, the system optimizes the trade-off between using multiple antennas for reliability and limiting total exposure.
Data Source
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AI summary
According to an aspect of the inventive concept, an electronic device includes a transmitter including a plurality of antennas, and a communication processor for calculating a total exposure ratio (TER) value of each of the plurality of antennas, wherein the communication processor includes an antenna index buffer for storing a used antenna index, which is an index of one or more used antennas from among the plurality of antennas used in each window, a used power buffer for storing used power of an antenna corresponding to the used antenna index, and a controller configured to calculate the TER value based on the used antenna index, the used power, and an influence matrix.