Multi-Antenna SAR Power Allocation for TER-Limited Communication
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Solution Overview
Problem
Existing electronic devices face a challenge in maintaining optimal communication performance while adhering to total exposure ratio (TER) regulatory conditions, as reducing transmission power to meet these conditions can degrade communication performance.
Innovation Solution
An electronic device with multiple antennas and a system to calculate residual specific absorption ratio (SAR) values based on used antenna indices and power consumption, using a correlation matrix to assign transmission power to each antenna, optimizing power distribution across antennas to meet TER regulations without significant performance loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If transmission power is reduced to meet TER value regulatory condition, then harmful effects of electromagnetic waves are reduced, but communication performance deteriorates
Solution Approach 1:
The patent applies local quality by calculating and controlling SAR values for individual antennas rather than uniformly reducing power across all antennas. The system determines which specific antennas exceed SAR limits and only restricts power for those particular antennas, allowing other antennas to maintain optimal transmission power and thus preserving overall communication performance while still meeting regulatory requirements.
Solution Approach 2:
The patent segments the total transmission power control into individual antenna-level control. Instead of treating the antenna system as a single unit, the system evaluates each antenna's SAR contribution separately using a correlation matrix, and applies power restrictions only to specific antennas that violate SAR limits. This segmentation enables selective power management that maintains communication performance where possible.
2Productivity
If transmission power is increased to improve communication performance, then communication efficiency is enhanced, but TER value regulatory condition may be violated
Solution Approach 1:
The patent implements dynamic power control by continuously monitoring SAR values for each antenna and adjusting transmission power in real-time based on current operating conditions. The system can increase power for antennas that are within SAR limits while dynamically restricting power for antennas that would violate SAR thresholds, allowing the device to operate at maximum permissible power levels without violating regulatory conditions.
Solution Approach 2:
The patent changes the power parameter selectively for individual antennas based on their SAR characteristics. Rather than applying a uniform power reduction, the system modifies transmission power parameters only for specific antennas that would cause SAR violations, allowing other antennas to maintain higher power levels for improved communication efficiency while still meeting overall TER regulatory requirements.
3Object-affected harmful factors
If uniform power reduction is applied to all antennas to meet SAR limits, then TER regulatory condition is satisfied, but overall communication performance is significantly degraded
Solution Approach 1:
The patent applies local quality by implementing differential power control across individual antennas based on their specific SAR contributions. The system calculates SAR values for each antenna separately and applies power restrictions only to those antennas that would violate SAR limits, rather than uniformly reducing power across the entire antenna system. This localized approach maintains communication performance for antennas that are within acceptable SAR ranges.
Solution Approach 2:
The patent implements selective parameter changes by modifying transmission power parameters only for specific antennas that exceed SAR thresholds. The system uses a correlation matrix to determine the SAR contribution of each antenna and adjusts power parameters accordingly, leaving power parameters unchanged for antennas that are already within SAR limits, thus avoiding unnecessary performance degradation.
Data Source
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AI summary
An electronic device includes a plurality of antennas, an antenna index buffer configured to store a used antenna index indicating at least one antenna among the plurality of antennas used in each of a plurality of windows, a used power buffer configured to store power consumption of an antenna corresponding to the used antenna index, and processing circuitry configured to calculate a residual specific absorption ratio (SAR) value of each of the plurality of antennas based on the used antenna index, the power consumption and a correlation matrix, and assign transmission power to each of transmitting antennas based on the residual SAR and an operation mode, the transmitting antennas being among the plurality of antennas.