Transmit Polarization Adaptation Under Wireless Power Constraints
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Solution Overview
Problem
Current polarization-diversity approaches in wireless communication often result in suboptimal performance due to static or predefined polarizations that fail to adapt to changing environments and user orientations, leading to significant fading and reduced communication performance.
Innovation Solution
Electronic devices dynamically adjust transmit and receive polarization states and antenna patterns based on feedback, such as channel frequency response and error vector magnitude, to optimize communication performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If static or predefined polarization is used in transmit antennas, then device complexity is reduced and ease of operation is improved, but communication performance deteriorates due to fading and mismatch with client orientation
Solution Approach 1:
The patent applies dynamics by transitioning from static predefined polarization to dynamic polarization selection. The access point determines client orientation and selectively applies polarization transformations (e.g., rotating horizontal polarization to vertical) based on real-time client orientation detection, ensuring optimal signal reception while maintaining operational simplicity.
Solution Approach 2:
The patent changes the polarization parameter dynamically based on client orientation. By detecting the client's orientation and adjusting the transmit polarization accordingly (e.g., applying a 90-degree rotation when client orientation differs by 90 degrees), the system optimizes communication performance without increasing operational complexity for the user.
2Reliability
If polarization diversity with multiple antennas is used, then communication performance is improved through reduced fading, but device complexity increases due to additional antennas and spatial offset requirements
Solution Approach 1:
The patent makes existing antennas multi-functional by enabling them to transmit with different polarizations dynamically. Instead of requiring separate dedicated antennas for each polarization, the system can configure existing antennas to provide both horizontal and vertical polarization as needed, reducing the number of physical antennas required while maintaining polarization diversity benefits.
Solution Approach 2:
The patent changes the polarization parameter of existing antennas dynamically based on client orientation and regulatory constraints. By transforming the polarization state of signals from existing antennas (e.g., rotating horizontal to vertical polarization), the system achieves polarization diversity without adding physical antennas, thereby reducing device complexity while maintaining communication performance.
3Reliability
If dynamic polarization adjustment is implemented, then communication performance is improved by adapting to client orientation, but device complexity increases due to feedback processing and antenna selection mechanisms
Solution Approach 1:
The patent implements feedback by receiving client orientation information from the client device and using it to determine the appropriate polarization transformation. The access point processes this feedback to select the optimal polarization state, applying transformations such as 0-degree, 90-degree, or other rotations based on the detected orientation difference, thereby optimizing communication performance through adaptive polarization adjustment.
Solution Approach 2:
The patent dynamically changes the polarization parameter based on feedback about client orientation. By detecting the orientation difference between access point and client antennas and applying appropriate polarization transformations (e.g., rotating horizontal to vertical when orientations differ by 90 degrees), the system optimizes signal reception without requiring complex additional hardware.
4Reliability
If regulatory constraints on transmit power are applied, then compliance with FCC rules is ensured, but communication performance deteriorates due to reduced transmit power available for transmission
Solution Approach 1:
The patent changes the polarization parameter to comply with regulatory constraints. When the detected client orientation indicates that the default polarization would exceed FCC power limits, the system transforms the polarization (e.g., rotating horizontal to vertical) to allow operation within regulatory limits while maintaining optimal communication performance through the transformed polarization state.
Data Source
AI summary
An electronic device that dynamically adjusts a number of antennas used during transmitting and/or a transmit polarization state is described. This electronic device may include: a first set of antennas; and a second set of antennas, where a given first antenna in the first set of antennas has a first predefined polarization and a given second antenna in the second set of antennas has a second predefined polarization. During operation, the electronic device may dynamically adjust, based at least in part on a transmit power and a regulatory constraint: the number of antennas in the first set of antennas and the second set of antennas used during transmitting; and/or the transmit polarization state by selecting antennas in the first set of antennas and the second set of antennas.