MIMO Antenna Polarization Switching for Signal Recovery
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Solution Overview
Problem
MIMO antennas face challenges in miniaturization and signal recovery due to changing channel environments and high correlation between receiver and transmitter, leading to difficulties in maintaining efficient data transmission and signal strength.
Innovation Solution
A MIMO antenna system with multiple antenna elements, a channel estimator, and a correlation comparator that adjusts signal reception based on calculated correlation and RSSI to optimize signal recovery, including switches and phase shifters to select appropriate polarized signals for improved reception.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the MIMO antenna uses a fixed linearly polarized antenna configuration, then the antenna structure is simple, but the signal reception efficiency deteriorates in multi-path environments where polarized waves change
Solution Approach 1:
The patent implements dynamic polarization switching capability in the MIMO antenna system. The receiver can switch between different polarized signals (e.g., vertical and horizontal linear polarization) based on channel conditions. This dynamic adaptation allows the system to maintain reliable signal reception in multi-path environments where the polarization of received signals may change, while keeping the antenna structure relatively simple through the use of switching mechanisms rather than complex multi-antenna arrays.
2Power
If the receiver near the transmitter receives a signal of high correlation, then the signal strength is strong, but the MIMO antenna cannot recover the signal due to high spatial correlation
Solution Approach 1:
The patent employs parameter changes in the form of polarization diversity. When signals from multiple antenna elements exhibit high spatial correlation (indicating poor MIMO performance), the system changes the polarization parameter of the received signals by switching to differently polarized antennas. This parameter change transforms highly correlated signals into less correlated signals, enabling effective signal recovery and maintaining MIMO system performance even when receivers are near transmitters.
Solution Approach 2:
The MIMO antenna system implements feedback mechanisms to monitor the correlation between signals received from different antenna elements. When high correlation is detected, the system uses this feedback information to trigger polarization switching, thereby adapting the reception strategy to maintain signal recovery capability. This closed-loop control ensures that the system responds appropriately to changing channel conditions.
3Volume of moving object
If the MIMO antenna uses smaller antenna elements for terminal miniaturization, then the terminal size is reduced, but the antenna elements become difficult to implement with conventional designs
Solution Approach 1:
The patent employs universally applicable small antenna elements that can be integrated into compact terminal devices. The antenna elements are designed with multi-functionality, serving both as radiation elements and as part of the polarization switching mechanism. This universal design approach enables the implementation of functional MIMO antenna elements in small terminals without requiring complex conventional antenna structures, thus achieving terminal miniaturization while maintaining MIMO capability.
Data Source
AI summary
A Multiple Input Multiple Output (MIMO) antenna system adaptable to an environmental multiplicity is provided. A MIMO antenna system includes a first antenna element, a second antenna element, a receiver for receiving at least one of different polarized signals through the first antenna element, a channel estimator for estimating a channel using a signal received via the receiver and a signal received via the second antenna element, and a correlation comparator for controlling the receiver to receive a specific polarized signal according to a correlation calculated from the estimated channel.