Microwave MIMO Link Adaptation via Orthogonal Polarization Switching
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Solution Overview
Problem
MIMO technology in microwave communication is susceptible to atmospheric impacts such as rain fade and atmospheric inhomogeneity, leading to reduced system channel capacity and potential data transmission interruptions.
Innovation Solution
A microwave transmission method where the receive end receives 2N channels of signals through N first antennas, and when transmission performance of any one channel is less than a threshold, it switches to receiving two orthogonal channels from different second antennas, resuming 2N channels when performance improves.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If MIMO technology is used to improve data transmission efficiency, then system channel capacity is multiplied, but the system becomes susceptible to atmospheric impact causing link degradation and transmission interruption
Solution Approach 1:
The patent changes the transmission parameters by switching between MIMO mode (2N channels) and diversity mode (2 channels with orthogonal polarization) based on link quality. When atmospheric conditions cause degradation detected by the receive end, the system transitions to a more robust transmission mode with orthogonal polarization that is less susceptible to rain fade and atmospheric inhomogeneity, thus maintaining reliability while preserving productivity
2Reliability
If the receive end restarts the equalizer to recover from link degradation, then the data link recovers, but data transmission is interrupted during the restart process
Solution Approach 1:
The system prepares alternative transmission paths in advance by maintaining the capability to switch between MIMO and diversity modes. When link degradation is detected, the receive end triggers a mode switch to orthogonal polarization channels before the equalizer restart completes, ensuring continuous data transmission. This preliminary preparation of alternative paths prevents transmission interruption during recovery
Solution Approach 2:
The patent introduces an intermediary mechanism - the orthogonal polarization channel - that acts as a bridge during the transition from degraded MIMO mode. While the equalizer is restarting, data continues to flow through the orthogonal polarization channels, serving as a mediator that maintains transmission continuity during the recovery process
3Productivity
If 2N channels are used for high capacity transmission, then system channel capacity increases, but transmission performance degrades under atmospheric impact
Solution Approach 1:
The patent implements a dynamic transmission system that adapts its configuration based on real-time link quality. The system transitions from a static high-capacity MIMO configuration to a dynamic mode that switches between 2N channels and 2 orthogonal channels. This dynamics allows the system to optimize between capacity and atmospheric resistance, using full 2N channels when conditions are good and switching to robust orthogonal polarization when atmospheric impact occurs
Solution Approach 2:
The patent adds another dimension to the transmission system by introducing orthogonal polarization as a separate transmission dimension. Instead of only varying the number of channels, the system utilizes polarization diversity as an additional degree of freedom. This dimensional addition provides a new pathway for data transmission that is less affected by atmospheric conditions, complementing the spatial diversity of multiple antennas
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This method maintains uninterrupted data transmission even during link degradation and improves system channel capacity and data transmission efficiency by adapting to changing transmission performance.
Implementation Method 1
The receive end receives 2N channels of signals from a transmit end through N first antennas, where the 2N channels of signals are respectively from N second antennas of the transmit end
Implementation Method 2
When transmission performance of any one of the 2N channels of signals is less than a first threshold, the receive end receives, from two different second antennas, two channels of signals whose polarization directions are orthogonal
Data Source
AI summary
A method includes: The receive end receives 2N channels of signals through N first antennas, where the 2N channels of signals are respectively from N second antennas of the transmit end. When transmission performance of any one of the 2N channels of signals is less than a first threshold, the receive end respectively receives, from two second antennas, two channels of signals whose polarization directions are orthogonal. When transmission performance of the two channels of signals is both greater than a second threshold, the receive end receives the 2N channels of signals through the N first antennas.