Cross Polarization Antenna Array for MIMO Channel Correlation Reduction
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Solution Overview
Problem
The existing MIMO+BF technology is hindered by strong channel relevancy between antennas, which affects overall performance and demodulation in MIMO A and MIMO B transmission formats.
Innovation Solution
Forming a cross polarization antenna array at the base station, calculating a weighted matrix based on channel information, and performing weighted processing on data streams to enhance irrelevancy between antennas, thereby improving demodulation performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a vertical polarization antenna array is adopted for MIMO+BF transmission, then the structure is simple and easy to implement, but the channel relevancy between antennas becomes strong which degrades demodulation performance
Solution Approach 1:
The patent applies asymmetry by transitioning from a symmetric vertical polarization antenna array to an asymmetric cross-polarization antenna array configuration. This asymmetric structure creates different polarization states between antennas, reducing channel correlation and improving demodulation performance while maintaining implementation feasibility
Solution Approach 2:
The patent changes the polarization parameter of the antenna array from vertical polarization to cross-polarization. This parameter change fundamentally alters the channel characteristics between antennas, reducing channel relevancy and enhancing the reliability of MIMO+BF transmission
2Reliability
If cross polarization antenna array is adopted to reduce channel relevancy, then demodulation performance is improved, but the device complexity increases
Solution Approach 1:
The patent segments the antenna array into distinct polarization groups (vertical and horizontal polarization antennas). This segmentation allows independent optimization of each polarization channel while reducing inter-antenna correlation, achieving improved demodulation performance with manageable complexity through modular architecture
Data Source
AI summary
Embodiments of the present disclosure provide a data transmission method and an apparatus. The method mainly includes: forming multiple antennas of a BS (base station) into a cross polarization antenna array, and calculating a weighted matrix of a to-be-transmitted data stream of the BS according to channel information between the BS and an MS (mobile station); performing weighted processing on the to-be-transmitted data stream of the BS according to the weighted matrix, and sending a data stream that has undergone the weighted processing from the BS to the MS. The embodiments of the present disclosure may enhance the demodulation performance because the cross polarization antenna array is adopted at the BS, and certain irrelevancy exists between cross antennas; therefore, the embodiments of the present disclosure may significantly enhance the overall performance of sending the data stream from a BS side to an MS side.