Polarized Antenna Alignment in Wireless AV MIMO Systems
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Solution Overview
Problem
In wireless AV systems, ensuring optimal MIMO performance requires alignment of polarization between data transmitting and receiving devices, which is challenging due to the need for precise alignment of dual polarization antennas, especially when reciprocity is not satisfied, leading to potential interference and reduced performance.
Innovation Solution
A data transmitting and receiving device method that uses multiple dual polarization antennas, transmitting and receiving training fields based on orthogonal sequences within specific frames, such as beacon frames, sector sweep frames, and beam refinement protocol packets, to perform polarization alignment, allowing for optional alignment based on reciprocity and independent alignment per directional multi-gigabit antenna.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If polarization alignment is performed between data transmitting and receiving devices, then MIMO performance is improved, but device complexity increases due to the need for precise alignment of dual polarization antennas
Solution Approach 1:
The patent performs polarization alignment during the beamforming training phase, which occurs before actual data transmission. Training fields are transmitted with known polarization states, allowing the receiving device to measure and determine the polarization relationship in advance. This preliminary alignment action eliminates the need for complex real-time alignment during data transmission, thus improving MIMO performance while managing device complexity.
Solution Approach 2:
The patent implements a feedback mechanism where the receiving device measures the polarization state of received training fields and communicates this information back to the transmitting device. Based on this feedback, the transmitting device adjusts its antenna polarization configuration to achieve optimal alignment. This closed-loop feedback approach enables precise polarization alignment without requiring overly complex manual configuration.
2Productivity
If multiple dual polarization antennas are used for MIMO transmission, then data transmission capacity is improved, but interference between antennas increases when polarization is not aligned
Solution Approach 1:
The patent changes the polarization state parameter of the antennas to achieve orthogonality. By adjusting the polarization angles of multiple antennas to be orthogonal (e.g., 0度和90度, or left-hand and right-hand circular polarization), the system enables simultaneous MIMO transmission while minimizing inter-stream interference. This parameter optimization allows multiple antennas to work together efficiently, increasing data transmission capacity without significant interference.
Solution Approach 2:
The patent applies different polarization characteristics to different antennas in the MIMO system. Each antenna is configured with specific polarization properties tailored to its role and position, creating local optimization of the electromagnetic field distribution. This local quality differentiation ensures that signals from different antennas remain distinguishable and minimizes mutual interference, thereby maintaining high data transmission capacity.
3Reliability
If polarization alignment is performed for both downlink and uplink, then communication reliability is improved, but transmission time increases
Solution Approach 1:
The patent performs polarization alignment during the initial beamforming training phase, which establishes the polarization relationship before actual communication begins. By completing the alignment action in advance, the system avoids the need for repeated alignment procedures during downlink and uplink transmissions, thus maintaining high communication reliability while minimizing the time lost to alignment operations.
Solution Approach 2:
The patent makes the polarization alignment results applicable to both downlink and uplink communications. The alignment information obtained during training is reused for both transmission directions, making the alignment process multi-functional. This universal application of alignment results improves communication reliability for both directions while avoiding the time cost of performing separate alignment procedures for each direction.
Data Source
AI summary
The present disclosure relates to a data transmission apparatus and method using a polarized antenna in a wireless AV system, and a data reception apparatus and method. The present specification provides a method for performing polarization alignment for a downlink on the basis of reciprocity, a method for performing polarization alignment for an uplink, and a method for performing polarization alignment independently for each DMG antenna when one data transmission apparatus or one data reception apparatus uses multiple DMG antennas. Optimal MIMO performance can be guaranteed by aligning polarization between multiple antennas of the data transmission apparatus and the data reception apparatus in the wireless AV system, the polarization alignment for a downlink or an uplink may be selectively performed on the basis of reciprocity, and polarization distortion can be reduced through the independent polarization alignment between each DMG antenna.