MIMO Antenna Array Polarization Optimization
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Solution Overview
Problem
MIMO wireless transmission in millimeter wave ranges faces suboptimal reception due to polarization degradation caused by channel misalignments and multipath propagation, as existing antenna array arrangements radiate equal signals in orthogonal planes without adaptive configuration.
Innovation Solution
A method involving a network node that transmits pilot symbols associated with distinct states of polarization and receives feedback to configure its antenna array, optimizing polarization states for improved reception by determining the set state of polarization based on coupling coefficients or throughput rates, thereby enhancing signal quality and reducing functional complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If antenna elements radiate equal signals in orthogonal planes without adaptive configuration, then device complexity is reduced, but reception quality deteriorates due to polarization degradation from channel misalignments and multipath propagation
Solution Approach 1:
The patent implements dynamic polarization configuration by allowing the antenna array to adaptively adjust its polarization states based on channel conditions. The system transitions from static equal-signal radiation to dynamic polarization optimization, where the antenna configuration changes in response to feedback about channel misalignments and multipath propagation characteristics, thereby improving reception quality without permanent complexity increase
Solution Approach 2:
The patent employs feedback mechanisms where the receiving network node provides information about channel conditions, polarization alignment, and reception quality to the transmitting network node. This feedback enables the transmitting antenna array to adjust its polarization configuration optimally, resolving the contradiction by using feedback-driven adaptation to maintain high reception quality while managing system complexity through intelligent control
2Measurement precision
If pilot symbols are transmitted for each distinct state of polarization to optimize reception, then measurement precision of polarization states is improved, but signaling traffic increases
Solution Approach 1:
The patent applies partial action by transmitting pilot symbols selectively rather than exhaustively for all possible polarization states. The system determines the necessary number and types of pilot symbols based on the specific service requirements, channel conditions, and polarization complexity, thereby achieving sufficient measurement precision for polarization state detection while minimizing signaling overhead through optimized pilot selection
Data Source
AI summary
Methods (50, 60) are provided for operating first and second network nodes (80, 90) of a wireless network which participate (51, 61) in a multiple input multiple output, MIMO, wireless transmission. The network nodes (80, 90) respectively comprise an antenna array (20, 30, 91) having antenna elements (11, 12) being associated with respective ones of two mutually orthogonal planes of polarization. The respective method (50, 60) comprises: communicating (54, 64), by the first network node (80) and to the second network node (90), a sequence of pilot symbols, each of which is associated with one of a set of mutually distinct states of polarization for transmission of the respective pilot symbol; and communicating (55, 65), by the second network node (90) and to the first network node (80), at least one feedback signal associated with the pilot symbols. The at least one feedback signal is indicative of a set state of polarization. The method (50) for operating the first network node (80) further comprises: configuring (56) the antenna array (20, 30) according to the set state of polarization.