Wireless Device Adaptive Array Antenna Null Pattern
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Solution Overview
Problem
Conventional millimeter wave wireless communication systems face disconnection issues when obstacles move into the propagation path, and existing methods to address frequency-selective fading and redundancy limitations in adaptive array antennas are inadequate, leading to simultaneous communication path failures.
Innovation Solution
A wireless communication device and method that form and utilize multiple directivity response patterns, including a first pattern with a main lobe in a specific direction and a second pattern with a null value in that direction, allowing communication through multiple spatial paths and ensuring continued connectivity even if one path is interrupted.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a directivity response pattern with high side lobe level in direct wave direction is selected to receive reflected waves, then communication redundancy is improved, but communication reliability deteriorates because both communication paths can be simultaneously cut off when obstacles move into the direct wave direction
Solution Approach 1:
The patent inverts the conventional approach by forming a null value (minimum) in the direct wave direction instead of a main lobe (maximum). The second directivity response pattern is designed with a null value in the direction of the main lobe of the first pattern, which receives direct waves. This inversion ensures that the second pattern receives only reflected waves and not direct waves, preventing simultaneous path failure while maintaining communication redundancy.
Solution Approach 2:
The patent applies local quality by creating distinct directional characteristics in different parts of the radiation pattern. The first directivity response pattern has a main lobe in a specific direction for receiving direct waves, while the second pattern has a null value in that same direction and a main lobe in a different direction for receiving reflected waves. This localized differentiation ensures that each pattern serves a specific communication path function.
2Reliability
If multiple directivity response patterns are formed and switched for millimeter wave communication, then communication reliability is improved by providing alternative paths, but device complexity increases due to adaptive array antenna control requirements
Solution Approach 1:
The patent applies preliminary action by pre-forming multiple directivity response patterns with predetermined directional characteristics before communication occurs. The first pattern is configured with a main lobe in the direct wave direction, and the second pattern is configured with a null value in that direction and a main lobe in the reflected wave direction. These patterns are prepared in advance and can be switched based on communication conditions, reducing real-time control complexity.
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 approach enhances communication reliability by maintaining connectivity through multiple paths, reducing the likelihood of simultaneous path failures and improving communication quality by selecting optimal directivity response patterns based on signal reception states.
Implementation Method 1
a wireless receiver 120 equipped with an adaptive array antenna... switching the directivity response pattern... form a second directivity response pattern having a null value in the direction of a main lobe of a first directivity response pattern
Data Source
AI summary
A wireless communication device forms a second directivity response pattern having a null value in the direction of a main lobe of a first directivity response pattern, and communicates with a communication partner device by using the first directivity response pattern and the second directivity response pattern.