Vehicle Terminal Antenna Element Selection for Spatial Fading
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Solution Overview
Problem
Existing wireless communication systems for vehicles face challenges with spatial selectivity fading when the terminal apparatus moves, as they do not support switching antenna elements, leading to interference and reduced communication efficiency.
Innovation Solution
A terminal apparatus with a plurality of antenna elements arranged along its traveling direction, equipped with a region specification unit to acquire propagation environment information and select the optimal antenna element for communication, ensuring stable communication by maintaining the selected antenna element stationary on stationary coordinates as the vehicle moves.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single antenna element is used for communication in a moving vehicle, then the device complexity is reduced, but spatial selectivity fading occurs leading to reduced communication reliability
Solution Approach 1:
The antenna system is segmented into multiple antenna elements arranged along the traveling direction of the vehicle. Each antenna element can be independently selected based on propagation environment information, allowing the system to mitigate spatial selectivity fading by switching between segments rather than using a single antenna element.
Solution Approach 2:
The antenna element selection is made dynamic based on real-time propagation environment information. The system dynamically switches between antenna elements as the vehicle moves, selecting the optimal element for current communication conditions, thereby maintaining reliable communication without requiring a complex fixed-configuration antenna system.
2Productivity
If antenna elements are switched dynamically based on propagation environment information, then communication efficiency is improved, but the control complexity increases
Solution Approach 1:
Propagation environment information is acquired and analyzed in advance to determine optimal antenna element selection. By performing preliminary analysis of the communication environment, the system prepares selection decisions before actual communication occurs, improving efficiency without requiring complex real-time control during data transmission.
Solution Approach 2:
The system uses propagation environment information as feedback to adjust antenna element selection. This feedback mechanism allows the system to adapt to changing communication conditions and select the most appropriate antenna element, improving communication efficiency while keeping the control logic relatively simple through iterative optimization.
3Reliability
If multiple antenna elements are arranged along the traveling direction, then spatial selectivity fading is reduced, but the antenna structure becomes more complex
Solution Approach 1:
Different antenna elements are positioned at specific locations along the traveling direction of the vehicle, with each element optimized for its local spatial characteristics. This local quality approach allows the system to address spatial selectivity fading by selecting elements with appropriate radiation patterns for specific propagation conditions, rather than requiring a uniformly complex antenna structure.
Data Source
AI summary
A terminal apparatus mounted on a movable body is provided to communicate with an external communication apparatus outside the movable body. The terminal apparatus includes an antenna, and a communicator device. The antenna includes a plurality of antenna elements to be arranged along a traveling direction of the movable body. The communicator device is configured to communicate with the external communication apparatus using a communicating antenna element that is at least one of the plurality of antenna elements. The communicating antenna element is selected from the plurality of antenna elements so as to belong to a specified region. The specified region is defined by propagation environment information of an electric wave propagation path of a signal transmitted to and received from the external communication apparatus.