Array Antenna Propagation Channel Characterization for Secure Radio Transmission
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Solution Overview
Problem
In broadband radio communication, the characteristics of propagation paths and antennas are not effectively utilized for secure transmission, as existing methods rely on controlling propagation parameters within a specific frequency band, which limits security and efficiency.
Innovation Solution
A transmitting apparatus with an array antenna and propagation channel estimation means generates channel estimate values for complex propagation channels, allowing secure transmission by correlating signals across multiple antennas and sub-carriers, and utilizing different directional patterns and polarization to enhance security and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If propagation parameters are controlled within a particular frequency band, then security is improved, but the utilization of propagation path and antenna characteristics is insufficient
Solution Approach 1:
The patent segments the broadband frequency band into multiple sub-bands or frequency ranges, and controls propagation parameters independently in each segment. This allows effective utilization of propagation and antenna characteristics in each frequency segment while maintaining overall security across the broadband communication system.
Solution Approach 2:
The patent applies different propagation parameter control strategies to different frequency bands based on their specific characteristics. By tailoring the control approach to local frequency band properties rather than applying a uniform control method across the entire broadband, the system effectively utilizes propagation path and antenna characteristics while maintaining security.
2Reliability
If multiple antennas are used to control propagation parameters, then security is improved, but device complexity increases
Solution Approach 1:
The patent designs the array antenna system to serve multiple functions simultaneously: it controls propagation parameters for security, enables signal reception from multiple directions, and provides spatial diversity. By making the antenna system multi-functional, the patent achieves enhanced security without proportionally increasing device complexity.
Solution Approach 2:
The patent controls propagation parameters by changing antenna configuration parameters such as element spacing, orientation, and excitation patterns. By adjusting these parameters dynamically, the system achieves secure communication without requiring complex additional hardware components.
Data Source
AI summary
A radio communication method for transmitting data to radio stations, wherein propagation parameters to be estimated in a receiving station are controlled, based on the data transmitting, by an array antenna comprising a plurality of antenna elements to perform data transmitting in a transmitting station. This allows channels characterized by the propagation parameters to be shared only by particular radio stations, and signals are superimposed on the propagation parameters, thereby realizing radio access in which a high security is retained.