OAM Modulation via Antenna Array Mode Selection
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Solution Overview
Problem
Existing technologies for wireless communication using electromagnetic waves with Orbital Angular Momentum (OAM) are limited to multiplexing signals and do not support modulation and demodulation using OAM propagation modes.
Innovation Solution
A transmission and reception system utilizing a 2 × 2 array antenna with a modulator and demodulator that selects and processes signals across four OAM propagation modes (0-order, 1-order, -1-order, and 2-order) for modulation and demodulation, allowing for communication using these modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If electromagnetic waves with OAM propagation modes are used for multiplexing only, then signal transmission capacity is improved, but modulation and demodulation functionality is lost
Solution Approach 1:
The patent applies multi-functionality by enabling the OAM propagation modes to serve dual purposes: both multiplexing signals and performing modulation/demodulation operations. The system configures multiple transmission antennas to emit electromagnetic waves with different OAM modes that can simultaneously carry multiplexed signals and encode modulation information, while reception antennas receive and demodulate these signals using corresponding OAM modes.
Solution Approach 2:
The patent utilizes parameter changes by varying the OAM mode parameters (different propagation modes) to achieve both multiplexing and modulation functions. By changing the OAM mode parameters across different antennas and signal layers, the system enables flexible signal encoding and transmission, allowing the same physical medium to support multiple functional requirements.
2Productivity
If multiple OAM propagation modes are used for multiplexing, then channel capacity is improved, but error reduction capability is insufficient
Solution Approach 1:
The patent implements feedback mechanisms in the modulation and demodulation process using OAM propagation modes. The reception device demodulates received signals using corresponding OAM modes and can provide feedback information about signal quality and error conditions, enabling the transmission system to adjust and reduce errors while maintaining high channel capacity through multiple OAM modes.
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
Enables efficient modulation and demodulation of signals using OAM propagation modes, reducing errors and allowing for multi-value modulation, while maintaining confidentiality through the use of diffusion patterns.
Implementation Method 1
electromagnetic waves, which have Orbital Angular Momentum (OAM)... a plurality of modes (hereinafter, described as OAM propagation modes) exist based on difference in phase variations with respect to an azimuth angle
Data Source
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AI summary
To perform modulation/demodulation by selecting one or more Orbital Angular Momentum (OAM) propagation modes in a system which performs communication using wireless signals having a plurality of OAM propagation modes. Transmission device (10) includes: modulator (11) that selects one or more Orbital Angular Momentum (OAM) propagation modes among N (N is an integer equal to or greater than 2) OAM propagation modes in accordance with a value of bit data to be transmitted; and transmitter (12) that transmits a signal of the OAM propagation mode selected by modulator (11).