OAM Control Channel Transmission Stability
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Solution Overview
Problem
In OAM-based wireless communication systems, ensuring stable transmission of control channels is challenging due to axial deflection angles between transceivers, leading to increased bit error rates and decreased system performance.
Innovation Solution
The method involves determining and transmitting control channels using OAM modes with smaller absolute eigenvalues, such as l=−1, l=0, and l=1, to improve stability and robustness, with terminal and network devices coordinating through protocols and signaling to select optimal OAM modes for transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If OAM modes with larger absolute eigenvalues are used for control channel transmission, then spectrum utilization can be improved, but transmission stability deteriorates due to axial deflection angles between transceivers
Solution Approach 1:
The patent changes the parameter of OAM mode selection by restricting the eigenvalue range to [-1, 0, 1] for control channel transmission. This parameter change prioritizes transmission stability over maximum spectrum utilization, as these low eigenvalue modes are less sensitive to axial deflection angles between transceivers, thereby reducing mode crosstalk and bit error rates.
2Productivity
If OAM modes are used for control channel transmission, then communication capacity can be increased, but bit error rate increases due to mode crosstalk caused by axial deflection
Solution Approach 1:
The patent applies local quality by differentiating the treatment of control channels versus data channels. Control channels use OAM modes with eigenvalues in [-1, 0, 1] to minimize bit error rates, while data channels can utilize higher eigenvalue modes for maximum capacity. This localized optimization ensures reliable control signaling without sacrificing overall system capacity.
3Productivity
If multiple OAM modes are used for different channels, then spectrum efficiency can be improved, but system complexity increases due to mode selection and coordination requirements
Solution Approach 1:
The patent segments the OAM mode selection into distinct categories: control channels use eigenvalues in [-1, 0, 1] while data channels use other available modes. This segmentation simplifies the system by providing clear, protocol-defined guidelines for mode selection, reducing the complexity of mode coordination between terminal and network devices.
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 the robustness and reliability of control channel transmission by leveraging the orthogonality of OAM modes, reducing bit error rates and maintaining high system performance.
Implementation Method 1
the concept of vortex electromagnetic waves is proposed and connected with an OAM. The OAM is independent of traditional modulation dimensions such as phase, frequency, and polarization, and is considered to be a new modulation dimension. Moreover, OAM modes carried by the vortex electromagnetic waves theoretically have an infinite number, and OAM beams with different integer eigenvalues are orthogonal to each other.
Data Source
AI summary
An orbital angular momentum (OAM)-based communication method, includes: obtaining, by a terminal device, a first OAM mode indicated by a network device; and transmitting, by the terminal device, a control channel according to the first OAM mode, after entering a connected state; wherein the first OAM mode includes at least one OAM mode of: an OAM mode with an eigenvalue of −1, an OAM mode with an eigenvalue of 0, or an OAM mode with an eigenvalue of 1.