Time Twisted Wave Radio Filter Segmentation
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Solution Overview
Problem
The use of time twisted waves in radio communications introduces complexity due to the need for filters at transmission and reception, which can lead to inter-frame interference and compatibility issues with existing communication standards, especially when using Gaussian filters for both main and higher order modes.
Innovation Solution
The implementation of different filters for main mode and higher order modes (HOMs) at the transmission side, with the same filter used for both at the reception side, allows for reduced bandwidth and optimized filtering characteristics, enabling conventional filter shapes for the main mode and optimized shapes for HOMs, while minimizing residual interference between adjacent channels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the same Gaussian filter is used for both main mode and higher order modes (HOMs) at transmission and reception, then filtering is simplified, but inter-frame interference increases and compatibility with existing standards deteriorates
Solution Approach 1:
The patent divides the filtering process into separate filters for main mode and higher order modes. At the transmission side, a first filter is applied to main mode signals and a second filter is applied to HOMs. This segmentation allows each filter to be optimized for its specific mode, reducing inter-frame interference while maintaining manageable complexity.
Solution Approach 2:
The patent applies different filtering characteristics to different signal components. The first filter for main mode uses conventional filter shapes (e.g., square root raised cosine) for compatibility, while the second filter for HOMs uses optimized shapes to minimize interference. This local differentiation resolves the contradiction between simplicity and performance.
2Quantity of substance
If different filters are used for main mode and HOMs at transmission side, then bandwidth is reduced and interference is minimized, but device complexity increases
Solution Approach 1:
The patent merges the filtering operations into a unified transmission/reception framework where different filters are applied to different modes. By combining the first filter (for main mode) and second filter (for HOMs) into a single transmission system, the patent achieves bandwidth reduction and interference minimization while managing complexity through systematic integration.
Solution Approach 2:
The patent changes the filtering parameters (filter shapes, cutoff frequencies, roll-off factors) to optimize bandwidth usage. The first filter uses conventional parameters for compatibility, while the second filter uses optimized parameters specific to HOMs. This parameter differentiation reduces overall bandwidth requirements while the systematic management of these parameters keeps device complexity acceptable.
3Adaptability or versatility
If conventional filter shapes are used for main mode, then compatibility with existing standards is improved, but optimization for HOMs is reduced
Solution Approach 1:
The patent segments the filtering approach by applying conventional filter shapes (e.g., square root raised cosine) specifically to main mode signals for compatibility, while applying optimized filter shapes to HOMs for performance. This segmentation allows each mode to receive appropriate filtering without compromising the other.
Solution Approach 2:
The patent applies different quality levels of filtering to different modes: conventional, well-tested filter shapes for main mode to ensure compatibility, and optimized, customized filter shapes for HOMs to maximize performance. This local quality differentiation resolves the contradiction between compatibility and optimization.
4Object-generated harmful factors
If optimized filter shapes are used for HOMs, then interference between adjacent channels is reduced, but implementation complexity increases
Solution Approach 1:
The patent optimizes filter parameters (cutoff frequencies, roll-off factors, filter orders) specifically for HOMs to minimize interference between adjacent channels. By carefully tuning these parameters, the patent reduces channel interference while managing implementation complexity through systematic parameter optimization rather than complex filter structures.
Solution Approach 2:
The patent uses the well-established conventional filter design for main mode as a template or reference, then adapts and optimizes similar filter structures for HOMs. This copying approach allows optimized HOMs filtering to be implemented using proven design methodologies, reducing the complexity burden of novel filter designs.
Data Source
Figure 1
Figure 2a~2f
Figure 3a~3c
AI summary
Disclosed herein is radio communications method including carrying out, by a transmitter (11;21), transmission operations that comprise: generating first digital time signals related to a first Orbital Angular Momentum (OAM) mode with topological charge equal to zero, wherein each first digital time signal includes respective first time samples carrying corresponding first digital symbols to be transmitted; applying a first transmission filter (112a; 212a) to the first digital time signals, thereby obtaining filtered first digital time signals; generating second digital time signals related to one or more second OAM modes with topological charge different than zero, wherein each second digital time signal includes respective second time samples carrying one or more respective second digital symbols by means of a phase, or amplitude and phase, modulation related to a respective second OAM mode with topological charge different than zero; applying a second transmission filter (114a; 214a) to the second digital time signals, thereby obtaining filtered second digital time signals; combining the filtered first and second digital time signals into combined digital time signals, all having one and the same predefined time length; and transmitting a radio frequency signal carrying, in successive, non-overlapped time frames having the predefined time length, the combined digital time signals. The radio communications method further includes carrying out, by a receiver (12;22), reception operations that comprise: receiving the radio frequency signal transmitted by the transmitter (11;21); processing the received radio frequency signal so as to obtain a corresponding incoming digital signal; and processing said incoming digital signal so as to extract therefrom the first and second digital symbols carried thereby. The first transmission filter (112a;212a) and the second transmission filter (114a; 214a) have different filtering characteristics.