Dynamic OFDM OTFS Waveform Switching for High-Mobility Interference
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Solution Overview
Problem
Current wireless communication systems face challenges in co-existence and switching between orthogonal frequency division multiplexing (OFDM) and orthogonal time frequency space (OTFS) solutions, particularly in high-mobility scenarios with rich Doppler and delay environments, due to issues like inter-carrier interference and complex signal processing.
Innovation Solution
A method and apparatus that dynamically determine and switch between OFDM and OTFS transmission solutions based on real-time conditions, such as relative speed, number of paths, signal type, and delay, to optimize signal transmission in different domains, allowing for efficient communication by matching the radio environment and transmission conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If OFDM transmission solution is used in high-mobility scenarios with rich Doppler and delay environments, then communication compatibility is maintained, but inter-carrier interference increases and transmission reliability deteriorates
Solution Approach 1:
The patent implements dynamic waveform switching between OFDM and OTFS based on real-time channel conditions. The system determines whether to use OFDM or OTFS waveforms adaptively according to mobility parameters and channel characteristics, allowing the transmission solution to change dynamically rather than being fixed. This resolves the contradiction by enabling the system to maintain OFDM compatibility when appropriate while switching to OTFS when reliability is compromised by inter-carrier interference in high-mobility scenarios.
Solution Approach 2:
The patent changes the transmission parameter (waveform type) based on channel conditions. By monitoring mobility parameters, delay spread, and Doppler spread, the system selects between different waveform parameters (OFDM vs. OTFS). This parameter adaptation allows the system to maintain compatibility when using OFDM while switching to OTFS parameter when transmission reliability deteriorates due to inter-carrier interference, thus resolving the technical contradiction.
2Productivity
If OTFS transmission solution is used in high-speed scenarios, then transmission efficiency in Doppler and delay environments is improved, but system complexity increases and switching with OFDM becomes difficult
Solution Approach 1:
The patent segments the transmission system into distinct OFDM and OTFS modes that can be independently selected. Rather than attempting to combine both waveforms in a single complex system, the patent divides the transmission functionality into separate modules that can be activated based on conditions. This segmentation reduces overall system complexity by allowing the receiver to be optimized for one waveform at a time while maintaining the ability to switch between them, thus resolving the contradiction between improved transmission efficiency and reduced system complexity.
Solution Approach 2:
The patent creates a universal transmission framework that can handle both OFDM and OTFS waveforms through a common switching mechanism. The system design incorporates multi-functionality by enabling the same communication infrastructure to support different waveform types, allowing efficient transmission in Doppler and delay environments via OTFS while maintaining compatibility with standard OFDM systems. This universal approach reduces complexity compared to maintaining entirely separate systems for each waveform type.
3Adaptability or versatility
If waveform switching between OFDM and OTFS is implemented, then adaptability to different channel conditions is improved, but switching control complexity and detection difficulty increase
Solution Approach 1:
The patent performs preliminary determination of the appropriate waveform before actual transmission begins. The switching decision is made based on pre-measured channel parameters such as mobility, delay spread, and Doppler spread, rather than attempting to switch mid-transmission. This preliminary action simplifies the switching control by establishing the waveform selection criteria in advance, reducing the complexity of real-time switching detection and control while maintaining adaptability to different channel conditions.
Data Source
AI summary
A transmission method includes determining, by a communication device, a target transmission solution of a target signal. The target transmission solution is a first transmission solution or a second transmission solution, the first transmission solution is a transmission solution based on an OFDM communication system, and the second transmission solution is a transmission solution based on an OTFS communication system.