OTFS Modulation Parameter Configuration for High-Mobility Channels
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Solution Overview
Problem
High-mobility scenarios in wireless communication systems, such as high-speed railways and highways, experience significant declines in communication performance due to rapid changes in terminal speed, leading to time-varying fading, Doppler frequency shifts, and frequency offset issues.
Innovation Solution
Configuring orthogonal time frequency and space (OTFS) modulation parameters by a network device to convert doubly dispersive channels into approximately flat-fading channels in the delay-Doppler domain, ensuring reliable and accurate communication performance through two-dimensional transformations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional modulation schemes are used in high-mobility scenarios, then the system is simple to implement, but communication performance deteriorates due to rapid changes in terminal speed causing time-varying fading and Doppler frequency shifts
Solution Approach 1:
The patent transforms the modulation domain from time-frequency to delay-Doppler domain by changing the fundamental parameters of signal representation. This parameter transformation allows the system to handle high-mobility scenarios effectively by converting time-varying fading and Doppler shifts into manageable domain-specific characteristics, thereby improving communication performance without requiring overly complex adaptive mechanisms
Solution Approach 2:
The patent introduces a new dimensional perspective by operating in the delay-Doppler domain instead of the conventional time-frequency domain. This dimensional change enables the system to address high-mobility challenges by representing signals in a domain where rapid speed changes manifest as structured patterns rather than unpredictable variations, thus improving reliability while maintaining manageable complexity
2Reliability
If OTFS modulation is implemented to handle high-mobility scenarios, then communication performance improves through consistent fading in delay-Doppler domain, but the system complexity increases due to two-dimensional transformations
Solution Approach 1:
The patent applies preliminary transformations to convert signals into the delay-Doppler domain before transmission, preparing the signal structure in advance to withstand high-mobility conditions. This preliminary action ensures that when signals experience rapid speed changes, they maintain consistent fading characteristics because the transformation has already been performed, avoiding the need for complex real-time adaptations during transmission
Solution Approach 2:
The delay-Doppler domain serves as an intermediary representation between the transmitted signal and the received signal in high-mobility scenarios. By introducing this intermediate domain with specific transformation operations, the patent mediates the effects of rapid speed changes, converting potentially harmful time-varying characteristics into manageable domain-specific patterns that improve communication reliability
Data Source
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AI summary
The embodiments of the present disclosure are applicable to the technical field of communications. Disclosed are an OTFS modulation parameter configuration method and apparatus. The method executed by a network device comprises: determining relevant parameters of OTFS modulation; and sending to a terminal device the relevant parameters of the OTFS modulation. Thus, communication may be performed on the basis of relevant parameters of OTFS modulation, and the communication performance can be improved.