OTFS Multi-Carrier Scheduling for Delay-Doppler Interference Resilience
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Solution Overview
Problem
Existing wireless communication technologies, particularly in 5G and beyond, face limitations in managing doubly dispersive channels due to inter-symbol and inter-carrier interference, with existing solutions focusing on single-domain diversity rather than multi-user diversity in the delay-Doppler domain, which is crucial for applications like NR-Lite, mMTC, eMBB, URLLC, and SURLLC.
Innovation Solution
A novel scheduling algorithm for OTFS-based multi-user communication that exploits multi-user diversity in the delay-Doppler domain by prioritizing users with the maximum number of channel taps, employing ISFFT, Heisenberg transform, and SFFT operations to enhance error performance and reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If OFDM-based or TDM-based wireless technologies are used, then time and frequency selectivity resilience is achieved, but inter-symbol interference and inter-carrier interference occur in doubly dispersive channels
Solution Approach 1:
The patent transitions from conventional single-domain (time or frequency) multiplexing to a two-dimensional delay-Doppler domain approach using OTFS signaling. This dimensional change allows the system to handle doubly dispersive channels by spreading signals across both delay and Doppler dimensions, thereby mitigating both inter-symbol interference and inter-carrier interference simultaneously while maintaining time and frequency selectivity resilience
2Object-generated harmful factors
If existing single-domain diversity techniques are used, then interference mitigation is achieved, but multi-user diversity exploitation in delay-Doppler domain is not utilized
Solution Approach 1:
The patent extends single-domain diversity techniques to the two-dimensional delay-Doppler domain by implementing multi-user scheduling that exploits channel diversity across both delay and Doppler dimensions. This allows the system to simultaneously mitigate interference and adaptively select users based on their channel conditions in the delay-Doppler domain, enhancing overall system performance
Solution Approach 2:
The patent implements dynamic multi-user scheduling that adapts to changing channel conditions in the delay-Doppler domain. The system continuously monitors and exploits multi-user diversity by dynamically allocating resources to users with favorable channel conditions, thereby achieving both interference mitigation and adaptive user selection
Data Source
AI summary
Disclosed is a multicarrier (MC) connection design via an intelligent exploitation of the multi-user diversity in delay-Doppler domain. Overall, the technology can play a key role as an enabler technology toward 5G and beyond communications systems with applications of NR-Lite, mMTC, eMBB, URLLC and SURLLC.