GI-Based OTFS Waveform for High-Mobility Interference Mitigation
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Solution Overview
Problem
Existing wireless communication technologies face challenges in high-mobility scenarios due to inter-symbol interference and inter-carrier interference caused by high residual frequency offset and large Doppler spread, leading to decreased channel estimation accuracy and increased retransmissions.
Innovation Solution
Implementing a guard interval (GI)-based orthogonal time frequency space (OTFS) waveform with defined sequences in the time domain to mitigate inter-symbol interference and improve communication robustness in high-mobility environments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional wireless communication technologies are used, then basic communication functionality is provided, but inter-symbol interference and inter-carrier interference occur due to high residual frequency offset and large Doppler spread in high-mobility scenarios
Solution Approach 1:
The patent changes the waveform parameters by transitioning from conventional OFDM to GI-based OTFS waveform, modifying the time-frequency structure to incorporate guard intervals and orthogonal time-frequency space coding. This parameter change enables the system to maintain orthogonality and reduce interference in high-mobility scenarios where conventional parameters fail.
Solution Approach 2:
The guard interval acts as an intermediary element between adjacent symbols in the time domain, providing a buffer that prevents inter-symbol interference. The OTFS transformation serves as an intermediary that maps data to orthogonal time-frequency atoms, separating the harmful frequency offset and Doppler effects from the data transmission.
2Reliability
If guard interval-based OTFS waveform is implemented, then inter-symbol interference is mitigated and communication robustness is improved, but device complexity increases due to additional processing requirements
Solution Approach 1:
The patent replaces the conventional OFDM mechanical processing system with an OTFS-based system that operates in the time-frequency domain. This substitution transforms the interference mitigation approach from time-domain cyclic prefixes to orthogonal time-frequency atom decomposition, which handles high-mobility scenarios more effectively while managing processing complexity through mathematical transformation rather than additional hardware complexity.
3Reliability
If conventional OFDM with cyclic prefix is used, then basic interference protection is provided, but spectral efficiency decreases and peak-to-average power ratio increases in high-mobility environments
Solution Approach 1:
The patent transitions from one-dimensional time-domain cyclic prefix protection to two-dimensional time-frequency domain OTFS protection. By orthogonalizing the time-frequency atoms and using guard intervals in the time domain while maintaining frequency orthogonality, the system achieves interference protection without the spectral efficiency penalties and high peak-to-average power ratio associated with conventional OFDM in high-mobility scenarios.
Data Source
AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a transmitter network node may generate a guard interval (GI)-based orthogonal time frequency space (OTFS) waveform comprising at least one defined sequence associated with at least one GI in a time domain corresponding to the GI-based OTFS waveform. The transmitter network node may transmit at least one signal based on the GI-based OTFS waveform. Numerous other aspects are described.