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Cross-Domain OTFS Detection via Delay-Doppler Decoupling: Reduced-Complexity Design and Performance Analysis.
Mengmeng Liu1, Shuangyang Li2, Baoming Bai1
1State Key Laboratory of ISN, Xidian University, Xi'an 710071, China.
Entropy (Basel, Switzerland)
|October 28, 2025
Summary
A new detection method for Orthogonal Time Frequency Space (OTFS) modulation reduces complexity by separating delay and Doppler effects. This approach achieves near-optimal error performance with significantly lower computational cost.
Area of Science:
- Wireless Communications
- Signal Processing
Background:
- Orthogonal Time Frequency Space (OTFS) modulation offers advantages in high-Doppler and delay spread channels.
- Existing detection methods for OTFS can be computationally intensive.
Purpose of the Study:
- To propose a reduced-complexity iterative detection scheme for OTFS modulation.
- To exploit channel properties in both time and delay-Doppler domains for efficiency.
Main Methods:
- Decoupling delay and Doppler effects in the time-domain effective channel.
- Applying a reduced-size linear minimum mean square error (LMMSE) filter.
- Utilizing cross-domain iteration and eigenvalue decomposition for complexity reduction.
Main Results:
- The proposed method effectively eliminates delay effects and minimizes Doppler effects.
- Computational complexity is made independent of the number of iterations.
- Negligible estimation bias is observed in both time and delay-Doppler domains.
Conclusions:
- The proposed reduced-complexity detection scheme achieves near-optimal error performance.
- Significant reduction in computational complexity is demonstrated compared to optimal detection.
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