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Cross-Domain OTFS Detection via Delay-Doppler Decoupling: Reduced-Complexity Design and Performance Analysis.

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Summary
This summary is machine-generated.

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.

Keywords:
LMMSEOTFSgenie-aided strategyiterative detectiontreating interference as noise strategy

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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.