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Progressive Inter-Path Interference Cancellation Algorithm for Channel Estimation Using Orthogonal Time-Frequency
Mauro Marchese1, Henk Wymeersch2, Paolo Spallaccini3
1Department of Electrical, Computer and Biomedical Engineering, University of Pavia, 27100 Pavia, Italy.
Sensors (Basel, Switzerland)
|July 13, 2024
Summary
This study introduces an improved channel estimation algorithm for orthogonal time-frequency space (OTFS) systems, significantly reducing complexity and enhancing accuracy by progressively canceling inter-path interference (IPI). The new method achieves superior performance in fractional delay-Doppler (DD) scenarios.
Area of Science:
- Wireless Communications
- Signal Processing
Background:
- Orthogonal Time-Frequency Space (OTFS) modulation offers advantages in high-Doppler environments.
- Fractional delay-Doppler (DD) channel estimation in OTFS is challenging due to inter-path interference (IPI).
Purpose of the Study:
- To develop a low-complexity and accurate channel estimation algorithm for fractional DD scenarios in OTFS systems.
- To reduce the computational complexity of existing IPI cancellation methods.
Main Methods:
- A novel variant of the delay-Doppler inter-path interference cancellation (DDIPIC) algorithm is proposed.
- The algorithm progressively cancels IPI during the estimation process.
- A final refinement step is incorporated to reduce overall complexity.
Main Results:
- The proposed algorithm demonstrates reduced computational complexity compared to the standard DDIPIC.
- Lower normalized mean square error (NMSE) is achieved.
- Improved bit error rate (BER) performance is observed.
Conclusions:
- The developed algorithm offers a more efficient approach to fractional DD channel estimation in OTFS.
- It effectively mitigates IPI while maintaining high accuracy.
- This advancement contributes to more robust and performant OTFS systems.
Keywords:
(DD) delay-Doppler domainOTFSchannel estimationfractional parameter estimationinter-path interferenceMore Related Videos
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