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Superimposed Perfect Binary Array-Aided Channel Estimation for OTFS Systems.

Zuping Tang1, Hengyou Kong1, Ziyu Wu1

  • 1School of Electronic Information and Communications, Huazhong University of Science and Technology, Wuhan 430074, China.

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Summary
This summary is machine-generated.

This study introduces a new channel estimation method for Orthogonal Time-Frequency Space (OTFS) modulation using superimposed perfect binary arrays (PBA). This approach enhances spectral efficiency (SE) in high-mobility scenarios without needing extra frames.

Keywords:
channel estimationorthogonal time-frequency space modulationperfect binary arraysuperimposed pilot

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Area of Science:

  • Wireless Communications
  • Signal Processing
  • Information Theory

Background:

  • Orthogonal time-frequency space (OTFS) modulation offers superior performance over orthogonal frequency-division multiplexing (OFDM) in high-mobility environments due to enhanced channel estimation.
  • Superimposed pilot (SP)-based channel estimation improves spectral efficiency (SE) compared to embedded pilot (EP) methods, but traditionally requires separate frames for delay-Doppler tap estimation.

Purpose of the Study:

  • To propose a novel, high-SE channel estimation method for OTFS modulation that eliminates the need for additional pilot frames.
  • To improve spectral efficiency in high-mobility wireless communication systems.

Main Methods:

  • A new channel estimation technique is proposed, superimposing perfect binary arrays (PBA) onto data symbols as pilots within the same frame.
  • Channel estimation is performed by leveraging the autocorrelation properties of PBA to identify correlation peaks, extracting both delay-Doppler tap information and complex channel gain.
  • The optimal power ratio for PBA superposition is derived by maximizing the signal-to-interference-plus-noise ratio (SINR) to enhance system SE.

Main Results:

  • The proposed PBA-based superimposed pilot method achieves accurate channel estimation, comparable to existing EP methods.
  • The method significantly improves spectral efficiency (SE) by integrating pilot information within data frames.
  • Optimization of PBA power ratio further enhances the signal-to-interference-plus-noise ratio (SINR).

Conclusions:

  • The novel PBA-based channel estimation method offers a high-SE solution for OTFS modulation in high-mobility scenarios.
  • This approach overcomes the limitations of traditional SP methods by eliminating the need for separate pilot frames.
  • The proposed technique provides a viable alternative for improving wireless communication system performance.