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An Improved Orthogonal Matching Pursuit Algorithm for CS-Based Channel Estimation.

Lu Si1,2, Weizhang Xu1,2, Xinle Yu1,2

  • 1State Key Laboratory of Media Convergence & Communication, Communication University of China, Beijing 100024, China.

Sensors (Basel, Switzerland)
|December 9, 2023
PubMed
Summary
This summary is machine-generated.

Improved orthogonal matching pursuit (OMP) algorithms enhance wireless channel estimation in single-carrier frequency domain equalization (SC-FDE) systems. This method boosts communication reliability by refining channel path gain calculations for better performance.

Keywords:
Cramér–Rao lower boundcompressed sensingorthogonal matching pursuitsimultaneous orthogonal matching pursuitsingle-carrier frequency domain equalization

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Area of Science:

  • Electrical Engineering
  • Signal Processing
  • Wireless Communications

Background:

  • Wireless broadband channels exhibit time-domain sparsity.
  • Orthogonal Matching Pursuit (OMP) is used for channel reconstruction, improving performance and reducing reference signal length.
  • Compressed Sensing (CS) based channel estimation is crucial for modern wireless systems.

Purpose of the Study:

  • To propose improved Orthogonal Matching Pursuit (OMP) and Simultaneous Orthogonal Matching Pursuit (SOMP) algorithms for compressed-sensing (CS)-based channel estimation.
  • To enhance channel estimation performance in single-carrier frequency domain equalization (SC-FDE) systems.
  • To improve the reliability and efficiency of wireless communication systems.

Main Methods:

  • Developed improved OMP and SOMP algorithms for CS-based channel estimation.
  • Calculated channel path gain after obtaining path delay and updating observation matrices.
  • Utilized longer observation vectors for more reliable path gain calculation.

Main Results:

  • The proposed algorithms demonstrated superior channel estimation performance compared to conventional methods.
  • The improved methods effectively lower the Cramér-Rao lower bound (CRLB).
  • Enhanced reliability and performance in SC-FDE systems were achieved.

Conclusions:

  • The developed improved OMP and SOMP algorithms offer significant advancements in CS-based channel estimation.
  • The method enhances communication system reliability by improving channel path gain calculation.
  • The approach is applicable to Time-Domain-Synchronous OFDM (TDS-OFDM) and other matching pursuit algorithms.