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Millimeter Wave Vehicular Channel Emulation: A Framework for Balancing Complexity and Accuracy.

Thomas Blazek1, Erich Zöchmann2,3,4, Christoph F Mecklenbräuker5

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Summary

We developed a sparse representation framework for millimeter wave vehicular channels using c-LASSO. This method efficiently balances accuracy and complexity for channel emulation, crucial for 60 GHz communications.

Keywords:
Akaike information criterionV2X communicationschannel emulationcluster channelsmmwavemodel order estimation

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Area of Science:

  • Electrical Engineering
  • Wireless Communications
  • Signal Processing

Background:

  • Millimeter wave (mmWave) vehicular communication channels present unique propagation challenges.
  • Accurate and efficient channel modeling is essential for reliable vehicular communication systems.

Purpose of the Study:

  • To propose a general framework for sparse representation of mmWave vehicular propagation channels.
  • To balance the trade-off between numerical complexity and accuracy in channel emulation.
  • To evaluate the performance of the proposed framework using synthetic and real-world data.

Main Methods:

  • Utilized the complex Least Absolute Shrinkage and Selection Operator (c-LASSO) for sparse representation.
  • Investigated Fourier basis and subband-projected Fourier basis for channel representation.
  • Developed a sequential estimator for consistent temporal evolution of the channel geometry.

Main Results:

  • The subband-projected Fourier basis demonstrated low complexity and high fidelity for clustered channel impulse responses.
  • The c-LASSO framework effectively balances representation accuracy (mean squared error) with numerical complexity.
  • The sequential estimator ensured consistent temporal dynamics in the channel geometry.

Conclusions:

  • The proposed c-LASSO-based framework provides an efficient method for sparse representation of mmWave vehicular channels.
  • The subband-projected Fourier basis is a suitable choice for high-fidelity, low-complexity channel emulation.
  • The framework's performance was validated with both synthetic data and 60 GHz channel sounding measurements.