Trajectory-Aided Maximum-Likelihood Algorithm for Channel Parameter Estimation in Ultra-Wideband Large-Scale Arrays

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Abstract

Millimeter-wave with ultrawide bandwidth available and ability to pack massive number of antennas in a small area is considered the key enabler for future generation communication systems. Accurate understanding and modeling of the ultrawideband propagation channel with large-scale array configuration is essential. In this contribution, a realistic spherical-propagation signal model considering the spatial nonstationarity of path gain across the array elements is proposed. A novel trajectory-aided maximum-likelihood (TAMax) algorithm is proposed to extract propagation parameters from the measured data, since the existing high-resolution propagation parameter estimation algorithms are not applicable due to either prohibitively high computation loads or assumption violations. In the proposed TAMax algorithm, the high-dimensional maximum-likelihood estimation (MLE) problem is first decomposed into a subproblem where delays and amplitudes of multipath components (MPCs) are estimated at individual array elements. A novel transform is then proposed to identify multiple MPC trajectories in the delay-element domain. With interference cancellation and fast initialization obtained in the proposed transform, spherical propagation parameters are finally acquired via joint MLE with significantly decreased searching spaces. Moreover, a measurement campaign conducted at the frequency band of 27-29 GHz using a virtual uniform circular array is introduced, where the proposed TAMax algorithm is applied and validated.

Original languageEnglish
Article number9104014
JournalIEEE Transactions on Antennas and Propagation
Volume68
Issue number10
Pages (from-to)7131-7143
Number of pages13
ISSN0018-926X
DOIs
Publication statusPublished - Oct 2020

Keywords

  • Large-scale array
  • millimeter-wave (mmWave)
  • spatial nonstationarity
  • spherical wave propagation
  • ultrawideband

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