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\title{Multipath Parameters Estimation of Near-Field Spatial-Wideband Systems}



\author[1]{Shrayan Das}%
\author[2]{Debarati Sen}%
\author[1]{Emanuele Viterbo}%
\affil[1]{Monash University}%
\affil[2]{Affiliation not available}%


\vspace{-1em}



  
  \date{April 27, 2026}


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\begin{abstract}
This letter proposes a low-complexity, one-snapshot angle, range and
channel gain estimation algorithm for a sparse multipath near-field
spatial-wideband system. With upcoming mm-wave \& sub-THz systems
expected to operate massive antenna arrays, the transmitted wideband
signal is not only sensitive to the propagation delay across the array
aperture but the resulting wavefront is no longer planar. A modified
wideband discrete linear chirp transform (DLCT) is used to estimate the
multipath parameters of such a system. Furthermore, an iterative
neighbourhood search is proposed to acquire super-resolution estimates
of the scatterer locations, path gain and the multipath's arrival angle.
We also show that they are asymptotically optimal approaching their
respective Cramer-Rao bounds.%
\end{abstract}%



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