We study the Slepian spectral concentration problem for the spherical harmonic-Bessel band-limited functions in general Rᵈ, d≥ 2. In particular, we prove the bimodal distribution of eigenvalues of the concentration operators and give the asymptotic characterization of the Shannon number given a linear relation between the Bessel bandwidth and spherical harmonic bandwidth.
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Xinpeng Huang (2024) studied this question.
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