Two constructions of low-hit-zone frequency-hopping sequence sets

<p style='text-indent:20px;'>In this paper, we present two constructions of low-hit-zone frequen-cy-hopping sequence (LHZ FHS) sets. The constructions in this paper generalize the previous constructions based on <inline-formula><tex-math id="M1">\begin{document}$ m $\end{document}</tex-math></inline-formula>-sequences and <inline-formula><tex-math id="M2">\begin{document}$ d $\end{document}</tex-math></inline-formula>-form functions with difference-balanced property, and generate several classes of optimal LHZ FHS sets and LHZ FHS sets with optimal periodic partial Hamming correlation (PPHC).</p>