New Bounds of No-Hit-Zone Frequency-Hopping Sequences with Frequency Shift

In quasi-synchronous FH multiple-access (QS-FHMA) systems, no-hit-zone frequency-hopping sequences (NHZ-FHSs) can offer interference-free FHMA performance. But, outside the (NHZ), Hamming correlation of traditional NHZ-FHZs maybe so large that performance becomes not good. And in high-speed mobile environment, Doppler shift phenomenon will appear. order to ensure FHMA, it is necessary study NHZ-FHSs presence transmission delay and frequency offset. this paper, We derive a lower bound on maximum time-frequency two-dimensional NHZ NHZ-FHSs. The Zeng-Zhou-Liu-Liu particular situation new for zero.