The effects of channel fading of multitone interference on the performance of multiple hops per symbol fast frequency-hopped (FFH), M-ary orthogonal frequency-shift keyed (MFSK) noncoherent systems are analytically investigated. The multiple equal-power interference tones are assumed to correspond to some of the possible FFH/M-ary orthogonal signaling tones. It is also assumed that the channel fading characteristics are independent for the signal tone and interference tone. We evaluate how the effect of the multitone interference fading on system performance is changed by various parameters, such as the number of interference tones, the number of hops per symbol and the modulation order. In addition, our numerical results indicate that the larger number of hops per symbol makes the system performance more sensitive to the fading of multitone interference.
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