egard to multitone jamming, a more signif- icant parameter than p is = Pr{any symbol in an M-ary band is jammed} (2.27) Note that = p in the partial-band noise case. Non-Coherent Frequency-Hopped Systems If in fact it can be shown that the best multitone strategy is to maximize , the jammer should leave at least M - 1 unjammed FH slots between each of its Q available tones (assuming Q < N,/M) SO that no M-ary band can con- tain more than one jamming tone. Of course, this assumes that the FH sys- tem adopts the distinct M-ary band structure of Figure 2.3(a) or (b), with all MFSK symbols occupying adjacent FH slots. Without loss of generality, the multitone analysis below assumes the non-overlapping band structure of Figure 2.3(a) for conceptual convenience, although the results would be unchanged for the arrangement of Figure 2.3(b). The "band multitone" strategy of Figure 2.10 is a generalization of these arguments in which a jammed band contains exactly n jamming tones, under the implied assumption that Qln is an integer. If the jammed bands are selected pseudorandomly, we have (2.28) In previous publications, multitone jamming analyses of non-coherent FH/MFSK systems have restricted the jamming tones to be contiguous in the frequency domain, with uniform spacing R or MR [5, p. 33] and [7]. Indeed, Trumpis refers to this structure as "partial-band multitone jamming" by analogy to the noise jamming case. In our notation, these two schemes fall into the band multitone jamming category with n = 1 or M. If a large is desirable, n = M band multitone jamming should prove to be relatively ineffective since it does not judiciously allocate its available power to the largest number of bands. A simpler strategy that bypasses the assumptions that permit the band multitone implementation is to pseudorandomly distribute the Q jamming tones uniformly over the N available FH slots. Under this so-called "inde- pendent multitone" scheme shown in Figure 2.10, a given FH slot is jammed with probability p, and we assume that other 