iversity in n = 1 band multitone jamming. Coding Countermeasures (2.76)), it is difficult to make a definite "optimum diversity" comparison with larger values of K. Figure 2.45 addresses the accuracy of the "quasi- worst case" jamming parameter awc derived from the Pb bound of (2.86) and (2.87). Prior to saturation, for smaller values of m, the exact awc fluc- tuates up and down due to the discrete nature of (2.102) (for each inte- ger value of m, awc = kwlm, where kwc is the integer k that maximizes Pb in (2.97)-(2.99) subject to am = k), but the constant quasi-worst case awc = ao (see (2.90) and Table 2.7) is a good average fit to these fluctuations. In the saturation region, for sufficiently large m, both the quasi-worst case and exact parameters satisfy awc = KE,lmMN, (see (2.90) and (2.102)), SO there is total agreement here. We now consider the question of optimum diversity for K > 2. Recall that for K = 1, it was not clear whether to select the local minimum of the Pb versus m curves, or to use a moderately larger value of m m* for which Pb became arbitrarily small (Figure 2.36 and (2.76) and (2.79)). Figure 2.44 shows that although P for K 2 again decreases for suffi- ciently large m in the saturation region, the values of m for which this effect becomes significant are much larger than the initial local minima at Mopt, and are not of interest for realistic implementations. So we will look for the value of m that minimizes Pb for a = awc in the region < 1. For the bound of (2.90) (the relative simplicity of which we should all have a new appreciation for), this implies the restriction Eb/N, Im; the minimum occurs at Bm/Eb/N, = e-1, SO that the performance with "quasi- optimum" diversity is defined by where Mopt ==EE/N = awc=ao (2.104) provided The constraint on Eb/N1 ensures that Mopt 1. Of course, for the solution to be valid, we must verify that Mopt is in the pre-saturation region: S = Be. (2.105) Table 2.7 shows that this constraint is satisfied, and also lists the numerical values of 8 and Yo. Non-Co