 E/N, are upperbounds. As a single benchmark, the min- imum Eb/N, required to ensure Pb = 10-5 for any non-adaptive jammer in Table 2.12 is less than 10.38 dB; for Table 2.13, the corresponding require- ment is 19.70 dB (for K = 2, the (63, 31) RS code, with worst case n = 1 band multitone jamming). The performance might be improved for some of the higher order RS codes if reduncancies greater than 64 were used; however, Berlekamp's tabulated values of PO do not extend to this region, and the complexity of high-speed RS coder/decoder implementations increases with redundancy [21, p. 571]. There are some expanded tables of PQ covering a larger range of redundancies, and we will use these later to explore the issue of optimum RS code rates in the context of combined cod- ing and diversity. Table 2.13 Required Eb/N, to achieve P = 10-5 for Reed-Solomon coding with FH/MFSK signals in worst case partial-band noise and n = 1 band multitone jamming, assuming hard decisions on received code symbols. Terminology: Reed-Solomon codes over GF(2°); L = QIK = number of M = 2K-ary channel uses/code symbol; PQ and PK are code and channel symbol error rates, respectively. EIN, dB for Pb = 10-5 Noise Multitone (31,15) 5.88 X 10-2 1.20 X 10-2 18.02 22.36 (63,31) 9.50 X 10-2 1.65 X 10-2 16.56 20.91 (127,63) 1.30 X 10-1 1.97 X 10-2 15.76 20.10 (255,191) 6.51 X 10-2 8.38 X 10-3 17.68 22.02 (15,7) 2.81 X 10-2 1.42 X 10-2 17.22 23.55 (63,31) 9.50 X 10-2 3.27 X 10-2 13.37 19.70 (255, 191) 6.51 X 10-2 1.67 X 10-2 14.46 20.79 (1023, 959) 1.72 X 10-2 3.46 X 10-3 20.32 26.65 (7,3) 9.51 X 10-3 9.51 X 10-3 19.24 27.58 (63,31) 9.50 X 10-2 4.87 X 10-2 11.54 19.88 (511,447) 3.33 X 10-2 1.12 X 10-2 15.43 23.77 (15,7) 2.81 X 10-2 2.81 X 10-2 14.11 24.56 (255, 191) 6.51 X 10-2 3.31 X 10-2 11.35 21.80 (31,15) 5.88 X 10-2 5.88 X 10-2 10.78 23.38 (1023, 959) 1.72 X 10-2 8.64 X 10-3 16.27 28.86 Coding Countermeasures 2.3.2.3 Concatenated Codes Since we have determined that Reed-Solomon (RS) codes alone do not pro- vide sufficient redundancy to produce a