 
Summary: Viterbi's Impact on the Exploration
of the Solar System
Proof of Optimality of
Orthogonal Codes
First Appearance of
Eb
N0
> ln 2
have made use of the fact that go(p) is concave.
m property b) we have lim,,,, &(p)/p =
C. Thus we obtain
(b) p'l
Fig. 4. Graphical construction of EL(R) from I%(P).
1
ponent E,(R) in the lower bound is a positive
decreasing continuous function of R for all
hical construction of the exponentrate curve
ot of the function E,,(p) is shown in Fig. 4. We
her consideration of the properties of (16)
an upper bound is obtained.
