Calderbank, AR; Fishburn, PC, *Normalized second moment of the binary lattice determined by a convolutional code*,
Proceedings of the 1993 IEEE International Symposium on Information Theory
(1993),
pp. 137- .
**Abstract:**

*The output of a finite state machine is a collection of codewords that can be searched efficiently to find the optimum codeword with respect to any nonnegative measure that can be calculated on a symbol by symbol basis. Applications involving trellis codes are considered. Although details are given for the convolutional code, the method can be applied to arbitrary codes.*