Introduction - If you have any usage issues, please Google them yourself
SOVADEC is an implementation of the soft input soft output Viterbi
algorithm. The algorithm can be called using
DEC = SOVADEC( MSG, LLR, TRELLIS, WIN )
where MSG is the soft input (codeword), LLR is a priori information
per bit about the bits (log likelihood ratios), TRELLIS is the
trellis structure describing the convolutional encoder used to
encode the original information message.