1[1]J. Hagenarer and P. Hoeher. A Viterbi Algorithm with Soft- Decision Outputs and its Applications. Proceedings of IEEE Globecom Conference. Dallas. TX. USA, November 1989:47.1.1~47.1.7
2[2]Xiao - an Wang and Stephen B. Wicker. A Soft Output Decoding Algorithm for Concatenated System. IEEE Transactions on Information Theory, Vol. IT - 42, March 1996:543 ~ 553