Modified soft output Viterbi algorithm for truncated trellis

Details Modified soft output Viterbi algorithm for truncated trellis Modified soft output Viterbi algorithm for truncated trellis

2007-05-22

2007-05-22

Decady, Albert (Department: 2133)

Error detection/correction and fault detection/recovery

Pulse or data error handling

Digital data error correction

C714S792000, C714S794000, C714S796000, C375S262000, C375S341000

Reexamination Certificate

active

10909220

ABSTRACT:
A method, system and computer program product for obtaining the reliability values for the hard decisions obtained by a Viterbi equalizer in a wireless communication system. A difference parameter is obtained for each Viterbi state at a stage while advancing the Viterbi trellis by the stage. The difference parameter for a Viterbi state at a stage is obtained by subtracting the path metric of the non-surviving path from the path metric of the surviving path for the Viterbi state at the stage. The difference parameter corresponding to the Viterbi state on the ML path at a stage is used as the reliability value for the hard decision obtained at L stages behind the stage, where L is the memory of the Viterbi trellis. A method for obtaining the accurate reliability values for the hard decisions corresponding to the last L stages of a truncated Viterbi trellis is also provided.

REFERENCES:
patent: 5181209 (1993-01-01), Hagenauer
patent: 5319677 (1994-06-01), Kim
patent: 5825832 (1998-10-01), Benedetto
patent: 5905757 (1999-05-01), Kundmann
patent: 5995562 (1999-11-01), Koizumi
patent: 6529559 (2003-03-01), Reshef
patent: 01246418 (2002-10-01), None

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