Patent ID: 6782060
Filing Date: 2004-08-24
Classification: H03M,H04L

Abstract:
A method for generating reliability information (q) for channel decoding in a radio receiver, the reliability information (q) specifying, for a time &mgr;âˆ’Lâ€² at an arbitrary time &mgr; for each data symbol (z) received by the radio receiver via a radio channel, the probability that the received data symbol (z) is one of a first and a second value based on one of a first and a second transmitted value, the method comprising:determining a first path that most probably contains the first value at time &mgr;âˆ’Lâ€² and a second path that most probably contains the second value at time &mgr;âˆ’Lâ€² according to a state model having 2Lâ€² states; calculating metrics for the first path and the second path in dependence on a first group of symbols of the state model present at times &mgr; . . . &mgr;âˆ’Lâ€² and a second group of symbols of the state model present at times &mgr;âˆ’Lâ€²âˆ’1 . . . &mgr;âˆ’L, L corresponding to at least a length of a channel impulse response of the radio channel with L>Lâ€², symbols of the second group comprising values that have been decided before the time &mgr;âˆ’Lâ€² and are identical for all states of the state model; and placing the metrics calculated for the first path and the second path into a relationship with one another.