Pulse or digital communications – Receivers – Particular pulse demodulator or detector
Reexamination Certificate
2006-03-14
2006-03-14
Chin, Stephen (Department: 2634)
Pulse or digital communications
Receivers
Particular pulse demodulator or detector
C375S262000, C375S265000, C714S792000, C714S794000, C714S796000
Reexamination Certificate
active
07012976
ABSTRACT:
The invention concerns a method for jointly decoding and equalizing a digital signal protected by a trellis-defined code and transmitted though a channel. The method consists in carrying out a maximum likelihood estimate of each current bit xnby minimizing the quadratic error between the observed symbol Vnand the current symbol in the channel output zn, the quadratic error being calculated (1002) from the set of observed symbols based on the branch metric of the last transition en1(X)→en(X) according to the relationship (I); wherein k represents the rank of the coefficients of transverse filtering introduced by the radioelectric channel. The branch metric is calculated by backtracking through the successive states and the error propagating process is inhibited (1003) while backtracking through the successive states by storing at each node S survivors and by updating each survivor at the next time. The final survivor of the least metric is determined (1004) and the sequence of bits is read by backtracking through the successive nodes. The invention is applicable to ATM radio transmission.
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Tortelier Patrick
Visoz Raphaël
Chin Stephen
France Telecom
Gardner & Carton & Douglas LLP
Wang Ted M.
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