The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 14, 2006
Filed:
Sep. 08, 2000
Patrick Tortelier, Clichy, FR;
Raphaël Visoz, Iissy-les-Moulineaux, FR;
Patrick Tortelier, Clichy, FR;
Raphaël Visoz, Iissy-les-Moulineaux, FR;
France Telecom, Paris, FR;
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 xby minimizing the quadratic error between the observed symbol Vand the current symbol in the channel output z, the quadratic error being calculated () from the set of observed symbols based on the branch metric of the last transition e(X)→e(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 () 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 () and the sequence of bits is read by backtracking through the successive nodes. The invention is applicable to ATM radio transmission.