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:
Apr. 10, 2012
Filed:
Mar. 08, 2005
Dimitri Ktenas, Fontaine, FR;
Mathieu Bouvier Des Noes, Grenoble, FR;
Julien Barletta, Grenoble, FR;
Claire Guyon, La Tronche, FR;
Dimitri Ktenas, Fontaine, FR;
Mathieu Bouvier Des Noes, Grenoble, FR;
Julien Barletta, Grenoble, FR;
Claire Guyon, La Tronche, FR;
Commissariat a l'Energie Atomique, Paris, FR;
Abstract
A method for soft demapping of complex-valued symbols y(k) (k=1, 2, . . . , K) by calculation of a Logarithm of Likelihood Ratio (LogLR) such that: wherein bI,q is the qcoded bit of an in-phase part of a transmitted signal, β is an asymptotic Signal-to-Interference-plus-Noise Ratio, {tilde over (y)}(k) is a standardized symbol associated with y(k), λ is a reference symbol of QAM constellation associated with a M-QAM modulation, SI,q and SI,q are complex plane partitions that bring together, respectively, all reference symbols λ having a '1' at the position (I, q) and all reference symbols λ having a '0' at the position (I, q), a formula similar to LogLR being given for the bit bQ,p, pcoded bit of a quadrature part of the transmitted signal. The method applies to code division multiple access transmission systems.