METHOD AND SYSTEM FOR COMPUTING LOG-LIKELIHOOD RATIOS FOR CODED QUADRATURE AMPLITUDE MODULATED SIGNALS

According to an embodiment of the invention, a method and system is disclosed for determining log-likelihood ratios for a coded set of individual bits (40) of a quadrature amplitude modulation (QAM) codeword. In the method at most two constant values (33,35) may be determined to perform a set of pre...

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Bibliographic Details
Main Authors LUSCHI CARLO, ALLPRESS STEPHEN ALAN, FELIX STEPHEN
Format Patent
LanguageEnglish
Published 24.08.2007
Subjects
ELECTRIC COMMUNICATION TECHNIQUE
ELECTRICITY
MULTIPLEX COMMUNICATION
TRANSMISSION
TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHICCOMMUNICATION
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Summary:According to an embodiment of the invention, a method and system is disclosed for determining log-likelihood ratios for a coded set of individual bits (40) of a quadrature amplitude modulation (QAM) codeword. In the method at most two constant values (33,35) may be determined to perform a set of predetermined functions, the output of each of function is based on the constant values and at least one received component corresponding to the code word, to determine log-likelihood ratios (37) for each individual bit of the set of individual bits of the codeword. The QAM codeword may correspond to at least a portion of a signal of a wireless device, such as a mobile third-generation device operating according to a Wideband Code-Division Multiple Access (WCDMA) standard.
Bibliography:Application Number: KR20077010397