Method and device for carrying out flexible demodulation in...

Pulse or digital communications – Systems using alternating or pulsating current – Plural channels for transmission of a single pulse train

Reexamination Certificate

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C375S341000

Reexamination Certificate

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07974357

ABSTRACT:
This method for carrying out the flexible demodulation of data modulated following an amplitude modulation in quadrature is used in a communications system employing a code division multiple access technique (CDMA) and an optical frequency division multiplexing (OFDM) using non-binary spread codes. The invention includes steps for determining a simplified expression specific to the logarithm of the likelihood ratio.

REFERENCES:
patent: 2008/0215950 (2008-09-01), Shen et al.
patent: 2010/0005363 (2010-01-01), Eroz et al.
patent: 2010/0265865 (2010-10-01), Vijayan et al.
patent: 2010/0284480 (2010-11-01), Jia et al.
patent: 2 866 770 (2005-08-01), None
Stefan Kaiser, “Trade-off between Channel Coding and Spreading in Multi-Carrier CDMA Systems”, 1996 IEEE 4thInternational Symposium on Spread Spectrum Techniques and Applications Proceedings, Sep. 22-25, 1996.
Filippo Tosato & Paola Bisaglia, “Simplified Soft-Output Demapper for Binary Interleaved COFDM with Application to HIPERLAN/2”, 2002 IEEE International Conference on Communications, Apr. 28-May 2, 2002.
International Search Report, Apr. 24, 2007.
PCT Request in French, Sep. 26, 2006.
PCT Written Opinion in French, Apr. 24, 2007.

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