Pulse or digital communications – Receivers – Particular pulse demodulator or detector
Reexamination Certificate
2007-08-14
2007-08-14
Fan, Chieh M. (Department: 2611)
Pulse or digital communications
Receivers
Particular pulse demodulator or detector
C375S346000, C375S341000, C370S347000, C370S340000
Reexamination Certificate
active
10343137
ABSTRACT:
A baseband digital signal block is processed at an output of a matched filter and at an input of a channel equalizer. This signal is fed to a whitening filter estimated for the block by taking into account interfering signals in the frequency band of the useful signal and in one or more adjacent bands. To this end, an autocorrelation vector, calculated form the block of received signal is projected onto different directions corresponding to predetermined correlation vectors relating to the useful signal, to signals which may be present in the adjacent bands and to the thermal noise. The coefficients of the whitening filter are then derived from the sum of the projected vectors, by taking into account the energy of the useful signal if the latter has not been cancelled prior to the computation of the autocorrelations.
REFERENCES:
patent: 6590932 (2003-07-01), Hui et al.
patent: 6990692 (2006-01-01), Park
patent: 2005/0031061 (2005-02-01), Ojard et al.
patent: 0 801 484 (1997-10-01), None
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Ben Rached Nidham
Dornstetter Jean-Louis
Fan Chieh M.
Nortel Networks Limited
Trop Pruner & Hu P.C.
Zheng Eva
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