Pulse or digital communications – Transmitters
Reexamination Certificate
2011-08-02
2011-08-02
Fan, Chieh M (Department: 2611)
Pulse or digital communications
Transmitters
C375S259000, C375S260000, C375S286000, C375S299000, C375S306000, C375S307000, C375S316000, C375S347000, C370S206000, C370S207000, C370S208000, C370S209000, C370S210000, C370S211000
Reexamination Certificate
active
07991069
ABSTRACT:
A method for adapting filter cut-off frequencies for the transmission of discrete multitone symbols, where a transmit symbol datastream consisting of discrete multitone symbols is applied to an interpolation device, the transmit symbol datastream is interpolated with a symbol rate in the interpolation device, an interpolated symbol datastream is filtered in a first low-pass filtering device in accordance with a first filter cut-off frequency, which can be predetermined by a first filter cut-off frequency determining device, a digital symbol datastream obtained after a digital-analog conversion, transmission and analog-digital conversion, is filtered at the receiver end in a second low-pass filtering device in accordance with a second filter cut-off frequency, which can be predetermined by a second filter cut-off frequency determining device, in order to provide an equalized symbol datastream, the equalized symbol datastream is decimated in a decimation device and the decimated received symbol datastream consisting of discrete multitone symbols is provided to a multitone receiver device.
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Fan Chieh M
Lantiq Deutschland GmbH
Maginot Moore & Beck
Vlahos Sophia
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