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AssigneeSpidcom Technologies
InventorOlivier Isson
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A method and apparatus to reduce the level of quantification noise when transmission power varies with frequency. Power variation is carried out in the analog domain by filtering a frequency band and attenuating a complementary band in two signal analog-processing paths. More precisely, the method for reducing the quantification noise for transmitting a multi-carrier signal comprises an IFFT conversion step, a digital-to-analog conversion step and an analog-processing step of the signal frequencies on a band having a maximal frequency. Moreover, the analog processing step includes at least two processing paths in parallel to the analog signal, in which: for at least one first path, the signal is filtered so as to retain only the frequencies of a low-frequency band and, in parallel in at least one second path, the signal is subjected to gain, amplification or gain attenuation and, in a final step, the signals from the paths are summed.
A method for reducing quantification noise for transmitting a multi-carrier signal comprising a frequency-time signal transformation step, a Digital-to-Analog conversion step then an analog processing step of the signal frequencies on a band having a maximal frequency, wherein the analog processing step comprises at least two processing paths in parallel to the analog signal, in which:
A device for reducing quantification noise for transmitting a multi-carrier signal comprising an IFFT block having an input coupled to receive a digital signal, a DAC converter having an input coupled to receive the signal at the output of the IFFT block, then at least two paths of an analog processing circuit coupled at the output of the DAC converter, in which one processing path comprising a low pass filter and a path comprising an attenuator gain amplifier, the paths being combined in a summer.
Dependencies are inferred from the claim text.