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Method and Apparatus For Transmitting a Signal Within a Predetermined Spectral Mask

  • US 20100203854A1
  • Filed: 02/08/2010
  • Published: 08/12/2010
  • Est. Priority Date: 02/10/2009
  • Status: Active Grant
First Claim
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1. A transmitting apparatus for transmitting a signal within a predetermined spectral mask defining a range of power density limits across a frequency range, the apparatus comprising:

  • a first signal source for providing a first input signal;

    a filter coupled to the first signal source for low-pass filtering the first input signal to produce a first filtered signal, the filter being selectively operable in a first mode in which the first input signal is filtered within a narrower bandwidth and in a second mode in which the first input signal is filtered within a broader bandwidth;

    a modulator coupled to the filter for modulating the first filtered signal to produce a first modulated signal;

    a transmitter, coupled to the modulator, for transmitting the first modulated signal at a required power level as a transmitted signal having a spectral envelope; and

    a controller for controlling operation of the filter depending on the required power level such that the first input signal is so filtered in the first mode when the required power level is higher that the spectral envelope of the transmitted signal is within the spectral mask, and is so filtered in the second mode when the required power level is lower that the spectral envelope of the transmitted signal remains within the spectral mask.

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