Spectrum re-use employing transfer domain communications systems
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United States of America Patent
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Issued Date -
Mar 30, 2006
app pub date -
Sep 23, 2005
filing date -
Sep 23, 2004
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Abandoned
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Abstract
A system and method for spectrum re-use employing transfer domain communications systems is disclosed. An adaptive waveform technique reconfigures its fundamental modulation waveform depending on the spectral environment. Spectral interference, or other friendly user's presence, is estimated using general spectral estimation techniques. Once the frequency bands containing strong interference or signals of other users are identified, those frequency bands are removed prior to creating a time-domain Fundamental Modulation Waveform (FMW) using the appropriate inverse transform. The data is then modulated with these fandamental modulation waveforms to generate the digitally encoded waveforms. The digitally encoded waveforms representing the transmitted communication symbols do not contain energy at the spectral location of the interference. By repeating the spectral estimation and fundamental modulation waveform generation process, an adaptive waveform is created which adapts to the electromagnetic environment as needed.
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