Hierarchical quadrature frequency multiplex signal format and apparatus for transmission and reception thereof
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United States of America Patent
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Jul 8, 1997
Grant Date -
N/A
app pub date -
Mar 15, 1995
filing date -
Mar 15, 1994
priority date (Note) -
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Abstract
A hierarchical quadrature frequency multiplex signal transmission apparatus that produces a plurality of modulated signals in which multiple layers of hierarchical information data are associated with a plurality of hierarchically graded modulation forms. The apparatus also interleaves symbols within a frame of the hierarchical information data in both a time axis and a frequency axis. In addition, the apparatus may differentially encode one of the hierarchically graded modulation forms. Further, the apparatus performs an inverse Fourier transform on the symbols, by associating each of the plurality of hierarchically graded modulation forms with a corresponding predetermined carrier. Also disclosed is an apparatus for receiving the hierarchical quadrature frequency multiplex signal and the format of the hierarchical quadrature frequency multiplex signal.
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