Cross-term compensation power adjustment of embedded auxiliary data in a primary data signal
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United States of America Patent
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Aug 17, 1999
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app pub date -
Feb 25, 1997
filing date -
Feb 25, 1997
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Abstract
An auxiliary data signal is transported with a primary data signal by hiding the auxiliary data signal in the form of colored noise. The colored noise has a spectrum that simulates the spectrum of the primary data signal. By adjusting the gain of individual spread spectrum signal carrier(s) and the power of the colored noise, the auxiliary information stream(s) can be rendered at any desired level below or above an interference threshold in the primary data signal. The power of the colored noise is further compensated to account for a cross-correlation between the primary data signal and the auxiliary data signal to enhance the recovery of the auxiliary data at a decoder.
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